NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

0201-20-2301 February 1, 1954 3094

Addenda

to

Instruction Book

for

Transmissometer Set

AN/GMQ-10

Prepared by

Photometry and Colorimetry Section

Optics and Metrology Division

For

Airborne Equipment Division

Bureau of Aeronautics

Department of the Navy

Washington 25 f D. C.

<NBS>

U. S. DEPARTMENT OF COMMERCE

NATIONAL DUREAU OF STANDARDS

The publication, r< Approved for public release by the

unless permission i Director of the National Institute of

25 ,d.c. Such pe standards and Technology (NIST)

cally prepared If t on October 9, 2015

In part, Is prohibited

landards, Washington

sport has been speclfleport for Its own use.

TABLE CF CONTENTS

Foreword

Addendum 1

Addendum 2a

Addendum 2b

Addendum 3

Addendum 4

Addendum 5

Addendum 6

Transmissometers for Use With Commercial

(60-cycle) Power Only.

Recorder With Synchronous-Motor Drive and

Induction-Motor Rewind (Esterline-Angus

Drive Series No. 90) and With Series 400

Meter Movement.

Recorders With Synchronoi s-Motor Drive and

With Series 321 Meter Movement.

Transmissometers With Special Projectors*

For Transmissometers With Baselines Other

Than 500 Feet.

Five-Milliampere Indicators.

Modification of Indicator to Permit Direct

Operation of Pulse Amplifier.

AO-1

Al-1

A2a-1

A2b-1

A3-1

A4-1

A5-1

A6-1

A0-2
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Addendum 1 To Instruction Book for Transinissometsr Set AN/GMQ-19

Transmissometers For Use With Commercial (63-cycle) Power Only

Whan transmissometers are to be operated only with power supplied

from commercial lines or other stable 60-cycle sources, the use of

frequency-compensated voltage-regulating transformers and the CALIBRATION SETTING meters is unnecessary. In such cases a standard voltageregulating transformer may be used; the CALIBRATION SETTING meters may

be omitted and a fixed calibration setting of 90 used. When this is

the case, make the following changes in the manual. Sheets 2 to 7 may

be discarded after the appropriate changes have been made.

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Addendum 1 (cont.)

Paragraph 1-3.2., line 3: Delete "frequency-compensated",

Figures 1-9 and 1-10: Mark vibrating reed meter on right "omitted".

Paragraph 1-3,5.* line 4: Delete "frequency-compensated".

Paragraph 1-3, 5. 3., line 1: Delete "frequency-compensated".

Paragraphs 1-4. 2. f (1), 1-4.2. l.e, 1-4, 2, 2. d, 1-4. 2. 3. c: Change to

read "60 cycles" instead of "60 ± 3 cycles".

Figure 1-12: Mark "Not applicable,."

Paragraph 3-3.2. l. t line 3: Delete "i3'%

Paragraph 3-3. 2. 2.* line 3: Delete "±3".

Figure 3-5, Note A: 5ubstitute"60" for "57-63",

Figure 3-6, Note A: Substitute "60" for "57-63",

Figure 3-11: Mark CALIBRATION SETTING meter"omittecP*and delete

reference thereto.

Paragraph 3-8. 2.

b

? line 9: Substitute "a reading of 90" for "the

correct calibration setting". Delete sentences beginning "The

correct —." and "If two —."

Paragraph 3-8,3.

c

t line 6: Insert "90" after "meter reads" and delete

the remainder of the sentence.

Paragraph 3-8. 3. e, line 6: Delete "agree with thtf Hading *of the CALs»

M3KATIUN SETTING J^ter’’ ag. read Vu

line 10: Delete "readings agree" and insert

"reading is 90".

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Addendum I (cont.)

Paragraph 4-2. 2. 2.: Delete entire paragraph.

Paragraph 4-2.2. 6., line 5: Delete ’’and the CALIBRATION SETTING

meter 0.1202)”.

Paragraph 4-3.4., line 19: Substitute "are 90" following "recorder

readings" for remainder of sentence.

Paragraph 4-3.4. 1. : Delete entire paragraph.

Figure 4-1. : Delete.

Paragraph 5-4.1., line 3: Delete "frequency-compensated”.

Paragraph 5-4.2.: Delete remainder of paragraph beginning with

"To compensate --

Figure 5-2: Change "57-63 cps" to read "60 cps".

Figure $«3af: Change "57-63 cps" to read "60 cps".

Figure 5-4Mark "Not applicable in all details.

Figure c: c * u . Change "57—'3 cps" to "(SO cps".

Table 5-1: Change entries in colu::ms to read as

4.3 116 4.0

5.4 115 5.3

6.0 115 5.8

6.6 1.14 6.4

7.2 113 6.8

if

follows

45

65

90

120

150

"This change is not applicable to transmi s some ter s with special projectors. See entries in Addendum 3.

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Addendum 1 (cont.)

Figure 5-10: Delete M102 and reference thereto*

Figure 5-11: Change ”57-63 cps” to "60 cps".

Paragraph 5-6.6., line 24 in 2nd column: Delete remainder of paragraph

beginning with "When the line frequency

Figure 5-12: Change "57-63 cps" to "60 cps". Change "57-63 pulses

per second" and "11-13 pulses per second" to "60 pps" and "12 pps".

Figure 5-17: Delete M202 and reference thereto.

Figure 5-18: Change "57-63 cps" to "60 cps".

Figure 5-19: Change "57-63 cps" to "60 cps" ( all entries). Change

"57-63 pulses per second" and "11-13 pulses per second" to "60 pps"

and ’12 pps".

Paragraph 6-1. 3. 3., line 20: Delete "of vibration of the reeds in

the CALIBRATION SETTING meter and".

Paragraph 6-1. 3. 4., line 1 in 2nd column: Delete "vibration of the

reeds of the CALIBRATION SETTING meter" and substitute "a glow of

tube V207".

Paragraph 6-2.3. 5., line 5: Delete "and the CALIBRATION SETTING

meter (M1Q2)**.

Paragraph 6-2. 3. 6.: Delete entire paragraph.

Paragraph 6-3. 4,4, , line 12: Insert "reads 90" after "meter (M1Q1)"

and delete remainder of paragraph.

Paragraph 6-3.5. 1., line 15: Delete "agree with the CALIBRATION SETTING meter" and substitute "read 90".

line 17: Delete reference to paragraph 4-3.4. 1.

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Addendum 1 (cont.)

Paragraph 6-3. 5. 3. d, line 4: Substitute "of approximately 13” for

”one-fifth the calibration setting”.

Note, line 3: Substitute ”13” for ”one-fifth of

the calibration setting".

Paragraph 6-5.3., Calibration, line 4: Substitute ”90” for "the

CALIBRATION SETTING reading”.

Paragraph 6-5.4., Calibration, line 5: Substitute "90” for "the

indication cf the CALIBRATION SETTING meter”.

Paragraph 6-7.2. i.c, line 4: Delete "the calibration setting reading obtained from the CALIBRATION 'blsi^vtPK *raeter" and . substitute " **.

line 10: Substitute ”90” for "agree with the

calibration setting”.

Paragraph 6-7. 3. 2. p, line 4: Substitute "90" for "the calibration

reading obtained from the CALIBRATION SETTING meter”.

line 10: Substitute ”90” for "agree with the

calibration setting”.

Paragraph 7-1.^., page 7-4: Delete reference to M202 (CALIBRATION

SETTING meter).

Paragraph 7-2.2., Step 2: Substitute "tube V107 glows" for "one or more reeds of CALIBRATION SETTING meter vibrate".

Delete "line frequency”. Add "V106" to Probable

Failures.

Step 7: Delete "57-63 cps”.

Step 21: Substitute "tube V207 glows” for "one or more reeds of CALIBRATION SETTING meter vibrate”. Add”V206”to

Probable Failures.

Step 30: Delete "one or more reeds of CALIBRATION

SETTING meter vibrate” and associated Probable Failures. Add "S104”

to Failures opposite "V107 glows".

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Addendum 1 (cont 8 )

Step 48: Substitute "90" for "to agree with

CALIBRATION SETTING meter reading".

Step 49: Substitute "12 pps" for "one-fifth line

frequency".

Step 50: Substitute "90" for "to agree with

CALIBRATION SETTING meter reading".

Paragraph 7-3.5.10.: Delete "or frequency" under Probable Cause.

Delete second and third sentences under Remedial or Corrective Procedure.

Paragraph 7-3.5.11.: Delete all of second Probable Cause except "S203".

Paragraph 7-3.5.15.: Delete first Probable Cause and Remedial or Corrective Procedure.

Figures 7-12 and 7-13: Mark meter M102 "not used" and delete references thereto.

Figures 7-14 and 7-15: Mark meter M202 "not used" and delete references thereto.

Figure 8-1: Delete "57-63 cps" following ’SUPPLY VOLTAGE' and enter

"60 cps".

Change entries in TEST VOLTAGES table to read as follows: *

Position of Volts Between Volts Between

LAMP VOLTS

Switch

Terminals 7 & 8 Terminals 11 & 12

4.8 4.8 116

5.4 5.3 115

6.0 5,8 115

6,

6

6.4 114

7.2 6.8 113

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Addendum 1 (cont.)

Figure 8-1 cont.: In T3Q1 block delete ”57-63 cps" and insert "60 cps".

Delete "infinite ohms" and insert "2.6 ohms"; delete '1.2 ohms" and

insert "2.0 ohms". 44

*These values are not applicable to transmissometers with special

projectors. See entries in Addendum 3.

Figure 8-2: Delete "57-63 cps" following 'SUPPLY VOLTAGE?' and enter

"60 cps".

Mark meter M102 "Not used".

Figure 8-3: Delete "57-63 cps" following 'SUPPLY VOLTAGE?’ and enter

"60 cps".

Mark meter M202 "Not used".

In T202 block delete "57-63 cps" and enter "60 cps".

Delete "infinite ohms" and enter " 2. 6 ohms"; delete "1.2 ohms" and

insert "2.0 ohms".

Figure 8-5: Mark meter M102 "Not used".

Figure 8-6: Mark meter M202 "Not used".
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Addendum 2a

To Instruction Book for Transmissometer Set AN/GMQ-10

Recorder With Synchronous-Motor Drive and Induction-Motor Rewind

(Esterline-Angus Drive Series No. 90) and With Series 400 Meter Movement.

The chart drives of these recorders require no winding for either

the chart drive or the rewind drive. For detailed instructions see Esterline-Angus Instructions Nos, 253-cc and 648-M, supplied with the

transmissometer.

Make the following changes in the manual. Note: When a paragraph

is marked ’’See Addendum 2a", reference is made to a paragraph in this

addendum bearing the same paragraph number as the original paragraph.

Sheets 3 to 5 may be discarded after the appropriate changes have been

made.

Paragraph 3-8.4. l.b: Remove the chart rewind roller by pressing down on

the clips at each end and pulling the roller forward. Remove the arbor

which is used to hold the new chart by lifting up and pulling forward.

Insert arbor through core of new roll and replace the arbor so that the

time figures are at the left.

Paragraph 3-8.4. l.d: Replace the chart rewind roller. Keeping the gear

end to the left, push in until the roller snaps into place. Insert the

end of the chart into the slot in the roller. Release the rewind catch

by operating the roller like a window shade and allow the chart to wind

on the roller.

Paragraph 3-8.4. l.e: If a chart is already in place on the roller, re- move it by first removing the end wheel on the right side of the roller

and slipping the chart off with a twisting motion.

Paragraph 4-2. 3. 5.: These change gears will be found on a holder

located to the left of the scale plate. This holder may be removed

by pulling it out of its friction-fitted mount.

Paragraph 6-6.3. l.b: Remove the flat plate carrying the charting instructions to gain access to the bearings behind it. Place one or two

drops of oil on these bearings. Do not oil the synchronous motor.

Replace the cover.

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Addendum 2a (cont.)

Paragraph 6-6.3. l.c: Unwind the rewind take-up spring by letting the

roller revolve slowly. Remove the four screws holding the cover of the

rewind mechanism. Place one or two drops of oil on the shaft bearings

and on the gears. Replace the cover.

Paragraph 6-6.3. l.d: Place a drop of oil on the bearings of the chart

arbor and the rewind roller.
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Addendum 2a (cont.)

Paragraph 1-4. 2. 3. d, line 10: Delete '’clock driven" and insert"motor

driven with motor -driven chart rewind".

Paragraph 3-0.4. l.b: Mark "Not applicable., see Addendum 2a."

Paragraph 3-8.4. l.c, last line: Change "stick" to "roller".

Paragraph 3-8.4. l.d: Mark "Not applicable, see Addendum 2a."

Note, line 2: Change "stick" to "roller".

Paragraph 3-8.4. l.e: Mark "Not applicable .

see Addendum 2a,"

Figure 3-16: Mark "Not applicable in all details.”

Figure 3-18: Mark "Not applicable in all details.”

Paragraph 3-8. 4. 3., line 3: Delete remainder of paragraph following

"by means of" and insert "a synchronous motor driving the chart and an induction motor driving the rewind mechanism. No winding is required."

Paragraph 3-8. 4. 3. a: Delete entire paragraph including the Note.

Paragraph 3-8. 4. 3. d: Delete "control" and insert "switch".

Delete "START" and insert "ON".

Delete second sentence.

Paragraph 4-2. 3. 4.: Delete "control lever" and insert "switch".

Delete second sentence.

Paragraph 4-2.3. 5., line 7: Delete remainder of sentence beginning with

"and will" and insert "See Addendum 2a."

Figure 4-3: Mark "Not applicable."

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Addendum 2a (cont.)

Paragraph 4-4*4. a: Delete "control lever" and insert "switch".

Delete "STOP" and insert "OFF".

Paragraph 5-8.2,, line 12: Change to read"35,000 ohms."

Paragraph 5-8.4. f line 2: Delete "spring-powered clock" and insert

"synchronous".

Delete entire second sentence,

line 12: Delete "spring-driven" and insert "motor-driven".

Paragraphs 6-6,3, l.b, c, d: Mark "Not applicable, see Addendum 2a.?

Paragraph 6-6.3. l.e: Delete entire paragraph.

Paragraph 6-6,3. 2.: Delete entire paragraph.

Paragraph 6-7. 3. 2. f: Delete entire paragraph.

Paragraph 7-3, 6,1. : Delete second Probable Cause and corresponding

Remedial or Corrective Procedure.

Paragraph 7-3. 6»2,: Under Probable Cause, change to "Power-line frequency

not properly regulated.? Under Remedial or Corrective Procedure, delete

entire paragraph. Under Probable Cause add "Defective or ’dragging'

motor.? Under Remedial or Corrective Procedure add "Replace."

Paragraph 7-3, 6. 3.: Delete second sentence of second Probable Cause

(beginning "See that

Delete third Probable Cause "Reroll spring unwound"

and the corresponding Corrective Procedure, Insert under Probable Cause

"Placement of right-hand wheel of rewind roller." and under Remedial or Corrective Procedure "Push wheel into roller as far as it will go."

Paragraph 7-3. 6. 6.* line 9:

line 10:

Delete "to the left? and substitute "upward".

Delete "to the right" and substitute "downward".

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Addendum 2a (cont.)

Paragraph 7-5. 10. c, line 1: Substitute ’’loosen" for "remove".

line 5 : Substitute "loosening" for "removing".

Paragraph 7-5. 10. d: Add "The connections to the chart-drive motors are automatically broken when the chart-drive mechanism is pulled forward."

Paragraph 7-5.11.: Delete entire paragraph.

Paragraph 7-5.12.: Delete entire paragraph.

Paragraph 7-5.13.: Delete entire paragraph.

Figures 8-3 and 8-6: Add CHART DRIVE terminals to the recorder (M203)

and connect these terminals to those of the recorder lamp (E204).
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Addendum 2b

To Instruction Book for Transmissometer Set AN/GMQ-10

Recorders With Synchronous-Motor Drive and Spring-Driven Rewind

(Esterline-Angus Series 79F) and With Series 321 Meter Movement,

The chart drive of these recorders requires no winding. The rewind

mechanism is spring driven. One winding of the rewind spring is sufficient to reroll a complete roll of chart. For detailed instructions

see Esterline-Angus Instructions Nos. 644-C and 942-M supplied with the

transmissometer.

Make the following changes in the manual. Note: When a paragraph

is marked "See Addendum 2b", reference is made to a paragraph in this

addendum bearing the same paragraph number as the original paragraph.

Sheets 2 and 3 may be discarded after the appropriate changes have been

made.

Paragraph 6-6.3. l.b: Unwind the reroll mechanism by turning the winding

crank in the counterclockwise direction until the spring is completely

unwound as indicated by the reroll disk being driven in the reverse

direction. Remove the cover of the reroll gear train and place a drop

of oil on each bearing and gear. Replace the cover and rewind the spring.

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Addendum 2b (cont.)

Paragraph 1-4,2. 3. d, line 10: Delete "clock driven" and insert "motor

driven with spring-driven rewind".

Paragraph 3-8. 4. 3, , line 3: Delete remainder of paragraph following

"by means of" and insert "a synchronous motor driving the chart and

a spring-driven rewind mechanism."

Paragraph 3-8, 4, 3. a: Delete all material following the first sentence

and substitute "Wind until the clutch on the rewind spring starts to

slip."

Paragraph 3-8, 4, 3. d: Change to read "On chart drives having per-minutfe

in addition to per-hour feeds, turn the CHART DRIVE control lever to

SLOW FEED."

Figure 3-16: Mark "Not applicable in all details^?

Figure 3-18: Mark "Not applicable in all details^?

Paragraph 4-2, 3, 4. , line 2: Delete remainder of paragraph following

"clock" and insert "from per-minute to per-hour feeds.'?

Figure 4-3: Mark "Not applicable;,?

Paragraph 4-4. 4.a: Delete and substitute "Disconnect recorder from

power."

Paragraph 5-8,4., line 2: Delete "spring-powered clock" and insert

"synchronous". Delete entire second sentence, add ?’0ne winding of the

rewind spring is sufficient to rewind one roll of record chart." at

end of the paragraph*

Paragraphs 6-6,3. l»b: Mark "Not applicable, see Addendum 2b.?

Paragraph 6-6.3. l.d: Delete "escapement" and substitute "chart-drive

gear train". Add " Do not oil the synchronous motoy."

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.Addendum 2b (cent.)

Paragraph 6-6. 3. 2.: Delete entire paragraph.

Paragraph 6-7. 3. 2. f: Delete '‘mainspring*’ and insert "rewind”.

Paragraph 7-3. 6.1.: Delete second Probable Cause and corresponding

Remedial or Corrective Procedure.

Paragraph 7-3. 6. 2.: Under Probable Cause, change to "Power line

frequency not properly regulated.;’ Under Remedial or Corrective Procedures, delete entire paragraph.

Paragraph 7-3. 6.3. : Delete first and third sentences opposite "Aero!

spring unwound.!’

Paragraph 7—5.11. : Delete entire paragraph.

Paragraph 7-5.12.: Delete entire paragraph.

Paragraph 7-5.13.: Delete entire paragraph.

Figures 3-3 and 8-6: Add CHARY DRIVE terminals to the recorder (51233

and connect these terminals to those of the recorder lamp (3234).
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Addendum 3

To Instruction Book for Transmissometer Set AN/GMQ-10

Transmissometers With Special Projectors

Transmissometer Set AN/GMQ-10 is designed for use where the

separation between the projector and the receiver does not exceed 750

feet. When longer separations are necessary, special projectors and

modified projector power supplies are necessary. When these special

items are supplied, make the following changes in the manual for

Transmissometer Set AN/GMQ-10. When a paragraph is marked "See Addendum 3", reference is made to a paragraph in this addendum bearing

the same paragraph number as the original paragraph. Sheets 4 to 10

may be discarded after the changes have been made.

Paragraph 1-3,1,: SPECIAL PROJECTORS. Special projectors consist of

a precision-grade parabolic reflector and a low-voltage lamp in a suitable housing. The beam is directed horizontally and has a peak

candlepower of 1,000,000 candles for 12-inch diameter reflectors,

2,000,000 candles for 18-inch reflectors, and 5,000,000 candles for

24-inch reflectors. The reflector and lamp are housed in a castaluminum case with a plate glass cover. The cover is protected by a sheet metal hood. The housing may be rotated about a vertical and a horizontal axis so that the beam of the projector may be directed at

the receiver.

Paragraph 3-1. 2. 7.: The length of the baseline should not exceed

1500 feet for a 12-inch projector, 2500 feet for an 18-inch projector

and 4000 feet for a 24-inch projector.

Paragraph 3-2. 5. 2.: Baffles must be designed to meet the requirements

of a particular installation. The central hole in the baffle should

be no larger than necessary to clear the projector. The over-all

dimensions of the baffle should be not less than 0.004 times the length

of the baseline. The opening for the projector should be in the center

of the baffle. This requires that the baffle extend below the top of

the stand. The baffles should be painted a flat black.

Paragraph 3-8. l.e: Make a preliminary adjustment of the focus of the

projector. This can be accomplished most easily at night. Adjust

the fore and aft position of the lamp by means of the nuts on the

mount supporting the lamp socket so that, when viewed from directly

behind and above the projector, the bright outer edges of the beam appear

to intersect at infinity. An alternate method is to direct the light

Addend am 3 (c on t .

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beam at a wall or screen at least 100 feet away and adjust the focus

for the sharpest image of the lamp filament.

Paragraph 3-3. l.g: If. with the lowest voltage setting of the LAMP

VOLTS switch, step 1, the lamp intensity is well above the intensity

required to produce an off-scale reading of the TRANSMISSION meter,

connect a 7.5-ohm, 50-watt resistor in series with the primary of

T303 (between terminal 12 of E303 and the LAMP VOLTS switch). This

vdll increase lamp life by a factor of three or four.

Paragraph 5-3.1.: PROJECTOR LAMP AND REFLECTOR. The projector lamp

is a 12. 5-volt, 250-watt lamp with a C-8 filament in a T-13 bulb with

a medium prefocus base. The lamp has a rated life of 50 hours when

operated at 12.5 volts, but is usually operated sufficiently below

rated voltage so that a life of 200 hours is obtained. The reflector

is a ground and polished precision-grade parabolic reflector. Generally a 24-inch diameter reflector with s 10-inch focal length is

used. This lamp-reflector combination produces an essentially parallel

beam with, an intensity in the peak of approximately 5,000,000 candles.

The beam spread at 95% of peak intensity is 0,3° horizontal by 0.9°

vertical and at 10% of peak intensity it is 1° horizontal by 2°

vertical. A blackened shield in front of the lamp prevents direct

(uncoil in® ted) light from leaving the lamp. A low-voltage, highcurrent filament is used be obtain the maximum peak intensity con- sistent with the desired lamp life.

Paragraph 6-2. 2. 4. : Focusing Adjustment Nuts. Six hex-head nuts on threaded rods supporting the lamp socket permit adjusting position of

the lamp filament so that it is on the axis of the reflector and at

the proper distance from the reflector.
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Addendum 3 (cont.)

Figure 1-1: Mark ’’Not applicable in all details."

Paragraph 1-2.3.: Delete ”ML-461/GMQ-l(f and "?P-908/GMQ-10j’.

Paragraph 1-3.1.: Delete and mark M See Addendum 3."

Paragraph 1-3.2., lines 1 and 2: Delete "PP-908/GMQ-10".

line 8: Delete "ML-461/GMQ-10".

Paragraph 1-3.2. 1., last line: Delete "PP-908/GMQ-10".

Faragraph 1-3.6.: Add "These cable terminal chambers are not supplied

as part of the instrument and are to be obtained locally."

Figure 1-4: Mark "Not applicable.?

Figure 1-12: Mark "Not applicable.”

Paragraphs 1-4. 2. b, c, d, and e: Delete entries and insert applicable

data.

Paragraph 1-4. 2. f (2): Delete "3.75" and insert "5.5".

Paragraph 1-4.2. 1., Title: Delete type numbers.

Paragraph 1-4.2. 1. a: Delete"140,00CP and insert "5,000,000*".

Paragraph 1-4.2. l.b: Delete "0.5° by 1°" and insert "0.3° by 0.9°";

delete "5° by 10 °" and insert "1° by 2°*”.

Paragraph 1-4.2. l.c: Delete entire paragraph and substitute "Lamp:

12.5-volt, 250-watt, T-10 bulb, C-8 filament, medium prefocus base."
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Addendum 3 (cont.)

Paragraph 1-4.2. l.d: Delete "3000” and insert "200".

Paragraph l-4.2.1.e: Change "1.6 amperes" to "4 amperes".

Page 1-9 at bottom: Add the following footnote: " ’"Applicable to 24-

inch reflectors only.!*

Table 1-1, Item 1: Delete all material following "PROJECTOR" and insert

applicable data.

Table 1-1, Item 2: Delete "PP-908/GMQ-10". Delete "111.2".

Table 1-3, Item 1: Delete all material following "PROJECTOR" and

insert applicable data.

Table 1-3, Item 2: Delete "PP-998/GMQ-10" and "147",

Table 1-5, Column 3 heading: Change "2 amp" to "5 amp".

Paragraph 3-1. 2. 7.: At end of paragraph add "See Addendum 3.!*

Paragraph 3-2.3. 1.: Add "See manufacturer's data for outline and basing

dimensions of the projector’.!*

Paragraph 3-2. 5. 2.: Delete all material following the second sentence

(beginning with "A baffle —") and add "See Addendum 3."

Figure 3-3: Add "Note F. See manufacturer's data for outline and

basing dimensions of the projector and mark the three drawings showing

outline and basing dimensions of projector (at bottom of the page)

'Not applicable'.!*

Paragraph 3-3.2. 1., line 5: Delete "0.20" and insert "0.60".

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Addendum 3 (cont.)

Paragraph 3-3. 4. 2., column 2, line 6: Delete "because" and insert "if".

Figure 3-5: Add "Note F: When W301 is a 2-conductor cable, run ground

wire to projector,”

In Note A change "0.5 kva" to "0.75 kva".

Change description of W301 to "2-conductor *12". Run

ground wire to projector from power supply.

Figure 3-6: In Note A change "0.5 kva" to "0.75 kva". In center of

figure change "0.35 kva" to "0.60 kva". Delete type numbers of projector

and power Supply,

Figure 3-9: Mark "Not applicable.'*

Paragraph 3-8. l.b, line 2: Delete reference to figure 3-9.

line 6: Delete "eight" and insert "one",

line 7: Delete "22.5" and insert "20". Delete

remainder of paragraph beginning with "or 48 hours at 20 amperes".

Paragraph 3-8. l.d,

Paragraph 3-8. l.e:

graph.

Paragraph 3-8. l.f,

alignment screws".

Paragraph 3-8. l.g,

"aperture". Add "

Paragraph 3-8. 2. g,

’Alignment".

line 2: Delete "6.0" and insert "Position 3".

Insert "See Addendum 3" at beginning of the paraline 5: Insert "and the focus" after "vertical

line 5: Delete remainder of sentence following

See Addendum 3."

line 3: Insert "focusing" between "final" and

Paragraph 4-2.4.: Opposite LAMP VOLTS delete "5.4 unless otherwise"

and insert "minimum". Add "See Addendum 3 , paragraph 3-8. l.g,"

A3 -5
-

- ... I

' 5

, 4
'j*

Addendum 3 (cent.)

Figure 5-1: Delete "R-547/GMQ-10” and "AM-809/GMQ-10".

Paragraph 5-2.2., line 2:

line 4:

intensity”.

Delete "sealed-reflector”.

Insert ”a reflector” after "constant

Figure 5-2: Modify as follows: Change number of background relay

from "K301” to "K301A". Add block marked "Auxiliary Relay, K301”

between rectifier and background relay blocks. On line to projector

change ”4.8 - 7.2” to "10.4 - 12.4".

Figure 5-3a: Add the letter "A" to "K301”. Under F30l change "2A

to "5AM

.

Figure 5-3b: Modify circuit as follows in lower right hand corner

*: i

II

m - -6
4,

' '

V;:
Addendum 3 (cent.

)

Paragraph 5-3.1.: Mark ’’Not applicable, see Addendum 3 ."

Paragraph 5-3.4. : Delete entire paragraph.

Table 5-1: Change table to read as folloxvs:

Table 5-1 (Not applicable to Frequency-Compensated "C-V" Transformers)

Position of Output Voltage Relative Intensity

LAMP VOLTS of Step-down of

Switch Transformer* Projector Lamp

1 10.4 53

2 10.9 64

o 11.4 75

4 11.9 87

5 12.4 100

*Measured at terminals of lamp E301 using 15 feet

of 2-conductor *12 for W301.

Data for frequency-compensated c-v transformers is not presently

available.

Paragraph 5-4.3., line 5: Change ”6 volts" to "12 volts".

Paragraph 5-4.4.: Delete all material following first sentence. Insert

"Tsble 5-1 gives the voltages corresponding to the positions of S303."

Paragraph 5-4.4. 1., page 5-6, line 7: Delete remainder of sentence

following "completely opened". Add "See paragraph 3-0. l.g in

Addendum 3,"

Paragraph 5-4.5. 1.: Add at end of paragraph "Opening of relay K30i

in turn allows power relay K331A to open."

Paragraph 5-4. 5.3., line 2: Change "1(331" to "IC301A"
(I
Addendum 3 (CO ;lt.)

Paragraph 5-4.3., line 11: Change third sente ace to read "Seasoning

for one hour at 20 amperes will stabilize the lamp."

Fi giiP© 5- 19: mke the same changes as made in figure 5-2.

Paragraph 6-1.3.2., line 4: Change "2-ampere" to "5-arapere".

Paragraph 6-2. 2. 4. : Add "See Addendum 3.”

Paragraph 6-3.3. 1.: Add "AND FOCUSING" to title. Add "of manual and

of Addendum 3" at end of reference.

Paragraph 6-3. 3. 2.: Add "of manual and of Addendum 3" at end of

reference.

Paragraph 6-7.3. 4. e, line 2:

and "of".

Insert focus" between "alignment"

Paragraph 7-1.4. : Under first Defective

Delete Defective Components headed "T3G1

Procedures.

Covnonent add "or K301A".

and "ESDI" and corresponding

Paragra ph 7-2. 2 .

,

Ch nge "6 vac" to

step 6: Change "5 to 7 volts" to "13 to 13 volts".

step 8: Add "K331A" to Probable Failures.

step 9: Delete "LAP.!? VOLTS switch to 6.0 position".

step 10: Delete "LAMP VOLTS switch to 6. 0-volt position".

"12 vac". Change "7 volts" to "13 volts".

step IT: Add "K331A". to Probable Failures.

Paragraph 7-3.2. 1.: Change "K301" to ”IC31.

Paragraph 7-3. 2. 4. : Add "or focus" to first Probable Cause and "or

refocus" to corresponding Remedial or Corrective Procedure.

A3 -8
" : . r

tt
Addendum 3 (cont.)

Paragraph 7-3,3. 1.: Add "or focus” to first Probable Cause and "and

focus” to corresponding Remedial or Corrective Procedure,

Delete second and third sentences of second

Remedial or Corrective Procedure and corresponding footnote.

Figure 7-7: Mark "Not applicable in all details."

Figure 8-1: Add relay K301A to diagram. See the changes indicated

for Figure 5-3b above for details.

Mark winding resistances listed for T303 in notes "not

applicable.”

Change output voltage of T303 from "4.8-7.2v" to

"10.4-12. 4v".

Delete voltage designations of terminals of S303 and

label them 1, 2 t 3 f 4, and 5 (from left to right).

In T301 block delete "infinite ohms" and insert "1.5

ohms". „ Delete "1.2 ohms" and insert "0.9 ohms"* Add "These values are

not applicable to* frequency-compensated "c-v" transformers,"

Change TEST VOLTAGES table as follows:

Position of

S3 03

Voltages Between Voltage Between

Terminals 7 & 8** Terminals 11 & 12**

1 10.4 115

2 10.9 115

3 11.4 115

4 11.9 115

5 12.4 113

**Not applicable to frequency-compensated

"c-v" transformer.

Figure 8-4:

Figure 8-9:

Mark "Not applicable in all details."

Mark "Not applicable."

A3-9

Addendum 4 (cont„)

(in feet) divided by 500* If the table does not extend to sufficiently

low values of visibility, use the following relation to obtain additional

values

(T/100) V/R = 0,055

where T is the transmission in percent, V is the visibility and R is

the length of the baseline, V and R must be in the same units.

A.,«=2
•I
Addendum 4 (cont.)

Figure 1-2 s Delete ”500 feet”.

Paragraph 1-2.2.: Change first sentence to read "The set is designed

to provide measurements of visibilities in the range of one-half to

twenty times the baseline by day and from the length of the baseline

to twenty times this distance by night.?

Paragraph 3-1.2. 6., line 4: Delete "ten" and insert "15". Add "when

the length of the baseline exceeds 750 feet" to the sentence.

Figure 3-5: Delete "500 ft" at top of figure and insert the appropriate

distance.

Tables 4-1, 4-2, 4-3, 4-4, 4-5, 4-6: Mark "Not applicable, see Addendum 4.?,

Paragraph 4-5.2,, Example 1, Example 2: Delete.

Paragraph 4-5.3. 1., Example 3. Delete, 3 >>%,

Paragraph 4«5.3,2,» Example 4. Delete.

Paragraph 4-5.4.: Delete entire paragraph.

Paragraph 4-6.4. 2.: Following "99?T add "(For a 500-ft. baseline)".

Paragraph 5-8.6.: Delete entire paragraph.

Table 6-1: Mark "Not applicable, see Addendum 4."

A 4 .3:
* «
Addendum 5

To Instruction Book for Transmis some ter Set AN/GMQ-10

Five-Mi lliampere Indicators

For indicators having a maximum output current of five milliamperes instead of one milliampere, make the following changes. in the manual,,

Paragraph 1-4. 2.3. b: Change "1 ma". to ”5 ma".

Table 1-4: Opposite 6J5 change number of this tube in indicator to "1".

Add "Tube type 5692" and under number in indicator .add "1".

Figure 5-12: On lines between bridge and meter M201 block and between

meter M2Q1 block and recorder block, change "0-1 ma" to "0-5 ma".

Change type of tube V202 to type 5692.

Figure 5-16: In captions for M201 and M203, change "0-1 ma" to "0-5 ma".

Change the values of the following resistors to read as follows: R213,

40K; R212, 390; R210, 47; R209, 100. Change V202 to a type 5692 with the

two sections in parallel.

Paragraph 5-8.2., line 12: Change "15,000" to "500".

Figure 5-19: Make same changes as in figure 12.

Figure 6-1: Change type of tube V202 to type 5692.

Paragraph 7-1.4.: Under "Defective Component, Indicator", add "V202

(5692)" and opposite it enter "Use type 6SN7 tube."

Figure 8-3: Make same changes as in figure 5-16.

AS-1

Addendum 6

To Instruction Book for Transmis some ter Set AN/GMQ-IO

Modification of Indicator to Permit Direct Operation of Pulse Amplifier

It is possible to modify the indicator so that the pulse amplifier may

be operated directly from it. This Addendum describes the necessary changes

in circuitry.

If the indicator is modified, insert page 5-23a (A6-2) and make the

following changes in the manual. When these changes have been made,

sheets A6-3, A6-4 and A6-5 may be thrown away.

A6-1

AN/GMQ-1Q Section V

Paragraphs 5-10,, to 5-10.2,

J

.i' 9

5-10. INDICATOR MODIFIED TO

PERMIT DIRECT OPERATION OF PULSE

MPLIFIER.

5-10.1. GENERAL. IVhen the receiver and the indicator are at the same

site, it may be desirable to operate

the pulse amplifier of the transmissometer directly from the indicator

unit, thereby eliminating the Amplifier-Power Supply AM-809/GMQ-10 from

the system. When the pulse amplifier

is to be operated directly from the

indicator, it is necessary either to

have the indicator meter visible from

the receiver or to use an auxiliary

meter connected in series with this

meter in order to align the receiver

properly. The meter at the projector site should be connected in

series with the indicator meter and

recorder to facilitate the aligning

of the projector.

5-10.2. CIRCUIT CHANGES. The

changes in the circuitry of the indicator consist of changing the

regulated voltage from 300 volts

to 255 volts and adding a plate

load resistor, a coupling capacitor,

and a chassis connector for the pulse

amplifier. Resistor R233 (figure

5-20) is the plate load for V2Q2

when the pulse amplifier is connected to J205. Capacitor C215 couples

to the input of the indicator the

signal generated by the voltage drop

developed across R233 when V202

discharges.

NOTE

Line loading resistor R232

must be disconnected before

the pulse amplifier can be

operated directly from the

indicator. It is desirable

to open one of the connections to C213 to eliminate

the possibility of noise

from the signal line to the

projector being fed into

the indicator.

TO

5-28a

(A 6-2)

Addendum 6 (cont.)

To modify the indicator, make the following changes in the

circuits

Add J205, R233, C215, and S208, connected as shown on page 5-28a.

Change: R213 from 200K to 150K

R214 from 10K, 10-watt, to 7K, 20 watt

R216 from 50K to 40K

R231 from 3500 ohms, 10-watt, to 5000 ohms, 20 watt

V209 from 0D3/VR150 to 0C3/VR1O5

Make the following changes in the manual:

Figure 5-12: Add block as follows:

CALI 3RATE

SWITCH

S203

In VOLTAGE REGULATOR stage of POWER SUPPLY circuit,

change "V209” from "0D3” to ”0C3”.

Change output of POWER SUPPLY circuit from "+300 V DC** to ”+255 V DC”.

Add ”+150 V DC REGULATED" output from POWER SUPPLY

circuit.

Figure 5-13: Add information as shown below:

SIGNAL FROM

PULSE AMPLIFIER —

THROUGH C2I5

J204 v 4

SEE NOTE IN

PARAGRAPH 5-10.2.

TO CONTROL GRID

OF V204 THROUGH

S203 (CALIBRATE)

A6-3

Addenda 6 (cont.)

Figure 5-14:

Figure 5-15:

Add "or C215" to label "INPUT PULSE SIGNAL FROM C213".

Change value of R216 to 40K.

Change value of regulated B+ to 255v.

Figure 5-16: Change value of R2I3 to 150K.

Change value of R214 to 7K.

Change value of regulated B+ to 255v.

Figure 5-18: Change value of R231 to 5,000,

Change V209 to 0C3/VR105.

Change value of regulated B+ to 255v.

Add takeoff "B+ 150 V DC REG." between pin 2, V209,

and pin 5, ¥210.

Figure 5-19: Make the same changes as in figure 5-12,

Figure 8-3: Make the changes indicated for figures 5-15, 5-16, and

5-18.

In addition, in Foltage Measurements Table change

voltage of V209, pin 5, to 255v and in Resistance Measurements Table

change resistance of ¥202, pin 3, to 150K; of ¥203, pin 5, to 7K; of

¥209, pin 5, to 5Kj of J201, pin 1, to 7K, and pin 2 to 150K.

Figure 8-6: Add J205, R233, C215, S208, and connections.

Table of Contents, page ii: Add

#

”5-10. Indicator Modified to Permit

Direct Operation of Pulse Amplifier

5-28a"
$(
Addenda 6 (cont.)

List of Figures, page iv: Add

"5-20 Pulse Amplifier Connections 5-2

Index, page vii, column 2: Add under Indicator

"operation with pulse amplifier 5-1

page viii, column 2: Add under Pulse amplifier

"operation from indicator 5- T

.