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NBSIR 81-1641

ADDENDUM TO

EARTH TERMINAL MEASURMENT SYSTEM

MAINTENANCE MANUAL

John P. Wakefield

Electromagnetic Fields Division

National Engineering Laboratory

National Bureau of Standards

Boulder, Colorado 80303

Equipment developed for

Commanding General

U.S. Army Communications Command

Fort Huachuca, Arizona 85613

QC100

U56

81 - 16^1

1931

October 1981

NBSIR 81-1641

ADDENDUM TO

EARTH TERMINAL MEASURMENT SYSTEM

MAINTENANCE MANUAL

John P. Wakefield

Electromagnetic Fields Division

National Engineering Laboratory

National Bureau of Standards

Boulder, Colorado 80303

MATIOIIAX. 9VJOIAV or 8TAMDAXI>a

UBBAJtT

JAN 2 5 1982

no. ^ Oc/co

4 io no.

c , ^

Equipment developed for

Commanding General

U.S. Army Communications Command

Fort Huachuca, Arizona 85613

October 1981

U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director

PREFACE

This Addendum to the Earth Terminal Measurement System Maintenance Manual,

NBSIR 78-895, September 1978, documents the retrofit which adds a multiplefrequency input capability to the system. The Addendum also includes an errata page for the Maintenance Instruction Manual. This information is valid

as of October 1979.

The organization of this addendum is similar to that of the Maintenance

Manual in that the general system information is presented in the first

sections, the instruction manuals for the retrofit are in the second sections,

and the corrections to the ETMS Maintenance Manual and revised ETMS control

codes are in the final sections.

This ongoing project is under the direction and guidance of

Dr. D. F. Wait. The hardware modifications were accomplished in the

laboratory by Mr. T. H. Bremer and Mr. G. J. Counas.

NOTICE

Certain commercial equipment, instruments, and materials are identified in

this paper in order to adequately specify the required system modifications,

testing procedures, etc. In no case does such identification imply

recommendation or endorsement by the National Bureau of Standards, nor does it

imply that the material or equipment identified is necessarily the best

available for the purpose.

i i i

CONTENTS

PAGE

PREFACE 'ii

ABSTRACT 1 1. GENERAL INFORMATION 2

1.1 Introduction 2 1.2 Hardware 2

1.3 Specifications 3

2. INSTALLATION AND OPERATION . . . . ; 3

2.1 Introduction 3

2.2 Unpacking and Inspection 4

2.3 Initial Installation 4

2.3.1 Control Circuitry Check-out 4

2.3.2 RF Circuitry Checkout 4

2.4 New-Site Equipment Setup 5 2.4.1 Equipment Setup 5

3. THEORY OF OPERATION 5 3.1 Introduction 5

3.1.1 Measurement Description 6

3.1.2 Operational Description 6

3.1.3 Description of Multi-Input Port Update 7 3.2 Retrofit Control Theory 7 3.2.1 ETMS Console Modification 7

3.2.2 Multi-Input Port Relay Module 8

4. TROUBLESHOOTING 8

4.1 Initial Checks 8

5. ETMS CONSOLE INPUT CONTROL MODIFICATIONS-INSTRUCTION MANUAL. . . 10

5.1 Digital Control Circuits 10

5.1.1 Z-800 Logic Circuit Description 10

5.2 Relay Switch Driver Circuits 13

5.2.1 Introduction 13

5.2.2 Driver Circuit 13

5.3 Retrofit Modifications to ETMS Console 14

5.3.1 Modifications 14

5.4 Troubleshooting 17

5.5 Parts List (Z-800 PC Board) 18

5.6 Wiring List(J-400 Revised) 22

5.7 Wiring List(J-700 Revised) 23

5.8 Wiring List(J-800 Revised) 24

5.9 Wiring List(J-651 Revised) 25

5.10 Wiring List(j-658) 25

6. MULTI-INPUT PORT MODULE- INSTRUCTION MANUAL 31

6.1 Introduction 31

6.2 Module Description 31

6.3 Troubleshooting 31

6.4 Parts List Multi-Input Port Module 34

6.5 Wiring List(Relay Module Control Cable) 35

6.6 Spare Parts Additions 38

7. REFERENCES 38

8. ETMS CONTROL CODES 39

9. REVISIONS AND ERRATA FOR ETMS MAINTENANCE MANUAL 40

9.1

Revisions and Retrofit . 40

v
LIST OF FIGURES

PAGE

Figure 1. Z800 PC Multi-Input Port Control Card 11

Figure 2. P.C. Z800 Schematic Diagram 27

Figure 3. Z800 PC Card Parts Layout 29

Figure 4. Multi-Input Relay Module 32

Figure 5. Multi-Input Relay Module Schematic Diagram 36

Figure 6. Multi-Input Relay Module Parts Layout 37

vi
ADDENDUM

EARTH TERMINAL MEASUREMENT SYSTEM

MAINTENANCE MANUAL

John P. Wakefield

Electromagnetic Fields Division

National Bureau of Standards

Boulder, Colorado 80303

This addendum to the Earth Terminal Measurement System Maintenance Manual, NBSIR 78-895, describes the equipment and maintenance

procedures required to support the retrofit package for the Earth

Terminal Measurement System (ETMS) developed by the National Bureau

of Standards. This retrofit adds a multi -input-port relay module

which provides the capability of connecting three receiver channels

to the ETMS, thereby enabling measurement of pertinent earth terminal

parameters at as many as three frequencies in a single measurement

pass. This manual does not include measurement theory nor measurement

operating procedures that are described in the Earth Terminal Measurement System Operation Manual, NBSIR 78-879.

Key Words: earth terminal; earth terminal measurement system; figure of

merit; noise temperature; satellite communication.

1
1. GENERAL INFORMATION

1.1 Introduction

The earth terminal measurement system (ETMS) is a portable automated

measurement system developed around the NBS Type IV self-balancing power

meter. The system measures pertinent power ratios used in determining various

performance parameters of satellite receiving earth terminals.

The ETMS connects to the IF patch panel of the earth terminal being

evaluated. The retrofit module adds coaxial relays and the associated control

circuitry necessary to sequentially connect the IF outputs of up to three

earth terminal down-converters to the input of the ETMS. This modification to

the system is compatible with the original software, so that the system can be

used for a single input as originally designed. Either the original software

or the updated multi-input software [1] can be used with or without connecting

the relay module.

This report is an ADDENDUM to the Earth Terminal Measurement System

Maintenance Manual [2].

1.2 Hardware

The hardware retrofit consists of a coaxial relay module, a 2-meter (6-ft)

interconnecting control cable (see figure 4) and a relay control printedcircuit card which is installed in the ETMS control unit (figs. 2 and 3).

The coaxial relay module is interfaced to the earth terminal IF patch

panel by patching up to three coaxial cables between the down-converter

outputs to the relay module and a coaxial cable connecting the module to the

input of the ETMS control unit. An interconnecting control cable connects the

relay module to the ETMS control unit. This arrangement permits the relay

module to be used as an accessory unit to the ETMS when needed. Light

emitting diodes (LEDs) mounted in the relay module indicate which input is

currently selected.

2
The relay control printed-circuit card (designated Z-800) decodes the

control codes (on the control data buss) which to actuates the relay module

and energizes the respective coaxial relay. Signals are supplied to light the

LEDs on the relay module indicating the currently selected input.

The Z-800 relay control card also provides the necessary flag signal

circuitry for computer control, and will generate a return flag regardless of

whether or not the relay module is connected.

1.3 Specifications

The multi-input retrofit to the ETMS includes internal control circuitry

and an accessory relay module which provides three Type-N coaxial connectors

to remotely controlled relays so that the input to the ETMS can be selected at

the ETMS control unit or at the computer. LED's on the relay module indicate

which input is currently selected. The relay module has a built-in eyeloop to

attach a cord for strain relief when suspending the module from the IF patch

panel

.

The ETMS can be operated either with or without the accessory relay module

connected.

2. INSTALLATION AND OPERATION

2.1 Introduction

The multi -input coaxial relay module and attached control cable can be

packed in the transit cases with the ETMS equipment or in the spare parts

supply case for transit.

The control circuitry for this module is permanently installed within the

ETMS control unit.

3
2.2 Unpacking and Inspection

Unpack the ETMS console and accessory relay module and inspect for

shipping damages.

2.3 Initial Installation

Remove the ETMS control unit and the multi-input coaxial relay module from

the transit cases. Connect the relay module control cable to J-658 on the rear of the ETMS control unit. Connect a coaxial cable from the relay module

output connector to the input to the ETMS control unit and connect the ETMS

simulated star output cable to number one input connector of the relay

module. Connect the ETMS control unit to the ac power line and turn the power

switch on.

2.3.1 Control Circuitry Check-out

Set control code 127 into the ETMS programming switches using the

procedures described in section 2. 3. 1.1 of the Earth Terminal Measurement

System Maintenance Manual and press the LOAD button. The LED located at input

connector #1 should light and a mechanical click from the relay switch will

probably be heard. Set control code #126 into the programming switches and

press the LOAD button to select input #2. The LED at input #2 should light

and the relay switche click should be heard. Repeat the procedure for

programming control code #125 into the system and input #3 should be selected.

To verify that the computer control and flag circuitry are functional, the

ETMS must be connected as described in section 2.3 of the Maintenance

Manual. Program the computer as described in section 2. 3. 1.2 and execute

control codes #127, #126, and #125 to select inputs #1, #2, or #3,

respectively. This completes the checkout of the control circuitry.

2.3.2 RF Circuitry Checkout

Program the selected input for the simulated star output, using the

procedure described in 2.2.1 above. Adjust the controls on the ETMS control

4
unit to obtain an indication on the ETMS output level meter as described in

section 2.3. 1.3 of the Maintenance Manual.

Using the programming procedures described in the section above, select

and deselect the connected input, noting that the ETMS output level meter

indicates whether or not an input signal has been selected. Move the input

signal to the other input connectors, repeating the test to verify that each

input is functioning properly.

2.4 New-Site Equipment Setup

2.4.1 Equipment Setup

Unpack and assemble the equipment as described section 2.4 of the ETMS

Maintenance Manual. Locate the Input Relay Module and suspend it on a cord at

the earth terminal IF patch panel so that the IF patch cables can be

conveniently connected between the down-converter outputs and the relay module

input connectors. Connect the relay module control cable to J-658 on the rear

panel of the ETMS control unit.

After performing the ETMS system checkout described in section 2.4.5 of

the Maintenance Manual, connect the coaxial cable mentioned in section 2.4.4

between the relay module output connector and the ETMS RF input. Set the

down-converter frequencies and note that signal noise is present from each

connected input as indicated by the ETMS output level meter. Then complete

the test sequence described in section 2.4.4 of the Maintenance Manual.

3. THEORY OF OPERATION

3.1 Introduction

This section describes the theory of operation of the multi -input

modification, and will refer to the Maintenance Manual for an overall

description of the ETMS. Section 5 of this manual should be applied as an addendum to section 5 of the Maintence Manual entitled ETMS CONTROL/RF:

5
INSTRUCTION MANUAL. Section 6 of this manual describes the multi-input

coaxial switching relay module which is an accessory to the ETMS,

3.1.1 Measurement Description

The measurement of the pertinent power ratios along with the real-time

star location predictions is acomplished using the ETMS. The ETMS is an automated measurement system developed around the NBS Type IV self-balancing

power meter [3].

3.1.2 Operational Description

The ETMS system incorporates a noise radiometer, capable of high-precision

rf power measurements, which has been combined with a programmable calculator

and clock. The calculator has been programmed to automatically operate the

radiometer. The system is used to measure the ratio of antenna gain to system

noise temperature, (G/T), of an earth terminal antenna system.

The measurement sequence first reads time from the clock and calculates

the predicted azimuth and elevation required to point the antenna toward a selected radio-star. Then, as the earth rotates, the system records repeated

measurements of received noise power while the radio star drifts through the

beam of the antenna. This drift routine is repeated five times using a different declination angle offset from the star each time. One additional

pass is made to establish a "sky background" noise level. This is

accomplished by offsetting the antenna from the radio star to a quiet area in

the sky.

The program then reprocesses these data using curve-fitting routines to

calculate the maximum intensity of noise power (star flux) at the center of

the antenna beam. The G/T ratio of the earth terminal is evaluated using

measured data of the background noise temperature, the reciever system noise,

and the star-flux noise temperature as seen by the antenna. Corrections are applied for atmospheric effects and antenna parameters.

The multi -input frequency retrofit is necessitated by the time required

for the six star passes needed to establish a set of data based on the

6
rotational speed of the earth; thus making it possible to collect data at more

than one frequency during a single data set. This multi-input port accessory

is a three-input coaxial relay which is controlled by the computer so that

measurement points may be selected sequentially from each input. When the

inputs are connected to three different down-converters operating at

different frequencies, data for all three frequencies are obtained; however,

only one-third as many measurement points at any one frequency are recorded.

Refer to the ETMS Operators Manual [1] for a rigorous analysis of the

measurement theory and procedures.

3.1.3 Description of Multi-Input Port Update

The remote multi-input relay module contains two coaxial single-pole

double-throw relays connected to provide three input ports to the ETMS

radiometer. LEDs are mounted on the cover plate adjacent to each input port

to indicate the currently selected port. A supporting eye-loop is built into

the cover plate so that the module can be suspended from the IF patch panel to

relieve the strain on the connecting coaxial cables. A coaxial cable

interconnects the output of the relay module to the input of the ETMS. The

coaxial relays are operated by an interconnecting 2-meter (6-ft) control cable

which plugs into the rear panel of the ETMS control unit. The selective

control logic and coax switch driver circuits are contained on a printed

circuit board which was added to the PC card cage in the ETMS control unit.

This logic decodes the control codes and generates the drive pulses to the

proper coaxial relay and the handshake flag signal to the computer.

Additional spare parts included in the update are: (1) a replacement

coaxial relay, (2) a spare Z-800 relay control printed circuit card, and (3)

this Addendum to the ETMS Maintenance Manual which describes the

modifications.

3.2 Retrofit Control Theory

3.2.1 ETMS Console Modification

The multi-input port modification to the control unit consisted of

installing the Z-800 relay control PC card onto the PC card cage, modifying

7
the back-plane wiring as necessary, and the addition of a J-658 jack on the rear panel of the ETMS.

The control -unit data-buss lines and the CTL signal (strobe) were rerouted

through the Z-800 card in order to insert buss driver buffers in the lines.

The wire connecting the flag signal from the Noise-add card (Z-700) to the Z400 PC card was removed and the Z-800 card flag circuitry connected in series

with them to accommodate the multi-input port flag signal. The coax switch

drivers were connected to the new J-658 jack on the rear panel.

The selective logic on the Z-800 PC card decodes the input port select

control code from the data buss, and in turn enables the CTL signal. The

enabled CTL signal serves three functions: (a) strobes the low 4 bits of data

into the data latches, (b) initiates a one-shot which times the coaxial relay

driver pulses, and (c) acts as a flag signal which is sent back to the Z-400

PC card.

3.2.2 Multi-Input Port Relay Module

The three-input relay switching module is used as an accessory to the ETMS

in that the system will operate as a single-input instrument without the relay

module. The module contains magnetically latched coaxial relays which provide

three selectable inputs and are remotely controlled by the ETMS. The relay

switching pulses and the signals to drive the LED indicators are generated by

the Z-800 card and are connected to the relay module via the attached control

cable and P-658.

4. TROUBLESHOOTING

4.1 Initial Checks

Initial trouble shooting, or even signal checkout, should include verifing

(1) that the desired input connectors are connected to the proper downconverters, (2) that the down-converters are properly phase-locked, and (3)

that both the RF input cable and the multi-input module control cable are

8
connected to the ETMS control unit. Follow the same procedure given in the

Maintenance Manual (paragraphs 2. 4. 3. 2 and 4.1.1) that describes turning the

noise-add standard on and off and watching for the correspondi ng ETMS signal

level meter change. If the multi-input module is suspect, remove it and

connect the ETMS directly to one down-converter channel and verify that the

rest of the system is functional.

Determine if the malfunction symptom is an input control signal failure or

a loss of signal in an RF circuit. Then follow the appropriate

troubleshooting procedure given in the ETMS Maintenance Manual.

9
5. ETMS CONSOLE INPUT CONTROL MODIFICATIONS-INSTRUCTION MANUAL

5.1 Digital Control Circuits

The multi-input modification involves the addition of another PC card (Z800) and jack J-658 on the rear panel which connects the multi-input module

control cable. The control circuitry for the multi -input module was designed

to incorporate the necessary data, control, and flag circuits with a minimum

of modification to the ETMS. However, the additional loading on the data buss

necessitates inclusion of data buss drivers in these lines.

The data lines were disconnected from the multiplexers on the Z-700 board

and reconnected to the data buffer outputs on the Z-800 card. The

multiplexers were then connected to the inputs of the Z-800 data buffers. The

CTL signal (strobe) circuit was modified the same way to include a bufferdriver in the circuit. The interconnecting wire in the flag circuit between

the Z-700 board and the Z-400 board was removed and the flag circuit was connected in series through the Z-800 board, thereby including the input-port

flag signal.

A one-of-ten decoder connected to the four high-order data bits decodes

the input port control code which enables the CTL signal to load the data

latches with the data currently on the four low-order data buss lines. The

enabled strobe pulse is connected back to the flag circuit to signal the

computer that the data has been received.

Data in the latches is decoded and then enabled to the appropriate relay

driver circuits by a one-shot pulse which is initiated by the strobe signal.

The data in the latches is also decoded by an auxiliary decoder to drive LED

indi cators.

5.1.1 Z-800 Logic Circuit Description

Data from the multiplexers on the Z-700 board enters the Z-800 board and

is buffered by IC-802 and IC-804 before being distributed to all data buss

lines in the ETMS. The one-of-ten decoder, IC-801, detects when the four

10
11

Figure

1.

Z800

PC

Multi-Input

Port

Control

Card
high-order data lines (E, F, G and H) are in a low state, thus initiating a Z800 enable signal. This low-true enable signal is combined with the low-true

CTL pulse in IC-803 NOR gate to generate the Z-800 strobe pulse. The strobe

pulse is ORED with the Z-700 noise-add flag in IC-803 and then inverted before

being connected to the flag combining circuits on the Z-400 board.

Data on the four low-order data lines is stored in the data latches IC-805

by the Z-800 strobe pulse. The data stored in IC-805 is decoded in the

auxiliary decoder, IC-811, and the decoded information is connected through

current-limiting resistors to drive the external LED indicators.

The three (3) low-order data bits (A, B, and C) stored in IC-805 are connected to the relay-driver decoders IC-806 and IC-808. Decoder IC-806

selects the proper relay input port, while IC-808 controls the "tree" relay to

select either the double-throw zero/one input relay or the double-throw

two/three* input relay. In order to automatically switch the tree relay to

either the zero/one relay or the two/three relay without additional

programming, the (a) input of decoder IC-808 is connected to stored data bit

B, with the (b) and (c) inputs grounded.

Decoders IC-806 and IC-808 are held in the disabled state by connecting

the (d) inputs to the 'not Q' output of the one-shot IC-807. These decoders

are decoding "8" or greater until the Z-800 enable strobe triggers the oneshot, at which time the (d) input goes low and the proper outputs, zero through 7, are decoded low-true for the duration of the one-shot pulse. The

decoded pulses are inverted and connected to the proper bi-polar relay drivers

to switch the appropiate relays, thereby connecting the correct RF input port

to the ETMS.

One unprogrammed decoder, IC-809, and a spare bi-polar relay driver are located on the Z-800 board, but are not used.

*Prototype unit only - otherwise input #3.

12
5.2 Relay Switch Driver Circuits

5.2.1 Introduction

One bi-polar relay switch driver circuit for each coaxial double-throw

relay is located on the Z-800 board. Each of these drivers can furnish either

a positive switching current or a negative switching current to the respective

relay. These drivers are pulsed by the decoding logic, and the relays are magnetically latched.

5.2.2 Driver Circuit

The relay switch driver circuit is constructed so that the relay coil is

floating, thus the circuit has the capability of connecting opposite ends of

the coil to either +24 volts or ground. If the drive pulse from the decoder

logic is on the base of transistor Q803, for example, Q803 will turn on,

grounding the (+) lead on the relay. Grounding the (+) lead also completes

the bias circuit through R805 to the base of transistor Q802, turning Q802 on and connecting the (-) lead of the relay to +24 volts thereby pulsing the

relay coil in reverse polarity. Conversely, if the input pulse is on transistor Q804, Q804 will ground the (-) lead of the relay and also turn on transistor Q801 through R806, connecting the (+) lead of the relay to +24

volts.

Switch driver #1 controls the zero/one input port relay, #2 controls the

two/three input relay*, and #3 controls the "tree" relay which switches

between the zero/one and the two/three port relays. Switch driver #4 is a spare and is not used.

*The two/three relay is used only on the prototype.

13
5.3 Retrofit Modifications to ETMS Console

5.3.1 Modifications

The following itemized list of modifications is included here as a record

of the modifications required by the multi -input port retrofit, and is not

intended to be a complete description sufficient to install a retrofit kit.

All the changes to the ETMS for this retrofit are located in the ETMS control

unit.

Modifications: To add multi-input port switching to the ETMS console.

1. Enlarge the square cutout in the center of console chassis to

permit addition of another PC card connector.

2. Mount the new PC card guides to the side of the card cage.

3. Fasten PC edge connector to chassis, aligning with card guides.

4. Relocate step-attenuator plate assembly and mount to chassis.

5. Reconnect step-attenuator control wires.

6. Fabricate two short coaxial leads to reconnect step-attenuator

in RF circuit.

7. Cut hole in rear panel of cabinet and mount connector J-658.

8. Attach J-658 label to rear panel adjacent to cutout.

9. Extend ground-buss wires on PC pins 1 and 2, and pins 59 and 60 to

the new PC edge connector and also connect to chassis ground with leads as short as possible.

10. Move data-buss lines to Z-800.

14
bit A. Remove all wires from J700-41 (Z400-44,J651-1

)

Reconnect wires to new J800-41.

bit B. Remove all wires from J700-37 (Z400-42,J651-2)

Reconnect wires to new J800-42.

bit C. Remove all wires from J700-25 (Z400-40,J651-3)

Reconnect wires to new J800-33.

bit D. Remove all wires from J700-31 (Z400-38,J651-4)

Reconnect wires to new J800-31.

bit E. Remove all wires from J700-36 (Z400-51.J651-5)

Reconnect wires to new J800-55.

bit F. Remove all wires from J700-42 (Z400-49,J651-6)

Reconnect wires to new J800-53.

bit G. Remove all wires from J700-30 (Z400-52,J651-8)

Reconnect wires to new J800-51.

bit H. Remove all wires from J700-24 (None).

Reconnect wires to new J800-49.

11. Connect incoming data lines.

bit A. Connect wire from J700-41 to J800-43.

bit B. Connect wi re from J700-37 to J800-44.

bit C. Connect wire from J700-25 to J800-38.

bit D. Connect wi re from J700-31 to J800-40.

bit E. Connect wi re from J700-36 to J800-56.

bit F. Connect wire from J700-42 to J800-54.

bit G • Connect wi re from J700-30 to J800-52.

bit H. Connect wire from J700-24 to J800-50.

12. Flag signal circuits.

a. Remove wire between J400-50 and J700-50.

b. Connect wire from J 700-50 to J800-46.

c. Connect wire from J800-48 to J400-50.

15
13.

Control strobe (CTL).

a. Remove all wires from J700-46 (Z400-46,J651-12)

.

b. Connect wire from J800-45 to J400-46.

c. Connect wire from J800-45 to J651-12.

d. Connect wire from J700-46 to J800-47.

14. Power supply connections.

a. Connect +24 volts from 20/24/36 volt power supply

to J800-5 and J800-6.

b. Connect -24 v. power supply (ground) to J800-1

and J800-2.

c. Connect + 5 volt power supply to J800-57 and J800-58.

d. Connect J700-22 to +5 volts on J700-57.

15. Rear panel J658 connections (switch drivers).

a. SW-1. Connect wire fron J658-1 to J800-11.

Connect wire from J658-8 to J800-13.

b. SW-2. Connect wire fron J658-2 to J800-7.

Connect wire from J658-9 to J800-9.

c. SW-3. Connect wire fron J658-3 to J800-15.

Connect wire from J658-10 to J800-17.

d. SW-4. Connect wire fron J658-4 to J800-19.

Connect wire from J658-11 to J800-21.

16. J658 LED indicator lights rear panel cabling.

a. Connect wire from

b. Connect wire from

c. Connect wire from

d. Connect wire from

e. Connect wire from

J658-5 to J800-30.

J658-6 to J800-32.

J658-12 to J800-34.

J658-13 to J800-36.

+5 volts to J658-14.

16
17, Miscellaneous Modifications

a. Install capacitor on Z-100 PC board.

b. Install capacitor on Z-400 PC board.

c. Install capacitor on Z-400 PC board.

d. Replace R423 with 51 ohm resistor 1/4 watt.

5.4 Troubleshooting

If trouble is suspected, check all coaxial cable connectors and I/O

control cables to see that all connectors are properly locked. Determine that

a signal into the ETMS yields an indication on the signal level meter, and

that the signal level can be manually programmed from the ETMS console.

Connect the ETMS directly to the simulated star output, without the

multi -input port module in the RF circuit, and execute the Equipment Check

program to verify the ETMS integrity. Reinstall the multi -input port module

and verify that the station down-converters are set to the desired frequency

and properly phase-locked, and verify that a signal exists on each channel.

If trouble still persists, determine if the problem is in the channel control

circuitry or in one or more channels of the RF circuit. Refer to the

troubleshooting chapters in the maintenance manual if the trouble is in the

control circuits, or to section 6 of this addendum for information on the

multi-input port accessory module RF circuits.

17
5.5 Parts List (Z-800 PC Board)

CATEGORY NO 1 RESISTORS

1 Z8-R1 8 RES FXD CARB 5% 1/4W l.OK OHM AB CB

2 Z8-R2 SAME AS R1 l.OK OHM

3 Z8-R3 8 RES FXD CARB 5% 1/4W 43. OK OHM AB CB

4 Z8-R4 SAME AS R3 43. OK OHM

5 Z8-R5 8 RES FXD CARB 5% 1/4W 4.3K OHM AB CB

6 Z8-R6 SAME AS R5 4.3K OHM

7 Z8-R7 SAME AS R1 l.OK OHM

8 Z8-R8 SAME AS R1 l.OK OHM

9 Z8-R9 SAME AS R3 43. OK OHM

10 Z8-R10 SAME AS R3 43. OK OHM

11 Z8-R11 SAME AS R5 4.3K OHM

12 Z8-R12 SAME AS R5 4.3K OHM

13 Z8-R13 SAME AS R1 l.OK OHM

14 Z8-R14 SAME AS R1 l.OK OHM

15 Z8-R15 SAME AS R3 43. OK OHM

16 Z8-R16 SAME AS R3 43. OK OHM

17 Z8-R17 SAME AS R5 4.3K OHM

18 Z8-R18 SAME AS R5 4.3K OHM

19 Z8-R19 SAME AS R1 l.OK OHM

20 Z8-R20 SAME AS R1 l.OK OHM

21 Z8-R21 SAME AS R3 43. OK OHM

22 Z8-R22 SAME AS R3 43. OK OHM

23 Z8-R23 SAME AS R5 4.3K OHM

24 Z8-R24 SAME AS R5 4.3K OHM

25 Z8-R25 12 RES FXD CARB 5% 1/4W 180 OHM AB CB

26 Z8-R26 SAME AS R25 180 OHM

27 Z8-R27 SAME AS R25 180 OHM

28 Z8-R28 SAME AS R25 180 OHM

29 Z8-R29 SAME AS R25 180 OHM

30 Z8-R30 SAME AS R25 180 OHM

31 Z8-R31 SAME AS R25 180 OHM

18
32 Z8-R32 SAME AS R25 180 OHM

33 Z8-R33 SAME AS R25 180 OHM

34 Z8-R34 SAME AS R25 180 OHM

35 Z8-R35 SAME AS R25 180 OHM

36 Z8-R36 SAME AS R25 180 OHM

37 Z8-R37 1 RES FXD CARB 5% 1/4W 47. OK OHM

CATEGORY NO. 2 CAPACITORS

1.0 UF SPRG 5C023105X025053

1.0 UF

1.0 UF

1.0 UF

1 Z8-C14 CAP CERAMIC MONO 50V

2 Z8-C2 SAME AS Cl

3 Z8-C3 SAME AS Cl

4 Z8-C4 SAME AS Cl

CATEGORY NO. 3

1 Z8-Q1

2 Z8-Q2

3 Z8-Q3

4 Z8-Q4

5 Z8-Q5

6 Z8-Q6

7 Z8-Q7

00 Z8-Q8

9 Z8-Q9

10 Z8-Q10

11 Z8-Q11

12 Z8-Q12

13 Z8-Q13

14 Z8-Q14

15 Z8-Q15

16 Z8-Q16

TRANSISTORS

TRANSISTOR SILICON PNP

SAME AS Q1

TRANSISTOR SILICON NPN

SAME AS Q3

SAME AS Q1

SAME AS Q1

SAME AS Q3

SAME AS Q3

SAME AS Q1

SAME AS Q1

SAME AS Q3

SAME AS Q3

SAME AS Q1

SAME AS Q1

SAME AS Q3

SAME AS Q3

2N4919 MOT 2N4919

2N4919

2N4922 MOT 2N4922

2N4922

2N4919

2N4919

2N4922

2N4922

2N4919

2N4919

2N4922

2N4922

2N4919

2N4919

2N4922

2N4922

19
CATEGORY NO. 4 DIODES

1 Z8-D1 8 DIODE :SILICON lOOV 1N4153 MOT 1N4153

2 Z8-D2 SAME AS D1 1N4153

3 Z8-D3 8 DIODE ;ZENER SI 36V 1N5258 MOT 1N5258A

4 Z8-D4 SAME AS D3 1N5258

5 Z8-D5 SAME AS D1 1N4153

6 Z8-D6 SAME AS D1 1N4153

7 Z8-D7 SAME AS D3 1N5258

8 Z8-D8 SAME AS D3 1N5258

9 Z8-D9 SAME AS D1 1N4153

10 Z8-D10 SAME AS D1 1N4153

11 Z8-D11 SAME AS D3 1N5258

12 Z8-D12 SAME AS D3 1N5258

13 Z8-D13 SAME AS D1 1N4153

14 Z8-D14 SAME AS D1 1N4153

15 Z8-D15 SAME AS D3 1N5258

16 Z8-D16 SAME AS D3 1N5258

CATEGORY NO. 5 INTEGRATED CIRCUITS

1 Z8-IC1 5 INT. CRKT. 1/10 DECODE 7442N TI SN7442N

2 Z8-IC2 2 INT. CRKT. HEX BUSS DVR 8T97 SGNT 8T97-N

3 Z8-IC3 1 INT. CRKT. QUAD-NOR 74LS02N TI SN74LS04N

4 Z8-IC4 SAME AS IC2 8T97

5 Z8-IC5 1 INT. CRKT. QUAD LATCH 74LS175N TI SN74175N

6 Z8-IC6 SAME AS ICl 7442N

7 Z8-IC7 1 INT. CRKT. ONE-SHOT 74121N TI SN74121N

8 Z8-IC8 SAME AS ICl 7442N

9 Z8-IC9 SAME AS ICl 7442N

10 Z8-IC10 2 INT. CRKT. HEX INVTR 7404N TI SN7404N

11 Z8-IC11 SAME AS ICl 7442N

12 Z8-IC12 SAME AS I CIO 7404N

20
CATEGORY NO. 10 HARDWARE

1 Z8-B1 1 PC BRD FOR COAX SW DVR NBS PC-Z800

2 Z8-H1 16 SCREW 4-40X1/4 1/4

3 Z8-H2 16 NUT 4-40

4 Z8-H3 16 LOCK WASHER STAR 4-40

CATEGORY NO. 12 SUBASSEMBLIES

1 Z8 1 COAX SW DRIVER PC CARD NBS Z800

5.5.1 Parts List Additions (ETMS Console)

ADD TO CATEGORY NO. 6, ETMS Maintenance Manual page number 58.

32 Z-J648 1 CONN PC EDGE (Z-800) 60 PIN SAME AS Z-J646

33 Z-J558 1 CONN BLUE RIBBON I/O 14 PIN SAME AS Z-J651

ADD TO CATEGORY NO. 10, ETMS Maintenance Manual page number 60.

26 Z-H25 1 CARD GUIDE PC, FRONT NBS

27 Z-H26 1 CARD GUIDE PC, REAR NBS

28 Z-H27 1 MOUNT PLATE, STEP ATTNR NBS

21
5.6 Wiring List

WIRING LIST

J-400 REVISED

ANALOG GND 1 2 ANALOG GND

+36 VOLTS 3 4 +36 VOLTS

+24 VOLTS 5 6 +24 VOLTS

7 8 PGM ATNR 8+

9 10 PGM ATNR 8-

REF ATNR-2 11 12 PGM ATNR 4+

REF ATNR-1 13 14 PGM ATNR 4-

Z500-50 15 16 PGM ATNR 2+

RF ON -2 17 18 PGM ATNR 2-

Z500-52 19 20 PGM ATNR 1+

RF ON -1 21 22 PGM ATNR 1-

23 24

25 26

27 28

29 30

31 32

Z500-55 33 34

35 36

37 38 Z800-31

39 40 Z800-33

FP 49 41 42 Z800-42

FP 29 43 44 Z800-41

Z500-47 45 46 Z800-45

FP 51 47 48 FP 25

Z800-53 49 50 Z800-48

Z800-55 51 52 Z800-51

Z700-56 53 54 Z700-54

J650-20 55 56 J651-13

+5 VOLTS 57 58 +5 VOLTS

GND 59 60 GND

22
5.7 Wiring Lis

J-700 REVISED

ANALOG GND 1

3

+24 VOLTS 5

7

9

11

13

S656-NC TTL-NAl 15

S656-N0 TTL-NAl 17

S657-NC TTL-NA2 19

S657-N0 TTL-NA2 21

J650-16 23

Z800-38 25

FP 10 27

J650-11 29

Z800-40 31

FP 8 33

J650-12 35

Z800-44 37

FP 12 39

Z800-43 41

FP 14 43

J650-9 45

J650-10 47

FP 15 49

FP 16 51

J650-19 53

J650-17 55

+5 VOLTS 57

GND 59

ANALOG GND

+24 VOLTS

J654 NOISE-ADD #2

J653 NOISE-ADD #1

FP 3

FP 1 Z700-57

Z800-50

J650-15

FP 2

Z800-52

J650-13

FP 6

Z800-56

J650-14

FP 14

Z800-54

Z800-47

FP 19

Z800-46

Z400-45

Z400-54

Z400-53

+5 VOLTS

GND

t

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

46

48

50

52

54

56

58

60

23
5.8 Wiring List

J-800

-24 VOLTS(GND) 1 2 -24 VOLTS (GND)

3 4

+24 VOLTS 5 6 +24 VOLTS

J658-2 7 8

J658-9 9 10

J658-1 11 12

J658-8 13 14

J658-3 15 16

J658-10 17 18

J658-4 19 20

J658-11 21 22

23 24

25 26

27 28

29 30 J658-5

Z400-38,J651-4 31 32 J658-6

Z400-40,J651-3 33 34 J658-12

35 36 J658-13

37 38 Z700-25

39 40 Z700-31

Z400-44,J651-1 41 42 Z400-42,J651-2

Z700-41 43 44 Z700-37

Z400-46,J651-12 45 46 Z700-50

Z700-46 47 48 Z400-50

Data bit H,No Conn 49 50 Z700-24

Z400-52,J651-8 51 52 Z700-30

Z400-49,J651-6 53 54 Z700-42

Z400-51,J651-5 55 56 Z700-36

+5 VOLTS 57 58 +5 VOLTS

GND 59 60 GND

24
5.9 Wiring List

J-651 REVISED

Z800-41 DATAl 1 8 Z800-51

Z800-42 DATA2 2 9

Z800-33 DATA4 3 10

Z800-31 DATA8 4 11

Z800-55 DATA16 5 12 Z800-45 CTL STROBE

Z800-53 DATA32 6 13 Z400-56 MUX FLAG

GND 7 14 +5 VOLTS

5.10 Wiring List

J-658

Z800-11 1 8 Z800-13

Z800-7 2 9 Z800-9

Z800-15 3 10 Z800-17

Z800-19 4 11 Z800-21

Z800-30 5 12 Z800-34

Z800-32 6 13 Z800-36

7 14 +5 VOLTS

25

NM MY

29

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JT. T.». •e.,.1 'TAV

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.. .. .^ ....

1—

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Z1W80

Figure 3. Z800 PC Card Parts Layout,

29
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6. MULTI-INPUT PORT MODULE-INSTRUCTION MANUAL

6.1

Introduction

The multi-input port module, figure 4, is an accessory to the ETMS which

permits connection of up to three RF inputs which may be remotely selected by

the ETMS system. The module is located at the earth terminal IF patch panel near the down-converter outputs. It is connected to the ETMS via a single

coaxial cable and a control cable. The ETMS can be used in the single input

mode without connecting the multi -input module using either the original

software or the revised software.

The ETMS control codes to select inputs one, two, or three either from the

front panel or from the computer are #127, #126, and #125 respectively.

6.2

Module Description

Two magnetically latched double-throw coaxial relays connected to form a relay "tree" are mounted in a small enclosure having a support-loop on the cover. The relays connect any one of the three coaxial inputs to the output

coaxial connector. The relays are controlled via a permenantly attached

control cable which plugs into J-658 on the rear panel of the ETMS. LED

indicators on the cover are positioned adjacent to each coaxial input to

display the currently selected input.

The module does not house any electronics, only the two bi -polar relay

coils and the LED indicators. All control circuitry is contained on the Z-800

PC board in the ETMS console.

6.3

Troubleshooting

If trouble with this module is suspected, check that the control cable is

connected to J-658 and that the connector is properly latched. Determine

whether the problem is an RF continuity problem or a control problem.

31
32

Figure

4.

MultiInput

Relay

flodule.
If the symptom is loss of RF signal, check the coaxial cables and

connectors and verify whether a signal is present at the output of the downconverter. Determine if the loss of signal is common to all input channels or

is only in a single channel. Check any suspect channel by connecting the

questionable input to the simulated star output and observing the signal level

on the ETMS.

If the problem is related to control of the relays, follow the guidelines

given in section 5 in this addendum and the troubleshooting sections of the

ETMS Maintenance Manual.

33
6.4 Parts List Multi-Input Port Module

CATEGORY NO. 3 DIODES

1 Tl-Dl 3 LED DIODE TI

2 T1-D2 SAME AS D1

3 T1-D3 SAME AS D1

CATEGORY NO. 6 CONNECTORS

1 TI-Jl 1 COAXIAL ADAPTER TYPE N UG 57B/U

2 T1-J2 1 COAXIAL ADAPTER TYPE N UG 30D/U

CATEGORY NO. 8 SWITCHES

1 Tl-Sl 2 RELAY SWITCH, COAXIAL TYPE N HP 8665

2 1-S2 SAME AS SI

CATEGORY NO. 10 HARDWARE

1 Tl-Hl 1 BASE PLATE, MODULE NBS

2 T1-H2 1 COVER, MODULE NBS

3 T1-H3 1 ESCUTCHEN, MODULE NBS

4 T1-H4 4 SCREW, FLATHEAD 3/8X6-32

5 T1-H5 4 SCREW, FLATHEAD 3/8X4-40

6 T1-H6 8 SCREW, FLATHEAD 1/2X4-40

7 T1-H7 1 CABLE STRAP, 3/8 IN.

34
6.5 Wiring List

Relay Module Control Cable

P-658 MULTI-INPUT MODULE

1 SWITCH # 1 (+)

2 SWITCH # 2 (+) * 3 SWITCH # 3 (+)

4

5 LED (INPUT # 1)

6 LED (INPUT # 2)

78 SWITCH # 1 (-)

9 SWITCH # 2 (-) * 10 SWITCH # 3 (-)

11

12 LED (INPUT # 3) * 13 LED (INPUT # 4)

14 +5 VOLTS TO +LED'S

* These items used on prototype only.

35
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FIGURE

5.

Multi-Input

Relay

Module

Schematic

Diagram
37

Figure

6.

Relay

Module

Parts

Location.
6.6 Spare Parts Additions

Please store the following items in the spare parts supply case, and add these

to the spare parts list on page 203 of the maintenance manual.

Add to spare parts:

1. Z800 PRINTED CIRCUIT BOARD

2. T1-S1/T1-S2 COAXIAL SWITCH

3. ETMS INSTRUCTION MANUAL ADDENDUM

7. REFERENCES

[1] Wait, D. F., ETMS Operations Manual, NBSIR 78-879 , (Dec. 1977).

[2] Wakefield, J. P., ETMS Maintenance Manual, NBSIR 78-895, (Sept. 1978).

[3] Larsen, N. T., A new self-balancing D-C substitution rf power meter, IEEE

Transactions on Instrumentation and Measurement IM-25, No. 4, 343-347

(Dec. 1976).

38
8. ETMS CONTROL CODES

Program Switches and WBYTE

CODE FUNC7ION

^4 DVM' AUlU RANGE

27 DVM 0.1 RANGE

28 DVM 1.0 RANGE

29 DVM 10.0 RANGE

30 DVM 100.0 RANGE

31 DVM 1000.0 RANGE

32 DVM DC VOLTS FILTER 01 33 DVM DC VOLTS FILTER If 34

35 DVM RATIO-NOT USED IN

48 PROG ATTNR 15 dB

49 PROG ATTNR 14 dB

If II M

^ M

62 PROG ATTNR 1 dB

63 PROG ATTNR 0 dB

64 RF OFF/6 dB STEP IN

65 RF ON/6 dB STEP OUT

66 6 dB STEP IN

67 6 dB STEP OUT

68 RF OFF

69 RF ON

80 NOISE ADD ON

81 NOISE ADD OFF

82 NOISE ADD #2 ON

83 NOISE ADD #2 OFF

84 NOISE ADD #1 ON

85 NOISE ADD #1 OFF

100 INPUT CHANNEL #11 DVM

101 INPUT CHANNEL #10 DVM

102 INPUT CHANNEL # 9 DVM

103 INPUT CHANNEL # 8 DVM

104 INPUT CHANNEL # 7 DVM

105 INPUT CHANNEL # 6 DVM

106 INPUT CHANNEL # 5 DVM

107 INPUT CHANNEL # 4 DVM

108 INPUT CHANNEL # 3 DVM

109 INPUT CHANNEL # 2 DVM

no INPUT CHANNEL # 1 DVM

111 INPUT CHANNEL # 0 DVM

124 INPUT #4

125 INPUT #3

126 INPUT #2

127 INPUT #1

39
9. REVISIONS AND ERRATA FOR ETMS MAINTENANCE MANUAL

9.1 Revisions and Retrofit

Please make the following additions to your ETMS MAINTENANCE MANUAL:

Page vi

a. Add on line 5.9:

ALSO see revisions in Addendum, Paragraphs 5.5 and 5.5.1.

b. Add on line 5.10:

ALSO see revisions in Addendum, paragraphs 5.6 through 5.10.

Page vii

Place the following notation at bottom of page vii:

NOTE: See Addendum for Retrofit and Revisions to add multiple input-Port

switching to the ETMS.

Page viii

a. Paragraph #10, add:

10.3 Cable Wiring List (Multi Input Port) Addendum, Paragraph 6.5.

b. In Appendix C, change "page 211" to read "Addendum, Paragraph 8.0."

40
c. Add the following items to bottom of page viii:

Addendum Figure 1.

Addendum Figure 2.

Addendum Figure 3.

Addendum Figure 4.

Addendum Figure 5.

Addendum Figure 6.

Multi-input port control pc card Z800

Z800 schematic diagram

Z800 pc card parts layout

Multi-input relay module

Relay module schematic

Relay module parts layout

Page 58

Add note to end of Category # 6:

NOTE: See additional items in Addendum, Paragraph 5.5.1, Category

#6 .

Page 60

Add note to end of Category #10:

NOTE: See additional items in Addendum, Paragraph 5.5.1, Category

# 10 .

Page 72

Add notation to bottom of page 72:

NOTE: See Z800 P.C. Card Parts List i Addendum, Paragraph 5.5,

Categories #1 through #12.

Page 74

Place large note across Table J-400:

Revised - see Addendum, Paragraph 5.6.

41
Page 76

Place large note across Table J-700:

Revised - see Addendum, Paragraph 5.7.

Page 77

Make the following three notations on page 77:

a. Top of page 77:

NOTE: See Addendum, Paragraph 5.8 for Wiring Table J-800.

b. Place note across Table J-651:

Revised - See Addendum, Paragraph 5.9.

c. Bottom of page 77:

NOTE: See Wiring Table J-658 in Addendum, Paragraph 5.10.

Page 90

Add note to top of page 90:

NOTE: Z800 P.C. card (coaxial switch driver) schematic and parts

layout are included in Addendum, Figure #2 and #3.

Page 203

Add to spare parts list:

1 - Z800 P.C. card

1 - Coaxial relay (Tl-Sl, S2)

1 - Addendum - Maintenance Manual Update

42
Page 211

Place large note across Table on page 211:

NOTE: See Addendum to ETMS MAINTENANCE MANUAL, Paragraph 8.0, for

revised and corrected ETMS Control Codes.

9.2 Errata to ETMS MAINTENANCE MANUAL

Please make the following corrections to your ETMS MAINTENANCE MANUAL.

Page 13

Control codes should read:

Code 82 Noise - Add #2 ON

Code 83 Noise - Add #2 OFF

Code 84 Noise - Add #1 ON

Code 85 Noise - Add #1 OFF

Page 16

Top of page first sentence should read: —Codes 83 and 82 (NA#2),— —or 85 and 84 (NA#1),--

Page 49

Table 1 should read:

o

r-—

i

00 CM NC ON

83io NC OFF

o

00 ON NC

85io OFF NC

43
Page 50

Revise Table II as follows:

a. Change all J1 to J653.

Change all J2 to J654.

Change all JIO to J656.

Change all J20 to J657.

b. And in the paragraph below table; also change SIO to S-656 and S20

to S-657.

c. Change table entries as follows:

o

00 CVJ NC NC ON +24V +4V ON

83io NC NC OFF +0.5V +0.7V OFF

84l0 ON +24V +4V ON NC NC

85io OFF +0.5V +0.7V OFF NC NC

Page 54

Step #8, second sentence - change "External" to "ETMS" and the control

code to #69.

Page 55

Step #13: change control code to #69.

Page 76

J-700 wiring list: correct J-700-40 to connect to FP 4.

44
Page 117

J-352 wiring list: connect J-352 pins 44, 45 and 46 to ground.

Page 161

Figure 30.

a. Connect an external potentiometer (20 Kohms) across R6.

b. Connect an external potentiometer (20 Kohms) across R36.

c. Reverse polarities shown for CIO and C40.

Page 193

I/O Cable Wiring List

Connect J-352 pins 44, 45 and 46 to ground. (Not YlOO-3).

END of ERRATA as of October 1979

^5
NBS-114A IREV. 2-80

U.S. DEPT. OF COMM. 1. PUBLICATION OR

REPORT NO.

2. Performing Organ. Report No. 3. Publication Date BIBLIOGRAPHIC DATA

October 1981 SHEET (See instructions) NBSIR 81-1641

4. TITLE AND SUBTITLE

Addendum to Earth Terminal Measurement System Maintenance Manual

5. AUTHOR(S)

John P. Wakefield

6. PERFORMING ORGANIZATION (If joint or other than NBS, see instructions) 7. Contract/Grant No. national bureau of standards

DEPARTMENT OF COMMERCE 8. Type of Report & Period Covered

WASHINGTON, D.C. 20234 ACC-414-74

TER 20-79A2

9. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street. City. State, ZIP)

United States Army Communications Command

Fort Huachuca, Arizona 85613

10. SUPPLEMENTARY NOTES

Document describes a computer program; SF-185, FIPS Software Summary, is attached.

11. ABSTRACT {A 200-word or less factual summary of most significant information. If document includes a significant

bibliography or literature survey, mention it here) This addendum to the Earth Terminal Measurement System Maintenance Manual,

NBSIR 78-895, describes the equipment and maintenance procedures required to support the retrofit package for the Earth Terminal Measurement System (ETMS) developed by the National Bureau of Standards. This retrofit adds a multi-inputport relay module which provides the capability of connecting three receiver channels to the ETMS, thereby enabling measurement of pertinent earth terminal parameters at as many as three frequencies in a single measurement pass. This manual

does not include measurement theory nor measurement operating procedures that are described in the Earth Terminal Measurement System Operation Manual, NBSIR 78-879.

12. KEY WORDS (Six to twelve entries; alphabetical order; capitalize only proper names; and separate key words by semicolon s) Earth terminal; earth terminal measurement system; figure of merit; noise temperature; satellite communication

13. AVAILABILITY 14. NO. OF

PRINTED PAGES

Unlimited

1 1 For Official Distribution. Do Not Release to NTIS 48

Order From Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. 15. Price

Order From National Technical Information Service (NTIS), Springfield, VA. 22161 $6.50

USCOMM-DC 6043-P8

U.S. GOVERNMENT PRINTING OFFICE; 1981— 576-001/1212Region No. 8