TM 9-1290-325-12/1

DEPARTMENT OF THE ARMY TECHNICAL MANUAL

OPERATOR AND ORGANIZATIONAL

MAINTENANCE MANUAL

INCLUDING REPAIR PARTS AND

SPECIAL TOOLS LIST

RADAR CHRONOGRAPH SET: M36, W/E

(1290-861-7105)

This copy is a reprint which includes current

pages from Changes 1 through 5.

HEADQUARTERS, DEPARTMENT OF THE ARMY

JANUARY 1968
WARNING

WE 20780

HIGH VOLTAGE

is used in the operation of this equipment

DEATH ON CONTACT

may result if personnel fail to observe safety precaution

Learn the areas containing high voltage in each piece of equipment

Be careful not to contact high-voltage or 115-volt ac input connections

when installing or operating this equipment

Before working inside the equipment, turn power off and ground points

of high potential before touching them

EXTREMELY DANGEROUS POTENTIALS

exists in the following units:

Klystron

Voltage multiplier

Power supply
C 2, TM 9-1290-325-12/1

WARNING

HIGH VOLTAGE

is used in the operation of this equipment.

DEATH ON CONTACT

may result if personnel fail to observe safety precautions.

Learn the areas containing high voltage

in each piece of equipment.

Be careful not to contact high-voltage or 115-volt ac input connections

when installing or operating this equipment.

Before working inside the equipment, turn power off and ground points of

high potential before touching them.

EXTREMELY DANGEROUS POTENTIALS

exist in the following units:

Klystron

Voltage multiplier

Power supply

WARNING

POTENTIAL RADIATION HAZARD

WHEN RADAR IS ENERGIZED, PERSONNEL SHOULD

NOT BE WITHIN 6 FEET OF THE RADIATING

FEEDHORN (LOCATED IN CENTER OF DISH) IN

THE DIRECTION OF THE TRANSMITTED BEAM.

WE 51652

*TM 9-1290-325-12/1

TECHNICAL MANUAL HEADQUARTERS

DEPARTMENT OF THE ARMY

No. 9-1290-325-12/1 WASHINGTON, DC, 15 January 1968

RADAR CHRONOGRAPH SET: M36, W/E (1290-861-7105)

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

APPENDIX

Section

APPENDIX

Index

1 .

I.

II.

2.

I.

II.

III.

IV.

V.

3.

I.

II.

III.

IV.

V.

4.

I.

II.

A.

B.

I.

II.

III.

IV.

C.

Paragraphs

INTRODUCTION

General ......................................................................... 1-1,1-2

Description and data. ............................................................ 1-3-1-5

OPERATING INSTRUCTIONS

Service upon receipt of materiel ................................................... 2-1-2-3

Controls and instruments ........................................................ 2-4,2-5

Operation under usual conditions ................................................. 2-6 - 2-11

Operation of materiel used in conjunction with radar chronograph M36 .............. 2-12 - 2-17

Operation under unusual conditions ............................................... 2-18 - 2-22

ORGANIZATIONAL MAINTENANCE INSTRUCTIONS

Repair parts, special tools and equipment .......................................... 3-1,3-2

Lubrication and painting ......................................................... 3-3-3-5

Preventive maintenance checks and services ....................................... 3-6,3-7

Troubleshooting ................................................................. 3-8,3-9

Repair of radar chronograph set M36 ............................................. 3-10 - 3-26

SHIPMENT AND LIMITED STORAGE AND DEMOLITION

TO PREVENT ENEMY USE

Shipment and limited storage. .................................................... 4-1-4-3

Demolition of materiel to prevent enemy use ....................................... 4-4,4-5

REFERENCES ..............................................................................

BASIC ISSUE ITEMS LIST AND ITEMS TROOP INSTALLED OR

AUTHORIZED LIST, AND OPERATOR AND ORGANIZATIONAL SUPPORT

(INCLUDING REPAIR PARTS)

Introduction .................................................................... B-1 - B-7

Basic issue items list ........................................................................

Items troop installed or authorized list .........................................................

Repair parts list .............................................................................

MAINTENANCE ALLOCATION CHART .....................................................

.............................................................................................

Page

3

3

17

22

32

42

45

47

47

48

49

53

59

64

A-1

B-1

B-3a

B-3a

B-4

89

97

* This manual supersedes TM 9-1290-325-12/1, 8 October 1963, and TM 9-1290-325-20P, 22 March 1963.

Change 5 1/(2 blank)

C5, TM 9-1290-325-12/1

CHAPTER 1

INTRODUCTION

Section I. GENERAL

1-1. Scope

a. This manual contains instructions for operator

and organizational maintenance of radar chronograph set, M36 and associated equipment

(1290-861-7105).

b. Maintenance responsibilities will apply as

reflected in the maintenance allocation chart and by

allocation of repair parts and special tools.

1-2. Forms, Records, and Reports

a. Authorized Forms. Refer to DA Pam 310-2 and

TM 38-750.

b. Reporting of Equipment Publication Improvements. Report of errors, omissions, and recommendations for improving this publication by the

individual user is encouraged. Reports should be

submitted on DA Form 2028 (Recommended

Changes to Publications) and forwarded direct to

Commander, Frankford Arsenal, ATTN: SARFAMA, Philadelphia, PA. 19137.

c. Materiel Failure Report. Failure of materiel will

be reported in accordance with TM 38-750.

d. Report of Accidents. Injury to personnel or

damage to materiel. Refer to AR 385-40.

Section II. DESCRIPTION AND DATA

1-3. Description of Radar Chronograph Set

M36

a. General Description. Radar chronograph set,

M36 (fig. 1-1) is a portable electronic instrument

which measure weapon projectile velocities ranging

from 70 to 1800 meters per second. The radar

chronograph is designed for mounting on tripod

assembly (fig. 1-2) or on utility truck M151 (fig. 1-3).

Connections for power are made through a power

input connector located on the rear chronograph

panel. Prime power must be supplied from generator

set through cable and reel assembly.

b. Basic Principles. The basic principle upon which

the radar chronograph set M36 (fig. 1-1) operates is

the doppler frequency-shift effect. In essence, the

doppler shift principle states that the frequency of a

wave motion, in this case, radio waves, will appear to

change whenever the observer or the source is in

motion with respect to the other. In this application,

the frequency of the transmitted radar signal is

changed by the motion of the projectile from which it

is reflected. The difference in frequency between the

transmitted and received (echo) signals is measured

and used as a measure of projectile velocity. The

radar chronograph transmits a continuous wave

signal at an X-band frequency of 10,500 mc and

receives an echo signal (returned from a projectile in

flight) having a changed frequency. This frequency

shift (doppler effect) is measured and converted by

means of electronic circuitry to a velocity figure

which is read directly in meters per second. This

reading, which represents the projectile velocity

measured over a small portion of its outer trajectory,

may be converted to muzzle velocity.

3
C4, TM 9-1290-325-12/1

Figure 1-1. Radar chronograph set M36 and associated equipment.

4
C 1, TM 9-1290-325-12/1

On the left hand side of the front section are two

LEAKAGE ADJUSTMENT control knobs numbers 1 and 2 (fig. 1-6). All other operating controls are located on the rear panel. The rear section

contains four plug-in assemblies; the audio amplifier (fig. 1-4), digital display indicator, power

supply and AFC assemblies. The first three of these

are accessible from the rear panel and are held in

place by captive screws. The AFC assembly can be

made accessible by loosening four key lock fasteners and swinging open the hinged front section, For

access to all four assemblies, the complete rear

panel may be pulled out on its guide rails after

loosening ten screws. Air vents with filters are located at the bottom of the rear section for intake

and exhaust of the air circulated by the cooling

fans. The two sections are hinged together to permit opening for access to the waveguide and IF

amplifier assemblies, and to the AFC assembly.

A dovetail-slotted mounting plate is located on top

of the rear section. The dovetail-slotted plate is

used for mounting the sighting telescope XM128.

On both sides of the rear section are trunnion

plates (fig. 1-4) which support the radar chronograph in the mount. An elevation scale is fastened

on the right hand side of the radar chronograph

case.

d. Indicator Digital Display A5. (fig. 1-7).

This assembly is located at the upper left hand

side of the rear cabinet section, The assembly contains 19 plug-in modules. For easy identification

of the divider and decade counter modules, the divider modules (and the adjacent chassis surface)

are painted orange (with the exception of A5A17

which is painted black). Also located on top of

the chassis are two plug-in crystals A5Y1 and

A5Y2 which are used with A5A7 and A5A10

respectively. Located at the end of the chassis is

potentiometer A5R7 which is used for setting the

calibration signal level.

e. Power Supply A6 (fig. 1-8). The power supply assembly is located at the lower left hand side

of the rear case section, and is fastened to the rear

panel by four captive screws. The power supply

circuits are enclosed within a cover which is fastened down by

by means of special extrapolation tables contained

in TM 9-1290-325-12/2.

c. Radar Chronograph. The radar chronograph

(fig. 1-4) is the main component of the radar

chronograph set, M36. Essentially, it consists of a

complete radar transmitter-receiver with special

circuitry for comparing outgoing and incoming

frequencies and for converting the result into

velocity terms on a direct readout display. Transistors are utilized in the electronic circuitry wherever

signal frequencies and power levels permit. This

gives the radar chronograph a high degree of

portability, compactness, coolness of operation,

ruggedness, and stability. The whole unit consists

of six major assemblies contained in a two-section

aluminum case. The smaller front section mounts

the antenna reflector (fig. 1-5) and contains the

waveguide and amplifier-detector (IF) assemblies.

Figure 1-2 Radar chronograph mounted on tripod.

5
C 1, TM 9-1290-325-12/1

Figure 1-3. Radar chronograph mounted on utility truck M151.

means of 16 screws. All electrical connections are

made through connector A6P1 located at the inner

end of the chassis. Two guide pins, located at the

end of the chassis, mate with sockets in the main

chassis frame.

f. Amplifier Audio Frequency A3 (fig. 1-9).

This assembly is located at the upper right hand

side of the rear case section, and is fastened to the

rear panel by means of four captive screws. The

audio amplifier consists of a chassis on which are

mounted nine bandpass filters (A3FL1 through

A3FL9), plug-in module A3A1 (audio amplifier

subassembly), and plug-in module A3A2 (lowpass filter). The audio amplifier subassembly

A3A1 is secured to the chassis by two captive

screws. Plug-in module A3A2 is provided with a

knob for pulling it from its socket, and is secured

by a cover plate which is held down by two screws.

Two guide pins, located at the end of the chassis,

mate with sockets in the main chassis frame.

g. Control Frequency A2 (fig. 1-10). This

assembly is located below the audio frequency

6

amplifier A3. It is made accessible by opening the

hinged front case section of the cabinet. The frequency control (AFC) assembly is fastened to the

side of the main chassis frame by two captive

screws. Test points J1, J2, and J3 are located on

the front surface of the assembly. Adjustment controls marked BAL and AFC are also located here.

At the rear is connector P1 which is used for

making electrical connections to the chronograph

circuitry.

h. Amplifier Detector A4 (fig. 1-11). This

assembly is located in the right hand side of the

front case section. On the panel of this assembly

is the A4M1 internal monitor meter and selector

switch. Electrical connections are made through

connector A4J1 located on the lower left hand

side of the panel, and four coaxial cables which

carry signals to and from the waveguide assembly

A1.

i. Radar Chronograph Mount. The radar

chronograph mount (fig. 1-12) is an all metal

assembly which supports the radar chronograph
C 2, TM 9-1290-325-12/1

Figure 1-4. Radar chronograph.

rigidly while providing for leveling, azimuth,

and elevation adjustments. The assembly consists of two main parts, the lower of which

mounts on the tripod or vehicle mounting

bracket and provides adjustments for leveling,

and the upper yoke-shaped structure which supports the radar chronograph and provides adjustments for azimuth and elevation. The lower

part of the radar chronograph mount has a vialtype bubble level for leveling the base, a drive

knob which turns a sector gem for adjusting

the elevation level of the upper part., and a

lock-handle which locks the elevation level

setting. A travel lock pin is used during transit

to secure the upper and lower sections together.

The upper part of the radar chronograph mount

has an azimuth deflection scale (graduated in

mils of azimuth angle) and a lock-handle for

locking the azimuth setting. On the right arm

of the yoke structure is an elevation lock-handlle and a dial pointer (used with the elevation

scale fastened on the radar chronograph) for

adjusting the elevation of the radar chronograph. Another leveling vial at the bottom of

the yoke is used for leveling the yoke structure.

On the left arm of the yoke structure is a

mounting pin with a lock-handle for securing

the radar chronograph unit to the mount. By

means of these adjustments, scales, and leveling vials, it is possible to aim the radar beam

of the radar chronograph along the expected

projectile trajectory in the same manner as the

weapon is aimed.

j. Telescope Straight XM128. Telescope

straight XM128 (fig. 1-1) is a monocular,

fixed-focus type telescope having an offset in

7
TM 9-1290-325-12/1

Figure 1-5. Radar chronograph antenna.

Figure 1-6. Leakage adjustment controls.

the geometric and optical axis. The telescope

body houses an optical system consisting of an

eyepiece assembly, optical instrument reticle,

erecting prism, objective assembly, and indicator light lens. The objective assembly is installed within a removable cover. A dovetail

groove in the telescope body provides a means

of attaching the illumination portion of instrument light M53. A sunshade is located on

the cover at the objective end. An eyeshield

secured by a retaining ring is attached to the

viewing end of the telescope body. An open

sight is located on the top portion of the telescope body. The shoe assembly on the bottom

of the telescope body acts as the locating surface for the telescope and has a retaining stop

at one end to confine its location. It is used

for optical aiming of the radar chronograph

antenna. The telescope is mounted on the top of

the radar chronograph rear section and sights

through a screen in the parabolic antenna reflector. When not in use, the telescope is stored

in its carrying case M87. Maintenance of telescope XM128 is contained in TM 9-1240-

211-35.

1-4. Description of Associated Equipment

a. Tripod Assembly. The tripod assembly

(fig. 1-13) is an all metal heavy duty assembly

having adjustable legs for a wide range of

height settings. At the base of each leg is a removable hinged foot for use on normal terrain.

For use in sand and mud, a set of larger auxiliary feet is provided. Sand bags may be

placed on these feet for added stability. The

tripod leg length can be varied by means of

telescoping tubular leg extensions. Each leg

extension is provided with calibration numbers

which can be observed through a viewing port

on each leg assembly. The three legs may be

set to different lengths for appropriate leveling on irregular ground. The legs can be secured in position by tightening each of the

three leg clamp hand knobs. The placement

angle for the legs is held by the stay rods, the

guide tube, and the spider assembly. When the

tripod is folded the legs are held in place by

the stay rod latch. The legs are released by

pressing the latch upward. The spider assembly, which controls the position of the leg

frames by means of the hinged stay rods, moves

up or down along the guide tube. The spider

assembly can be fixed at any point on the guide

tube by tightening the spider hand knob. The

top of the tripod consists of a circular leveling

base adapter with three lock handles for securing the radar chronograph mount.

8
C 1, TM 9-1290-325-12/1

Figure 1-7. Indicator digital display A5.

b. Cable and Reel Assembly. The power and

microphone cables of the radar chronograph are

stored on a dual reel assembly (fig. 1-1) when not

in use. The two reels are secured to a mounting

base plate by four key-lock fasteners. The cable

and reel assembly may be used either with or without the mounting base plate. The power cable

assembly on one reel connects to the generator set

and the input jack of the radar chronograph. The

other cable connects to a microphone and the

microphone input jack of the radar chronograph.

This three-conductor cable is also used to connect

the radar test receiver 1290-620-0052 to the radar

chronograph during the optical alinement

operation.

c. Microphone. The microphone (fig. 1-1) is

used to initiate the radar chronograph measurement sequence, is of a dynamic type and is specifically designed for ruggedness to withstand the

shock of the weapon’s muzzle blast. The microphone is placed on the ground approximately 2

feet forward of the chronograph and line perpendicular to the weapon gun tube axis at a distance

of 12 feet from the gun tube axis. The voltage produced by the microphone (upon being struck by

the weapon blast) is used to trigger the counting

circuits of the radar chronograph.

d. Radar Teat Receiver. The test receiver (fig.

1-1) is a wave-guide cavity containing a crystal

diode. The test receiver is mounted on the aiming

post and connected through the special purpose

and microphone cables to the chronograph automatic reliability rater for alining the chronograph

optical system with the radar axis. During this

alinement, the test receiver intercept transmitted

energy from the chronograph which is modulated

at distinct frequencies and then radiated back to

the chronograph.

e. Instrument Light M53. During night operations, the instrument light (fig. 1-14) is used

to illuminate the reticle of telescope XM128.

The instrument light consists princi9
C 1, TM 9-1290-325-12/1

Figure 1-8. Power supply A6.

Figure 1-9. Amplifier audio frequency A3.

10
Figure 1-10. Control frequency A2.

pally of a two-cell battery case, two flashlight

batteries (Signal Corps, type BA-30 dry cell),

a rheostat knob, and two wire leads terminated

in a hand light and a telescope reticle light. For

this application a lamp bracket assembly (fig.

1-1) is screwed onto the reticle light. This

adapter bracket has a dovetail foot which mates

with the dovetail slot on telescope XM128. The

hand light has a pushbutton on-off switch and is

used as a movable light for illuminating the elevation and azimuth scales and the chronograph

panel. The rheostat knob on the battery case

controls the intensity of the reticle light. Rotated fully counterclockwise, it turns the reticle

lamp off.

f. Installation Bracket (Jeep Mounting). This

bracket (fig. 1-1) is used for mounting the radar

chronograph on the utility truck M151. The

bracket is of double angle folded steel construction. An adapter plate similar to that on the

tripod is attached to the top of the bracket by

means of three screws.

g. Adapter Assembly. The adapter assembly

(fig. 1-1) is comprised of a bracket and mounting clamp, Two cable assemblies mounted on the

main bracket are for connecting to generator

output terminals and ground. Connectors of the

cable assemblies, which are mounted on the main

bracket, are for mating with Radar Chronograph power cable connectors. These two connectors are provided in the event two chronographs are to be operated simultaneously. The

C 3, TM 9-1290-325-12/1

necessary mounting hardware is supplied as

components of the adapter assembly.

h. Repair Parts Kit. The repair parts kit (fig.

1-1) contains replacement lamps and fuses (fig.

1-15) for the radar chronograph 10525300 and

the instrument light M53. The lamps and fuses

are contained in a specially designed box which

provides cushioning for each piece. For shipping

and storage the box is immobilized within the

accessory transit case in the special recess provided.

i. Chronograph Automatic Reliability Rater

(CARR). The chronograph automatic reliability

rater (fig. 1-16) test device consists of a small

metal box and a 1-1/2 foot cable. The box contains ten crystal oscillators and two delay circuits. One delay circuit has ten different time delays corresponding to the ten delays available in

the radar chronograph M36. The other delay circuit is a fixed gate and width delay. The CARR

test device is capable of continuously modulating

the test receiver horn at ten distinct frequencies.

It also is capable after any one of ten time delays

of modulating the test receiver horn at any one

of ten frequencies for a period of time that is

consistent with the gate period in the radar

chronograph.

j. Cable Assembly-Special Purpose. The

four-inch special purpose cable (fig. 1-1) is used

for connection between the radar test receiver

when installed on aiming post M1A2, and the

microphone cable of cable and reel assembly. The

microphone cable is then connected to the

“HORN” output of chronograph automatic reliability rater (CARR) for purposes of alining the

chronograph optical system with the radar axis.

k. Identification Plate. An identification plate

is mounted on the right hand side of the case in

the upper rear corner of the radar chronograph

(fig. 1-2). The plate indicates the name of the

equipment, part number, serial number, and date

of inspection after manufacture.

1-5. Tabulated Data

a. Radar Chronograph.

Weight--------------------------------- 112.00 lb.

Height---------------------------- 28.00 in.

Width ------------------------------- 26.00 in.

Depth -------------------------- 26.00 in.

Antenna reflector focal length------------ 7.20 in.

Operating frequency -------------------- 10.50 K mc

b. Radar Chronograph Mount.

Weight ----------------------------- 39.00 lb.

Height ------------------------ 26.00 in.

Width---------------------------- 21.00 in.

Depth ------------------------------ 8.00 in.

11
C 3, TM 9-1290-325-12/1

Figure 1-11. Amplifier detector A4.

12
C 3, TM 9-1290-325-12/1

c. Tripod Assembly.

Weight----------------------------- 47.50 lb.

Maximum height ------------------ 40.00 in.

Minimum height --------------------- 24.75 in.

Maximum leg length------------------ 52.00 in.

Minimum leg length------------------ 31.50 in.

Overall length (folded)----------------- 33.25 in.

One auxiliary foot---------------------- 3.00 lb.

d. Installation Bracket (Jeep Mounting).

Weight ------------------------ 26.00 lb.

Height ---------------------- 15.50 in.

Width--------------------- 13.50 in.

Depth----------------------- 10.00 in.

e. Microphone.

Weight ---------------------- 1.50 lb.

Diameter --------------------- 5.00 in.

Depth--------------------- 3.00 in.

f. Cable and Reel Assembly.

Weight---------------------- 34.50 lb.

Height -------------------- 13.00 in.

Width--------------------------- 10.80 in.

Depth------------------------- 21.20 in.

Power cable length--------------------- 75.00 ft.

Microphone cable length------------------ 50.00 ft.

f.1 Adapter Assembly.

Weight---------------------------- 6.0 lb.

Width ----------------------------- 4.00 in.

Length ------------------------- 10.00 in.

12.1

TM 9-1290-325-12/1

g. Telescope, Straight XM128

(1) Physical characteristics

Width------------------ 7.50 in.

Length ---------------3.00 in.

Height---------------3.375 in.

Weight--------------- 19.50 oz.

(2) Optical characteristics

Power ----------------- 3X

Field of View------------- 13o 20 min.

Exit pupil diameter------- 0.30 in.

Apparent field of view----- 40°

Effective focal length:

Objective------------- 4.123 in.

Eyepiece ----------------- 1.374 in.

h. Container, Reusable

Weight (empty) ---------114.00 lb

Weight (full)------------- 269.00 lb

Length ---------------- 50.00 in.

Width ------------------- 35.00 in.

Height ------------------ 33.125 in.

i. Radar Chronograph Accessories Case

Weight (empty) ------------ 22.50 lb

Weight (full) ----------- 83.00 lb

Length ------------------- 37.25 in.

Width --------------- 19.25 in.

Height ---------------- 13.25 in.

j. Radar Teat Receiver

Weight ----------------- 1.00 lb

Width--------------- 4.50 in.

Height---------------- 5.75 in.

k. Carrying Case M87

Length---------------- 8.875 in.

Width -------------- 5.50 in.

Height ----------------- 5.25 in.

Weight ----------------- 3.00 lb

l. Instrument Light M53

Leads (2)-----------------2 ft, extends to 6 ft

Length (excluding leads)--7.25 in.

Diameter --------------- 1.875 in.

Diameter at rheostat-------- 2.625 in.

Weight ------------------- 0.75 lb (without batteries)

One battery weight-------- 0.15 lb

m. Chronograph Automatic Reliability

Rater

Weight------------------- 5.0 lb

Length----------------- 9.75 in.

Width -------------- 5.50 in.

Height --------------- 4.75 in.

Figure 1-12. Radar chronograph mount.

13
TM 9-1290-325-12/1

Figure 1-13. Tripod assembly.

14
TM 9-1290-325-12/1

Figure 1-14. Instrument light M53.

Figure 1-15. Components of repair parts kit.

15
C 1, TM 9-1290-325-12/1

16

Figure 1-16. Chronograph automatic reliability rater.
C 1, TM 9-1290-325-12/1

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. SERVICE UPON RECEIPT OF MATERIEL

2-1. General

a. When new, used, or reconditioned materiel

is first received by the using organization, it is the

responsibility of the officer in charge to determine

whether the materiel has been properly prepared

for service by the supplying organization and to

be sure it is in condition to perform the function.

b. Make a record of any missing parts, tools,

and equipment, and of any malfunctions. Correct

any deficiencies as quickly as possible.

2-2. Duties

The organizational mechanic performs the inspection to determine whether the materiel has been

properly prepared for service and is in condition

to perform its assigned mission. It is the duty

of the operator to assist the organizational mechanic in the performance of these services.

2-3. Services

Upon receipt of radar chronograph set M36 by a

using organization, the following operations will

be performed:

a. Unpacking.

(1.) Place the radar chronograph accessories

case and reusable container as near the operating

location as possible. Case and container must be

in upright positions for unpacking.

(2) Press relief valve buttons on the case and

container (fig. 2-1) to equalize internal and external air pressures.

(3) Remove security seals from the case and

container latches. Release latches and remove top

sections.

(4) Loosen straps holding upper cradle assembly to lower cradle assembly (fig. 2-2)), in reusable

container, remove upper cradle assembly, and lay

in top section.

Caution: Because of its weight and bulk

it is necessary for three men to lift and position

the chronograph in order to avoid injury to

personnel or damage to equipment.

(5) Using hand grips located on both arms of

the yoke structure of the chronograph mount, together with hands positioned on the rim of the

antenna reflector, carefully lift chronograph from

container.

(6) Remove equipment from accessories case.

(7) Inspect all equipment as indicated in f

below.

b. Setting Up for Tripod Assembly Mounted

Operation.

(1) Unpack chronograph and tripod as indicated in a above.

(2) Place tripod in upright position and release tripod legs from their latched position by

pushing upward against spring pressure on stay

rod latch (fig. 1-13).

(3) Loosen spider assembly knob and spread

legs fully.

(4) Tighten spider assembly knob.

(5) If tripod is to be used on soft ground, attach the three large auxiliary feet by screwing

their threaded mounting studs into the mating

holes in the normal feet and turning until tight.

17
TM 9-1290-325-12/1

Figure 2-1. Radar chronograph accessories case

showing relief.

(6) Extend tripod legs to obtain desired

height by loosening leg clamp knobs and pulling

out each leg until desired number is seen through

viewing port. Retighten knob.

Note. Tripod height will normally be adjusted to

place center of chronograph antenna approximately four

feet from the ground.

(7) Position the three leveling base lock

handles so that they will not interfere with installation of chronograph mount into leveling base

adapter ring.

(8) Place chronograph and mount on top of

tripod and seat the base of mount into leveling

base adapter ring.

Figure 2-2. Radar chronograph with mount in reusable container.

18
(9) Lock mount in place by turning leveling base locking handles on tripod into a radial

position.

(10) Loosen leveling base lock handles and

rotate chronograph mount while observing leveling base vial (fig. 2-3). When the leveling bubble

shows that the vial is on a level line, relock base

lock handles. Recheck the leveling bubble for

level indication.

(11) Loosen azimuth deflection lock knob

(fig. 2-4) on leveling base and rotate chronograph until azimuth deflection dial pointer coincides with white stripe on leveling base. Retighten azimuth deflection lock knob. Withdraw

travel lock pin from leveling base.

(12) Loosen elevation leveling lock handle

(fig. 2-3).

(13) Turn elevation level adjust drive knob

(fig. 2-) until bubble in level on mount yoke arm

is centered.

(14) Lock elevation leveling mechanism by

tightening elevation leveling lock handle. Check

vial bubble to see that it is still centered.

(16) Check leveling by loosing azimuth deflection lock knob and rotating mount 1600 mils

in each direction. The bubble in the mount level

should not move more than one vial division from

center if chronograph is properly leveled.

Figure 2-3. Chronograph mount on tripod, showing

azimuth deflection level adjust controls.

C 3, TM 9-1290-325-12/1

(16) If bubble does shift more than one vial

division repeat (12) through (15) above.

c. Setting Up for Utility Truck M151 Operation.

(1) Remove chronograph with mount and

accessories from transit cases as indicated in a

above.

(2) Install chronograph and mount on utility truck M151 installation bracket by seating

base of mount into leveling base adapter ring.

(fig. 2-5).

NOTE

The M151 truck must have the installation mounting bracket attachment performed as described in TM 9-1290-325-

34.

(3) Lock mount in place by means of leveling

base lock handles.

(4) Place utility truck M151 in desired location, in an approximately level attitude.

(6) Repeat b (10) through (16) above.

d. Installation of Accessories.

(1) Remove telescope XM128 from carrying

case M87 (stowed in radar chronograph accessories case).

(2) Loosen two screws on right side of telescope guide block.

(3) Press down on telescope mount retaining spring on top of chronograph rear section

(fig. 2-6), insert telescope dovetail mount into

mating dovetail recess, release spring, and slide

telescope forward until locked in position.

(3.1) Hold telescope securely against left

side of telescope guide block. Retighten two

screws on right side of telescope guide block.

(4) Remove microphone from accessory

transit case and cable and reel assembly from

stowage.

(5) Reel out sufficient microphone cable to

permit convenient placement of microphone and

connect the end of cable to the microphone and

to the microphone input jack on chronograph

near panel.

(6) Reel out sufficient power cable to connect generator to chronograph input connector.

CAUTION

Prior to connecting adapter assembly

electrical leads to engine generator,

place the generator voltage output se19
C 3, TM 9-1290-325-12/1

Figure 2-4. Chronograph mount on tripod, showing

azimuth deflection level adjust controls.

lector switch (fig. 2-24) to the 120

volt position to prevent damage to the

Radar Chronograph electrical currents.

(7) Install adapter assembly to frame of engine generator 6115-917-7354. Refer to para.

2-14.1 for installation procedure.

e. Lubrication. No lubrication during operation or operator maintenance is required for the

radar chronograph. For lubrication of the generator set, the utility truck, and the cargo trailer,

refer to the appropriate instruction book.

f. Inspection. Upon receipt of the equipment

make a visual inspection for obvious physical

damage, such as, cracked, bent or broken parts,

corrosion, scratches, chips, dents, and missing

knobs or other parts. Detailed inspection of the

materiel is covered in paragraphs 2-6 through

2-8.

g. Storage. Return chronograph and equipment to container and case until ready for operational setup.

20
TM 9-1290-325-12/1

Figure 2-5. Chronograph and mount installed on utility truck M151 bracket

installation.

21
TM 9-1290-325-12/1

Figure 2-6. Installing telescope XM128.

Section II. CONTROLS AND INSTRUMENTS

Digital indicators

Control or instrument

DELAY selector switch

RESET switch

22

2-4. General and instruments provided for the proper operation of the radar chronograph set M36.

This section describes, locates, illustrates

and furnishes the operator with sufficient in- 2-5. Controls and Instruments

formation pertaining to the various controls Refer to table 2-1.

Table 2-1. Control and Instrument

Function Reference

Radar Chronograph External Controls,

Indicators, and Connectors

Set of five digital readout (Nixie) Figure 2-7

tubes used for indicating projectile

velocity in meters per second.

Ten-positions switch for selecting the Figure 2-7

desired delay between firing of the

weapon and the initiation of

velocity measurement.

Resets counter circuits in readiness for Figure 2-7

next counting.
TM 9-1290-325-12/1

Table 2-1. Controls and Instruments - Continued

Control or Instrument

RESET indicator light

MIC SENS (microphone sensitivity)

control

Function

Indicates when the resetting action is

completed.

Controls microphone sensitivity to the

point where circuit will be triggered

by weapon blast but not by extraneous

noise.

CAL 1-OPER-CAL 2 switch Three-position toggle switch, springloaded to the OPER (operate)

position. In CAL 2 position initiates a

self check of chronograph circuit

functions. In CAL 1 position permits

checking the microphone and

associated circuits by tapping the

microphone.

AUDIO output connector Permits headphone monitoring of the

audio frequency signal (not used by

operator).

VELOCITY selector switch

POWER INPUT connector

Permits selection of the one of ten

velocity ranges in which the projectile

velocity is expected to fall. This

increases the chronograph selectivity,

reducing the effects of rendom noise.

115-volt power at 400 cycles per second

is supplied to the chronograph through

this connector.

POWER ON-OFF switch

POWER indicator light

Toggle switch applies power to the

chronograph circuits. Switch is

provided with a guard to prevent

switch from being accidentally turned

off during operation.

Panel light is illuminated when POWER

ON-OFF switch is activated.

Fuse holders

ELAPSED TIME meter

Two fuse holders on the chronograph

rear panel have built-in indicating

lights which show when one of the

power line fuses is defective.

Meter records total chronograph

operating time and displays it in a

digital form.

MICROPHONE input connector

MONITOR SELECTOR switch

Count initiating signal from the

microphone is normally fed to the

chronograph through this connector.

Permits measurements of five different

circuit voltages: LINE, B+, AGCV,

LEAKAGE and SIGNAL.

MONITOR meter Meter indicates whether the five

different circuit voltages are in or out

of the tolerence range. Normal point

for most voltages is indicated by a red

line on the dial face. A tolerance

range is indicated by a green region

on each side of the red line. Dial is

numerically calibrated from 0 to 100.

Reference

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

Figure 2-7

23
TM 9-1290-325-12/1

Table 2-1. Controls and Instruments - Continued

Control or instrument Function

LEAKAGE ADJUSTMENT

controls 1 and 2

These controls are used in combination

and are adjusted to minimize the

amount of transmitted energy

entering the receiving circuits.

When the MONITOR SELECTOR

switch (fig. 2-7) is set to LEAKAGE

and these controls are adjusted

properly, the MONITOR meter (fig.

2-7) will indicate in the green region

of its scale.

Radar Chronograph Internal Controls

and Adjustments

Internal monitor selector switch Switch permits selection of one of six

different currents for application to

the internal monitor meter: AFC

DISC, MOD DRIVE, MOD XTAL 1,

MOD XTAL 2, MXR XTAL 1, and

MXR XTAL 2.

Internal monitor meter Meter gives an indication of the current

selected by the internal monitor

selector switch. The meter is of the

center-zero type, and the scale is

calibrated to 100 microamperes on each

side.

A4R27 Potentiometer is used to set the output

level of the 45 mc oscillator signal.

A4C10 Variable capacitor is used to tune the

primary of the detector transformer,

A4T3.

A4T1 adjustment This adjustment is used to tune the first

IF coil by varying the slug position.

A4T2 adjustment This adjustment is used to tune the

second IF transformer by varying

the slug position.

SAL potentiometer (A2R10) Control is used to adjust the balance

of the differential amplifier.

AFC potentiometer (A2R16) Control is used to adjust the output

level of the 230 KC oscillator.

Radar Chronograph Mount

Controls

Elevation level adjust drive knob The elevation level adjust drive knob

is a hand-operated knob which turns

a worm gear driving a sector gear

to the movable upper part of the

mount assembly. Turning the sector

gear pivots the upper member about

a horizontal axis, thereby tilting the

upper member backward or forward

to establish the initial level position

(read on the upper leveling vial).

Reference

Figure 2-8

Figure 2-8

Figure 2-8

Figure 2-8

Figure 2-8

Figure 2-8

Figure 2-9

Figure 2-9

Figure 2-4

24
C 3, TM 9-1290-325-12/1

Table 2-1. Controls and Instruments-Continued

Control or instrument

Elevation level lock handle

Travel lock pin

Azimuth deflection lock handle

Azimuth scale lock knob

Elevation lock handle

Mounting pin lock handle

Lock handle latch

Leg clamp knobs

Stay rod latch assembly

Spider assembly knob

Leveling base lock handles

Function Reference

This handle turns a steel bolt which is used to clamp

together the upper and lower parts of the mount

after initial leveling adjustment of the upper

member has been made. The bolt passes through

a slot in the upper member into a threaded hole

in the lower member.

Figure 2-3

The travel lock pin is used to lock the movable

parts of the mount in a Axed position during

shipment. It is retained in the locked position

by a spring-loaded catch and held captive by a

chain to avoid loss when not in use.

The deflection lock handle is used to clamp the

arm in position after rotating to the desired

azimuth setting.

Turning of knob clockwise locks the scale in position

after it has been set to the initial zero position.

Lock handle is used to tighten a friction lock which

secures the chronograph in the desired elevation

position.

This handle is used to lock the mounting pin which

engages the left side of the chronograph with

the mount when the handle is in the latched position. Turning the handle to the position shown in

figure 2-10 disengages the lock and permits the

pin to be retracted, releasing the chronograph.

The latch is a spring-loaded locking assembly, used

to hold the mounting pin lock handle in the locked

position. When the latch is not in use it can be

pushed into the mount arm and held in place by

a spring-loaded quick release latch pin.

Tripod Assembly Controls

Used to clamp the sides of the split leg members

against the sliding tubular leg sections to secure

them in the desired extended position.

The stay rod latch is a circular, grooved, springloaded catch, mounted on the lower end of the

guide tube assembly. When the legs are folded,

three catches on the stay rods engage.

This knob located at the center of the spider assembly, is used to clamp the spider assembly

against the guide tube after the legs have been

spread out fully.

These three handles, located on the leveling bar

adapter ring on top of the tripod, are used to

clamp the lower part of the chronograph mount

in the adapter ring. When the handles are turned

to a radial position, the eccentric cam portion of

the inner end overlaps the edge of the bottom

member of the mount and applies sufficient pressure to keep the mount from rotating or pulling

out. The amount of clamping pressure may be

adjusted by tightening down the lock handle retaining nuts on their threaded studs. Before

tightening these handles the lower member of the

mount should be rotated until the lower leveling

vial indicates that the lower mount plane is

level.

Figure 2-4

Figure 2-4

Figure 2-4

Figure 1-12

Figure 2-10

Figure 2-10

Figure 1-13

Figure 1-13

Figure 1-13

Figure 1-13

25
Control or instrument Reference

Aiming post M1A2

Aiming post light M14

Light chest M21

Fire control quadrant M1A1

Aiming circle M2

Adapter assembly

C 3, TM 9-1290-325-12/1

Table 2-1. Controls and Instrument-Continued

Function

Used to support the radar test receiver during the

chronograph optical alinement procedure. During

night operations, it is used to support the aiming

post light M14.

To illuminate the aiming posts for night operation.

Used to store and transport the aiming post light

M14, along with spare batteries and lamps.

Used for the purpose of checking the accuracy of

the elevation scale.

Used during the radar chronograph optical alinement for orienting the radar test receiver and

chronograph antenna.

Installed on engine generator set 6115-917-7354,

permitting use of the generator as a power source

of the radar chronograph.

Figure 2-11

Figure 2-12

Figure 2-13

Figure 2-14

-----------

Figure 2-11.1

26
TM 9-1290-325-12/1

Figure 2-7. Chronograph showing rear panel controls and indicators.

27
C 1, TM 9-1290-325-12/1

Figure 2-8. Chronograph front section-inside view.

28
Figure 2-10. Mounting pin lock handle in unlatched position.

C 3, TM 9-1290-325-12/1

Figure 2-9. Chronograph rear section-inside view.

29
C 3, TM 9-1290-325-12/1

WE 550871

Figure 2-11. Post aiming M1A2 and aiming post cover M401.

30
C 3, TM 9-1290-325-12/1

Figure 2-11.1. Adapter assembly-assembled view.

30.1
C 3, TM 9-1290-325-12/1

[This page intentionally left blank.]

30.2
TM 9-1290-325-12/1

Figure 2-12. Light aiming post M14-installed view

Figure 2-13. Chest light M21.

31
TM 9-1290-325-12/1

Figure 2-14. Quadrant fire control M1A1 and carrying case M82.

Section III. OPERATION UNDER USUAL CONDITIONS

2-6. General

This section contains instructions for the

proper care of the materiel, preparation for

operation, and the operation of the radar

chronograph set M36 under conditions of

moderate temperature and humidity. Every

organization equipped with this chronograph

must thoroughly train its personnel in the procedures for operating this equipment. For operation under unusual conditions see paragraphs 2-18 through 2-22.

2-7. Care in Handling

Radar chronograph set M36 will not stand

abuse. Inaccuracy or malfunctions will result

from mistreatment. Any instrument which cannot be adjusted or corrected by the authorized

procedure must be brought to the attention of

organizational maintenance personnel for necessary repairs. Adjustments other than those

32

expressly authorized will not be performed by

the operator.

a Unnecessary turning of screws or other

parts not incident to the use of the instrument

is forbidden.

b. Stops are provided on instruments to limit the travel of the moving parts. Do not attempt to force the rotation of any knob beyond

the stop limit.

c. Keep the instrument as clean and dry as

possible. If the radar chronograph set is wet,

dry it carefully.

d. When not in use, keep the equipment

covered and protected from dust and moisture.

e. Do not point the telescope XM128 directly at the sun as the heat of the focused ray may

damage optical elements.

f. Keep all exposed surfaces of telescope

XM128 clean and dry to prevent corrosion

and/or etching of the optical elements.
C 3, TM 9-1290-325-12/1

2-8. Preparation for Use

a. General. Before using the chronograph, the

operator should ascertain that the optical and

radar axis alinement has been checked using the

radar test receiver (para 2-14) and that the

elevation calibration has been checked using the

fire control quadrant (para 2-17). If the optical

and radar axes are improperly alined or if the

elevation scale is misadjusted, the chronograph

aiming will be seriously hindered. Before actual

operation the operator should also perform

the preoperating checks and adjustments indicated in paragraph 2-14. The chronograph must

be positioned so that when it is properly aimed,

the predicted projectile trajectory will pass

through the conical radar beam at the desired

point. The aiming system of the chronograph

must also correlated with that of the weapon to

facilitate rapid aiming. The chronograph is located, prior to orientation, to the right or left of

the weapon with its vertical (azimuth rotational

axis) axis and the gun trunnion axis lying approximately on the same vertical plane. In this

position the vertical axis of the chronograph

should be at a distance of between 8 and 10 feet

(no greater than 10 feet) from the weapon gun

bore axis. The distance between any outer surface

of the chronograph and weapon should be no

less than 1 foot. The microphone is placed on the

ground approximately 2 feet forward of the

chronograph on a line perpendicular to the weapon gun tube axis at a distance of 12 feet from

the gun tube axis.

NOTE

When the chronograph is jeep-mounted,

it may be necessary to place the microphone on the windshield (windshield

lowered) or hood of the jeep to obtain

proper microphone location. The microphone should not be placed beneath the

jeep.

b. Setting Up for Operation. Set up for operation as indicated in paragraph 2-3b and 2-3c. In

addition, place generator set near equipment so

that adapter assembly can be installed and power

cable can be connected.

2-9. Operational Checks and Adjustments

Before operating the radar chronograph and

chronograph automatic reliability rater certain

procedures are performed to assure that the system will function properly. These procedures

include checking the input voltage, leveling the

mount, tuning the leakage tuner cavity to obtain

minimum leakage of signal from the transmitter

to the receiver, checking that AGC voltage is

normal, and checking the calibration of the

counting and indicating circuits.

33
C 3, TM 9-1290-325-12/1

Figure 2-15 is rescinded.

34
C 3, TM 9-1290-325-12/1

a. Radar Chronograph.

(1) Start generator engine and adjust generator for an output of 115 volts at 400 cycles

per second.

(2) Set chronograph POWER switch (fig.

2-7) to ON and note that power lamp lights and

blowers operate. Allow a minimum warmup period of five minutes before making further adjustments.

NOTE

Operation under unusual temperature

conditions may require a longer warmup period.

(3) Set chronograph MONITOR SELECTOR switch (fig. 2-7) to LINE position and then

to B+ position, noting that in both positions the

meter needle falls close to red line (70) in the

middle of the green region (A, fig. 2-16).

(4) Set chronograph MONITOR SELECTOR switch (fig. 2-7) to LEAKAGE position.

(6) Adjust LEAKAGE ADJUSTMENT 1

and LEAKAGE ADJUSTMENT 2 controls (fig.

1-6), in combination to obtain a maximum indication (optimum tuning or minimum leakage)

on MONITOR meter (A, fig. 2-16) (should be

near red’ line in center of green region).

A. READING IN THE LINE, B+, LEAKAGE, AND THE AGC V

POSITION OF THE MONITOR SELECTOR

(6) Set MONITOR SELECTOR switch

(fig. 2-7) to AGCV position and set VELOCITY

SELECTOR switch (fig. 2-7) to the lowest

range (70-325). AGC voltage reading on MONITOR meter (A, fig. 2-16) should be near red

line.

(7) Set MONITOR SELECTOR switch

(fig. 2-7) to SIGNAL Position. Check that

the MONITOR meter reading is less than 20 (providing another indication that the leakage signal

is properly reduced).

(8) If reading is more than 20 (B, fig. 2-

16) detune slightly and repeat (4) through (7)

above.

NOTE

Because leakage signal level will be influenced by external reflections, any

change in position of chronograph of

the weapon may cause the signal level

to change, affecting receiver sensitivity.

For best results (4) through (7) above

should be performed after any change

in position or aiming, and periodically

during extended periods of operation.

(9) Check function of RESET circuits by

depressing RESET switch and noting that REB. READING IN THE SIGNAL POSITION OF THE

MONITOR SELECTOR

WE 23396

Figure 2-16. Monitor meter readings.

35
C 3, TM 9-1290-325-12/1

SET lamp lights and digital indicators (fig. 2-7)

show 0000.0.

ing by setting VELOCITY selector switch (fig.

2-7) to 925-1150 position.

(10) Set up for anticipated calibrating read-

(11) Momentarily place CAL 1-OPER-CAL

2 switch (fig. 2-7) in CAL 2 position and note

that digital indicators read between 1070.0 and

1070.7 and that MONITOR meter needle is deflected into the green region (between 80 and

90).

(12) Depress RESET switch (fig. 2-7) and

note that RESET lamp lights and digital indicators read 0000.0.

(13) Momentarily place CAL 1-OPER-CAL

switch (fig. 2-7) in CAL 1 position and at the

same time tap microphone sharply. Note that

digital indicators read between 1070.0 and 1070.7

and that MONITOR meter needle is deflected

into the green band. (This checks the microphone and associated circuitry.)

b. Chronograph Automatic Reliability Rater

(CARR)-Pre-Operational Instructions and Setup.

(1) Mount chronograph on tripod.

(2) Install radar test receiver on aiming post

(fig. 2-17) so that center of test receiver will be

at least four feet from ground. Wrap a piece of

colored tape 91⁄2 inches from center of test receiver (horn) on aiming post.

(3) Check to insure that dipole feed is located in the geometric center of the antenna

dish by measuring from the outer edge of rivets

in the antenna dish to the front edge of the white

teflon cover on the dipole. This distance should

be 91⁄4 inch ± 1/l6 inch. If the measurement is out

of tolerance, notify direct or general support

maintenance for corrective action.

(4) Set aiming post in the ground at a distance of 10 feet to 50 feet in front of chronoFigure 2-17. Radar test receiver mounted on aiming

post M1A2.

graph. Make certain that the test receiver is in

line with diople feed in center of antenna dish.

(5) Install CARR simulator as shown in

figure 2-18 on the mounting nuts located on the

right hand side of chronograph.

36
C 1, TM 9-1290-325-12/1

NOTE: THE TELESCOPE LINE OF SIGHT IS AIMED AT THE TAPE (LOCATED AT 9-1/2 INCHES ABOVE THE CENTER OF THE HORN) OF THE

AIMING POST. THE HORN IS ABOUT FOUR FEET ABOVE THE GROUND.

WE 23432

Figure 2-18. Setup for alinement of radar chronograph optical system.

(6) Reel out sufficient microphone cable to

connect, test receiver to CARR simulator HORN

OUTPUT CONNECTOR.

(7) Connect jumper cable ends (fig. 1-16)

to MICROPHONE input connector (fig. 2-7) and

CARR simulator CHRONOGRAPH INPUT

CONNECTOR.

(8) Turn on chronograph and prepare for

normal operation.

c. Chronograph Automatic Reliability Rater

(CARR) Optical Alinement Check.

(1) Set the toggle switch on the CARR simulator to the METER position.

(2) Adjust deflection and elevation settings

of chronograph for maximum indication on

MONITOR meter (fig. 1-16) of CARR simulator.

Lock the chronograph in position of maximum

meter indication.

(3) While sighting through XM128 telescope,

adjust the screws in telescope base (fig. 2-19) until

the horizontal cross-hair is on the 91⁄2-inch tape

mark and the vertical cross-hair is in the center of

the test receiver as shown in figure 2-20.

Note. Azimuth adjustment screws must be loosened to

permit elevation adjustment of telescope mount.

(4) Observe that the sight pattern is in the

position of maximum meter indication on the

CARR simulator MONITOR METER (fig. 1-16).

(5) If the change in the sight pattern is not

correct within ±5 mils, repeat 2 through 4 above.

d. Chronograph Automatic Reliability Rater

(CARR) Operational Check Procedure.

(1) Set the toggle switch on the CARR simulator to the OFF position.

(2) Set, the DELAY selector switch on the

CARR simulator to CONT.

(3) Place the VELOCITY selector switch on

the CARR simulator and the Radar Chronograph

M36 to the 70-325 position. Set, the radar chronograph M36 MIC SENS control to 10.

(4) Sight through the XM128 telescope and

verify that the sight, picture is as shown in figure

2-20.

37
C 1, TM 9-1290-325-12/1

Figure 2-19. Telescope mount adjusting screws.

(5) Set MONITOR SELECTOR switch

(fig. 2-7) to SIGNAL position and adjust LEAKAGE controls for a MONITOR meter reading of

less than 20. It may be necessary to readjust the

LEAKAGE controls so that the LEAKAGE position reads in the green band while the SIGNAL

position reads less than 20.

(6) Set toggle switch (fig. 1-16) to OSC

position.

(7) MONITOR meter (fig. 2-7) should indicate a SIGNAL reading in green band or higher.

(8) Set DELAY selector switch (fig 2-7) to

1 position and depress RESET switch. RESET

lamp should light and digital indicators show

0000.0.

(9) Depress START button (fig. 1-16). RESET lamp should extinguish and digital indicators should show the value within the tolerance

indicated on cover decal (fig. 1-16).

(10) Sequence the VELOCITY selector

switch ranges of radar chronograph and CARR

Figure 2-20. Telescope reticle cross-hairs alined with

test receiver.

simulator through the remaining positions keeping

them in coincidence. Depress RESET switch (fig.

2-7) and START button (fig. 1-16) at each velocity position and verify digital indicators show the

value within the tolerance indicated on the cover

decal (fig. 1-16).

(11) Set VELOCITY selector switch of the

radar chronograph (fig. 2-7) and CARR simulator (fig. 1-16) to CAL position. Sequence the

CARR and CHRONOGRAPH delay switches,

through the settings shown in table 2-2. Verify

that the readout of the display indicators is as

shown in table 2-2.

(12) Set MIC SENS control (fig 2-7) to position 5. Depress RESET switch and note that RESET lamp lights and digital indicators read

00000.0.

(13) Depress START button (fig. 1-16).

RESET lamp should extinguish and digital indicators should show 1070 within the tolerance indicated on cover decal (fig. 1-16).

38
Radar chronograph

delay setting

1

2

2

2

8

4

4

4

5

6

6

6

7

8

8

8

9

10

10

Table 2-2. Delay Settings

CARR Delay

1

1

2

3

3

3

4

5

5

5

6

7

7

7

8

9

9

9

10

Digital display indicator reading

(MPS)

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

INCORRECT

1070

2-10. Correlation of Chronograph with

Weapon

In order to aim the radar beam of the

chronograph so that it intercepts the expected

projectile trajectory at the desired point (fig.

2-21), and to permit quick readjustment of the

chronograph aim with any change in the

weapon aim by simply following the fire commands issued for the weapon, it is necessary

to correlate the weapon and chronograph aiming systems before actual operation.

a. Common Aiming Point Procedure.

(1) With the weapon in the initial direction of lay and the panoramic

telescope referred to the aiming point

note the referred deflection.

(2) Check that the chronograph is

leveled by means of leveling vials on

the mount yoke and leveling base.

(3) Aim weapon panoramic telescope at

an aiming point as specified in the appropriate weapon manual.

(4) Read azimuth deflection on weapon

panoramic telescope. Record this

reading only.

(5) Release the azimuth deflection lock

handle.

(6) Sight through telescope XM128 (on

the chronograph) at the common aiming point (fig. 2-22).

TM 9-1290-325-12/1

(7) Tighten the azimuth deflection lock

handle.

(8) Release the azimuth scale lock knob.

(9) Rotate the azimuth deflection scale to

0 .

(10) Tighten the azimuth scale lock knob.

(11) Release the azimuth deflection lock

handle.

(12) Rotate the yoke until the azimuth deflection scale indicates the same reading as that of the weapon panoramic

telescope in (4) above.

(13) Tighten the azimuth deflection lock

handle.

(14) Release the azimuth scale lock knob

and rotate deflection scale to the

reading noted in (1) above.

(15) Tighten the azimuth scale lock knob.

(16) Chronograph is now optically alined

with axis of gun tube.

(17) Check weapon elevation angle.

(18) With chronograph still aimed at common aiming point, check that elevation reading of chronograph is the

same as that of the weapon.

(19) If elevation readings on weapon and

chronograph do not agree, loosen

chronograph elevation dial pointer

adjustment screws (fig. 2-23), adjust pointer for agreement, and retighten dial pointer adjustment

screws.

(20) Chronograph is now optically alined

with axis of gun tube.

(21) Release the azimuth scale lock knob.

(22) Rotate azimuth scale to same base deflection used by gunner.

(23) Tighten the azimuth scale lock knob.

(24) The M36 chronograph is now ready

to follow fire commands given to

gunner.

b. Reciprocal Laying Procedure.

(1) With the weapon in the initial direction of lay and the panoramic telescope referred to the aiming point

note the referred deflection.

(2) Check that the chronograph is leveled

by means of leveling vials on the

mount yoke and leveling base.

39
TM 9-1290-325-12/1

Figure 2-21. Diagram of projectile trajectory and radar beam.

Figure 2-22. Diagram of common aiming point method.

(3) Aim weapon panoramic telescope to (5) Mutually adjust chronograph and

chronograph telescope XM128. panoramic telescope until the vertical

(4) Release chronograph deflection and hair of each telescope is centered on

elevation locking handles and move the front lens of the other. Record

chronograph to direct telescope XM- the deflection setting of the pano128 at panoramic telescope. ramic telescope.

40
Figure 2-23. Elevation scale and dial pointer

adjustment screws.

(6) Tighten chronograph deflection and elevation locking handles.

(7) Release chronograph azimuth scale lock

knob (fig. 2-4) and rotate chronograph deflection

scale to 0.

C 3, TM 9-1290-325-12/1

(8) Tighten chronograph azimuth scale

lock knob. Loosen deflection lock handle.

(9) Rotate the yoke until the azimuth deflection scale indicates the same reading as that

of the weapon panoramic telescope in (5) above.

(10) Releast chronograph azimuth scale lock

knob and rotate deflection scale to the reading

noted in (1) above.

(11) Tighten chronograph azimuth deflection lock handle.

(12) Return weapon panoramic telescope to

the deflection setting noted in (1) above. The

chronograph deflection scale is now set to the

same common deflection as that of the weapon

and can track weapon deflection by following

fire commands.

(13) Release chronograph elevation locking

handle and rotate the chronograph in the yoke

until chronograph elevation agrees with that of

weapon.

(14) Complete aiming procedure by retightening elevation lock handle.

c. Aiming Circle Method.

(1) Check that the chronograph is leveled

by means of leveling vials on the mount yoke and

leveling base.

(2) Mutually adjust chronograph and aiming circle until the vertical hair of each telescope

is centered on the front lens of the other. Record

the deflection setting of the aiming circle.

(3) Chronograph operator records reading

from aiming circle.

(4) Tighten the azimuth deflection lock

handle.

(5) Release the azimuth scale lock knob.

(6) Rotate azimuth deflection scale to 0.

(7) Tighten the azimuth scale lock knob.

(8) Release the azimuth deflection lock handle.

(9) Rotate the yoke until the azimuth deflection scale indicates the same azimuth angle

recorded in (3) above.

(10) Tighten the azimuth deflection lock

handle.

(11) Release the azimuth scale lock knob.

(12) Rotate azimuth scale and set it on the

weapon referred deflection.

(13) Tighten the azimuth scale lock knob.

(14) The chronograph is now ready to follow

fire commands given to gunner.

41
C 3, TM 9-1290-325-12/1

2-11. Operation

Before operation, observe WARNING of POTENTIAL RADIATION HAZARD, cited below.

Check that all the required preliminary steps

given in paragraph 2-9 have been performed,

then proceed as follows:

WARNING

POTENTIAL RADIATION HAZARD

When radar is energized, personnel

should not be within 6 feet of the radiating feedhorn (located in the center of

dish) in the direction of the transmitted

beam.

a. Set chronograph MIC SENS control (fig.

2-7) to 8. Check RESET lamp. If lamp goes out

because of extraneous noise, reduce microphone

sensitivity as required.

b. Set chronograph DELAY selector switch to

delay position 3.

c. Set chronograph VELOCITY selector

switch to the velocity range required for the particular weapon and charge used (see extrapolation table).

d. Set MONITOR SELECTOR to SIGNAL position. The chronograph is now ready to operate.

e. Notify gunner that chronograph is ready

for operation.

f. As weapon fires, note that MONITOR meter

needle is deflected, that RESET lamp goes out,

and that digital indicator reading changes. Record final reading of digital indicators (this reading may be converted later to muzzle velocity by

means of extrapolation table),

g. Momentarily depress RESET switch to

place chronograph in readiness for next round.

Check that RESET lamp lights and digital indicator shows 0000.0.

h. Listen for fire commands between rounds;

make azimuth and elevation changes as required.

i. When operation is completed, turn off power

at chronograph, and turn off generator.

j. Disconnect and stow all chronograph set

components.

k. Disconnect the adapter assembly 1290-181-

5303 from the generator set. The adapter assembly should be returned with the radar chronograph set, M36 when the generator is separated

from the system.

Section IV. OPERATION OF MATERIEL USED IN CONJUNCTION

WITH RADAR CHRONOGRAPH SET M36

2-12. General

This section contains description and instructions for the setup and operation of the materiel

used in conjunction with the radar chronograph

set M36. This materiel includes generator set,

utility truck 2320-542-4783 and cargo trailer

2330-738-9509. Instructions are also given for the

use of fire control quadrant M1A1, 1290-719-

7156 and for the use of radar test receiver and

chronograph automatic reliability rater.

2-13. Chronograph Automatic Reliability

Rater (CARR)

The basic use for which the CARR simulator is

utilized is a field system tester for radar chronograph M36. The CARR simulator is a ten-crystal

oscillator, two monostable flip-flops, and a 500

microampere dc meter. Accessory equipment to

the simulator is a 11⁄2-foot three-wire jumper

cable. The simulator has slots (fig. 1-16) designed for mounting on chronograph. The radar

chronograph transmits a continuous wave signal

at an X-band frequency of 10,500 mc. This en42

ergy is intercepted by the crystal diode in the

radar test receiver (fig. 1-1). The CARR simulator modulates this intercepted energy at any

one of ten crystal controlled frequencies. This

modulated energy is reflected back to the receiver

section of the chronograph where it is processed

for amplification, counting, and display. In the

continuous mode of operation when the START

button (figs. 1-16) is depressed on the simulator,

a start trigger is internally generated in the

CARR simulator and sent through the jumper

cable to the chronograph. This trigger initiates

the gate timing sequence in the chronograph.

When the counting gate opens in the chronograph the reflected modulated RF energy from

the radar test receiver is counted for one gate

period (42.8 msec) and displayed on the digital

indicators (fig. 2-7). For each selected frequency

on the CARR simulator, there is a distinct readout on the digital indicators. In the gated mode of

operation when the START button is depressed

on the CARR simulator, a start trigger is internally generated in the CARR simulator and

sent through the jumper cable to the chrono-
generated start trigger also initiates the internal

gate timing sequence in the CARR simulator.

The simulator gates out a burst of crystal controlled modulating signal to the radar test receiver. When the counting gate in the chronograph coincides with the gated out signal from

the CARR simulator the correct readout is displayed on the nixie tubes of the digital display.

Conversely, if the gates do not coincide, the readout on the digital display is incorrect. The 500

micro-amp dc meter is utilized in alining the

‘telescope XM128 of the chronograph with the

radar beam. This is accomplished by aiming the

radar beam at the radar test receiver. The crystal diode in the test receiver rectifies the intercepted radar energy and the amount of rectified

current is indicated on the meter mounted in the

CARR simulator. With a maximum current indication on the meter, the telescope is positioned

so that the cross-hairs in the telescope pattern

are properly alined on the test receiver. This completes the alinement of the radar beam with the

telescope.

graph. This start trigger initiates the gate timing

sequence in the chronograph and the internally

2-14. Optical Alinement Procedure Using

Radar Test Receiver and Chronograph

Automatic Reliability Rater (CARR)

Optical alinement checks should be performed at

regular monthly intervals or when troubleshooting indicates misalinement between the telescope

XM128 line of sight and the longitudinal axis of

the radar beam. The check should be performed

in a flat, open surface where there are no reflecting surfaces within 200 feet in front of the

chronograph antenna. The center of the reflector

should be at least four feet above the ground to

minimize ground reflections.

a. Utility Truck M151. This 1/4 ton, 4 x 4

utility truck is designed as a general purpose

personnel or cargo-type carrier for use over all

types of roads as well as cross-country terrain,

and in all weather conditions. It will ford hard

bottom water crossings to a depth of twenty-one

inches. The vehicle is powered by a four-cylinder

overhead valve, in-line, liquid cooled, gasoline

engine, located forward of the passenger compartment under the hood, A four-speed conventional type synchro-mesh transmission with

transfer case transmits power to the front and

rear axles. Operator’s maintenance is contained

in TM 9-2320-218-10.

b. Cargo Trailer M100. This vehicle is a twowheel general purpose cargo carrier designed to

C 3, TM 9-1290-325-12/1

carry a maximum load of 500 pounds cross-country. The body and frame are one piece welded

construction. The body is water tight and will

float the trailer and a 500-pound load in fording

operations. Two drain valves are- provided, one in

the front, and one in the rear of the floor. The

trailer is equipped with two tail lights which are

operated from the towing vehicle. An inter-vehicular cable is provided for connecting the

trailer electrical system with that of the towing

vehicle. This cable is stowed in the storage box

mounted on the left front of the body. An “A”

frame drawbar is bolted to the frame side members. It provides for towing connections and for

a support leg. The support leg is retractable and

is used to keep the trailer upright when the

trailer is not connected to a towing vehicle. A

canvas cover is provided for covering the trailer

body. Operator’s maintenance is contained in TM

9-871A.

c. Generator Set HF-0.5 MD. The generator

set (fig. 2-24) is used to power the chronograph

set operation. The generator is driven directly

from the model 1A0 8-111 engine. It is a 0.5

kilowatt, 120 or 240 volt, 400-cycle, a.c. single

phase, generator, fully radio interference suppressed and fungus-proofed.

d. Engine. The Military Standard Engine

(Model 1A0 8-111) is a 4-stroke cycle, overhead

valve, air-cooled engine. It is fully radio interference-suppressed and fungus-proofed. This is a

one-cylinder engine which develops 1-1/2 horsepower at 3,600 rpm.

2-14.1 Installation of Adapter Assembly

1290-181-5303

(fig. 2-24.1)

CAUTION

Prior to connecting adapter assembly

electrical leads to engine generator,

place the generator voltage output selector switch (fig. 2-24) to the 120 volt

position to prevent damage to the Radar

Chronograph electrical circuits.

a. Install bracket 10559745 (fig. 2-24.1) on

frame of generator set 6115-917-7354 as shown

installed in (fig. 2-24).

b. Install clamp 10559744 and secure with two

screws 5305-579-5238, two flat washers 5310-

582-5677, two lock washers 5310-543-2740 and

two nuts 5310-903-5966 (fig. 2-24.1).

c. Connect the adapter assembly electrical

wire leads to engine generator output as follows :

43
C 3, TM 9-1290-325-12/1

(1) Connect two white wires to generator

set terminal L1.

(2) Connect two red wires to generator set

terminal L2.

(3) Connect two black wires to generator

set ground terminals.

NOTE

Plate instruction 10559747 (fig. 2-24.1)

indicates proper connecting instructions of wire leads to engine generator

output terminals.

(4) Adapter assembly should be retained

with Radar Chronograph Set: M36 when the

generator is separated from the system.

2-15. Installation of Instrument light M53

For operation at night, instrument light M53 is

used as a source of illumination for the reticle of

telescope XM128 and for the scales and controls.

To install instrument light M53 on the telescope,

proceed as follows :

a. Remove instrument light from case stowed

in chronograph accessories case.

b. Remove protective cap from reticle light

(fig. 1-14) and return cap to case.

c. Screw lamp bracket assembly (fig. l-l) on

to reticle light.

d. Slide dovetail foot on lamp bracket assembly into dovetail slot provided on lower left side

of telescope XM128 (fig. 2-25).

e. Turn knob on instrument light case clockwise to turn on reticle light and adjust light to

desired level.

f. To operate hand-held lamp on instrument

light, press the pushbutton switch on the handle

and direct light beam as desired.

2-16. Installation of Aiming Post light M14

TO provide an aiming point for optical alinement

that is visible at night, the aiming post light

(fig. 2-12) is clamped to the aiming post with

the lamp at the same height as the tape would be

for daylight alinement. The light is turned on by

means of the toggle switch, and the lamp shield

is turned toward the weapon and chronograph so

that the light is visible to both. If two aiming

posts are used, they are made distinguishable by

placing a red filter in front of one light and a

green filter in front of the other. When radar

chronograph optical alinement is done at night,

the aiming post light can be used to provide a

visible reference.

2-17. Using Fire Control Quadrant Ml Al

with Radar Chronograph Set

After optical alinement check or adjustment, the

elevation scale should be checked for proper calibration as outlined below :

a. Remove the telescope from chronograph

mount.

b. Place fire control quadrant M1A1 on telescope mount (fig. 2-26).

c. Adjust the quadrant until the bubble is centered in the vial. Note the quadrant elevation

reading.

d. Loosen the two elevation dial pointer adjustment screws (fig. 2-19).

e. Set elevation dial pointer to the elevation

reading noted in c above.

f. Tighten the two dial pointer adjustment

screws and recheck elevation reading.

NOTE

The elevation scale calibration is independent of the optical alinement check

or adjustment and may be performed

separately. (For example, if the elevation scale is replaced, it may be calibrated without optical alinement.)

However, anytime an optical alinement

adjustment is made, the elevation scale

calibration must be checked.

44
C 3, TM 9-1290-325-12/1

Figure 2-24. Generator Set HF-0.5 MD.

44.1
C 3, TM 9-1290-325-12/1

Figure 2-24.1, Adapter Assembly-partial exploded view.

Figure 2-25. Installing instruments light M53 on

telescope XMl28 for night operation.

44.2
TM 9-1290-325-12/1

Figure 2-26. Fire control quadrant M1A1 on chronograph.

Section V. OPERATION UNDER UNUSUAL CONDITIONS

2-18. General Conditions

In addition to the normal operating procedures for usual conditions, special instructions for operation under unusual conditions

are contained herein. In addition to the normal

preventive maintenance service, special care in

cleaning and lubricating must be observed

where extremes of temperature, humidity, and

atmospheric conditions are present or anticipated. Proper cleaning, lubrication, storage,

and handling of lubricants not only insure operation and functioning but also guard against

excessive wear of the working parts and deterioration of the materiel.

2-19. Operation in Extreme Cold

In climates where the temperature is consistently below zero degrees F, it is necessary to

prepare materiel for cold weather operation.

For description of operations in extreme cold,

refer to TM 9-207.

Caution.- It is imperative that approved extreme cold weather practices and precaution

be followed. TM 4-207 must be. considered as

essential supplement to this manual.

a. Avoid breathing on the rear panel

causing condensation which might freeze and

obscure control positions or calibration.

45
TM 9-1290-325-12/1

b. Exercise the various controls through

their entire range, at intervals as required, to

aid in keeping them from freezing in place and

to reduce the effort required to operate them.

c. When chronograph is not in use,. pay

particular attention to potecting it with proper

covers. Keep covers in place as much of the

time as firing conditions permit, to prevent

snow and ice from entering the working parts.

d. See FM 31-70 for additional information

on operation in the arctic.

2-20. Operation In Extreme Heat

a. Avoid prolonged exposure to the direct

rays of the sun; provide shade as much as possible.

b. Cover equipment when not in use to protect from excessive accumulation of moisture.

c. Perspiration from the hands in a contributing factor to rusting because it contains

acids and salts. After handling materiel, clean

and wipe dry.

2-21. Operation in Humid or Salty

Atmosphere

a. Inspect mechanisms frequently when operating in hot moist areas.

b. Moist and salty atmospheres have a tendency to emulsify oils and grease and destroy

their rust-preventive qualities. Inspect all parts

frequently for corrosion. Keep covers in place

as much of the time as firing conditions permit.

2-22. Operation in Dusty or Sandy

Conditions

a. Clean the chronograpn more frequently

when operating in sandy areas. Exercise particular care to keep sand out of the mechanisms

when carrying out inspecting operations.

b. Keep covers in place as much of the time

as firing conditions permit. Shield parts from

flying sand with tarpaulins during d&assembly

and assembly operations.
TM 9-1290-325-12/1

CHAPTER 3

ORGANIZATIONAL MAINTENANCE INSTRUCTIONS

Section I. REPAIR PARTS, SPECIAL TOOLS, AND EQUIPMENT

3-1. Repair Parts 3-2. Tools and Equipment

Repair parts and equipment issued to the Tools and equipment having general appliusing organization for operating and maintaining the radar chronograph set M36 are listed cation to this materiel are listed in section IV

in the Basic Issue Items List, section II of ap of appendix B.

pendix B.

Section II. LUBRICATION AND PAINTING

3-3. General

Lubrication is not required for normal operation or maintenance of the materiel.

3-4. Painting

Preparation for painting procedures are described in detail in TM 3-213.

3-5. Cleaning

a. General. Any special instructions required

for specific mechanism or parts are contained

in the pertinent section. General cleaning instructions are as outlined in b through g

below.

b. Metal Parts.

(1) Use dry cleaning solvent or mineral

spirits paint thinner to clean or wash

grease or oil from all metal parts of

the radar chronograph set M36.

(2) After the parts have been cleaned,

dry them thoroughly and apply a

light grade of aircraft instrument

lubricating oil to all parts having unpainted polished surfaces to prevent

rusting.

c. Rubber Parts. Clean gaskets (located between chronograph front and rear sections)

and telescope eyeshield (fig. B-1, App B) with

warm water. Apply a light coating of powdered

talcum to preserve the rubber.

d. Air Filters. To clean the air filters located at the bottom of the radar chronograph

(fig. 3-1) loosen the six dzus fasteners holding

each air filter retaining plate to the rear case

section and remove the filters; then proceed to

the following:

(1) Immerse air filters in trichloroethane

solvent and agitate to aid cleaning

action.

(2) Remove filters from solvent and

shake to remove excess solvent.

(3) Allow filters to dry, then spray a

small amount of light lubricating oil

into filter mesh.

(4) Allow excess oil to drain off before

reinstalling filters.

e. Glass and Plastic Surfaces. Moisture due

to condensation may collect on the windows of

the instrument when the temperature of the

parts is lower than that of the surrounding air.

This moisture, if not excessive, can be removed

by placing the instrument in a warm place or

wiping with a soft, lint-free. cloth.

f. General Precautions in Cleaning.

(1) Dry cleaning solvent or mineral

spirits paint thinners are inflammable

4 7
TM 9-1290-325-12/1

and should not be used near an open

flame. Fire extinguishers should be

provided when these materials are

used, Use only in well ventilated

places.

(2) These cleaners evaporate quickly and

have a drying effect on the skin. If

used without gloves, they may cause

cracks in the skin and, in some individuals, a mild irritation or inflammation.

(3) The use of diesel fuel oil, gasoline,

or benzine (benzol) for cleaning is

prohibited.

g. Paint and Finish. Organizational maintenance personnel will perform both touch up

and complete paint refinishing on fire control

materiel when required. Care will be exercised

when repainting fire control materiel to prevent paint from covering scales, lenses, bearing

surfaces, telescope seats, etc., in order to maintain these and like surfaces in efficient working

condition.

Figure 3-1. Chronograph bottom view showing

air filters removed.

Section III. PREVENTIVE MAINTENANCE CHECKS AND SERVICES

3-6. Preventive Maintenance Checks and 3-7. Reporting Deficiencies

Services The “sequence number” column of tables

a. Daily Inspection. Refer to table 2-1. 3-1 and 3-2 provides the identification numbers which are to be used when reporting unb. Intermediate Inspection. Refer to table corrected deficiencies on DA Form 2404 (see

3-2. TM 38-750).

Sequence

number

1

2

3

4

Required Paragraph/

every Item and procedure reference

Pre-operation 2-7c

Pre-operation

Pre-operation

Chrongraph-Check that all operating controls

move without binding. Check that ventilation

blowers are operating. Check illumination of indicator and reset lamps.

5 Radar Test Receiver-External visual examination

for mechanical damage.

All components- Clean, wipe dry inspect for evidence

of corrosion or paint chipping.

Chronograph and Tripod- External visual examination for mechanical damage.

Telescope XM128-Visual examination of eyeshield

and sunshade for signs of deterioration, fungus

growth, and dirt.

Pre-operation

Pre-operation

48

Table 3-1. Preventive Maintenance Checks and Services

3-5c

2-7b
C 3, TM 9-1290-325-12/1

Table 3-1. Preventive Maintenance Checks and Services -Continued

Sequence Required every Item and procedure Paragraph/

No. reference

6 Pre-operation --------- Tripod Exercise each tripod leg to observe that telescoping legs move

without binding.

7 Pre-operation -------- Bracket Installation-Inspect for loose hardware (jeep mounting) ----------.

8 Pre-operation -------- Microphone-External visual examination for mechanical damage ----------.

9 Pre-operation -------- Instrument Light M53-Visual examination of wire leads for frayed or

broken insulation.

10 Pre-operation -------- Cable and Reel Assembly-Visual examination for cracked insulation,

fraying, loose wires, and damage to connectors.

11 Pre-operation -------- Lamp Bracket- Visual examination for damaged threads or broken window.

12 Pm-operation -------- Chronograph Automatic Reliability R&r-External visual examination for

mechanical damage.

13 Pm-operation -------- Adapter Assembly -Visual examination of wire leads for frayed or broken

insulation, missing mounting hardware and/or damaged components.

Table 3-2. Preventive Maintenance Checks and Services

Sequence Required every Item and procedures

Paragraph/

No. reference

1 Intermediate ---------- Radar Chronograph-Check components for damag e ----------------------------------- 2-3 f

2 Intermediate ---------- Chronograph and Tripod- Use common hand tools to tighten loose hardware.

3 Intermediate ---------- Special Purpose Cable-Check for cracked insulation, fraying, loose wire, 2-3 f

and damaged connector.

4 Intermediate ----------- Microphone-Check for loose hardware or damaged connector using common

hand tools.

6 Intermediate ----------- Bracket Installation (Jeep Mounting) -Check adapter plate for loose or

damaged hardware using common hand tools.

Section IV. TROUBLESHOOTING

3-8. General

This section contains instructions for troubleshooting the radar chronograph set.

3-9. Scope

Troubleshooting is a systematic isolation and

remedy of malfunctions and defective components by means of symptoms and tests. Malfunctions not correctable by actions listed in table

3-3 will be referred to direct support maintenance.

Malfunction

1. POWER lamp does not light when

power switch is on. 1 2 3

2 One or both blowers fail to operate. 1 2 3

3. MONITOR SELECTOR switch

fails to operate (as shown by

meter). 1 2 3

4. Incorrect LINE voltage reading on

external monitor meter.’

5. MONITOR meter indicates above

green band with MONITOR SELECTOR in B+ position.’

Table 3-3. Troubleshooting

Probable cause Corrective action

a POWER lamp is defective. a. Replace POWER lamp (para 8-20).

b. Burned out fuse. b. Replace fuse (para 8-21).

a. No power input from generator. c. Adjust generator output. Notify DS

a.. Defective blower motor.

b. Defective wiring.

c. Defective starting capacitor.

a. Defective MONITOR SELECTOR

maintenance.

a. Notify DS maintenance.

b. Notify DS maintenance.

c. Notify DS maintenance.

a. Notify DS maintenance.

switch.

b. Defective wiring.

a. Output of generator not correct

b. Blown fuse A6F1 or A6F2.

c. Defective MONITOR meter.

a. Low output from -500V section of

power supply.

b. High 22V or 170V output.

c. Notify DS maintenance.

a. Replace POWER SUPPLY subassembly A6 (para 8-18).

b. Replace POWER SUPPLY subassembly A6 (para 8-18).

49

b. Notify DS maintenance.

a. Adjust generator and notify DS

maintenance

b. Replace fuse.
C 3, TM 9-1290-325-12/1

Table 3-3. Troubleshooting-Continued

Malfunction

6. MONITOR meter indicates full

scale with MONITOR SELECTOR in B+ position.’

7. MONITOR meter indicates 1⁄4 scale

or less with MONITOR SELECTOR in B+ position.’

8. MONITOR meter indicates below

normal AGC reading with MONITOR SELECTOR in AGC V

position. 1

9. MONITOR meter will not indicate

below green band with MONITOR SELECTOR in LEAKAGE

position (indicating lower than

expected leakage signal) . 1

10. MONITOR meter will not indicate

in green band with MONITOR

SELECTOR in LEAKAGE position (indicating high level of

leakage signal) . 1

11. MONITOR meter indicates below

green band scale with MONITOR

SELECTOR in signal position

and CAL 1-OPER-CAL 2 switch

in CAL 2 position and VELOCITY selector in 925-1150 position

(indicating low calibration signal

level). 1

12. Counter does not indicate when

CAL 1-OPER-CAL 2 switch is in

CAL 2 position.’

13. Internal meter indicates greater

than ±2 μa with selector in AFC

DISCR position.’

See footnotes at end of table.

Probable cause

- 500V absent.

Either 22V or 170V absent.

Excessive noise.

a. Klystron not oscillating.

b. Mixer crystal diode CR3 or CR4

defective,

d. Defective 45mc oscillator in IF

c. Defective modulator crystal diode

(CR5 or CR6).

assembly.

a. IF amplifier oscillating.

b. Defective waveguide.

c. Incorrect AFC adjustment.

d. Incorrect LEAKAGE ADJUSTMENT.

a. 75 kc oscillator (AGA10) not operating.

b. Audio amplifler A3 not operating.

c. Counter subassembly ASAS not operating.

d. Defective VELOCITY selector

switch.

a. Same as 11 above.

b. Faulty counter assembly.

a. AFC not alined.

b. Discriminator crystal diodes CR1

and/or CR2 defective.

c. AFC not adjusted.

Corrective action

Replace POWER SUPPLY subassembly A6 (para 3-18).

Replace POWER SUPPLY subassembly A6 (para 3-18).

a. Adjust LEAKAGE CONTROLS 1

and 2 (para 2-9).

b. Replace AUDIO AMPLIFIER subassembly A3 (para 3-16).

a. Replace IF subassembly A4 (pars

3-12).

d. Replace IF subassembly A4 (para

3-12).

a.. Check AFC adjustment. Replace

klystron if necessary (para 3-24).

b. Replace crystal diode CR3 and/or

CR4, if defective, check crystal

currents on internal monitor

meter (para 3-13).

c. Replace CR5 and/or CR6 (para 3-

18).

a. Replace IF subassembly A4 (para

3-12).

b. Notify DS maintenance.

c. Adjust AFC (para 3-24).

d. Adjust LEAKAGE CONTROLS 1

and 2 (para 2-9).

a. Replace DIGITAL COUNTER subassembly AS (para 3-17).

b. Replace AUDIO AMPLIFIER subassembly A3 (para 3-16).

c. Replace DIGITAL COUNTER subassembly AS (para 3-17).

d. Notify DS maintenance.

a. Check all steps in 11 above.

b. Replace DIGITAL COUNTER subassembly (para 3-17).

a. Replace AFC subassembly A2 (para

3-15).

b. Replace diodes CR1 and/or CR2

(para 3-13).

c. Adjust AFC (para 3-24).

50
C 1, TM 9-1290-325-12/1

Table 3-3. Troubleshooting-Continued

Malfunction

14. Internal meter indicates leas than

+40 to +70 μa with elector in

MOD DRIVE position. 1

15. Internal meter indicates less than

+45 to +90 μa with selector in

MOD XTAL 1 position and/or

less than -45 to -90 μa with

selector in MOD XTAL 2

position. 1

16. Internal meter indicates more than

-20 to -80 pa with selector in

MXR XTAL 1 position and/or

more than +20 to +80 μa with

selector in MXR XTAL 2

position.1

17. Internal meter indicates less than

-20 to -80 μa with selector in

MXR XTAL 1 position and/or

less than + 20 to +80 μa with

selector in MXR XTAL 2

position.1

18. Some, but not all counter indicators fail to light. 1 2 3

19. All counter indicators fail to

light. 1 2 3

20. Counter assembly fails to reset

(indication other than 00000).1 2 3

21. RESET indicator fails to light 1 2 3 --

22. Blower B1 or B2 excessively

noisy. 1 2 3

23. RESET indicator lamp stays 9 lit

when microphone is tapped. 1

24. RESET indicator lamp goes out

and counter indicators fail to

read correctly when microphone

is tapped and CAL 1-OPER-CAL

2 switch is in CAL 1 position.1

25. Counting accuracy consistently off

compared with standard readings

indicated on CARR simulator

decal.’

Probable cause

a. A4R27 improperly adjusted.

b. 45 mc oscillator not operating.

c. Modulator crystal diode CR5 or

CR6 defective.

a. Klystron not oscillating.

b. Modulator crystal CR5, CR6

defective.

LEAKAGE adjustment incorrect (too

much leakage).

a. Klystron not operating.

b. Mixer crystal CR3 and/or CR4

defective.

c. 45 mc oscillator not operating.

a. Defective counter indicators.

b. Defective counter assembly.

a. Defective RESET switch.

b. Defective counter assembly.

c. Defective power supply.

Defective counter assembly.

a. Defective clamp.

b. Defective counter module A5A6.

Defective blower.

a. Defective microphone.

b. Defective microphone cable

c. Defective counter A5A5, A5A4, or

A5A3.

d. Microphone sensitivity incorrect.

Defective counter assembly.

a. Counting period off due to frequency

in A5A7.

b. Klystron frequency off.

a. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

b. Replace DIGITAL COUNTER

subassembly A5 (pars 3-17).

a. Replace DIGITAL COUNTER

A5 (para 3-17).

b. Replace DIGITAL COUNTER

A5 (para 3-17).

c. Replace POWER SUPPLY A6

(para 3-18).

Replace DIGITAL COUNTER subassembly A5 (para 3-17).

a. Replace lamp (para 3-19).

b. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

Notify DS maintenance.

a. Replace microphone.

b. Notify DS maintenance.

c. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

d. Adjust microphone sensitivity.

Replace DIGITAL COUNTER subassembly A5 (para 3-17).

Corrective action

a. Replace IF subassembly A4

(pars 3-12).

b. Replace IF subassembly A4

(para 3-12).

c. Replace crystal diode CR5 and/or

CR6 (para 3-13).

a. Replace klystron (para 3-14).

b. Replace modulator crystal diode

CR5 and/or CR6 (para 3-13).

a. Adjust LEAKAGE 1, 2 controls

to minimize leakage (para 2-9).

b. Replace IF subassembly A4

(para 3-12).

a. Replace klystron.

b. Replace crystal diode CR3 and/

or CR4 (para 3-13).

c. Replace IF subassembly A4

(para 3-12).

a. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

b. Replace klystron (para 3-14).

51
C 1, TM 9-1290-225-12/1

Table 9-9. Troubleshooting-Continued

Malfunction

26. Calibrate count consistently off;

counter appears to operate

normally. 1

27. With P1 diaconnected AFC not

adjustable. 1

18. No meter indication on CARR

simulator.*

19. MONITOR meter cannot be

made to indicate in green band

or higher with switch in

SIGNAL position.*

30. RESET indicator light fails to

light and/or COUNTER

assembly fails to indicate

all zeros when reset. 1 2 3

31. RESET indicator lamp does not

extinguish when START

button on CARR simulator

is depressed. 2

32. Gross incorrect readout on radar

chronograph.*

33. Out of tolerance readout on

radar chronograph as indicated

on CARR simulator decal.*

Probable cause Corrective action

A5A10 oscillator frequency off 75 kc. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

a. Defective AFC. a. Replace AFC subassembly A2

(para 3-15).

b. Defective discriminator crystal

diodes CR1 and/or CR2.

b. Replace CR1 and/or CR2 discriminator crystal diode

(para 3-13).

a. Incorrect alinement or radar

chronograph and radar test

receiver.

a. Realine chronograph and test

receiver.

b. Toggle switch on CARR simulator

incorrectly positioned.

c. Defective diode in radar test

receiver.

b. Set toggle switch on CARR

simulator in METER position.

c. Replace diode (IN263) (para

3-23).

d. Open wire in coaxial cable.

e. Open wire in 50 ft. cable.

f. Defective klystron in radar

chronograph.

d. Notify DS maintenance.

e. Notify DS maintenance.

f. Replace klystron (para 3-14).

g. Defective radar chronograph

h. Defective MONITOR METER

in CARR simulator.

a. Incorrect alinement of radar

chronograph and radar test

receiver.

g. Notify DS maintenance.

h. Replace CARR simulator.

a. Realine radar chronograph and

test receiver.

b. Toggle switch on CARR simulator

incorrectly positioned.

c. DELAY selector on CARR

simulator incorrectly positioned.

d. VELOCITY selector switch on

radar chronograph and CARR

simulator not in coincident

positions.

e. Defective CARR jumper cable.

f. Defective radar chronograph.

g. Defective CARR simulator.

a. Defective lamp.

b. Defective counter module A5A6.

c. Defective CARR simulator.

a. MIC SENS control on radar

chronograph set too low.

b. Defective CARR jumper cable.

c. Defective counter module A5A6.

d. Defective CARR simulator.

a. Defective radar chronograph.

b. Defective CARR simulator.

a. Incorrect alinement of radar

chronograph and radar test

receiver.

b. Defective radar chronograph.

c. Defective CARR simulator.

b. Set toggle switch on CARR

simulator in OSC position.

c. Set DELAY selector on CARR

simulator in CONT position.

d. Set VELOCITY selector

switches on chronograph and

CARR simulator in coincident

positions.

e. Replace jumper cable.

f. Notify DS maintenance.

g. Replace CARR simulator.

a. Replace lamp (para 3-19).

b. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

c. Replace CARR simulator.

a. Reset MIC SENS control to

position 10.

b. Replace jumper cable.

c. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

d. Replace CARR simulator.

a. Notify DS maintenance.

b. Replace CARR simulator.

a. Realine radar chronograph and

test receiver.

b. Notify DS maintenance.

c. Replace CARR simulator.

See footnotes at end of table.

52
C 1, TM 9-1290-325-12/1

Malfunction

34. Incorrect readout on radar

chronograph (as per table

2-2-delay settings) . 2

Table 3-3. Troubleshooting -Continued

Probable cause Corrective action

a. Defective counter assembly in

chronograph.

b. Defective CARR simulator.

a. Replace DIGITAL COUNTER

subassembly A5 (para 3-17).

b. Replace CARR simulator.

Section V. REPAIR OF RADAR CHRONOGRAPH SET M36

3-10. General

This section contains general and specific instructions for repair of radar chronograph set M36.

Specific repairs and inspections within the scope

of the organizational level of maintenance arc described in order to restore the material to a serviceable condition.

3-11. Removal and Replacement of

Eyeshield and Sunshade (Fig. B1)

Note. Numbers listed below refer to figure B1 located

in appendix B.

a. Remove eyeshield (2) by expanding and removing retaining ring (1) from groove in eyeshield. Pull sunshade (3) off body assembly (4’).

b. Replace eyeshield (2) by expanding inside

diameter of eyeshield slightly, and sliding over the

end of eyepiece assembly until end of eyeshield

completely covers all of the circular grooves.

c. Expand retaining ring (1) and replace in

groove in eyeshield.

d. Replace sunshade (3) on body assembly (4).

3-12. Removal and Replacement of

Detector Amplifier Assembly A4

(IF Amplifier Detector) (Fig. 3-2)

a. Disconnect P3, P4, P5 and P6 from waveguide

assembly A1.

b. Loosen two retaining screws on P9 and disengage P9 from J1.

c. Remover detector amplifier A4 from cabinet.

d. Procedure for replacement of the detector amplifier A4 is obvious and does not require detailed

explanation.

e. Reconnects P3, P4, P5 an P6 to waveguide assembly A1.

3-13. Removal and Replacement of

Waveguide Diodes (Fig. B2)

Note. Numbers located below refer to figure B2 located

in appendix B.

The waveguide assembly includes six diode semiconductor devices. Two are in the discriminator

(CR1 and CR2) ; two are in the mixer (CR3 and

CR4) ; and two are in the modulator (CR5 and

CR6). The diodes are located directly underneath

connectors having corresponding. numbers (fig.

3-2). To remove and replace these diodes proceed

as follows :

a. Unscrew knurled diode holder cap (1).

b. Remove cap (1) along with holder (2) and

diode semiconductor device (3).

c. Remove diode (3) from holder (2) noting

polarization.

d. Replace diode (3), holder (2) and cap (1) in

appropriate socket, noting diode polarization.

3-14. Removal and Replacement of

Klystron Electron lube (Fig. B2)

Note. Numbers locked below refer to figure B2 located

in appendix B.

a. Disconnect klystron leads from terminal board

TB2 (fig. .3-2), identifying each lead connection.

b. Remove four screws (6), washers (5) and nuts

(4) which hold klystron electron tube (7) to waveguide section.

c. Replace with new klystron electron tube (7),

securing with screws (6), washers (5), and nuts

(4). Care must be taken in tightening the cap

screws so that the tube flange is not distorted and

the tube pinch-off is not cracked.

d. Connect klystron electron tube lends to terminal board TB2.

53
C 1, TM 9-1290-325-12/1

Figure 3-2. Removal and replacement of detector amplifier assembly A4.

3-15. Removal and Replacement of

Frequency Control A2 (Fig. 3-3)

a. To remove frequency control A2 from chronograph cabinet, loosen two captive screws holding

frequency control to main frame, and pull forward to disengage electrical connector.

b. Procedure for replacement. of frequency control A2 is obvious and does not require detailed explanation.

3-16. Removal and Replacement of Audio

Frequency Amplifier A3 (Fig. 3-4)

a. To remove audio frequency amplifier A3 from

chronograph case, remove four socket head screws

54

ou panel, pull forward to disengage electrical connector, and slide A3 assembly out.

b. Procedure for replacement. of audio frequency

amplifier A3 is obvious and does not require detailed explanation.

3-17. Removal and Replacement of

Digital Display Indicator AS (Fig. 3-4)

a. To remove digital display indicator A5 from

chronograph case, remove four socket. head screws

on panel, pull forward to disengage electrical connector, and slide A5 assembly out.

b. Procedure for replacement of digital display

indicator A5 is obvious and does not require detailed explanation.
C 1, TM 9-1290-325-12/1

Supply A6 (Fig. 3-4)

3-18. Removal and Replacement of Power

a. To remove power supply A6 from cabinet,

remove four socket head screws on panel, pull forward to disengage electrical connector, and slide

A6 assembly out.

b. Procedure for replacement of power supply

A6 is obvious and does not require detailed

explanation.

3-19. Removal and Replacement of Reset

lamp (Fig. B-3)

Note. Numbers listed below refer to figure B3 located

in appendix B.

a. Turn indicator light ( 1) counterclockwise

end remove from panel.

b. Remove lamp (2) from indicator light.

c. Insert new lamp (2) into indicator light (1).

d. Replace indicator light (1) in panel ; screw

into place by rotating clockwise.

3-20. Removal and Replacement of

POWER ON lamp (Fig. B3)

Note. Numbers listed below refer to figure B3 located

in appendix B.

a. Turn indicator light (3) counterclockwise

and remove from panel.

b. Remove lamp (4) from indicator light.

c. Insert new lamp (4) into indicator light (3).

d. Replace indicator light in panel: screw into

place by rotating clockwise.

3-21. Removal and Replacement of Fuses

(Fig. B-3)

Note. Numbers listed below refer to figure B3 located

ln appendix B.

a. Turn fuse holder (B) counterclockwisc. and

remove from panel.

b. Remove fuse (6) from fuse holder.

c. Insert new fuse (6) into fuse holder (5).

d. Replace fuse holder (5) into panel; screw

into place by rotating clockwise.

55
C2, TM 9-1290-325-12/1

Figure 3-4. Radar chronograph with telescope XM128.

3-22. Removal and Replacement of lamps

in Instrument Light M53 (Fig. B-4)

Note. Numbers listed below refer to figure B-4 in appendix B.

a. Unscrew the window (3) from the handlight or the protective cap (4) from the reticle

light of the instrument light M53.

b. Unscrew and remove the lamp (5) from

the handlight or from the reticle light.

c. Replace the lamp (5) with a new one and

screw back the window (3) on the handlight

or the protective cap (4) on the reticle light

of instrument light M53.

d. Dry-cell type batteries are used in instrument light M53. Unscrew cap (1) and remove

batteries (2) from case (6) whenever the lights

are not in use. Chemical reactions setup in an

exhausted battery will damage the tube body.

e. Replace batteries (2) and screw on cap

(1) when lights are to be used.

3-23. Removal and Replacement of Diode

in Radar lest Receiver (Fig. B5)

Note. Numbers listed below refer to figure B5 in

appendix B.

a. Unscrew knurled diode holder cap (1).

b. Remove cap (1) along with holder (2)

and diode semiconductor device (3) from radar

test receiver.

c. Remove diode (3) from holder (2),

noting polarization.

d. Replace diode (3), holder (2) and cap

(1) on test receiver noting diode polarization.

56
3-24. Adjustments

a. Disconnect plug P1 from its mating connector (fig. 2-8).

b. Set internal monitor selector switch to AFC

DISC (fig. 2-8).

c. Rotate AFC adjust A2R16 (fig. 2-9) and

null the needle on the internal meter to read 0 ± 5

microamperes.

d. Reconnect plug P1 to the mating connector

and note that the internal meter reads 0±5

microamperes.

e. Set internal monitor selector switch (fig.

2-8) to MOD DRIVE.

f. Adjust A4R27 control (fig. 2-8) until the

needle of the internal monitor indicates a reading

between +70 and +80 microamperes.

NOTE

This adjusts the modulator drive level.

3-25. Crystal Current Tests

a. Modulator Crystal Current Tests. When

checking the modulator crystal currents, perform

a through c of paragraph 2-9 and proceed to the

following :

(1) Set internal monitor selector switch to

MOD XTAL 1 (fig. 2-8) and note that internal

monitor meter indicates between +45 and +90

microamperes.

(2) Set internal monitor selector switch to

MOD XTAL 2 and note that internal monitor

C 3, TM 9-1290-225-12/1

meter indicates between -46 and -90 microamperes.

NOTE

If current readings are low, the crystals

may need replacement.

b. Mixer Crystal Current Tests. The leakage

adjustments must be completed before mixer

crystal current can be checked. When checking

the mixer crystal currents, perform a through c

of paragraph 2-9 and proceed to the following:

(1) Set internal monitor selector switch to

MXR XTAL 1 (fig. 2-8) and adjust LEAKAGE

ADJUSTMENT 1 and 2 controls (fig. 1-6) for

minimum current indication on internal monitor

meter. The internal monitor meter should indicate between -20 and -80 microamperes.

(2) Set internal monitor selector switch to

MXR XTAL 2 (fig. 2-8). The internal monitor

meter should indicate between +20 and +80 

microamperes.

3-26. Inspection

Inspection of the radar chronograph set is limited to visual checks to see that the set is correctly assembled, properly secured, and in good

condition. Perform completely the procedures

outlined in paragraph 3-6 and preventive maintenance tables 3-1 and 3-2. Any defects or improper operating characteristics, the correction

of which is found to be beyond the scope of the

operator or organizational level, must be reported

to the attention of higher category or level of

maintenance.

57
C 3, TM 9-1290-325-12/1

[This page intentionally left blank.]

58
TM 9-1290-325-12/1

CHAPTER 4

SHIPMENT AND LIMITED STORAGE AND DEMOLITION

TO PREVENT ENEMY USE

Section I. SHIPMENT AND LIMITED STORAGE

4-1. General

Commanders are responsible for insuring

that all material issued or assigned to their command is maintained in a serviceable condition

and is properly cared for, and that the personnel under their command comply with technical instructions. Lack of time, lack of trained

personnel, or lack of proper tools may result

in a unit being incapable of performing maintenance for which it is responsible. In such

oases, unit commanders with the approval of

their commanders, may place materiel that is

beyond the maintenance capability of the unit

in administrative storage or return it to supply

agencies. When preparing the radar chronograph set M36 for administrative storage or for

shipment, the unit commander will be responsible for processing the materiel in such a manner

as to protect it against corrosion, deterioration

and physical damage during shipment or

during periods of administrative storage.

4-2. Administrative Storage Instructions

Administrative storage is restricted to a

period of 90 days and must not be extended,

unless the materiel is reprocessed in accordance

with the following procedures:

a. Storage Procedure.

(1) Perform a quarterly preventive maintenance (PM) service on the materiel

intended for administrative storage.

This maintenance will consist of inspecting, cleaning, servicing, preserving, lubricating, adjusting and

minor replacement of repair parts, if

required.

(2) Materiel will be stored in a humidity

controlled storage area.

b. Inspection in Administrative Storage.

(1) Visual inspection of materiel in administrative storage must be conducted at least once each month. A

record of these inspections will be

maintained and noted on a tag. Tags

are to be attached to the materiel in a

conspicuous location.

(2) When rust or deterioration is found,

necessary reprocessing for administrative storage will be immediately

accomplished.

4-3. Shipping Instructions

a. Preparation for Shipment. The chronograph when removed from storage for shipment need not be repackaged unless inspection reveals it to be inadequately packaged or

when it is necessary because of anticipated intransit weather or shipping conditions. Packaging must not be removed or disturbed except

as it is necessary to insure that the chronograph is complete and serviceable. If packaging

has been removed, it must be repackaged prior

to shipment as prescribed in d through g below.

b. Description of Reusable Container. The

case for shipping and storing the radar chronograph with its attached mount is a specially designed reusable plastic container (fig. 4-1).

The two-piece case, formed of high impact

plastic, provides protection against moisture,

vapor, and physical shocks which might dam59
TM 9-1290-325-12/1

age the radar chronograph and its mount.

Special cushioning cradles are provided in the

upper and lower sections of the case. The two

sections are held together by ten adjustable

latches. A two way automatic relief valve in the

pressure-tight case automatically opens to

equalize internal and external air pressures

whenever the differential exceeds 1.5 pounds

per square inch. Before opening the case the

pressure relief valve is manually opened by

pressing a button. The transit case is provided

with four carrying handles, two 1ocated at

each end.

c. Description of Radar Chronograph Accessories Case. The accessories for the chronograph are shipped and stored in a specially designed reusable plastic container (fig. 4-2).

The two piece case, formed of high impact

plastic, provides protection against water and

vapor, and protects against physical shock by

means of special cushioning in both upper and

lower sections, which is arranged to form cavities for equipment storage. The two sections are

held together by ten latches. A two-way automatic relief valve in the pressure-tight case

opens to equalize internal and external air

pressure whenever the differential exceeds 1.5

pounds per square inch. The valve is

manually opened by pressing a button before

opening the case.

d. Cleaning. Remove shop dirt and all other

foreign matter from metal surfaces of the

chronograph set by wiping with cloths soaked

in dry cleaning solvent 6860-264-9037 (55-

gallon drum) 1 or mineral spirits paint thinner

8010-246-6115 (55-gallon drum) 1 . Do nut apply solvent to electrical equipment or rubber

Figure 4-1. Reusable container.

If larger or smaller size than that indicated is required, refer to pertinent supply manual for applicable stock numbers.

60
TM 9-1290-325-12/1

Figure 4-2. Radar chronograph accessories case.

parts of any kind; use trichloroethane 6810-

664-0385 (5-gallon can)1 to clean electrical

equipment and related items such as wiring, insulation, contact points, etc. Use warm water

for cleaning rubber parts.

(2)

Note. Cloth or synthetic rubber gloves must be used

to protect hands from solvents.

e. Drying. All components must be thoroughly dried so that all cleaning residues are

removed immediately after cleaning.

f. Packaging. All components of the chronograph are to be returned to their original reusable containers for storage. To package proceed as follows:

(1) Disconnect all cables from chronograph connectors and screw connector

protective caps into place.

(3)

(4)

(5)

(6)

Rtemove telescope XM128 from chronograph and place it in carrying case

M87, Stow telescope and case in

chronograph accessories case (fig. 4-

3).

Loosen leveling base (lock handle.

Turn elevation level-adjust drive

knob until travel-lock pin can be

pushed in to engage sector gear.

Loosen the three tripod leveling base

lock handles, turn to release the leveling base, and lift off chronograph

and mount. Rest on clean padded

surface.

Loosen the elevation lock handle on

the mount yoke and swivel the chronograph unit into a position with the

antenna pointing away from the

1

 If a larger or smaller size than that indicated is required, refer to pertinent supply manual for applicable stock numbers.

61
TM 9-1290-325-12/1

(7)

(8)

(9)

(10)

(11)

(12)

Figure 4-3. Radar chronograph accessories case showing compartments.

mount base (1600-mil position on

chronograph elevation scale),

Tighten elevation lock handle.

Install protective cover (fig. 1-1) on

antenna reflector.

(13)

(14)

Lift chronograph and mount and carefully place in lower cradle section of

chronograph reusable container with

chronograph handles up (fig. 4-4).

Put upper cradle section in place and

strap down.

Close chronograph container cover

and engage and seal latches.

Loosen tripod spider hand knob to release spider assembly, and fold legs

in until stay rod latch engages with

stay rods.

(15)

(16)

(17)

Loosen leg clamp hand knobs and retract telescoping leg tube assemblies.

Place tripod in chronograph accessories case (fig. 4-3). If auxiliary

feet were in use, first clean them and

place on bottom of cushion cavity

with studs in holes provided.

Remove microphone from cable, and

package the microphone, and place in

proper compartment of chonograph

accessories case.

Place radar test receiver and special

purpose cable assembly in special

plastic case and insert into proper

compartment in chronograph accessories case.

Place chronograph automatic reliability rater (CARR) into proper com62
Figure 4-4 Chr

63
C 3, TM 9-1290-325-12/1

partment in chronograph accessories case.

(18) Remove lamp bracket assembly from

reticle light of instrument light M53, wrap in

grade A barrier material (ML-B-121), and fasten to the light case with tape. Replace protective cap.

(18.1) Remove adapter assembly from frame

of generator set, screw connector protective caps

into place, wrap in grade A barrier material

(MIL-B-121), and immobilize in the tripod area

of the accessory case.

(19) Place accompanying publications TM

9-1290-325-12/1, TM 9-1290-325-12/2, and

equipment logbook binder 7510-889-3494, in

chronograph accessories case.

(20) Check that repair kit is in proper compartment of chronograph acceasories case.

(21) Close chronograph accessories case

cover, engage latches, and apply security seals.

g. Packing and Marking Instructions.

(1) Packing. With the exception of the installation bracket (jeep mounting) no packing

other than that provided in the transit and storage cases is required. The installation bracket

shall be immobilized by bracing or blocking in a

snug fitting wooden box conforming to PPP-B621, class 2, style 4. The installation hardware

and instruction sheet shall be placed in a polyethylene bag and firmly secured to the bracket.

(2) Marking. Marking shall conform to

MIL-STD-129. Each box shall be “set” identified and shall indicate box number of the set and

serial numbers as required. Marking identification for boxes 1 and 2 of 4 (reusable container

and radar chronograph accessories case), shall

be clearly typed on printed cards and inserted

into their respective card holders.

Section II. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE

4-4. General

a. Destruction of the radar chronograph set

M36, when subject to capture or abandonment

in the combat zone will be undertaken by the

using army only when, in the judgment of the

unit commander concerned, such action is necessary in accordance with orders of or policy established by the Army commander.

b. The information that follows is for guidance only. Certain of the procedures outlined

require the use of explosives and incendiary

grenades that normally may not be authorized

items of issue to the using organization. The

issue of these and related materials and the

conditions under which destruction will be affected are command decisions in each case, according to tactical situation. Of the several

means of destruction, those most generally applicable are :

(1) Mechanical. Requires axe, pick mattock, sledge, crowbar, hammer, or .similar implement to smash meters, antenna assemblies,

modules, tubes, control panels, etc.

(2) Burning. Requires gasoline, oil, incendiary grenades, flame throwers, kerosene, or

other flammables to bum cords, cables, spare

parts, literature, etc.

(3) Demolition. Requires suitable ammunition or such explosives as grenades, powder

charges, or explosive compounds to demolish material where feasible or necessary.

(4) Gunfire. Includes artillery, machine

guns, rifles using grenades, and launchers using

antitank rockets. Under some circumstances,

hand grenades may be used.

(5) Disposal. Requires burying in the

ground, dumping in waterways or marshes, or

scattering so widely- as to preclude recovery of

essential parts which have not been completely

destroyed. In general, destruction of essential

parts followed by burning will usually be sufficient to render the materiel useless. However, selection of the particular method of destruction requires imagination and resourcefulness in

the utilization of the facilities at hand under the

existing conditions. Time is usually critical.

c. If destruction to prevent enemy use is resorted to, the materiel must be so badly damaged that it cannot be restored to a usable condition in the combat zone either by repair or

cannibalization. Adequate destruction requires

that all parts essential to the operation of the

materiel, including essential spare parts, be destroyed or damaged beyond repair. However,

when lack of time and personnel prevents destruction of all parts, priority is given to the

destruction of those parts most difficult to replace.

Equally important, the same essential parts must

be destroyed on all like materiel so that the

64
C 3, TM 9-1290-325-12/1

enemy cannot construct one complete unit from 4-5. Demolition of the Chronograph Set

several damaged ones. a. Method No. 1 -Mechanical Means.

d. If destruction by demolition or gunfire is

directed, due consideration should be given to

(1) Disconnect the chronograph from its

source of power.

(2) Remove the chronograph and the

the observance of appropriate safety precautions.

mount from their mounted position and place

them on the ground.

64.1

(3)

(4)

(5)

Unlock all socket head screws on the

rear panel and remove all main assemblies from the case.

Open the hinged front section so as

to expose the waveguide and IF amplifier assemblies.

Using an axe, pick mattock, sledge

hammer, or other heavy implement,

destroy the chronograph by smashing

the digital indicator display, audio

amplifier, power supply, IF amplifier, waveguide and AFC assemblies.

Smash the meter panel, switches,

blowers, subassemblies, tubes, terminal boards, antenna feed and reflector, chronograph control panels,

scales, sector gear of the mount, and

the chronograph case, Break or bend

the yoke shaped part of the mount so

as to render the mount useless.

b. Method No. 2-Burning.

(1) Disconnect the chronograph from its

source of power.

(2) Remove the chronograph and the

mount from their mounted position

and place them on the ground.

(3) Unlock all socket head screws on the

rear panel and remove all main assemblies from the case.

(4) Open the hinged front section so as

to expose the waveguide and IF amplifier assemblies as well as the interior of the chronograph case.

(6) Place the component parts of the

chronograph on a pile of combustible

materials. Pour gasoline or kerosene

over the chronograph component

parts and over the combustible materials. Ignite and take cover a safe

distance away from the materiel to be

burned.

(6) If a flame thrower or an incendiary

grenade is available, bum the materiel by using one or both of these

flammable so as to develop a hot

fire which will render the materiel

useless.

TM 9-1290-325-12/1

Warning: When using flammables,

extreme care must be observed so as

not to incur painful burns or poisoning from inhalation of toxic vapors.

c. Method No. 3-Demolition. Use explosives to complete demolition or to cause maximum damage, before burning, when time does

not permit complete demolition by other means.

Power charges fragmentation grenades or incendiary grenades may be used. Incendiary

grenades usually are most effective if destruction of small parts and wiring is desired.

(1)

(2)

(3)

(4)

Disconnect the chronograph from it

source of power.

Remove the chronograph and the

mount from their mounted position

and place them on the ground.

Open the hinged front section so as

to expose the interior of the chronograph two-section case.

Insert small powder charges to destroy the interiors, but for quick destruction of the component parts in

‘the chronograph, use fragmentation

or incendiary grenades. Get away

from the unit after the grenade is

placed.

d. Method No. 4-Gunfire. Generally, this

method is applicable only when the chronograph is to be destroyed in conjunction with

other equipment.

(1) Place the chronograph in the area

where other equipment and materiel

are to be destroyed by means of gunfire.

(2) With the aid of artillery, machine

guns, rifle grenades, or launchers

using antitank rockets, fire directly

toward the materiel or equipment.

Use as much ammunition as necessary

to completely destroy or render the

materiel and equipment useless.

e. Method No. 5-Disposal. Bury or scatter

destroyed parts or throw them into nearby

waterways or marshes. This is particularly important if a number of parts have not been

completely destroyed.

65

TM 9-1290-325-12/1

Figure B-1. Telescope XM128

8 3
TM 9-1290-325-12/1

Figure B-2. Waveguide assembly.

84
TM 9-1290-325-12/1

Figure B-3. Panel mounted lamp assemblies and fuses.

85
TM 9-1290-325-12/1

Figure B-4. Instrument light M53.

86
C 3, TM 9-1290-325-12/1

APPENDIX A

REFERENCES

A-1. Publications Indexes

The following publication indexes should be consulted frequently for latest changes or revisions of

references given in the appendix and for new publications relating to materiel covered in this manual.

Index of Administrative Publications ---------------------------------------------------DA Pam 310-1

Index of Blank Forms ---------------------------------------------------------------------------------------DA Pam 310-2

Index of Doctrinal, Training and Organizational Publications ----------------------------DA Pam 310-3

Index of Supply Catalogs and Supply Manuals (excluding types 7, 8, and 9) ---------DA Pam 310-6

Index of Technical Manuals, Technical Bulletins, Supply Manuals (Types 7, 8,

and 9), Supply Bulletins, and Lubrication Orders ---------------------------------------------DA Pam 310-4

Military Publication U.S. Army Equipment Index of Modification Work Orders ---DA Pam 310-7

A-2. Other Publications

a. General

Accident Reporting and Records -------------------------------------------------------------AR385-40

Army Maintenance Management System (TAMMS)-------------------------------------------------38-750

Authorized Abbreviations and Brevity Codes------------------------------------------------------AR 310-50

Camouflage----------------------------------------------------------------------------------------------------------------F M 6-20

Operator, Organizational and Field Maintenance Manual Cargo Trailer M100

(1/4, ton 2 wheels) --------------------------------------------------------------------------TM 9-871A

Dictionary of United States Army Terms ----------------------------------------------- AR 310-25

Firing Tables for Cannon, 155-MM Howitzer M1, M1A1 and M46, Firing Projectile, HE, M107, Projectile, HE M107B2, Projectile, Smoke, WP, M105; Projectile, Smoke, WP, M110; Projectile, Smoke, BE, M116 and M116B1 (HC and

Colored) ; Projectile, Gas, Persistent, HD, M110; Projectile, Gas Persistent, H,

M110 ; Projectile, Gas, Nonpersistent, GB, M121; Projectile Illuminating, M118

Models----------------------------------------------------------------------------------------FT155-A-3

First Aid for Soldiers ------------------------------------------------------------------------FM21-11

Malfunction involving Ammunition and Explosives-------------------------------------------AR 75-1

Report Control Symbol AMC-182 (MIN) -----------------------------------------------

Military Symbols -----------------------------------------------------------------------FM 21-30

b. Maintenance.

Care, Handling, Preservation and Destruction of Ammunition ---------------------TM 9-1300-206

DS, GS, and depot maintenance repair parts and special tools list for Radar

chronograph set: M86 w/E(1290-861-7106) ----------------------------------------------------TM 9-1290-325-35P

Direct support and general support maintenance manual : Radar chronograph

set: M86 w/E(1290-861-7106) ------------------------------------------------------------------------- TM 9-1290-325-34

DS, GS, and depot maintenance manual including repair parts and special tool

lists for Telescope, straight : XM128,1240-087-5527)----------------------------------- TM 9-1240-211-35

Northern Operations ---------------------------------------------------------------------------------- FM 81-71

Operation and Maintenance of Ordnance Material in extreme cold weather

-0” to -66” ------------------------------------------------------------------------------------TM 9-207

Operator’s manual for Truck, utility : 1⁄4-ton, 4 X 4, M151 (2320-542-4788) -----------TM 9-2820-218-10

Operator’s and organizational maintenance manual : Radar chronograph set :

M36 w/E (1290-861-7106) ------------------------------------------------------------------TM9-1290-325-12/2

A-1
C 3, TM 9-1290-225-12/1

Operator, organizational, direct support, general support and depot maintenance

manual : Generator set, gasoline engine driven, 0.5 kw(less engine) ac, 120/240

v, 60 hertz, 1 ph, DOD model MEP-014A(6115-923-4469) ac 120/240 v, 400

Hertz---------------------------------------------------------------------------------------------- TM 5-6115-329-15

Organizational direct and general support and depot maintenance repair parts

and special tool lists : Generator set, gasoline engine driven (less engine) 0.5

kw, ac, 120/240 v, ‘60 hertz, 1 ph, DOD model MEP-014A, (6115-923-4469) ac,

120/240 v, 400 hertz, 1 ph, DOD model MEP-019A, FSN 6115-940-7862,28 v, dc

DOD model MEP-024A, FSN 6115-940-7867-IPH-DOD model MEP-019A,

FSN 6175-940-7862,28 v, dc, DOD model MEP-024A, FSN 6116-940-7867 --------------------TM 5-6115-329-25P

c. Shipping and Storage.

Barrier Material ----------------------------------------------------------------------------------- MIL-B-121D

Marking and Packing of Supplies and Equipment : Marking of Supplies for Shipment------------------------------------------------------------------------------------------------S--746-30-6

Packaging Data Radar Chronograph Set M36 ---------------------------------------------------MIL-P-14232/

(P10525235)

Preservation, Methods of ----------------------------------------------------------------------- MIL-P-116E

Preservation, Packaging ; Packing and Marking of Items of Supply --------------------------------AR 700-15

Color Marking and Preparation of Equipment for Shipment -------------------------AR 746-1

Publications for Packaging Ordnance and General Supplies ---------------------------- SB 746-1

Report of Packaging and Handling Deficiencies ------------------------------------------ AR 700-58

Reusable Accessory Shipping Container for Radar Chronograph Set M36 ----------------- MIL-C-60230

Reusable Plastic Shipping Container for Radar Chronograph, 10526300 With

Mount Radar Chronograph 10512507 -------------------------------------------------- MIL-C-60228

Storage and Materials Handling-------------------------------------------------------------TM 743-200-1

Storage and Supply Activities Covered and Open Storage ----------------------------SB 740-1

A-2
APPENDIX B

C5, TM 9-1290-325-12/1

BASIC ISSUE lTEMS LIST AND ITEMS TROOP INSTALLED OR

AUTHORIZED LIST AND OPERATOR AND ORGANIZATIONAL

MAINTENANCE SUPPORT (INCLUDING REPAIR PARTS)

Section I. INTRODUCTION

B-1. Scope

This appendix lists basic issue items; items troop

installed or authorized; repair parts; and other

support equipment required for operation and

performance of organizational support maintenance

of the Radar Chronograph.

B-2. General

This Basic Item, Items Troop Installed or Authorized, Repair Parts is divided into the following

sections;

a. Section II - Basic Issue Items List. A list, in

alphabetical sequence, of items which are furnished

with and which must be turned in with the end item.

b. Section III - Items Troop Installed or Authorized

List. A list, in alphabetical sequence, of items which,

at the discretion of the unit commander, may

accompany the end item, but should not be turned in

with the end item.

c. Section IV -Repair Parts List. A list of repair

parts authorized for use in the performance of

maintenance. The list also includes parts which must

be removed for replacement of the authorized parts.

Parts lists are listed in figure and item number

sequence. Bulk materials are listed in FSN sequence.

d. Section VI -Federal Stuck Number and Part

Number Index. A list, in ascending numerical

sequence, of all Federal stock numbers appearing in

the listings, followed by a list, in alphameric

sequence, of all part numbers appearing in the

listings. Federal stock number and part numbers are

referenced to each illustration figure and item

number appearance. This index is followed by a

cross-reference list of reference designations to

figure and item numbers when applicable.

B-3. Explanation of Columns

The following provides an explanation of columns

found in the tabular listings:

a. Illustration. This column is divided as follows:

(1) Figure number. Indicates the figure number

of the illustration in which the item is shown.

(2) Item number. The number used to identify

each item called out in the illustration.

b. Source, Maintenance, and Recoverability Codes

(SMR).

(1) Source Code. Source codes are assigned to

support items to indicate the manner of acquiring

support items for maintenance, repair, or overhaul of

end items. Source codes are entered in the first and

second positions of the Uniform SMR Code format as

follows:

Code

PA

PB

PC

PD

PE

PF

PC

KD

KF

KB

MO

MF

MH

M D

AO

AF

AH

Definition

Item procured and stocked for anticipated or known usage.

Item procured and stocked for insurance purposes because

essentiality dictates that a minimum quantity be

available in the supply system.

Item procured and stocked and which otherwise would be

coded PA, except that it is deteriorative in nature.

Support item, excluding support equipment, procured for

initial issue or outfitting and stocked only for subsequent or additional initial issues or outfittings. Not

subject to automatic replenishment.

Support equipment procured and stocked for initial issue or

outfittings to specified maintenance repair activities

Support equipment which will not be stocked but which will

be centrally procured on demand.

Item procured and stocked to provide for sustained support

for the life of the equipment. It is applied to an item

peculiar to the equipment which, because of probable

discontinuance or shutdown of production facilities,

would prove uneconomical to reproduce at a later time.

An item of a depot overhaul/repair kit and not purchased

separately. Depot kit defined as a kit that provides

items required at the time of overhaul or repair.

An item of a maintenance kit and not purchased

separately. Maintenance kit is defined as a kit that

provides an item that can be replaced at organizational.

or intermediate levels of maintenance

Item included in both a depot overhaul/repair kit and a

maintenance kit.

Item to be manufactured or fabricated at the organizational level.

Item to be manufactured or fabricated at the direct

support maintenance level.

Item to be manufactured or fabricated at the general

support maintenance level.

Item to be manufactured or fabricated at the depot

maintenance level.

Item to be assembled at organizational level.

Item to be assembled at the direct support maintenance

level.

Item to be assembled at the general support maintenance

level.

B-1
C4, TM 9-1290-325-12/1

Code Definition

AD Item to be assembled at the depot maintenance level.

XA ltem in not procured or stocked because the requirements

for the item will result in the replacement of the next

higher assembly.

XB Item is not procured or stocked. If not available through

salvage. requisition.

XD A support item that is not stocked. When required. item

will be procured through normal supply channels.

NOTE

Cannibalization or salvage may be used as

a source of supply for any items source

coded above except those coded XA, XO,

and aircraft support items as restricted by

AR 700-42

(2) Maintenance code. Maintenance codes are

assigned to indicate the levels of maintenance

authorized to USE and REPAIR support items. The

maintenance codes are entered in the third and

fourth positions of the Uniform SMR Code format as

follows:

(a) The maintenance code entered in the third

position will indicate the lowest maintenance level

authorized to remove, replace, and use the support

item. The maintenance code entered in the third

position will indicate one of the following levels of

maintenance.

Code Application/Explanation

C Crew or operator maintenance performed within organizational maintenance.

0 Support item is removed, replaced, used at the oganizational level.

I Support item is removed, replaced, used by direct support

element of integrated direct support maintenance

F Support item is removed, replaced, and used at the direct

support level.

H Support item is removed, replaced, used at the general

support level

D Support items that are removed replaced, used at depot

mobile &pot, specialized repair activity only.

Codes “I” and “F” will be considered the

same by direct support units

(b) The maintenance code entered in the

fourth position indicates whether the item is to be

repaired and identifies the lowest maintenance level

with the capability to perform complete repair (i.e.,

all authorized maintenance functions This position

will contain one of the following maintenance codes.

Code Application/Explanation

0 The lowest maintenance level capable of complete repair of

the support item is the organizational level

F The lowest maintenance level capable of complete repair of

the support item is the direct support level.

H The lowest maintenance level capable of complete repair of

the support item is the general support level.

Code Application/Explanation

D The lowest maintenance level capable of complete repair of

the support item is the depot level, performed by (enter

applicable activity) depot, mobile depot or specialized

repair activity.

L Repair restricted to designated specialized repair activity.

Z Non reparable. No repair is authorized.

B So repair is authorized. The item may be reconditioned by

adjusting, lubricating, etc., at the user level. No parts or

special tools are procured for the maintenance of this

item.

(3) Recoverability code. Recoverability codes are

assigned to support items to indicate the disposition

action on unserviceable items. The recoverability

code is entered in the fifth position of the Uniform

Code format as follows:

Code Application/Explanation

Z Nonreparable item. When unserviveable. condemn and

dispose at the level indicated in position 3.

0 Reparable item. When uneconomically reparable, condemn and dispose at organizational level,

F Reparable item. When uneconomically reparable, condemn and dispose at the direct support level.

H Reparable item. When uneconomically reparable, condemn and dispose at the general support level.

D Reparable item. When beyond lower level repair capability

return to &pot. Condemnation and disposal not

authorized below depot level

L Reparable item. Repair, condemnation, and disposal, not

authorized below depot/specialized repair activity level.

A Item requires special handling or condemnation procedures because of specific reasons (i.e., precious metal

content, high dollar value, critical material or hazardour material). Refer to appropriate manuals/directives

for specific instructions.

c. Federal Stock Number. Indicates the Federal

stock number assigned to the item and will be used

for requisitioning purposes.

d. Part Number. Indicates the primary number

used by the manufacturer (individual, company,

firm, corporation or Government activity), which

controls the design and characteristics of the item by

means of its engineering drawings, specifications

standards, and inspection requirements, to identify

an item or range of items. For BIIL and ITIAL, see

explanation of description column, para f.

NOTE

When a stock numbered item is requisitioned, the repair part received may

have a different part number than the

part being replaced.

e. Federal Supply Code for Manufacturer (FSCM).

The FSCM is a 5 digit numeric code listed in SB

708-42 which is used to identify the manufacturer,

distributor, or Government agency, etc. For BIIL

and ITIAL, see explanation of description column,

para f.

B-2
C4, TM 9-1290-325-12/1

f. Description. Indicates the Federal item name

and, if required, a minimum description to identify

the item. (In BIIL and ITIAL only, the following will

be used: "The last line for each item in the BIIL and

ITIAL indicates the part number with the FSCM in

parentheses’).

g. Unit of Measure (U/M). Indicates the standard of

the basic quantity of the listed item as used in

performing the actual maintenance function. This

measure is expressed by a two-character alphabetical abbreviation (e.g., ea, in, pr, etc.)

h. Quantity Furnished with Equipment (Basic

Issue Items Only). Indicates the quantity of the basic

issue item furnished with the equipment.

i. Quantity Authorized (Items Troop Installed or

Authorized Only). Indicates the quantity of the item

authorized to be used with the equipment.

j. Quantity Incorporated in Unit. Indicates the

quantity of the item used in the breakout shown on

the illustration figure, which is prepared for a

functional group. A ‘V” appearing in this column in

lieu of a quantity indicates that no specific quantity

is applicable, (e.g., shims, spacers, etc.).

N - Indicates an added item

C - Indicates a change in data

R - Indicates a change in FSN only

B-4 Special Information

Action change codes indicated in the left-hand

margin of the listing page denote the following:

B-5. How to Locate Repair Parts

a. When Federal Stock Number or Part Number Is

Unknown:

(1) First. Using the table of contents, determine

the functional group or subgroup i.e., radar chronograph and telescope within which the repair part

belongs This is necessary since illustrations are

prepared for functional groups or subgroups, and

listings are divided into the same groups.

(2) Second. Find the illustration covering the

functional group or subgroup to which the repair

part belongs

(3) Third. Identify the repair part on the

illustration and note the illustration figure and item

number of the repair part.

(4) Fourth. Using the Repair Parts Listing, find

the figure and item number noted on the illustration.

b. When Federal Stuck Number or Part Number is

Known.

(1) First. Using the Index of Federal Stock

Numbers and Part Numbers, find the pertinent

Federal stock number or part number. This index is

in ascending FSN sequence followed by a list of part

numbers in ascending alphameric sequence, crossreferenced to the illustration figure number and

item number.

(2) Second. After finding the figure and item

number, locate the figure and item number in the

repair parts lists

B-6. Abbreviations

Abbreviations Explanation

blk .................... black

clr .................... clear

cres. ................... corrosion-resistant steel

dia .................... diameter

fl ...................... flat

fnsh ................... finish

hlcl ................... helical

id ................... inside diameter

intl .................. internal

I ...................... long

lkg .................. locking

nkl ................... .nickel

NO .................... number

od ..................... outside diameter

plstc .................. plastic

psvt .................. .passivate

scr .................. screw

sp ..................... special purpose

t .................... teeth

thk .................... thick

UNC .................. unified coarse thread

UNF .................. unified fine thread

w ..................... wide

B-3
C5, TM 9-1290-325-12/1

(1)

Illustation

(a) (b)

Fig Item

No. No.

1290-804-9421

1290-804-9408

(2) (3) (4)

Federal Qty

stock Description furn

number with

Part Number & FSCM Usable on Code

CASE CARRYING M87 1

7654351 (19200)

CASE RADAR ACCESSORIES

8566361 (19200)

CONTAINER REUSABLE

8566360 (19200)

1210-765-4351

Section II. BASIC ISSUE ITEMS LIST

1

1

Section III. ITEMS TROOP INSTALLED OR AUTHORIZED LIST

(1) (2) (3) (4)

Federal Description Qty

Stock U/M Auth

No. Part Number & FSCM Usable on Code

1290-167-8311 CABLE ASSEMBLY, SPECIAL PURPOSE ELECTRICAL 1

10559174 (19200)

B-4
C4 TM 9-1290-325-12/1

Section IV. REPAIR PARTS LIST

(1)

Illustration

(a) (b)

Fig Item

No. No.

1-4

1-4

1-7

1-8

1-9

1-10

1-11

B1

B1

B1

B2

B2

B2

B2

B2

B2

B2

2.24-1

B3 1

B3 3

2.24-1

2.24-1

2.24-1

6

7

(2)

SMR

code

(3) (4)

Federal Part

stock number

number

PAOZZ 1290-179-5284 11728162

PAOZZ 5305-959-1909 MS16996-11

PAOHH

PAOHH

PAOHH

PAOZZ

1290-020-2369

1290020-2372

1290-020-2379

8215501

10512499

10512508

10525373

PAOHH 1290-863-5644 10524410

PAOHH 1290-870-3749 10525674

PAOZZ 5340-598-0994 7583435

PAOZZ 6650-764-0108 7640180

PAOZZ 1240-763-4555 7634555

PAOZZ 5961-018-3292 10525239

PAOZZ 5960-083-2786 10525462

PAOZZ

PAOZZ

5961-548-8171

5310-271-4645

10525479

MS35649-84

PAOZZ 5310-054-1830 MS35338-80

PAOZZ

PAOZZ

PAOZZ

PAOZZ

PAOZZ

PAOZZ

5305-988-7603

5960-083-2793

5305-579-5238

6210-034-0905

6210-974-3875

5310-903-5866

MS16995-27

10525618

MS35307-309

1052411-2

10531860

MS51971-1

PAOZZ 5310-543-2740

5310-582-5677

MS35333-74

PAOZZ MS15795-810

(5)

FSCM

19200

96906

19200

19200

19200

19200

19200

19200

19200

19200

19200

19200

19200

19200

96906

96906

96906

19200

96906

19200

19200

96906

96906

96906

(6)

Description

Usable on Code

SCREW. CAP, SOCKET HEAD:

CRES, PSVT FNSH. NO. 10-32UNF3A, .5/8 L

INDICATOR, DIGITAL DISPLAY:

POWER SUPPLY:

AMPLIFIER, AUDIO FREQUENCY:

AMPLIFIER, AUDIO FREQUENCY, SUBASSEMBLY:

CONTROL FREQUENCY:

AMPLIFIER, DETECTOR:

RETAINING RING:

EYESHIELD:

SUNSHADE TELESCOPE OBJECTIVE:

CAP, DIODE HOLDER:

HOLDER SEMICONDUCTOR DEVICE

DIODE:

DIODE SEMICONDUCTOR DEVICE:

TYPE 1N263

NUT, PLAIN, HEXAGON: CRES, PSV‘T

FNSH, NO. 8-32UNC-2B. 11/-32 W, 1/8

THK

WASHER, LOCK SPLIT, HLCL, CRES,

PSVT FNSH, 0.296 OD, 0.046 THK, NO.

8 SCR SIZE

SCREW, CAP, SOCKET HEAD: CRES,

PSVT FNSH, NO. 8-32UNC-3A, =5/8 L

ELECTRON TUBE KLYSTRON: PN VA 24:

SCREW, CAP, HEXAGON HEAD: CRES,

PSVT FNSH, 1/4-20UNC-2A, 1.125 L

INDICATOR LIGHT: CLR, 0.44 DIA, 1.03 L

INDICATOR LIGHT: PLSTC, SP,

BLK NKL FNSH, TYPE 101-5030-931

NUT. PLAIN, HEXAGON: CRES, PSVT

FNSH, 1/4-20 UNC-2B, 0.428 W, 0.212

THK

WASHER, LOCK: FL, INTL T, LKG 0256

ID, 0.460 OD, 0.023 THK, 1/4 SCR SIZE

WASHER, FLAT: CRES, PSVT FNSH,

0.281 ID, 0.625 OD, 0.080 THK 1/4 SCR

SIZE

DECAL:

(7)

u/m Qty

inc

i n

unit

EA 2

HD 18

EA 1

EA 1

EA 1

1

EA 1

EA 1

EA 1

EA 1

EA 1

EA 7

EA 7

EA 7

HD 1

HD 1

HD 1

EA 1

EA 2

EA 1

EA 1

EA 2

EA 2

EA 2

B-4.1
C5

This page left Intentionally Blank

B-4.2
C 4, TM 9-1290=325-12/1

Figure B-1. Telescope XM 128

B-5
C4, TM9-1290-325-12/1

Figure B-2. Wareguide assembly

B-6
C4, TM 9-1290-325-12/1

Figure B-S. Panel mounted lamp assemblies and fuses.

B-7
C4,TM9-1290-325-12/1

Figure B-4. Instrument light M53.

B-8
C4, TM 9-1290-325-12/1

Figure B-5. Radar test receiver.

B-9
C5, TM 9-1290-235-124

Section VI. INDEX

FEDERAL STOCK NUMBERS AND REFERENCE NUMBERS

CROSS REFERENCE TO FIGURE AND ITEM NUMBER

Stock Number

1240-089-1876

1240-763-4555

1240-765-4351

1290-020-2369

1290-020-2372

1290-020-2379

1290-022-9844

1290-087-5527

1290-167-8311

1290-179-5264

1290-181-5303

1290-535-7617

1290-535-7629

1290-620-0052

1290-653-7993

1290-654-5472

1290-719-7156

1290-764-1600

1290-765-4351

1290-804-9408

1290-804-9421

l290-861-7105

1290-862-0005

1290-863-3194

1290-863-3195

Text 1290-863-5644

Reference Number

MS1579S-810

MS16995-27

MS16996-11

MS25237-328

MS35307-309

MS35333-74

M535338-80

MS35649-84

MS51971-1

MS90078-11-1

81349

193145

5800940

6537993

6545472

7197156

7197188

7583435

7634555

7640180

7641600

7654351

7673015

7687114

8215501

8215513

8213855

8213856

8566360

8566361

Figure No.

1-1

B1

1-1

1-7

1-8

1-9

1-1

1-1

1-4

1-1

2-11

2-12

1-1

2-11

2-13

2-14

1-1

1-1

1-1

1-1

1-1

1-1

1-1

1-1

1-10

Mfg No.

96906

96906

96906

96906

96906

96906

96906

96906

96906

96906

21450

19200

12900

19200

12900

19200

19200

19200

19200

19200

19290

19200

19200

19200

19200

19200

19200

19200

19200

Fig. No. Item No.

2-24.1 -

B2 6

1-4 -

B3 4

2-24.1 -

2-24.1 -

B2 -

B2 -

2-24.1 5

B3 4

B4 -

B4 6

1-1 2

2-11 5

2-13 -

2-14 -

2-12 -

B1 -

B1 -

B1 1

1-1 3

1-1 2

B1 -

2-11 -

1-7 4

1-1 -

1-1 -

1-1 -

1-1 -

1-1 -

Item No.

-

3

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Stock Number

1290-870-3749

1290-937-6200

5305-579-5238

5305-959-1909

5305-988-7603

5310-054-1830

5310-271-4645

5310-543-2740

5310-582-5677

5310-903-5966

5340-598-0994

5920-583-6092

5920-892-9292

5960-083-2973

5960-083-2786

5961-018-3292

5961-548-8171

5995-949-9621

6135-120-1020

6210-034-0905

6210-974-3875

6240-155-7857

9840-581-1598

6240-635-9800

6650-764-0180

7510-889-3494

Figure No.

1-11

1-1

2-24.1

1-4

B2

B2

B2

2-24.1

2-24.1

2-24.1

B1

B3

B3

B2

B2

B2

B2

1-1

B4

B3

B3

B3

B3

B4

B1

Reference Number Mfg No.

8566401 19200

8579651 19200

8579656 19200

8579676 19200

8579669 19200

10512499 19200

10512507 19200

10512508 19200

10525235 19200

10525239 19200

10525300 19200

10525411-2 19200

10525412 19200

10525462 19200

10525479 19200

10525510 19200

10525550 19200

10525559 19200

10525618 19200

10525674 19200

10531859 19200

1053860 19200

19531933 19200

10540459 19200

10552370 19200

10553463 19200

10559174 19200

10559746 19200

11728162 19200

Fig. No.

1-1

B4

B4

B4

B4

1-8

1-1

1-9

1-1

B2

1-1

B3

B3

B2

B2

1-10

2-8

1-1

B2

1-11

B3

B3

1-1

1-1

1-1

1-1

1-1

1-4

Item No.

-

-

-

-

6

5

4

-

-

-

1

5

6

7

2

1

3

-

2

1

3

4

2

5

2

-

Item No.

-

6

1

4

3

-

-

-

1

-

1

2

2

3

-

-

-

7

-

5

3

-

-

-

-

-

-

-

B-10
TM 9-1290-325-12/1

APPENDIX C

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

C1. Scope

The maintenance allocation chart identifies

for each component and assembly of the end

item the maintenance operations that must be

performed, and assigns each of these operations to the lowest level of maintenance capable

of performing the task in terms of the availability of time, tools, test and support equip

ment, skills, and employment of the item.

C2. General

(3)

The maintenance allocation chart is divided

into four sections.

a. Section II contains definitions of the several classes of maintenance operations.

b. Section III is the maintenance assignment

portion and contains the following data elements. (4)

(1) Group number. The numerical scheme

for grouping related components and

assemblies.

(2) Component Assembly Nomenclature.

A listing of the components and assemblies applicable to the end item

and requiring maintenance. An assembly is a group of two or more physically connected or related parts which

is capable of disassembly. A component is a group of connected assemblies and parts which is capable of

operation independently, but which

may derive its power from another

source.

Maintenance Function. The assignment of each item’s maintenance operation to the lowest level of maintenance is recorded in the appropriate 

column by the maintenance level symbol “C” for operator/crew, “0” for

organizational, “F” for direct support, “H” for general support and

"D” for depot maintenance.

Tools and Equipment. A reference

code column for any special tool or

test requirement with identification in

section IV.

(6) Remarks. A reference code column for

items which have supplemental instructions in section V.

89
TM 9-1290-325-12/1

APPENDIX C

MAINTENANCE ALLOCATION CHART Date

(TM 38-715-1) 17 October 1967

Nomenclature of End Item or Component RADAR CHRONOGRAPH SET: M36

SECTION II - GENERAL

This Maintenance Allocation Chart designates overall responsibility for the performance of maintenance

functions on the identified end item or component. The implementation of field maintenance tasks upon this end

item or component will be consistent with the assigned maintenance operations which are defined as follows:

Operation

Inspect

Test

Service

Adjust

Align

Calibrate

Install

Replace

Repair

Overhaul

Rebuild

Definition

To verify serviceability and to detect incipient failure by close examination.

To verify serviceability and to detect incipient failure by use of common and special

tools and equipment such as gauges, meters, or other electrical, electronic, or mechanical devices and by operation of the material.

To clean, preserve, weigh, recharge, lubricate, perform minor adjustments, or paint

materiel and to replenish fuels, lubricants, compounds, oxygen, and air, and so forth

as appropriate.

To correct malfunctions by maintaining within prescribed limits, by bringing into

proper or exact position, or by setting the operating characteristics as to the specified

values.

To adjust two or more items or components so their functions are properly synchronized. To place or bring into line.

To determine the corrections to be made in the readings of instruments or test equipment used in precise measurement. Consists of the comparison of two instruments one

of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared with the certified standard.

To set up for use in an operational environment, such as a generator in an emplacement, a radar at a site, or a gun mount on a vehicle.

To substitute like serviceable parts, assemblies or components for other items, due to

actual or anticipated failure or malfunction.

To restore an item to serviceable condition through correction or a specific failure or

unserviceable condition.

To restore an item to a completely servieable condition as prescribed by maintenance

serviceability standards.

To restore an item to a standard as nearly as possible to original or new condition in

appearance, performance, and life expectancy. This is accomplished through complete

disassembly of the item, inspection of all parts or components, repair or replacement

of specifications subsequent reassembly of the item.

90
91 TM 1290-325-12/1

Nomenclature of End Item or Component RADAR CHRONOGRAPH SET: M36

SECTION III - MAINTENANCE ASSIGNMENT

Maintenance Function

(c)

Group No.

(a)

Component Assembly Nomenclature

(b)

InspectTestServiceAdjustAlignCalibrateInstallReplaceRepairOverhaulRebuild

Tools and Equipment

(d)

Remarks

i.O

1.1

1.1.1

1.1.2

1.1.3

1.2

1.3

1.3.1

1.3.2

1.3.3

1.4

1.4.1

1.5

1.5.1

1.5.2

1.5.3

1.6

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

1.7

1.7.1

1.7.2

1.8

1.8.1

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

1.8.7

1.8.8

1.8.9

Chronograph, Assembly ----------------------------------------

Cabinet Assembly-------------------------------------------------

Slides, Frame Assy------------------------------------------------

Fan-------------------------------------------------------------------

Air Filters-----------------------------------------------------------

Cover,Protective Antenna----------------------------------------

Panel, Assembly---------------------------------------------------

Connectors----------------------------------------------------------

Meter----------------------------------------------------------------

Switch Rotary -----------------------------------------------------

Antenna-------------------------------------------------------------

Antenna Subassembly---------------------------------------------

Waveguide Assembly---------------------------------------------

Tuner----------------------------------------------------------------

Klyston--------------------------------------------------------------

Diodes& Holders--------------------------------------------------

IF Amplifier/Phase Detector-------------------------------------

Meter----------------------------------------------------------------

Coaxial Cable------------------------------------------------------

Connectors----------------------------------------------------------

Subassembly 10525655 PCB-------------------------------------

Subassembly 10525651 PCB------------------------------------

Control, Automatic Frequency (AFC)--------------------------

Subassembly 10525468 PCB------------------------------------

Subassembly 10525469 PCB------------------------------------

Indicator, Digital Display----------------------------------------

Switch, Rotary-----------------------------------------------------

Switch, Throw-----------------------------------------------------

Connectors---------------------------------------------------------

Indicator, Digital--------------------------------------------------

Counter, Decade Frequency Dividers--------------------------

Counter, Decade Frequency Dividers--------------------------

Gate, Oscillator----------------------------------------------------

Generator, Pulse---------------------------------------------------

Amplifier, Audio/Radio Frequency-----------------------------

C

C

- - - -

- - - -

C

C

O

- - - -

- - - -

- - - -

O

- - - -

O

- - - -

- - - -

- - - -

O

- - - -

- - - -

- - - -

- - - -

- - - -

O

- - - -

- - - -

O

- - - -

- - - -

- - - -

 - - - -

- - - -

- - - -

- - - -

- - - -

- - - -

F

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

F

- - - -

O

O

O

- - - -

- - - -

- - - -

- - - -

- - - -

O

- - - -

- - - -

O

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

C

C

F

- - - -

C

C

O

- - - -

- - - -

- - - -

O

- - - -

O

- - - -

- - - -

- - - -

O

- - - -

- - - -

- - - -

- - - -

- - - -

O

- - - -

- - - -

O

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

C

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

F

- - - -

F

- - - -

O

- - - -

- - - -

- - - -

- - - -

- - - -

O

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

F

F

O

- - - -

F

F

F

F

F

H

F

O

O

O

F

F

F

- - - -

- - - -

O

- - - -

- - - -

O

F

F

F

F

F

F

F

F

F

F

F

- - - -

- - - -

- - - -

- - - -

D

- - - -

- - - -

- - - -

F

- - - -

H

- - - -

- - - -

- - - -

D

- - - -

- - - -

- - - -

F

F

F

F

F

F

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

D

D

- - - -

- - - -

- - - -

- - - -

D

- - - -

- - - -

- - - -

- - - -

- - - -

D

- - - -

- - - -

- - - -

D

- - - -

- - - -

- - - -

- - - -

- - - -

D

- - - -

- - - -

D

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

- - - -

1,2,3,5,6,7,10,

11, 12, 13, 14.

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

3, 10, 7, 12, 13, 14-

------------------------

3, 10, 7, 12,13, 14

11, -------------------

3, 10, 4, 2 -----------

------------------------

------------------------

------------------------

------------------------

------------------------

1, 10, 2---------------

------------------------

------------------------

1, 2, 4, 8, 9, ---------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

------------------------

a, b, c, d, g

a,c g

c

f

a,c,f

a,c,f

f

f

f

a, c, f,

f

a, c, d, f, g,

f

b, f

b, f

a, b, c, f, g

f

f

f

a,b, c d, f, g

a, b, c, f, g

f

f

f

f

f

f

f

f

f
92

TM 9-1290-325-12/1

Nomenclature of End Item or Component RADAR CHRONOGRAPH SET: M36

Group No.

(a)

1. 8. 10

1. 8. 11

1. 8. 12

1. 8. 13

1. 8. 14

1. 8. 15

1. 8. 16

1. 8. 17

1. 8. 18

1. 9

1.9. 1

1. 9. 2

1. 9. 3

1. 9. 4

1. 9. 5

1. 9. 5. 1

1. 9. 5. 2

1. 9. 6

1.10

1. 10. 1

1. 10. 2

1. 10. 3

1. 10. 4

1. 10. 5

2. 0

3. 0

3.1

4. 0

5. 0

6. 0

6.1

7. 0

7.1

7. 2

8.0

9.0

10.0

Component Assembly Nomenclature

(b)

Oscillator--------------------------------------------------

Generator, Gate ------------------------------------------

Indicator, Reset------------------------------------------

Oscillator, 75 KC -----------------------------------------

Gate, Delay------------------------------------------------

Crystal 95.648 KC-----------------------------------------

Crystal 75 KC -------------------------------------------

Subassembly 10525416 PCB ----------------------------

Subassembly 10549950 PCB ---------------------------

Amplifier, Audio-----------------------------------------

Connectors -----------------------------------------------

Filter, Band Pass ----------------------------------------

Filter, Low Pass-------------------------------------------

Switeh, Rotary--------------------------------------------

Amplifier, Audio-----------------------------------------

Subassembly 10525419 PCB ---------------------------

Subassembly 10525388 PCB----------------------------

Subassembly 10525389 -----------------------------

Power Supply ---------------------------------------------

Switch, Throw --------------------------------------------

Filter ----------------------------------------------------

Transformer -------------------------------------------

Subassembly 10531845 PCB ---------------------------

Subassembly 10531846 PCB----------------------------

Microphone-----------------------------------------------

Mount, Radar Chronograph --------------------------

Level Vial Assembly ---------------------------------

Tripod Assembly-----------------------------------------

Radar Test Receiver------------------------------------

Rater, Chronograph -------------------------------------

Cable Assy, Special Purpose ---------------------------

Cable Assy and Reel------------------------------------

Cable Assemblies ----------------------------------------

Reel,Cable ------------------------------------------------

Cable, Special Purpose (8566401) --------------------

Bracket, Installation (Jeep Mounting)----------------

Telescope XM128 ----------------------------------------

SECTION III-MAINTENANCE ASSIGNMENT

0

0

C

C

C

C

O

C

O

C

C

C

0

C

C

O

0

0

F

D

C

0

F

0

0

C

C

C

C

0

C

0

C

C

C

0

C

C

Maintenance Function

(c)

F

D

F

F

F

F

F

F

F

F

0

F

F

F

0

F

F

F

0

F

F

C

0

0

0

F

F

0

F 

F 

F D

F 

F I

F

F 

F 

F

F

F

F

F

F

F

F D

F D

F

F D

F D

Tools and Equipment

1, 10------------------

Remarks

f

f

f

f

f

f

f

1,4,8,10---------- a, b, c, f, g

f

f

f

a, b, c, f, g

f

f

f

a, b, c, f

a, c, f, g

a, c, f

a, c, f, g

a, b, c, f, g

a, b, c, f, g

a, c, f

a, c, g

a, b, c, f

a, c, f

a, b, c,

a, c, g,

a, b, c, f, g
C 3, TM 9-1290-325-12/1

93

c

Tools and Equipment Remarks

d e

10.1 C a,c

10.2 C a,c

10.3 C a,c

10.4 C a,c

10.4.1 C a,c

11.0 C a,cr,f

12.0

13.0

14.0

Component Assembly

b

Eyeshield

Sunshade

Case, Carrying M87

Light, Instrument, M53

Bracket, Lamp Assy

Adapter Assembly

Generator Set, gasoline engine driven, 0.5

kw, AC, 120/240 volts, 400 Hertz, 1 PH,

Model HF-0.5 MD

Trailer, Cargo, 1/4 Ton Two-Wheeled

M100

Truck, Utility, 1/4 Ton 4x4, M151A1

C

C

C

C

C

C

Maintenance Function

O

O

O

O

O

O F

Stock Item

Stock Item

Nomenclature of End Item or Component RADAR CHRONOGRAPH SET: M36

Section III. MAINTENANCE ASSIGNMENT
C .3, TM 9-1290-325-12/1

94

Tool or Test Tool Number

Reference Code

Maintenance Nomenclature FSN

category

1.

2.

3.

4.

5.

6.

7.

O, DS, GS, D Tool Kit, Radar & Radio Repairman, TK87/U 5180-690-4452

DS, GS, D Oscilloscope Type AN/USM-50A 6625-668-4676

DS, GS, D Frequency Meter FR-126/U 6625-787-6248

DS, GS, D Voltmeter, Electronic Type ME-30 A/U 6625-669-0742

DS, GS, D Crystal Detector Mount 440A 6625-581-5802

DS, GS, D Multimeter TS-352/U 6625-242-5023

DS, GS, D Attenuator 20db Variable, Hewlett-Packard X375A; 4931-604-3855

8. DS, GS, D

9. DS, GS, D

10. DS, GS, D

11. DS, GS, D

12. DS, GS, D

13. DS, GS, D

14. DS, GS, D

15. GS, D

16. GS, D

17. GS, D

8.2-12.4 KMC or equivalent

Signal Generator 150 AN/USM 44

Signal Generator TS-382 D/U

Vacuum Tube Voltmeter TS-505/U

Test Set, Crystal Unit Rectifier TS-268/U

Wattmeter AN/URM 98

Adapter, Waveguide HPX281A

Thermistor Mount 487B

Transistor Testor AN/USM-136

Test Set Electrics System

Instrument Light Tester

6625-669-4031

6625-192-5094

6625-243-0562

6625-188-5851

6625-566-4990

5928-553-6082

6625-656-2454

4931-991-6793

4931-863-5650

4931-536-5558

Nomenclature of End Item or Component RADAR CHRONOGRAPH SET: M36

Section IV. TOOL AND TEST EQUIPMENT REQUIREMENTS
TM 9-1290-325-12/1

Nomenclature of End Item or Component RADAR CHRONOGRAPH SET: M36

Reference Code

a

b

c

d

e

f

g

SECTION V REMARKS

Remarks

Inspection. The inspection function of verifying serviceability of the Radar Chronograph Set is allocated to the operation. Inspection of components of the Radar Chronograph is allocated to organizational support

Test. Self-test of the Radar Chronograph is accomplished by organizational support

By means the self-test features, i.e, internal and external monitor meters, use of the

chronograph rater, microphone, test receiver, and troubleshooting guide, malfunctioning

modules can be detected. module testing is completed at the direct support level utilizing

test equipment allocated at that level.

Service. The service function relates primarily to the periodic application of preventive

maintenance service included in the Preventive Maintenance Tables.

Adjust. The operator adjusts the leakage control through use of knobs and associated

monitor meter externally located on the chronograph. Organizational Support per

forma adjustment of Potentiometer A2R16 on the A2 Frequency (AFC), and adjusts

Potentiometer A4R27 for modulator drive on the A4 IF Amplifier Detector utilizing the internal monitor meter.

Replace. All Radar Chronograph modules and assemblies are replaced as indicated by

the Maintenance Allocation Chart.

Repair. Repair function is assigned to direct support, general support and depot as

indicted by the Maintenance Allocation Chart This repair includes replacement of

tools and test equipment allocated at these levels.

defective components of assemblies and sub-assemblies which involves use of specialOverhaul. Overhaul function is allocated at depot level.

95

C 3, TM 9-1290-325-12/ 1

INDEX

Paragraph Page

Accidents, field report (see forms, records and reports)

Accessories, installation of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessories, transit case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adapter assembly

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Administrative storage instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AGC V check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Aiming:

Common aiming point procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reciprocal laying procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Aiming post M1A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Aiming post light M14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation of. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air filters cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Allocation chart, maintenance (see Maintenance Allocation Chart)

Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audio amplifier gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Authorized forms (see forms, records and reports)

Auxiliary feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Basic Issue Items List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Basic operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Blast effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8a

Bracket lamp assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bracket, installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bracket valve, transit case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cable assembly and reel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cargo, trailer M100 (see operation of materiel used in conjunction with

radar chronograph set)

Carrying case, telescope MB7 (see telescope carry case M87)

Chronograph set (see Radar Chronograph set M96)

Chronograph test receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chronograph transit case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning (see preventive maintenance services)

Cleaning for shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3d

Common tools and equipment (see repair parts, tools and equipment)

Controls :

Chronograph

Adjustment, Leakage 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control, Microphone Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, Cal 1-Oper-Cal 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, Delay selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, internal monitor selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, Monitor Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, Reset pushbutton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switch, Velocity selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3d 19

4-3c 60

1-4g 11

2-14.1 43

3-24 57

4-2 59

2-9 33

2-10a 39

2-10b 39

T-2-1 26

2-16 44

2-16 44

3-5d 47

1-3c

3-24

3-24

1-4a 8

2-3b (5) 17

App “B”

1-3b

1-4e

2-15

1-4f

2-3a(2)

1-4b

2-9

B-1

3

33

9

44

11

17

9

33

1-4d 9

4-3b 59

2-9a(5)

2-9a(3)

2-9a(11)

2-9d(1)

2-9a(4)

2-9a(3)

2-9a(2)

2-9a(9)

2-9a(6)

5

57

57

60

35

35

36

37

35

35

35

35

35

97
C 3, TM 9-1290-325-12/1

Paragraph Tripod : Page

Handles, lock, leveling base. . . . . . . . . . . . . . . . . . . . . . . . .

Knobs, hand, leg, clamp. . . . . . . . . . . . . . . . . . . . . . . . .

2-3b(7)

Knob, spider assembly . . . . . . . . . . . . . . . . . . . . . . . . .

2-3b(6)

Latch, stay rod. . . . . . . . . . . . . . . . . . . . . . . . .

2-3b(3)

Mount:

18

18

17

2-3b(2) 17

Dial pointer azimuth deflection. . . . . . . . . . . . . . . . . . . . . . . . .

Handle, lock elevation

2-3b(11)

Handle, lock base

. . . . . . . . . . . . . . . . . . . . . . . . . 2-3b(12)

. . . . . . . . . . . . . . . . . . . . . . . . .

Knob, lock, azimuth deflection. . . . . . . . . . . . . . . . . . . . . . . . .

2-3b(7)

Crystal current tests

2-3b(11)

. . . . . . . . . . . . . . . . . . . . . . . . . 3-25

19

19

18

19

57

Data, tabulated (see tabulated data)

Delay switch (see Controls)

Demolition . . . . . . . . . . . . . . . . . . . . . . . . .

Description and data, general. . . . . . . . . . . . . . . . . . . . . . . . .

Destruction of materiel. . . . . . . . . . . . . . . . . . . . . . . . .

Digital indicators . . . . . . . . . . . . . . . . . . . . . . . . .

Doppler principle . . . . . . . . . . . . . . . . . . . . . . . . .

Elevation dial pointer adjustment. . . . . . . . . . . . . . . . . . . . . . . . .

Elevation level adjust drive knob . . . . . . . . . . . . . . . . . . . . . . . . .

2-10a(19)

Elevation leveling lock handle. . . . . . . . . . . . . . . . . . . . . . . . .

2-3b(13)

Eyeshield, telescope. . . . . . . . . . . . . . . . . . . . . . . . .

4-4

1-3

4-4

2-9a(9)

1-3b

64

3

64

35

3

39

19

2-3b(12) 19

3-5c 47

Feet, auxiliary (see auxiliary feet)

Filter, aiming post light. . . . . . . . . . . . . . . . . . . . . . . . .

Filters, air (see air Alters)

Fire Control Materiel

2-16 44

Aiming circle M2. . . . . . . . . . . . . . . . . . . . . . . . .

Aiming post M1A2. . . . . . . . . . . . . . . . . . . . . . . . .

Aiming post light M14. . . . . . . . . . . . . . . . . . . . . . . . .

Fire control quadrant M1A1. . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument light M53. . . . . . . . . . . . . . . . . . . . . . . . .

Installation of . . . . . . . . . . . . . . . . . . . . . . . . .

Telescope, straight XM128. . . . . . . . . . . . . . . . . . . . . . . . .

Forms, records and reports

2-10c 41

2-9a(4) 35

2-18 44

2-17 44

1-4e 9

2-15 44

1-3j 7

Authorized forms . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment improvement recommendation . . . . . . . . . . . . . . . . . . . . . . . . .

Field report of accidents . . . . . . . . . . . . . . . . . . . . . . . . .

Materiel failure report. . . . . . . . . . . . . . . . . . . . . . . . .

Frequency of radar signal . . . . . . . . . . . . . . . . . . . . . . . . . 3

Fuse holders. . . . . . . . . . . . . . . . . . . . . . . . .

Fuse replacement. . . . . . . . . . . . . . . . . . . . . . . . .

Gaskets. . . . . . . . . . . . . . . . . . . . . . . . .

General description of radar chronograph set M36 and associated equipment:

3-5c

Description . . . . . . . . . . . . . . . . . . . . . . . . .

Basic principles . . . . . . . . . . . . . . . . . . . . . . . . .

General. . . . . . . . . . . . . . . . . . . . . . . . .

Generator set HF-0.5 MD . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2a

1-2b

1-2d

1-2e

1-3b

T-2-1

3-21

3

3

3

3

23

55

47

1-3 3

1-3b 3

1-3a 3

2-14c 43

1-4j 11

2-9a(2) 35

2-9a (9) 35

2-3f 20

Identification plates. . . . . . . . . . . . . . . . . . . . . . . . .

Indicator light Power. . . . . . . . . . . . . . . . . . . . . . . . .

Indicator light Reset. . . . . . . . . . . . . . . . . . . . . . . . .

Inspection . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument light M53

Description . . . . . . . . . . . . . . . . . . . . . . . . .

Installation . . . . . . . . . . . . . . . . . . . . . . . . .

Internal monitor selector switch. . . . . . . . . . . . . . . . . . . . . . . . .

Internal monitor meter. . . . . . . . . . . . . . . . . . . . . . . . .

Latch, mount lock handle. . . . . . . . . . . . . . . . . . . . . . . . .

Latch, tripod stay rod . . . . . . . . . . . . . . . . . . . . . . . . .

1-4e 9

2-15 44

2-9a(6) 35

2-9a(7) 35

2-3b(12) 19

2-3b(2) 17

98
TM 9-1290-325-12/1

Paragraph

2-9a(5)

2-3b(6)

2-3b(7)

2-3b(15)

Page

35

18

18

19

Leakage adjustment 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . .

Leg clamp knobs. . . . . . . . . . . . . . . . . . . . . . . . .

Leveling, lock base handles. . . . . . . . . . . . . . . . . . . . . . . . .

Leveling vials mount. . . . . . . . . . . . . . . . . . . . . . . . .

Light, aiming post M14 (See aiming post light M14)

Light instrument M53 (See instrument light M53)

Lubrication and painting

General lubrication instruction. . . . . . . . . . . . . . . . . . . . . . . . .

Painting. . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance general. . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance allocation . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance allocation chart. . . . . . . . . . . . . . . . . . . . . . . . .

23-e, 3-3 20, 47

3-4 47

3-8, 3-23 49,56

1-1b 3

App “C” 89

Maintenance Instructions

Common tools and equipment . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Repair parts . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Special tools and equipment. . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Microphone

Connection. . . . . . . . . . . . . . . . . . . . . . . . . 1-4c

Description . . . . . . . . . . . . . . . . . . . . . . . . . 1-4c 9

Mixer crystal current tests . . . . . . . . . . . . . . . . . . . . . . . . . 3-25

Modulator crystal current tests. . . . . . . . . . . . . . . . . . . . . . . . . 3-25a

Modulator drive adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 3-25b 57

Monitor meter . . . . . . . . . . . . . . . . . . . . . . . . . 2-9a(4) 35

Monitor selector switch . . . . . . . . . . . . . . . . . . . . . . . . . 2-9a(3)

Mount radar chronograph . . . . . . . . . . . . . . . . . . . . . . . . . 1-3i

Muzzle velocity . . . . . . . . . . . . . . . . . . . . . . . . . 1-3b

Night operation . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Operation. . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Operation of materiel used in conjunction with radar chronograph set

General . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Generator set., HF-0.5 MD . . . . . . . . . . . . . . . . . . . . . . . . . 2-14c

Trailer, cargo, M100 . . . . . . . . . . . . . . . . . . . . . . . . . 2-14b

Truck, utility, M151 . . . . . . . . . . . . . . . . . . . . . . . . . 2-14a

Operation under unusual conditions. . . . . . . . . . . . . . . . . . . . . . . . . 2-18

General . . . . . . . . . . . . . . . . . . . . . . . . . 2-18a

Operation in dusty or sandy conditions. . . . . . . . . . . . . . . . . . . . . . . . . 2-22

Operation in extreme cold. . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Operation in extreme heat. . . . . . . . . . . . . . . . . . . . . . . . . 2-20

Operation in high humidity. . . . . . . . . . . . . . . . . . . . . . . . . 2-21

Operation under usual conditions . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Common aiming point procedure . . . . . . . . . . . . . . . . . . . . . . . . . 2-10a

Care in handling . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Correlation of chronograph with weapon . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Optical system alinement . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Check . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Packing and marking instructions . . . . . . . . . . . . . . . . . . . . . . . . . 4-3g

Pin, quick release (See Quick release pin)

Post, aiming M1A2 (See Aiming post M1A2)

Power indicator lamp replacement . . . . . . . . . . . . . . . . . . . . . . . . . 3-20 55

Power switch . . . . . . . . . . . . . . . . . . . . . . . . . 29a(2) 35

Operational checks and adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 33

Preparation for shipment. . . . . . . . . . . . . . . . . . . . . . . . .

2-9

4-3a 59

Preparation for use . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 33

General . . . . . . . . . . . . . . . . . . . . . . . . .

Setting up . . . . . . . . . . . . . . . . . . . . . . . . . 2-8b

47

47

47

9

57

57

35

6

3

48

33

42

43

43

43

45

45

46

45

46

46

32

39

32

39

43

43

43

63

2-8a 33

33

99
TM 9-1290-325-12/1

Paragraph Page

Reciprocal laying procedures . . . . . . . . . . . . . . . . . . . . . . . . . 2-10b 39

Prevetive maintenance service

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . 48

Services . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

3-6 48

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 47

Air filters . . . . . . . . . . . . . . . . . . . . . . . . 3-5d 47

General precautions in cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 3-5f 47

Glass and plastic surfaces . . . . . . . . . . . . . . . . . . . . . . . . . 3-5e 47

Metal parts . . . . . . . . . . . . . . . . . . . . . . . . . 3-5b 47

Paint and finish . . . . . . . . . . . . . . . . . . . . . . . . . 3-5g 48

Rubber parts . . . . . . . . . . . . . . . . . . . . . . . . . 3-5c 47

Quadrant, M1A1 (See Fire control metarial)

Radar chronograph set M36 . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 3

Basic principles . . . . . . . . . . . . . . . . . . . . . . . . . 1-3b 3

Description . . . . . . . . . . . . . . . . . . . . . . . . . 1-3a 3

Radar chronograph 10525300 . . . . . . . . . . . . . . . . . . . . . . . . . 1-3c 5

Reciprocal laying. . . . . . . . . . . . . . . . . . . . . . . . . 2-10b 39

References . . . . . . . . . . . . . . . . . . . . . . . . . App “A" 67

Repair of radar chronograph set M36 . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 53

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 3-21 55

Crystal current test . . . . . . . . . . . . . . . . . . . . . . . . . 3-25 57

General. . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Inspection. . . . . . . . . . . . . . . . . . . . . . . . . 3-26

53

57

Repair parts kits . . . . . . . . . . . . . . . . . . . . . . . . . 1-4g 11

Tools and Equipment for operation and organization maintenance

Tools and equipment . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Repair parts . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Reset indicator lamp replacement. . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Reset indicator light. . . . . . . . . . . . . . . . . . . . . . . . . . 2-9a(9)

55

Reset switch . . . . . . . . . . . . . . . . . . . . . . . . . 2-9a(12)

Reticle light . . . . . . . . . . . . . . . . . . . . . . . . . 1-4e

Reticle telescope . . . . . . . . . . . . . . . . . . . . . . . . . 1-4c

scale, azimuth deflection . . . . . . . . . . . . . . . . . . . . . . . . . 1-3c

Scale elevation . . . . . . . . . . . . . . . . . . . . . . . . . 1-3i

Serial number information and identification

Chronograph . . . . . . . . . . . . . . . . . . . . . . . . . 1-3a

Mount . . . . . . . . . . . . . . . . . . . . . . . . . 1-3i

Tripod . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Service upon receipt of materiel

Duties . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Service . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Shipment and storage

Administrative storage instructions

Inspection in administrative storage . . . . . . . . . . . . . . . . . . . . . . . . . 4-2c 59

Storage procedure . . . . . . . . . . . . . . . . . . . . . . . . . 4-2b 59

Time limitations. . . . . . . . . . . . . . . . . . . . . . . . . 4-2a 59

General . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 59

Shipping instructions . . . . . . . . . . . . . . . . . . . . . . . . . 4-3a 59

Special tools and equipment (See repair parts, tools and equipment)

spider adjustment knob . . . . . . . . . . . . . . . . . . . . . . . . . 1-4a

Stay rod latch assembly . . . . . . . . . . . . . . . . . . . . . . . . . 2-3b(2)

Storage instructions administrative . . . . . . . . . . . . . . . . . . . . . . . . . 4-2c

Table

2-1 Controls and instruments . . . . . . . . . . . . . . . . . . . . . . . . .

2-2 Delay setting . . . . . . . . . . . . . . . . . . . . . . . . .

2-5

2-9

3-1 Preventive maintenance and services. . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3-2 Prevetive maintenance checks and services . . . . . . . . . . . . 3-6

3-3 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

47

47

36

36

9

9

5

6

3

6

8

17

17

8

17

69

22

33

48

48

49

100
TM 9-1290-325-12/1

Paragraph

Tabulated Data

Bracket installation (jeep mounting) 8215513. . . . . . . . . . . . . . . . . . . . . . . . .

Cable and reel assembly 8213855. . . . . . . . . . . . . . . . . . . . . . . . .

Case accessories radar chronograph 8566361 . . . . . . . . . . . . . . . . . . . . . . . . .

Case, carrying M87 . . . . . . . . . . . . . . . . . . . . . . . . .

Chronograph radar 10525300 . . . . . . . . . . . . . . . . . . . . . . . . .

Container, reusable 8566360. . . . . . . . . . . . . . . . . . . . . . . . .

Light instrument M53 . . . . . . . . . . . . . . . . . . . . . . . . .

Microphone 10531933 . . . . . . . . . . . . . . . . . . . . . . . . .

Mount chronograph radar 10512507 . . . . . . . . . . . . . . . . . . . . . . . . .

Telescope, straight XM128 . . . . . . . . . . . . . . . . . . . . . . . . .

Tripod assembly 8213856 . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver, test. radar . . . . . . . . . . . . . . . . . . . . . . . . .

Telescope XM128

Description . . . . . . . . . . . . . . . . . . . . . . . . . 1-3j

Installing . . . . . . . . . . . . . . . . . . . . . . . . . 2-3d

Test (See crystal current test)

Tool List . . . . . . . . . . . . . . . . . . . . . . . . .

Trailer, cargo M100 . . . . . . . . . . . . . . . . . . . . . . . . .

Transit cases . . . . . . . . . . . . . . . . . . . . . . . . .

Tripod . . . . . . . . . . . . . . . . . . . . . . . . .

Decription . . . . . . . . . . . . . . . . . . . . . . . . .

Setup . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting

General . . . . . . . . . . . . . . . . . . . . . . . . .

Scope . . . . . . . . . . . . . . . . . . . . . . . . .

Truck, Utility M151 (See Utility truck M151)

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . 2-3a

Utility truck M151

Description . . . . . . . . . . . . . . . . . . . . . . . . .

Setup . . . . . . . . . . . . . . . . . . . . . . . . . 2-3c

Vehicle mounting bracket (See Bracket installation (jeep mounting))

Vials, leveling (See Leveling vials)

Voltage Checks (See pre-operating checks and adjustment)

1-4f 11

1-4b 9

2-3a(1) 17

1-3j 7

1-3c 5

2-3a(1) 17

1-4d 9

1-4c 9

1-3i 6

1-3j 7

1-4a 8

1-4d 9

App “B” 71

2-14b 43

2-3a(1) 17

1-4 8

1-4a 8

1-4b 9

3-8

3-9

2-14a

Page

7

19

49

49

17

43

19

101
TM 9-1290-325-12/1

By Order of the Secretary of the Army:

HAROLD K. JOHNSON,

General, United States Army,

Official: Chief of Stuff.

KENNETH G. WICKHAM

Major General, United States Army,

The Adjutant General

Distribution:

To be distributed in accordance with DA Form 12-41, Organizational Maintenance for Radar Chronograph

Set.

102

TM 9-1290-325-12/1 RADAR

PIN: 027341-000