Military Surplus rigs AN-PRC-70 User guide

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ARMY

TM 11-5820-553-10

NAVY EE150-SN-OPl-010/E110-PRC 70

OPERATOR’S MANUAL

RADIO SET AN/PRC-70

(NSN 5820-01-062-8246)

This copy is a reprint which includes current pages from Changes 1 and 2.

DEPARTMENTS OF THE ARMY AND THE NAVY

19 FEBRUARY 1982

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

WARNING

Serious injury or death could result to personnel if the whip antenna comes in contact with power lines.

When operating in HI PWR with the whip antenna, DO NOT TOUCH the antenna when in transmit mode—an RF burn can result.

This decal is located near the WIRE terminal and WHIP antenna on the front panel of the radio set. It is applicable to BOTH long wire and whip antenna usage.

WARNING

Adequate ventilation should be provided while using TRICHLOROTRIFLUOROETHANE. Prolonged breathing of vapor should be avoided. The solvent should not be used near heat or open flame; the products of decomposition are toxic and irritating. Since TRICHLOROTRIFLUOROETHANE dissolves natural oils, prolonged contact with skin should be avoided. When necessary, use gloves which the solvent cannot penetrate. If the solvent is taken internally, consult a physician immediately.

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

WARNING

A potential RF radiation hazard exists when Radio Set AN/PRC-70 is operated in HI PWR, with the whip antenna, either 6 or 9 foot (2 or 3 meters). This hazard is increased when the radio is operated in the portable (backpack) mode. For protection against these hazards, observe the following safeguards:

a. Use a dummy load when operating the radio, if possible, such as when performing Preventive Maintenance Checks and Services (PMCS) to determine equipment readiness/availability.

b. Operate the radio in the off-the-back (fieldemplaced) mode, if possible, using either the doublet or the long-wire antenna.

c. If a whip antenna must be used for transmissions in the field-emplaced mode, use a microphone cable long enough to maintain a distance of at least 1.7 feet (50 centimeters) from the antenna.

d. If the radio must be operated in the portable (onthe-back) mode, use LO PWR or do not transmit for longer than 30 seconds out of any 6-minute interval.

CAUTION

Do not attach antenna to this unit if high power transmitters in the range 2-76 MHz are being operated within 200 feet.

Change 1

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

CAUTION

FREQUENCY STABILITY CHECK

The AN/PRC-70 radio requires a radio frequency stability check annually. Refer to your organizational maintenance schedule to ensure your radio does not become due for this check during a mission.

CAUTION

Handcrank Generator G-76/G must be producing power BEFORE the AN/PRC-70 is turned on. Failure to do this may damage the radio.

Change 1

TM 11-5820-553-10

SAFETY STEPS TO FOLLOW IF SOMEONE IS THE VICTIM OF ELECTRICAL SHOCK

DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL

IF POSSIBLE

, TURN OFF THE ELECTRICAL POWER

IF YOU CANNOT TURN OFF THE ELECTRICAL POWER, PULL, PUSH, OR LIFT THE PERSON TO

SAFETY USING A WOODEN POLE OR A ROPE OR

SOME OTHER INSULATING MATERIAL SEND FOR HELP AS SOON AS POSSIBLE

AFTER THE INJURED PERSON IS FREE OF CONTACT WITH THE SOURCE OF ELECTRICAL

SHOCK, MOVE THE PERSON A SHORT DISTANCE AWAY AND IMMEDIATELY START ARTIFICIAL RESUSCITATION

TM 11-5820-553-10

EE150-SN-OPI-01B/E110-PRC 70

CHANGE

DEPARTMENTS OF THE ARMY

AND THE NAVY

NO. 2

Washington, DC, 1 August 1987

OPERATOR’S MANUAL

RADIO SET AN/PRC-70

(NSN 5820-01-062-8246)

TM 1l-5820-533-10/EE150-SN-OPI-010/E110-PRC 70, 19 February 1982 is changed as follows:

1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised

illustrations are indicated by a vertical bar adjacent to the identification number.

Remove pages

i through iv . . . . . . . . . . . . . . . . . .

1-1 and 1-2 . . . . . . . . . . . . . . . . . . . .

1-5 through 1-10 . . . . . . . . . . . . . . .

2-3 AND 2-4 . . . . . . . . . . . . . . . . . . .

2-11 and 2-12 . . . . . . . . . . . . . . . . . .

2-15 through 2-26 . . . . . . . . . . . . . .

4-3 and 4-4 . . . . . . . . . . . . . . . . . . . .

4-7 through 4-10 . . . . . . . . . . . . . . .

4-17/(4-18 blank) . . . . . . . . . . . . . . .

A1 and A2 . . . . . . . . . . . . . . . . . .

Insert pages

i through iv

1-1 and 1-2

1-5 through 1-10 2-3 and 2-4 2-11 and 2-12 2-15 through 2-26 4-3 and 4-4 4-7 through 4-10 4-17/(4-18 blank) A1 and A2

2. File this change sheet in front of the publication for reference purposes.

Distribution authorized to the Department of Defense and DOD contractors only for official use or for administration or operational purposes. This determination was made on 26 March 1987. Other requests for this document will be referred Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-ME-P, Fort Monmouth, NJ 07703-5000.

DESTRUCTION NOTICE–Destroy by any method that will

prevent disclosure of contents or reconstruction of the document.

TM 11-5820-553-10

EE150-SN-OPl-010/E110-PRC 70

TECHNICAL MANUAL NO. 11-5820-553-10

TECHNICAL MANUAL NO.

EE150-SN-OPI-010/E110-PRC 70

DEPARTMENTS OF THE

ARMY AND THE NAVY

Washington, DC, 19 Feb 82

OPERATOR’S MANUAL RADIO SET AN/PRC-70

(NSN 5820-01-062-8246)

REPORTING ERRORS AND

RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form 2028-2 located in back of this manual direct to: Commander Electronics Command and Fort Monmouth, ATTN: AMSEL-ME-MP, Fort Monmouth, New Jersey 07702-5000.

, US Army Communications-

For Navy, mail comments to the Commander Naval Warfare Systems Command, Washington, DC 20363-5100.

In either case, a reply will be furnished direct to you.

Chapter

Section I. General

1. INTRODUCTION

Scope . . . . . . . . . . . . . . . . . . . 1-1

Consolidated Index of Army

Publications and Blank

Forms . . . . . . . . . . . . . . . . . . . .1-2

Maintenance Forms,

Records, and Reports . . . . . . . .1-3

Reporting Equipment Im-

provement Recommendations

(EIR) . . . . . . . . . . . . . . . . .... . . . . . . . . . . 1-4

Warranty Information . . . . . . . .1-5

II. Description and Data

Equipment Characteristics,

Capabilities, and Features . . . . .1-6

EE150-SN-OPI-01B/E110-PRC 70/Change 2

ATTN: SPAWAR8122,

, Space and

Paragraph

Page

1-1

1-2 1-2

1-2

TM 11-5820-553-10

Chapter 2

Section I.

Section II.

III.

IV.

Paragraph

Location and Description

of Major Components.

System Application. . . . .

Tabulated Data . . . . . . .

OPERATING

INSTRUCTIONS Controls and Indicators Damage From Improper

Settings . . . . . . . . . . . . .

Operator/Crew Controls Operation Under Usual

Conditions

Types of Operation . . . . .

Preliminary Starting

Procedures . . . . . . . . . .

Portable Configuration.

Fixed Configuration. . . . .

Initial Adjustments. . . . .

Operating Procedures . . . Operation Under Unusual

Conditions Operation Under Emer-

gency Conditions . . . . .

Recognition and Identi-

fication of Jamming . . .

Antijamming Procedures . . . . . . . . 2-11

Preparation for Movement Portable Configuration

Movement . . . . . . . . . . . . . . . . . . . . .2-12

Fixed Congifuration

Movement . . . . . . . . . . . . . . . . . . . . 2-13

Fixed Voice Configura-

tion Movement . . . . . . . . . . . .2-14

CW or FSK Configuration

Movement . . . . . . . . . . . . . . . . . . . . . 2-15

Retransmit Configuration

Movement . . . . . . . . . . . . . . . . . . . . . . 2-16

. . . . 1-7

1-8

. . . .

1-9

. . . .

2-1 2-2

2-3

2-4

. . .

. . . . 2-5

. . . . 2-6

. . . . 2-7

. . . 2-8

. . . 2-9

2-10

Page

1-3 1-7 1-7

2-1 2-1

2-5

2-5 2-5 2-7 2-15 2-15

2-21

2-23 2-24

2-26

2-27

2-28

Chapter 3.

Section I.

MAINTENANCE

INSTRUCTIONS Tools and Equipment

General. . . . . . . . . . . . . . . . . . . . . .3-1

II.

Lubrication Instructions

General . . . . . . . . . . . . . . . . . . .. . . . . . .3-2

3-1

TM 11-5820-553-10

III.

IV.

Chapter 4.

Section I.

II.

Preventive Maintenance

Checks and Services

(PMCS)

General . . . . . . . . . . . . . . . . . . . .3-3

Preventive Maintenance

Checks and Services. . . . . . . .3-4

Maintenance of the Radio

Set . . . . . . . . . . . . . . . . . . . . ..3-5

Troubleshooting

General . . . . . . . . . . . . . . . . . . .3-6

Maintenance of Radio Set

General . . . . . . . . . . . . . . . . . . .3-7

MATERIEL USED IN

CONJUNCTION WITH

MAJOR ITEM

General List of Auxiliary Equip-

merit . . . . . . . . . . . . . . . . . . . . 4-1

Installation Instruc-

tions for Auxiliary

Equipment

Voice Security Equip-

ment Configuration . . . . . . . .4-2

Code Burst and CW

Configuration . . . . . . . . . . . . .4-3

Digital Message Device Group

OA-8990 Configuration . . . . . . . . 4-4

Handcrank Generator

Configuration . . . . . . . . . . . . . . . . .4-5

Power Supply Configuration . . . . . 4-6

Paragraph

Page

3-1

3-2

3-3

4-1

4-4

4-8

4-10 4-14

Appendix A.

Section I.

II.

Section I.

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

COMPONENTS OF END

ITEM LIST . . . . . . . . . . . . . .

Introduction . . . . . . . . . . . . . . . .

Integral Components of

End Item . . . . . . . . . . . . . . . . .

ADDITIONAL AUTHORI-

ZATION LIST

Introduction . . . . . . . . . . . . . . . .

Additional Authorization

II.

List . . . . . . . . . . . . . . . . . . . . .

A-1

B-1

B-3

C-1

C-2

Change 2 iii

TM 11-5820-553-10

Section

Number

1-1

1-2 2-1 2-2

2-3 2-4 2-5 4-1 4-2 4-3

4-4

4-5

4-6

D. EXPENDABLE SUPPLIES

AND MATERIALS LIST

I. Introduction . . . . . . . . . . . . . . . .

II. Expendable Supplies and

Material List . . . . . . . . .

. . . . .

Paragraph

Page

D-1

D-2

LIST OF ILLUSTRATIONS

Title

Radio Set AN/PRC-70 . . . . . . . . . . .

Contents of Accessory Carrying Bag . .

RT-1133/PRC-70 Controls. Radio Set AN/PRC-70 Portable Con-

figuration . . . . . . . . . . . . . . . . . . . 2-6

Doublet Antenna AS-2975/PRC-70 . . . . . . . . . . . . 2-8

Long Wire Antenna Configuration . . . . . . . 2-11

Retransmit Configuration . . . . . . . . . . . . . . . . 2-13

Voice Security Equipment Configuration 4-2

CW Configuration . . . . . . . . . . . . 4-5

Digital Message Device Group (DMDG),

OA-8990/P Configuration . . . . 4-8

Handcrank Generator, G-76/G Con-

figuration, . . . . . . . . . . . . . . . . 4-10

Battery Charging with

Generator G-76/G . . . . . . . . . . . . . . . . . . 4-12

Power Supply, PP-6148/U Configuration 4-16

Handcrank

Page

1-4 1-5

2-2

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

CHAPTER 1

INTRODUCTION

Section I. GENERAL

1-1. Scope

This manual contains operator instructions for Radio

Set AN/PRC-70. Equipment description, installation instructions, and maintenance duties for the operator

are included in the manual. Operating and maintenance

instructions for the auxiliary equipment used with the

AN/PRC-70 are contained in separate technical manuals. Refer to appendix A for a listing of these manuals.

1-2. Consolidated Index of Army Publications and

Blank Forms

Refer to the latest issue of DA Pam 310-1 to determine whether there are new editions, changes or additional publications pertaining to the equipment.

1-3. Maintenance Forms, Records, and Reports

a. Reports of Maintenance and Unsatisfactory

Equipment. Department of the Army forms and pro-

cedures used for equipment maintenance will be those prescribed by DA Pam 738-750, as contained in Maintenance Management Update. Navy personnel will

report maintenance performed utilizing the

Maintenance Data Collection Subsystem (MDCS) IAW OPNAVINST 4790.2, Vol 3 and unsatisfactory

material/conditions (UR submissions) IAW OP-

NAVINST 4790.2, Vol 2, chapter 17.

b. Report of Packaging and Handling Deficiencies.

Fill out and forward SF 364 (Report of Discrepancy

ROD)) as prescribed in AR 735-11-2/DLAR 4140.55/ NAVMATINST 4355.73B/AFR 400-54/MCO 4430.3H.

Change 2

1-1

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

Discrepancy in Shipment Report (DISREP) (SF

361). Fill out and forward Discrepancy in Shipment

Report (DISREP) (SF 361) as prescribed in AR 55-38/ NAVSUPINST 4610.33C/AFR 75-18/MCO P4610 .19D/DLAR 4500.15.

1-4. Reporting Equipment Improvement

Recommendations (EIR)

a. Army. If your Radio Set AN/PRC-70 needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don’t like about the design. Put it on an SF 368 (Quality Deficiency Report). Mail it to Commander, US Army Communications—Electronics Command and Fort Monmouth, ATTN: AMSEL—PA—MA—D, Fort Monmouth, New Jersey 07703—5000. We’ll send you a reply.

b. Navy. Navy personnel are encouraged to submit

EIR's through their local Beneficial Suggestion Pro-

gram.

1-5. Warranty Information

Radio Set AN/PRC-70 is warranted by the contractor for a period of 12 months. It starts on the date of Government acceptance indicated on the appropriate

DD Form 2408-9. Report all defects in material or workmanship to your supervisor who will take appropriate action through your Organization's maintenance shop.

Section II.

1-6. Equipment Characteristics, Capabilities and

Features (fig. 1-1)

Radio Set AN/PRC-70, referred to hereafter as the radio set, is a medium-to-long-range communications set which operates in the 2 to 76 MHz frequency band. Various configurations of this equipment are possible so that it may be transported by one or two persons or installed at fixed sites such as field headquarters, command posts, etc. The radio set may be operated in all kinds of

1-2

Change 2

DESCRIPTION AND DATA

TM 11-5820-553-10

weather and terrain. Operating modes include amplitude modulation (AM), single sideband (SSB), continuous wave (CW), frequency modulation (FM), and frequency-shift keying (FSK). Provisions are included for the connection of separate security devices to allow secure communications in selected modes. Two radio sets may be connected together

for retransmission purposes.

1-7. Location and Description of Major

Components

The radio set consists of the items shown in figures

1-1 and 1-2. The items not described in separate technical manuals are described in the following subparagraphs.

1-3

TM 11-5820-553-10

1-4

Figure 1-1. Radio Set AN/PRC- 70.

Change 2

1-5

Figure 1-2.

TM 11-5820-553-10

Figure 1-2.

TM 11-5820-553-10

a. Receiver-Transmitter RT-1133/PRC-70. The Receiver-Transmitter RT-1133/PRC-70 (A, fig. 1-1) is the major assembly of the radio set. Receiver-

Transmitter RT-1133/PRC-70 is referred to

hereafter as the RT unit. The RT unit is housed in a metal case and contains the receive and transmit

circuits. Controls for the operator and cable connectors are located on the front panel of the RT unit.

b. Accessory Carrying Bag. The accessory carrying bag (C, fig.1-1) is used for carrying the following items (fig. 1-2):

(1) Handset H-250/U. (2) Headset H-251/U. (3) CW

CX-13101/PRC-70.

(4) Doublet Antenna AS-2975 PRC-70 con-

sisting of:

(a) 5-foot measuring tape. (b) Ground rod. (c) Balun assembly with RG-58 Cable

Assembly.

(d) 25-foot RG-25 Cable Assembly with BNC

adapter.

(e) Halyard assembly (2 each). (f) Wire rope assembly (2 each).

(5) Whip Antenna AS-2974/PRC-70 consisting

of:

(a) 6-foot whip (4 sections). (b) 9-foot whip (6 sections). (c) Swivel antenna base.

c. Maintenance Cable Assembly. This assembly

(B, fig. 1-1) connects the RT unit to a power supply for operating, testing, and troubleshooting the RT unit without a battery.

d. Doublet Antenna AS-2975/PRC-70. This assembly is a half-wave portable antenna that is adjustable for an operating frequency between 2 and

30 MHz and is only used in fixed configurations.

Key KY-116/U

with Cable

1-6

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

e. Whip

assembly consists of a foldable 6-foot antenna, a

foldable 9-foot antenna, and a swivel antenna base.

The 6-foot antenna is used for the 4 to 76 MHz

range and the 9-foot antenna is used for the 3 to 76

MHz range. The whip antenna assembly is required

for portable configurations.

1-8. System Application

The radio set is a lightweight transceiver designed

for manpack use. It operates in the frequency range

of 2 to 76 MHz in AM, CW, SSB, and FSK modes

and from 30 to 76 MHz in FM mode. The radio set

has a long-range communications capability up to

2500 miles (4000 km). The 30 to 76 MHz SSB mode

offers flexibility for setting up communication nets

and links. The built-in antenna coupler is automatic, and provides the best match with whip, long wire, and doublet antenna assemblies.

1-9. Tabulated Data

The following subparagraphs describe the technical data for the radio set. Table 1-1 lists the physical data of the items of the radio set. The relationship between the various modes, frequencies, antenna assemblies and distances are shown in tables 1-2 and 1-3.

a. Receiver-Transmitter RT-1133/PRC-70

Input Voltage . . . . . . . . . . . . . . .+20 to +32 vdc

Power Consumption:

Receive Mode .. . . . . . . . . . . . 7 watts maximum

Low-Power Transmit Mode. . . .50 watts maximum

High-Power Transmit Mode

FSK, CW, FM, AM . . . . . . . . . . 160 watts maximum

SSB . . . . . . . . . . . . . 115 watts maximum

Power Output:

Duty Cycle . . . . . . . . . . . . . .9 to 1 receive-to-transmit

Antenna AS-2974/PRC-70. This

ratio.

Change 2

1-7

TM 11-5820-553-10

High-Power Mode

CW, FM*, FSK. . . . . . . . . . . 21-42 watts average

SSB . . . . . . . . . . . . . . . . . . . . . . .

AM . . . . . . . . . . . . . . . . . . . . . . . 7.5 watts carrier, 7.5

Low-Power Mode . . . . . . . . . .3 watts, +2dB, -2.5 dB

Frequency Range. . . . . . . . . . .2.000 to 75.9999 MHz in

* FM transmit enabled only in 30.0000 to 75.9999 MHz range.

NOTE

A temperature-sensing switch is located in the power amplifier module. If continuous transmission at HI PWR is required during high temperatures the RT unit may switch to lower power (approximately proximately operation. When the temperature is sufficiently reduced the RT unit will automatically return to the higher power level.

Receiver Sensitivity:

FM . . . . . . . . . . . . . . . . . . . 0.60µV

SSB, FSK, CW . . . . . . . . . . . . . 0.375 to

AM . . . . . . . . . . . . . . . . . . . . . .2.50

Receiver Signal-to-Noise

Ratio . . . . . . . . . . . . . . . . . . . .10 dB at referenced

Receiver Selectivity:

FM . . . . . . . . . . . . . . . . . . . . . . . . . .32 kHz at 6dB

SSB, CW, FSK . . . . . . . . . . . . .2.8 kHz at 6 dB

AM. . . . . . . . . . . . . . . . . . . . 6.0 kHz at 6 dB

3 watts) after ap-

10 minutes of such

21-42 watts peak en-

velope power

watts upper sideband. 30 watts PEP at

85%

minimum

100 Hz steps

(varies with frequency)

modulation

0.50

µV

sensitivity

70 kHz at 60 dB

4.0 kHz at 26 dB

6.0 kHz at 60 dB

14.0 kHz at 60 dB

µV

1-8

TM 11-5820-553-10

Doublet Antenna AS-2975/PRC-70

Frequency Range . . . . . . . . . . . . 2 to 30 MHz

(normal range)

Input Impedance. . . . . . . . . . . . 50 ohms

Whip Antenna AS-2974/PRC-70

6- foot section . . . . . . . . . . . . . . 4 to 76 MHz

9-foot section . . . . . . . . . . . . . . .3 to 76 MHz

Table 1-1. Items Comprising an Operable Equipment

Dimensions

Length Depth Width Weight

NSN

Item

5820-01-062-8246 Radio Set

AN/PRC-70 Consisting of:

5820-01-073-9114 Receiver-

Transmitter RT-1133/ PRC-70

5995-01-092-5943 Maintenance

Cable Assembly 1 60 –

Accessory

Carrying

Bag

5985-01-073-5602 Doublet

Antenna

AS-2975/ PRC-70

5985-01-073-5601 Whip An-

tenna AS-2974/ PRC-70

(6 ft) (9 ft)

5965-01-017-0549 Headset

H-251/U 1 8 4

5965-00-043-3463 Handset

H-250/U 1 8 2

5805-00-503-3395 CW Key KY-

116/U

with

(in.) (in.) (in.) (lb.)

Qty

4 11.9 13.25 21.0

1 11 17.5

1 2808 –

72 –

1 108 –

153

–

6.5

—

– 0.75 —

1.00

4 2

0.45

2.0

5.25

0.7

0.5

0.4

Change 2

1-9

TM 11-5820-553-10

Table 1-1. Items Comprising an Operable

NSN

5995-01-073-6123

Equipment- Continued

Length Depth Width Weight

(in.) (in.)

Item

Qty

Cable CX-

Dimensions

13101/ PRC-70 Ground Rod

SMC

746768/800-

45 NOTE 1 18 –

The following equipment is required but not supplied as part of the AN/PRC-70.

6140-01-089-7636 Battery

BB-542/U 1 12.2 2.56 4.0

Table 1-2. Operating Modes, Antennas, and Frequencies

Operating Mode

Antenna Frequency

6-foot whip

30 to 76 MHz

9-foot whip 30 to 76 MHz

CW, FSK, AM, SSB

6-foot whip 9-foot whip Doublet

4 to 76 MHz 3 to 76 MHz 2 to 30 MHz

(normal)

Table 1-3. Operating Modes, Antennas, and Distances

(in.) (lb.)

0.75

0.8

7.0

Mode

Antenna

AS-2975/PRC-70

Distance Range up to 2,500

miles* SSB Voice, AM AS-2975/PRC-70 0–500 miles SSB Voice, FM

AS-2974/PRC-70 AS-2974/PRC-70 0–15 miles AS-2974/PRC-70

0–25 miles

0–15 miles

*Long wire antenna may be used (para 2-6b).

1-10

TM 11-5820-553-10

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. CONTROLS

AND INDICATORS

2-1. Damage From Improper Settings

No damage will result to the equipment from improper control settings at turn-on. Battery life will be shortened by some control settings. Maximum battery drain occurs when the POWER switch is set to HI PWR and the SQUELCH switch is held in the

DIAL LIGHT position. For best battery life use other settings of the controls when possible.

2-2. Operator/Crew Controls

Figure 2-1 shows the RT unit front panel controls. Table 2-1 lists the operator controls, indicators, and connectors and describes their functions.

CAUTION

Do not change front panel controls while RT unit is transmitting.

2-1

TM 11-5820-553-10

Figure 2-1.

2-2

Figure 2-1.

TM 11-5820-553-10

Table 2-1. Controls, Indicators and Connectors

Control, indicator,

or connector

Function

POWER switch Sets major functions of RT-l133/PRC-

70 as follows:

Positions:

OFF RCV ONLY LO PWR

Removes all power from RT unit. Applies power to receive circuits only, Allows transmission in low-power mode

when transmitter is keyed. Output is

approximately 3 watts,

HI PWR

Allows transmission in high-power mode

when transmitter is keyed. Output is approximately 30 watts.

TUNE Starts automatic tuning sequence in unit

to tune antenna coupler. Switch is spring loaded in this position and returns to HI PWR position when

released.

MODE switch

Selects operating mode of unit. Modes

are CW, FSK, AM, SSB, and FM*. * Transmit enables only in 30.0000 to 75.9999 MHz range. VOLUME control

SQUELCH switch

Sets volume of received audio.

Controls operation of receiver squelch

and unit dial lights as follows:

Positions:

RXMT

Actuates switching circuit which con-

trols second RT-1133/PRC-70 in

retransmit mode.

OFF ON

Disables squelch circuit. Enables receiver squelch in voice modes.

Squelch is disabled if MODE switch is set to CW or FSK.

DIAL LIGHT

Momentary switch position; applies

power to dial lights. Switch returns to ON position when released.

RXMT connector

Connects

unit to second RT unit

RT-1133/PRC-70 in retransmit mode.

Connects CW Key KY-116/U for CW or

FSK operation.

AUDIO connector

Connects Handset H-250/U to RT unit

for normal voice operation and Headset H-251/U during CW or FSK operation.

X-MODE

connector

Connects voice security applique to unit

for secure voice operation.

2-3

TM 11-5820-553-10

Table 2-1. Controls, Indicators and Connectors–Continued

Control. indicator

or connector

CAUTION

Dummy shorting caps for AN/PRC-70 and AN/PRC-77 are not interchangeable.

NOTE

Shorting cap must be connected to connector at all times when voice security applique is not being used or power to RT unit will be interrupted.

ANT connector

Installing the coax connector of the doublet antenna to the antenna connector removes all R.F. power from the wire connector post.

WHIP connector

Installing the antenna swivel base to the whip connector removes all R.F. power from the antenna and

wire connectors.

WIRE connector GND connector

FREQUENCY

selector controls

and indicators:

A B C D E F

Connects feedline for Doublet Antenna

AS-2975/PRC-70 to RT unit.

NOTE

Connects whip Antenna AS-2974/PRC-70 to

RT unit.

NOTE

Connects random wire length antennas to

RT unit. Connects ground wire to RT unit. Operating frequency is changed by rotat-

ing frequency selector controls while observing frequency readout numerals. FM transmit is disabled by these

controls below 30.0000 MHz setting. Megahertz tens selector Megahertz unit selector Kilohertz hundreds selector Kilohertz tens selector Kilohertz units selector Hertz hundreds selector

Function

2-4

Change 2

TM 11-5820-553-10

Section II. OPERATION UNDER

USUAL CONDITIONS

2-3. Types of Operation

Two types of operation are possible using the radio set: portable and fixed configurations. Refer to Chapter 4, Section II, for the installation and operation

of configurations

using

auxiliary

equipment.

2-4. Preliminary Starting Procedures

Before operating the radio set, set controls as follows:

Control

POWER switch MODE switch VOLUME control SQUELCH switch

FREQUENCY selector

controls

OFF Operating mode desired Midrange OFF

Operating frequency desired

Setting

2-5. Portable Configuration

Figure 2-2 shows the portable configuration. For operation in this configuration, assemble equipment as follows:

CAUTION

The antenna base must be screwed down all the way until the antenna base meets with the connector. If a gap is left between the antenna base and the connector, the antenna base screw may break.

2-5

TM 11-5820-553-10

Figure 2-2. Radio Set AN/PRC- 70 Portable Configuration.

a. Install the antenna swivel base in RT unit

WHIP connector.

2-6

TM 11-5820-553-10

Assemble the whip antenna by unfolding either the 6-foot or the 9-foot section, and pressing ferrules together.

c. Screw whip antenna into the antenna swivel

base.

d. For voice operation, connect Handset H-250/U

to the AUDIO connector on the RT unit.

e. For CW operation, connect Headset H-251/U to the AUDIO connector and CW Key KY-116/U with cable CX- 13101/PRC-70 to the RXMT connector on the RT unit.

2-6. Fixed Configuration

This paragraph contains setup and assembly for operable equipment in fixed configurations. Nonportable equipment use is determined by the local

commander.

NOTE

When using the doublet antenna, the direction of the antenna wire should be at right angles to the desired direction of transmission.

Installation of Doublet Antenna. Figure 2-3

shows the equipment setup for this configuration. The halyard assemblies may be attached to any suitable structure, manmade or natural, that will provide maximum height, correct antenna length, and antenna orientation at a right angle to the direction of desired transmission.

2-7

TM 11-5820-553-10

Figure 2-3.

2-8

Figure 2-3.

TM 11-5820-553-10

(1) Select a good location for the installation of

the doublet antenna.

(2) Calculate antenna length of each leg by the

following formula:

234

Operating Frequency in MHz

NOTE

Total antenna length is the length of both antenna pieces added together.

EXAMPLE

Operating Frequency is 2 MHz,

117 (ft) each antenna leg. Total antenna length for 2 MHz = 2 x 117 ft or 234 ft.

NOTE

Due to corrosive effects of weather on the antenna wire the radio may not tune to this length. To compensate for this effect, the length of each leg of the

AS-2975/PRC-70 including bobbins, should be shortened by one foot below the

length calculated from the standard

formula 234 ft. (MHz).

(3) Remove Doublet Antenna Assembly

AS-2975/PRC-70 from accessory carrying bag (fig.

1-2).

(4) Connect the two wire rope assemblies to the

balun assembly as shown in figure 2-3.

(5) Unwind the desired antenna wire length as determined by (2) above on both wire rope assemblies.

(6) Unwind the nylon rope from the two halyard assemblies.

(7) Connect the end of the rope of the halyard assemblies to the reel of the two-wire rope assemblies.

(8) Secure the halyard assemblies to the

= (ft) of one leg

234

2 MHz

2-9

TM 11-5820-553-10

selected structures.

(9) Place the RT unit under the balun assembly near the RG-58 Cable Assembly.

(10) Place ground rod in the ground near the RT unit. Connect the ground wire to the GND terminal on the RT unit.

(11) Connect the RG-58 Cable Assembly to the

ANT connector on the RT unit. If necessary, use the extra 25-foot RG-58 Cable Assembly with Adapter UG-914/U.

b. Operation With Long Wire Antenna. The radio

set may be operated by using the two wire rope

assemblies and the two halyard assemblies of the

doublet antenna. The two guy hooks of the wire rope assembly are overlayed and bolted together. This will provide an antenna wire length of 234 feet. The

arrangement of equipment is shown in figure 2-4.

This long wire antenna arrangement can be used at

any operating frequency from 6 to 30 MHz.

2-10

Figure 2-4.

TM 11-5820-553-10

Figure 2-4.

2-11

TM 11-5820-553-10

c. Retransmit Configuration.

(1) Equipment setup. Two radio sets can be

operated together to establish retransmission of

voice signals on AM, FM, and SSB. Figure 2-5 shows

this configuration which includes the following items:

(a) Two Receiver-Transmitters RT-1133/

PRC-70.

(b) Two Batteries BB-542/U. (c) Transmission Cable Kit MK-456 or

MK-456A/GRC.

(d) One Doublet Antenna AS-2975/PRC-70. (e) One 6-foot or 9-foot Whip Antenna

AS-2974/PRC-70.

(f) Handset H-250/U.

2-12

Change 2

TM 11-5820-553-10

Figure 2-5. Retransmit Configuration.

2-13

TM 11-5820-553-10

(2) Assembly. Assemble the doublet antenna as described in paragraph 2-6. Perform the following steps:

(3) Operating Instructions.

(a) Set controls on RT unit as follows:

Control

POWER switch MODE switch VOLUME control SQUELCH switch FREQUENCY SELECTOR

switch

OFF Operating mode desired Midrange OFF To assigned operating

frequencies

Setting

(b) Initial tune up.

1. Turn RT unit

B POWER switch

to HI

PWR.

2. Set VOLUME control to a level

which

permits monitoring of any radio traffic on the specified frequencies.

If undesired traffic exists, turn squelch switch to RMXT and observe if the unit stays squelched. If the squelch breaks, even marginally, do not use that frequency. A good link check can be made at this point using the received

desired frequency to assure that it will break the squelch.

3. Perform the coupler tune sequence by momentarily setting the POWER switch to TUNE. This switch is spring loaded and will return to the HI PWR position.

4. Set the POWER switch to HI PWR or LO PWR as desired.

5. Tune unit C in a similar manner and set both units’ SQUELCH switch to RXMT position.

6. Connect RXMT Cable CX-4656/GRC.

7. Set RT units A and B to FM mode on the

specified VHF frequency.

8. Set RT units C and D to the SSB mode on the specified VHF frequency.

9. Communication link can be established by voice transmission from unit A to reception at

2-14

TM 11-5820-553-10

unit D. Proper relay operation can be determined by monitoring communications at CX-4656/GRC audio connector. To prevent a loss of message, the operator at the transmitting end should wait until his unit squelches (noise is muted) before responding to the received message. This will take approximately 2 seconds.

10. To shut down the equipment, set both

RT unit POWER switches to OFF.

2-7. Initial Adjustments

No adjustments of the radio set are necessary.

2-8. Operating Procedures

a. Equipment Starting. Start the equipment in

accordance with the following procedures:

WARNING

Serious injury or death could result to personnel if the whip antenna comes in contact with power lines.

(1) Set RT unit to desired frequency.

(2) Set RT unit POWER switch to RCV ONLY.

(3) Adjust RT unit VOLUME control for

suitable audio output level.

NOTE

The POWER switch is spring loaded in the TUNE position and will return to HI

PWR when released. When RT unit is in

the coupler tuning mode, radio silence is broken.

When the POWER switch is placed in the TUNE (momentary spring loaded)

coupler unit will

position, automatically tune to match the power amplifier to the antenna being used. If a

good match is made, the tune cycle will

stop and the RT will be ready for use. If a

the

2-15

TM 11-5820-553-10

good match cannot be made within 15 seconds, the coupler will stop the tune cycle. A no-tune condition will exist and is indicated by a series of 2000 Hz beeps when the RT is keyed. In SSB mode, the operator must talk into the handset to detect a no-tune condition.

(4) Momentarily set RT unit POWER switch to

TUNE and release. Allow 15 seconds for tuning to

be completed (when TUNE tone disappears from handset). Once coupler tuning is completed, the MODE switch can be changed without having to retune.

(5) A beeper (no-tune) tone will result if the

antenna coupler does not provide a proper match. Some power may be available and communication should be attempted even though the antenna is not optimum matched. Several corrective actions may be taken to improve the match and are listed below:

(a) Move POWER switch to RCV ONLY and try

tuning again.

(b) Change frequency and try tuning again. (c) Check antenna for damage. (d) Check doublet antenna for proper length. (e) Move to different location if near some large

object (tree, rock building, etc.).

(f) Check battery. Hold dial lamp switch on and

key transmitter. Dial lamps should not go out.

WARNING

When operating in HI PWR with the whip antenna, do not touch the antenna when in transmit mode—an RF burn can result.

A potential RF radiation hazard exists when Radio Set AN/PRC-70 is operated with the whip antenna, either 2 or 3 meters. This hazard is increased when the radio is operated in the portable (backpack) mode. For protection against these

2-16

Change 2

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

hazards,

observe

the

following

safeguards:

a. Use a dummy load when operating

the radio, if possible, such as when

performing

Preventive Maintenance

Cheeks and Services (PMCS) to determine

equipment readiness/availability.

b. Operate the radio in the off-the-back

(field-emplaced) mode, if possible, using either the doublet or the long-wire antenna.

c. If a whip antenna must be used for transmissions in the field-emplaced mode, use a microphone cable long enough to

maintain a distance of at least 50 centimeters from the antenna.

d. If the radio must be operated in the portable (on-the-back) mode, do not transmit for longer than 30 seconds out of any 6-minute interval.

(6) Set RT unit POWER switch to LO PWR. (7) Set RT unit SQUELCH switch to ON (if

desired).

NOTE

If RT unit FREQUENCY selectors are reset, momentarily set POWER switch to TUNE and release. After retuning is completed (within 15 seeonds), LO PWR position of POWER switch may be selected.

b. Voice Mode Operation. Transmit in any of the voice modes by pressing the H-250/U Handset push-to-talk button and speaking into the microphone.

c. Standard CW Operation. Use Headset H-251/U for CW operation. To transmit in the standard CW mode, key the RT unit with CW Key KY-116/U.

Change 2

2-17

TM 11-5820-553-10

WARNING

Serious injury or death could personnel if the whip antenna

result to comes in

contact with power lines.

d. Miscellaneous Operating Notes.

(1) Changing settings of RT

unit controls

should not be done while transmitter is keyed.

(2) To read FREQUENCY selector dials in poor

light, set SQUELCH switch to DIAL LIGHT. The

switch is spring-loaded in this position and will

return to ON when released.

(3) The radio set will not operate well with FM sets having 25-kHz channelization unless the RT unit has been modified for this mode. Such modification can be performed by depot support

maintenance personnel.

e. Equipment Shutdown. To shut down the

equipment set the RT unit POWER switch to OFF.

f. Special Tuning Procedures. Certain frequencies

and loading conditions may affect tuning. If several attempts at tuning fail, the operator should try the following steps:

(1) Change the location of the antenna. Objects near the antenna (including the operator, other people, and the handset cable) affect the impedance of the antenna. The operator can try to tune the radio set after doing one or more of the following:

(a) Change his position relative to the an-

tenna.

(b) Move the handset cable away from the

antenna.

to a tree, post, or some other conductor.

(2) Change frequency.

(a) Change the frequency of the radio set in

100 kHz steps to a frequency at which it will tune.

(b) Change frequency as in (2)(a) then, change

2-18

TM 11-5820-553-10

back to the desired frequency. This will often solve the problem.

g. Field Checkout. There may be times when the operator wants to know the operational condition of the unit without breaking radio silence. The following steps will provide a partial check and may lead to the corrective action required:

(1) With POWER switch OFF, attach battery. (2) Set FREQUENCY to 10.997 MHz, MODE

switch to SSB, and SQUELCH switch to OFF. Do

not connect any antenna to the radio.

(3) Turn POWER switch to RCV ONLY and adjust VOLUME control to obtain a suitable level of tone which should have a frequency of approximately 3000 Hz.

(4) Change the FREQUENCY to 10.998 MHz and observe that tone changes to a frequency of

approximately 2000 Hz. This test indicates that power supplies,

audio, and IF circuits, volume control, and handset or headset are operable. If no audio is heard, turn VOLUME control fully clockwise. If audio is still not heard, try a new handset and/or new battery.

(5) To check squelch operation, set

FREQUENCY to 10.898 MHz and turn SQUELCH switch to ON. The radio should mute (no audio or

noise unless strong traffic exists on that frequency). Set FREQUENCY to 10.998 MHz and observe that squelch breaks and 2000 Hz tone is heard.

(6) A battery check can be accomplished by

setting controls as given below:

(a) FREQUENCY at 10.998 MHz. (b) Turn SQUELCH switch to DIAL LIGHT

and observe light level. While holding switch in DIAL LIGHT position, change FREQUENCY to

14.998 MHz. The bandswitch motor will run and

lights should not dim (motor drains about 200 mA from battery).

2-19

TM 11-5820-553-10

(7) Transmitter (hot tune) check can be accomp-

lished into an antenna as given below.

NOTE

Radio silence will be broken.

(a) Set FREQUENCY to assigned frequency.

(b) Turn POWER switch to TUNE and note

presence of a tone in handset while coupler is tuning

(Radio silence is broken.)

than 15 seconds and that tone shuts off.

(d) Key transmitter and observe that voice

sidetone is heard.

(e)

If a series of beeps (a 2000 Hz tone coming

on at an interval of approximately 1 second) is heard,

try the following procedure:

Move POWER switch to RCV ONLY and try

tuning again.

Change frequency and try tuning again.

3. Check antenna for damage or doublet

antenna for correct length.

Move to a different location if near some

large object (tree, building, etc.).

Change battery if available.

2-20

Change 2

TM 11-5820-553-10

(8) Changing batteries.

(a) Battery removal.

1. Position RT-1133/PRC-70 (RT unit)

with battery assembly attached on a flat surface. Insure POWER switch on RT unit is in OFF position.

2. Unfasten battery side latches.

3. Lift RT unit away from battery.

(b) Battery installation.

1. Place a fully charged battery on a flat

surface with latches pulled out and down.

2. Ensure POWER switch on RT unit is in

OFF position. Place RT unit over battery and carefully mate battery connector with RT unit connector.

3. Press two units together and lock side

latches.

Section III. OPERATION UNDER

UNUSUAL CONDITIONS

2-9.

Operation Under Emergency Conditions

Operation Under Extreme Climatic Conditions.

AN/PRC-70 is designed to operate in a wide

The variety of climates. Some of the extreme climatic conditions that may be encountered are moist heat, dry heat, cold, rain, freezing rain, and snow. These conditions are discussed, and information for equipment operation and maintenance during their occurrence is provided in the following subparagraphs:

(1) Extreme moist heat. In warm damp climates or swampy regions, the equipment is subject to damage from moisture and fungus. Observe the

Change 2

2-21

TM 11-5820-553-10

following precautions:

(a) Check the equipment frequently for condensed moisture and fungus growth. Clean equipment surfaces using a mild detergent solution. Thoroughly wipe moisture from the exterior of the equipment with a lint-free cloth; remove fungus immediately.

(b) Warm damp climate promotes rust. Inspect facilities and equipment for signs of loose paint and corrosion. Refer to TM 11-5820-553-23 section I of chapter 2 for refinishing and repainting information.

(2) Extreme rainfall. During periods of extreme

rainfall, site facilities and equipment are subject to

damage from water seepage around weather seals.

Inspect weather seals on electrical equipment for

aging and resultant water seepage.

(3) Extreme dry heat. In hot, dry climates,

exposed electrical connectors, receptacles, and terminals are subject to damage from blown dirt and dust. Lubricants used on moving parts may become contaminated with sand and grit and accelerate parts wear by the resulting abrasive action.

Minimize the effects of extreme dry heat by ob-

serving that electrical connectors and receptacles have protective covers installed when not in use.

(4) Extreme cold. Subzero temperatures and climatic conditions associated with cold weather affect the operating efficiency of equipment. Extreme cold causes cables and wires to become hard, brittle, and difficult to handle. Ice formation can cause damage to facilities and equipment. Under certain conditions it may be advisable to discontinue terminal operations. The following precautionary measures apply:

(a) Be careful when handling power and signal

cables.

(b) Ensure that external connectors and

2-22

TM 11-5820-553-10

receptacles are kept free of frost, snow, and ice. Keep protective covers installed on unused electrical receptacles. protected cable connector in the snow.

(5) Freezing rain. A freezing rain condition,

commonly known as sleeting, can occur when the

ambient temperature drops to between +27°F and

+32°F(-2.8°C and 0°C) during precipitation conditions.

On these occasions, the ice levels on the antenna may accumulate to a level that can result in excessive loads being placed on the antenna drive mechanism. A

sleeting condition is apparent by an accumulative level of ice building up on exposed surfaces.

(6) Salt air and sea spray. Operation of AN/PRC-70 equipment in an area where salt air and sea spray are prevalant requires the following

preventive and protective maintenance procedures. With fresh water, wash down antenna and support equipment to prevent salt accumulation.

b. Operation on Low Batteries. Any or all of the following procedures may be used to save the batteries in RT unit in an emergency.

(1) Set POWER switch to LO PWR for trans-

mitting if good communications can be established

using this mode.

(2) If possible, use SSB voice or standard CW

mode.

(3) Use an external light source to check

frequency and controls.

Never drag or place an un-

2-10. Recognition and Identification

of Jamming

It is likely that under real or simulated tactical

conditions the receiver will be jammed by the enemy. Enemy jamming is done by transmitting a strong signal on the same frequency as that used for

Change 2

2-23

TM 11-5820-553-10

communication, thereby making it difficult or

impossible to receive the desired signal. Unusual noises or interference heard on the receiver may be

caused by enemy jamming, noise from a local source

or a bad receiver. To determine whether or not the

interference is in the receiver, disconnect and remove the antenna leads, and/or temporarily connect the WIRE post to the chassis. If the in-

terference continues, the receiver is bad. Enemy jamming signals may be a continuous wave or

modulated. A jamming signal may be intended to block a single frequency. This is called spot jam-

ming. The enemy may use one or several trans-

mitters to jam a block or band of frequencies. This method is called barrage jamming.

a. Continuous-Wave (CW) Jamming. CW jamming is transmitted as a steady carrier. This signal beats with another signal and produces a steady tone. CW jamming signals may also be keyed by using a random on-and-off signal or using actual code characters keyed to the same rate or a little faster than the signal being received.

b. Modulated Jamming. Modulated jamming

signals may be noise,

various tones, or almost any unusual sound, or it may be a number of these sounds. Various types of modulated jamming signals are explained below.

(1) Spark. This is one of the simplest, most

effective, and easily produced jamming signals. This

type of signal sounds very rough, raspy, and sometimes like an operating electric motor with sparking brushes. The signal is very broad; therefore, it will interfere with a larger number of communication channels.

(2) Sweep-through. This signal is the result of sweeping or moving a carrier back and forth at a slow or rapid rate, The numerous signals of varying amplitude and frequency produce a sound like that

laughter, singing, music,

2-24

Change 2

TM 11-5820-553-10

of a low-flying airplane passing overhead. This type of jamming is effective over a broad range or

frequencies. When it is varied rapidly, it is effective against all types of voice signals.

(3) Stepped tones or usually consists of several separate tones. The tones are transmitted in the order of first increasing and then decreasing pitch, repeated over and over. The audible effect is like the sound of a Scottish bagpipe.

(4) Noise. Noise is random both in amplitude

and frequency. It produces a sound similar to that

heard when a receiver is not tuned to a station and

the VOLUME control is turned to maximum.

(5) Gulls. This signal consists of a quick rise

and slow fall of a variable audio frequency. The sound is similar to the cry of the sea gull.

(6) Tone. This signal consists of a single audio

frequency of unvarying tone, It produces a steady howl. Another method of tone jamming.is to very it

slowly. This produces a howling sound of varying pitch.

2-11. Antijamming Procedures

When it is determined that the incoming signal is being jammed, notify your immediate supervisor and continue to operate the equipment. To provide maximum understanding of jammed signals, follow one or more of the procedures in the following steps.

If these procedures do not provide satisfactory

operation, change to an alternate frequency.

a. Operate RT unit as outlined in paragraph 2-8.

b. Tune FREQUENCY, using 100 Hz dial on

either side of received signal. This may separate the received signal and jamming signal.

Do not transmit on

frequencies.

c. Vary VOLUME control.

bagpipes. This signal

NOTE

unauthorized

This may reduce

2-25

TM 11-5820-553-10

jamming signals enough to permit weak signals to be heard.

d. Use either SSB or standard CW mode. These

modes are less affected by jamming.

Section IV. PREPARATION

FOR MOVEMENT

2-12. Portable Configuration Movement

The portable configuration of the radio set may be carried while assembled if continued use is needed. The whip antenna may be folded if the radio set will be transported in a vehicle. However, if the radio set will not be used right away at the new location, the equipment should be taken apart as follows:

a. Set POWER switch to OFF. b. Unscrew whip antenna from the antenna

swivel base.

c. Fold the whip antenna by pulling ferrules

apart. (Start with top section first.)

d. Unscrew the antenna swivel base from WHIP

terminal on RT unit.

e. For voice operation, remove Handset H-250/U

from the AUDIO connector on the RT unit.

f. For CW operation, remove Headset H-251/U from AUDIO connector and CW Key KY-116/U with cable CX-13101/PRC-70 from RXMT con-

nector on RT unit.

g. Put whip antenna, antenna swivel base, Handset H-250/U, Headset H-251/U, CW Key KY-116/U and all other loose items in accessory bag.

2-13. Fixed Configuration Movement

When the doublet antenna configuration is being used, proceed as follows:

2-26

Change 2

TM 11-5820-553-10

a. Set POWER switch to OFF.

b. Remove RF cable assembly from ANT con-

nector on RT unit.

c. Loosen and remove halyard assemblies from

supporting structures.

d. Remove halyard assembly from wire rope

assembly and rewind cord.

e. Disconnect wire rope assembly and terminals

from terminals on balun assembly.

f. Rewind antenna wire on reel of rope assembly

and secure.

g. Put all doublet antenna assembly items in

accessory carrying bag.

h. Remove ground wire from GND terminal on

RT unit.

i. Pull ground rod assembly out of the ground.

j. If Handset H-250/U was used, remove it from

AUDIO connector on RT unit.

k. If headset H-251/U was used, remove it from the AUDIO connector and disconnect CW Key KY-116/U from RXMT connector on RT unit.

l. Put all assemblies in accessory carrying bag.

2-14. Fixed Voice Configuration Movement

a. Set POWER switch to OFF.

b. Disassemble doublet antenna configuration as

described in paragraph 2-13.

c. Remove Handset H-250/U from voice security applique.

d. If applicable, remove security applique from X-MODE connector. Replace shorting cap on X-MODE connector.

2-15. CW or FSK Configuration Movement

To prepare the fixed CW or FSK configuration for movement, proceed as follows:

a. Set POWER switch to OFF.

b. Separate doublet antenna configuration as

2-27

TM 11-5820-553-10

described in paragraph 2-13.

c. Remove ground wire from RT unit GND

connector.

d. Remove KY-468/GRA-71(KE-8B) from

RXMT connector.

e. Put AS-2975/PRC-70, and other loose items in carrying bags.

2-16. Retransmit Configuration Movement

To prepare the retransmit configuration for movement, proceed a:

a. Set POWER switch on each RT unit to OFF.

b. Separate doublet antenna configurations as

described in paragraph 2-13.

c. Remove ground wires from GND connectors.

d. Remove MK-456/GRC from both RXMT

connectors.

e. Put AS-2975/PRC-70, and other loose items in carrying

bags.

Doublet Antenna Assembly

2-28

TM 11-5820-553-10

CHAPTER 3

MAINTENANCE INSTRUCTIONS

Section I. TOOLS AND EQUIPMENT

3-1. General

There are no tools or test equipment issued at this level of maintenance.

Section II. LUBRICATION

INSTRUCTIONS

3-2. General

No lubrication is required for the radio set.

Section III. PREVENTIVE MAINTENANCE

CHECKS AND SERVICES (PMCS)

3-3. General

Always keep the radio set ready for operation, It must be inspected routinely so that defects may be

discovered and corrected before serious damage or

failure results. The preventive maintenance checks

and services to be done are listed and described in table 3-1. The item numbers show the order of minimum discovered during operation of the unit will be noted

for correction when operation has ceased. Stop operation immediately if a failure is found during operation which would damage the equipment.

a. Before you Operate. Always keep in mind the

CAUTIONS and WARNINGS. Perform your before

(B) PMCS.

b. While you Operate. Always keep in mind the

CAUTIONS and WARNINGS. Perform your

inspection

requirements.

Defects

3-1

TM 11-5820-553-10

during (D) PMCS.

c. After you Operate. Be sure to perform your

after (A) PMCS.

d. If Your Equipment Fails to Operate. Refer to troubleshooting, Section IV. Report any deficiencies using the proper form, see TM 38-750.

3-4. Preventive Maintenance Checks and

Services (PMCS)

Refer to table 3-1. Checks and services are numbered in order. The item number column will be used as a source of item numbers for the TM Number column on DA Form 2404, Equipment Inspection and Maintenance Work Sheet, in recording results of PMCS.

3-5. Maintenance of the Radio Set

a. Cleaning.

(1) Remove dust and loose dirt from the surface

of equipment with a clean, soft cloth, item 1, appendix D.

WARNING

Adequate ventilation should be provided

while using

ROETHANE. Prolonged breathing of

vapor, should be avoided. The solvent

should not be used near heat or open flame; the products of decomposition are toxic and irritating. Since TRICHLORO-

TRIFLUOROETHANE

natural oils, prolonged contact with skin

should be avoided. When necessary, use

gloves which the solvent

penetrate. If the solvent is taken in-

ternally,

mediately.

(2) Remove grease, fungus, and ground-in dirt

with a cloth dampened (not wet) with TRI-

TRICHLOROTRIFLUO-

dissolves

cannot

consult a physician im-

3-2

TM 11-5820-553-10

CHLOROTRIFLUOROETHANE, pendix D.

(3) Clean control knobs, switches, and indicators with a cloth dampened with mild soap and water.

b. Inspection.

(1) Inspect interconnecting cables, doublet antenna, and cords for fraying, cuts, kinks and broken insulation.

(2) Inspect canvas items for mildew, torn and corroded, broken, or loose buckles and snaps.

(3) Inspect antennas for damage, loose fit, and corrosion.

(4) Inspect RT unit and battery assembly for damage, loose fitting latches, knobs, and switches, and corrosion.

Section IV. TROUBLESHOOTING

3-6. General

An equipment malfunction under field conditions

necessitates the operator to isolate the trouble to an

operator-replaceable unit and, if possible, return the unit to an operating condition. Perform field checkout procedures of paragraph 2–8g and refer to table 3-2 to determine failed operator-replaceable

unit. Any repair that is beyond the scope of the operator shall be referred to organizational main-

tenance.

item 2, ap-

Section V. MAINTENANCE OF

RADIO SET

3-7. General

There are no maintenance procedures which are the responsibility of the operator/crew as allocated by the maintenance allocation chart, except for visual

inspection.

3-3

TM 11-5820-553-10

Table 3-1. Operator/Crew Preventive Maintenance Checks

and Services (PMCS)

NOTE

If the equipment must be kept in continuous operation, check and service only

those items that can be checked and serviced without disturbing operation. Make the complete checks and services when the equipment can be shut down. Within the designated interval, these checks are to be performed in the order listed.

D–During Operation

C–Combat Ready

Procedure available if

Check that equipment manuals are available. Check that equipment is complete. Check that equipment clean. Check that painted surfaces are free of bare spots, rust, and corrosion. Check that connectors free of corrosion, foreign materials, and damage. Check that

canvas items are not worn or torn and buckles and snaps work good.

are

Item

no.

B–Before Operation

A–After Operation

Interval

BDAC inspected

Item to be

AN/PRC-70

Radio Set AN/PRC-70 Radio Set AN/PRC-70

RT Unit

Carrying Bags

For readiness

reporting,

equipment is

not ready/

3-4

TM 11-5820-553-10/EE150-SN-OPI/E110-PRC 70

Table 3-1. Operator/Crew Preventive Maintenance Checks and

Interval

Item

no. BDAC

Services (PMCS) — Continued

Item to be

inspected Procedure

RT Unit

Check that connectors

For readiness

reporting.

equipment is

not ready/

available if

not in use are securely covered.

RT Unit

Check that controls and switches are free

of corrosion, are not

loose or damaged, and operate smoothly.

Handset and Cables

Check that cables and cords are not worn,

cut, kinked, or have

broken insulation.

Antennas

Check that antennas are free of damage and can be properly installed.

RT Unit

Radio Set

AN/PRC-

Check that connectors in use are tight.

Check equipment for AN/PRC-70 proper operation fails to (para 2-8).

operate correctly.

NOTE

See DD 314 Preventative Maintenance Schedule and record to see if Frequency Stability Check is due.

RT Unit

Check that equipment

does not overheat.

RT Unit

Check that POWER switch is turned off.

Change 1

3-5

TM 11-5820-553-10

Table 3-2. Operator Troubleshooting

Malfunction

1. No Transmit or Receive.

Probable Cause

a. Antenna

Whip.

b. Antenna Doublet.

c. Handset.

d. RT-1133/

PRC-70.

e. Battery.

Corrective Action

(1) Make sure antenna is

fully screwed into whip

antenna

nector.

(2) Try both 6 ft. and 9 ft.

whip sections.

(3) Use doublet antenna.

(1) Check all connections

for proper fit.

(2) If coax is suspected,

substitute with extra 25 ft. coax section.

(3) Use long wire or whip

setup if necessary.

(1) Check connector for

proper fit.

(2) Replace handset with

headset and telegraph key if possible.

(3) Substitute with

another handset if available.

(1) Check all switch

positions for proper settings.

(2) Substitute another

RT-1133/PRC-70 if available.

(1) Make sure battery is

properly seated into rear connector of RT unit.

(2) Remove battery and

replace with good battery if available.

(3) Remove battery and

recharge using G-76/ G, Handcrank Generator or PP-6148/U,

Power Supply, Battery Charger if

con-

3-6

TM 11-5820-553-10

Table 3-2. Operator Troubleshooting–Continued

Malfunction

2. No Transmit/ a. Handset. Receive OK.

3. Transmit OK/ a. Handset. No Receive.

Probable Cause Corrective Action

b. RT-1133/ (1) Check

PRC-70.

c. Battery. (1) Remove battery and

available.

(4) Use

(1) Remove handset con-

(2) Replace handset with

(3) Substitute another

(2) Substitute another

(2) Remove battery and

(3) Use

(1) Remove handset con-

(2) Replace handset with

G-76/G or PP-6148/U as power source.

nector and clean connector and radio contacts with pencil eraser.

headset and telegraph key if possible.

handset if available.

POWER switch for proper setting.

RT-1133/PRC-70 if available.

replace with good battery if available.

recharge using G-76/G, Generator or PP-6148/U, Power Supply, Charger if available.

PP-6148/U as power source.

nector and clean connector and radio contacts eraser.

headset and telegraph key if possible.

RT unit

Handcrank

Battery

G-76/G or

with pencil

3-7

TM 11-5820-553-10

Table 3-2. Operator Troubleshooting– Continued

Malfunction

4. No Transmit or Receive in one or

more Modes.

5. No Transmit in HI PWR/LO PWR and Receive OK.

6. No Transmit in LO PWR/HI PWR and Receive OK.

Probable Cause

b. RT-1133/

PRC-70.

RT-1133/ PRC-70.

RT-1133/

PRC-70.

RT-1133/ PRC-70.

Corrective Action

(3) Substitute another

handset if available.

(1) Check all switch

positions for proper settings.

(2) Substitute another

RT-1133/PRC-70 if available.

(1) Try to communicate in

another operating mode.

(2) Substitute another

RT-1133/PRC-70 if available.

(1) Transmit in LO PWR

setting using whip or doublet or long wire antenna if possible.

(2) Substitute another

RT-1133/PRC-70 if available.

(1) Transmit in HI PWR

setting using doublet, long wire or whip an-

tenna if possible.

(2) Substitute another

RT-1133/PRC-70 if

available.

3-8

TM 11-5820-553-10

CHAPTER 4

MATERIEL USED IN

CONJUNCTION WITH

MAJOR ITEM

Section I. GENERAL

4-1. List of Auxiliary Equipment

a. Voice Security Equipment.

b. Code Burst Transmission Group AN/GRA-71

(Cable Assembly SM-C-746195).

c. Digital Message Device Group OA-8990/P. d. Handcrank Generator G-76/G. e. Power Supply Battery Charger PP-6148/U.

f. Battery BB-542/U.

Section II. INSTALLATION

INSTRUCTIONS FOR AUXILIARY

EQUIPMENT

4-2. Voice Security Equipment Configuration

a. Equipment Setup.

operated in secure or nonsecure voice modes from fixed locations. Figure 4-1 shows this configuration which includes the following items:

The radio set can be

4-1

TM 11-5820-553-10/EE150-SN-OPl-010/E1 10-PRC 70

Figure 4-1. Voice Security Equipment Configuration

(1) Receiver Transmitter RT-1133/PRC-70. (2) Handset H-250/U.

(3) Doublet

Antenna Assembly AS-2975/

PRC-70 or Whip Antenna AS-2974/PRC-70.

(4) Voice Security Applique (optional).

b. Assembly. Proceed as follows:

(1) Assemble whip antenna and connect to RT unit WHIP connector, or assemble doublet antenna on structures as directed in paragraph 2-6a.

(2) Remove shorting cap from X-MODE

connector on RT unit.

(3) Connect voice security applique to X-MODE connector.

(4) Connect Handset H-250/U to voice security

applique.

c. Operating Instructions.

4-2

TM 11-5820-553-10

(1) Preliminary Control Settings.

POWER switch

Control

MODE switch VOLUME control SQUELCH switch FREQUENCY selector

controls

OFF

AM or SSB Midrange OFF Operating frequency desired

Setting

(2) Start the equipment in accordance with the

following steps:

(a) Set RT unit POWER switch to RCV

ONLY.

(b) Adjust RT unit VOLUME control for

proper audio output level.

(d) Set RT unit POWER switch to HI PWR

or LO PWR, as required.

NOTE

The POWER switch is spring loaded in the TUNE position and will return to HI PWR when released.

(e) Set RT unit SQUELCH switch to ON (if

desired).

(f) Start voice security equipment as directed in applicable technical manuals.

WARNING

When operating in HI PWR with the whip or long wire wire antenna, DO NOT TOUCH the antenna when in transmit mode—an RF burn can result.

NOTE

If RT unit FREQUENCY selector controls are reset, momentarily set POWER switch to TUNE and release. The set should retune within 15 seconds.

Change 2

4-3

TM 11-5820-553-10

LO PWR position of POWER switch may be selected after this time.

(3) Transmit in any of the voice modes by pressing the H-250/U Handset push-to-talk button and speaking into the microphone. With voice security equipment connected, wait until the security tone is heard before speaking.

(4) To shut down the equipment, proceed as follows:

(a) Set RT unit POWER switch to OFF. (b) Shut down voice security equipment as

directed in applicable technical manuals.

4-3. Code Burst and CW Configuration

a. Equipment Setup.

operated in standard CW modes from fixed locations. Figure 4-2 shows this configuration which includes the following items:

The radio set can be

4-4

TM 11-5820-553-10

Figure 4-2. CW Configuration.

4-5

TM 11-5820-553-10

(1) Receiver-Transmitter RT-1133/PRC-70. (2) CW Key KY-116/U with cable

CX-13101/PRC-70.

(3) Headset H-251/U.

(4)

Code

Burst

Transmission Group

AN/GRA-71.

(5) Doublet Antenna AS-2975/PRC-70 or

Whip Antenna AS-2974/PRC-70.

b. Assembly. Proceed as follows:

(1) Assemble whip antenna and connect to RT unit WHIP connector, or assemble doublet antenna on structures as directed in paragraph 2–6a.

(2) Automatic mode.

(a) Connect in accordance with figure 4-2(A)

automatic setup.

(b) Prepare message as required in accordance

with instructions for Code Burst Transmission

Group AN/GRA-71.

(3) Manual Mode.

(a) Connect in accordance with figure 4-2(B)

manual setup.

(b) Connect CW Key KY-116/U with cable to

RXMT connector of RT unit.

connector of RT unit.

c. Operating Instructions.

(1) Preliminary settings.

(a) Set controls on RT unit as follows:

POWER switch

Control

MODE switch

VOLUME control

SQUELCH switch FREQUENCY selector

controls

(b) Set controls on

OFF CW or FSK Midrange OFF Operating frequency desired

all ancillary equipment to

Setting

preliminary settings listed in applicable technical manuals.

(2) Equipment starting. Start the equipment

4-6

TM 11-5820-553-10

using the following procedures:

(a) Set RT unit POWER switch to RCV

ONLY.

(b) Adjust RT unit VOLUME control for

proper audio output level.

WARNING

When operating in HI PWR with the whip or long wire antenna, DO NOT TOUCH the antenna when in transmit mode—an RF bum can result.

release. Allow 15 seconds for tuning to be com-

pleted.

NOTE

The POWER switch is spring loaded in the TUNE position and will return to HI PWR when released.

(d) Set RT unit POWER switch to HI PWR

LO PWR, as required.

(e) Set RT unit SQUELCH switch to ON (if

desired).

(3) Standard (manual mode) CW operation. To transmit in the standard CW mode, key the RT unit with CW Key KY-116/U.

NOTE

The RT unit remains in a keyed condition but produces no RF output during the pauses between characters. With the key open the RT unit returns to the receive mode after a pause of about 1.2 seconds.

(4) Burst CW Transmission. To transmit in the

burst CW mode, proceed as follows:

(a) Wind drive motor and load tape cartridge

in KY-468/GRA-7 (KE-8B).

(b) To transmit identity tone (optional), press

KY-468/GRA-71(KE-8B) IDY switch up and hold

Change 2

4-7

TM 11-5820-553-10

for at least five seconds.

set KY-468/GRA-71(KE-8B) motor ON-OFF

switch to ON.

(d) When transmission is complete, KY-468/GRA-71(KE-8B) ON-OFF switch to OFF.

(e) Remove tape cartridge KY-468/GRA-71(KE-8B).

O shut down the equipment, set RT unit

(5) T

POWER switch to OFF.

4-4. Digital Message Device Group OA-8990

Configuration

a. Equipment Setup.

The radio set can be operated with a DMDG unit from fixed or portable locations. Figure 4-3 shows this configuration which includes the following items:

set

from

Figure 4-3, Digital Message Device Group (DMDG),

OA-8990/P configuration

Receiver-Transmitter RT-1133/PRC-70.

(1)

Digital Message Device Group OA-8990/P.

(2)

4-8

TM 11-5820-553-10

(3) Doublet Antenna AS-2975/PRC-70 or

Whip Antenna AS-2974/PRC-70.

b. Assembly. Proceed as follows:

(1) Assemble whip antenna and connect to RT unit WHIP connector, or assemble doublet antenna on structures as directed in paragraph 2-6a.

(2) Connect OA-8990 DMDG, HF connector (A2J4) to RXMT connector of RT unit using Cable, CX-13156/GR.

c. Operating Instructions.

(1) Preliminary Settings.

(a) Set controls on RT unit as follows:

Control Setting

POWER switch OFF MODE switch SSB VOLUME control Midrange SQUELCH switch

FREQUENCY selector Operating frequency desired

controls

(b) Set controls on ancillary equipment to preliminary setting listed in applicable technical manuals.

(2) Equipment starting. Start the equipment

using the following procedures:

(a) Set RT unit POWER switch to RCV ONLY.

(b) Adjust RT unit VOLUME control for proper audio output level.

OFF

WARNING

When operating in HI PWR with the whip antenna, DO NOT TOUCH the antenna when in transmit mode—an RF

burn can result.

NOTE

The POWER switch is spring loaded in

Change 2

4-9

TM 11-5820-553-10

the TUNE position and will return to HI PWR when released.

(d) Set RT unit POWER switch to HI PWR

or LO PWR as desired.

(e) Set RT unit SQUELCH switch to ON (if

desired).

(3) DMDG Operation.

To transmit using the

DMDG, refer to procedures in TM 11-5820-887-10.

4-5. Handcrank Generator Configuration

a. Equipment Setup.

The radio set can be operated without batteries by using the G-76/G, Handcrank Generator as a power source. Figure 4-4 shows this configuration

which includes the

following items:

Figure 4-4. Handcrank Generator, G-76/G Configuration

(1) Receiver-Transmitter RT-1133/PRC-70.

(2) Handcrank Generator G-76/G. (3) Cable Assembly CX-13175/G. (4) Cable Assembly CX-13176/G.

b. Assembly.

(1) Setup G-76/G Handcrank Generator as

shown in TM 11-6115-470-10.

(2) Connect G-76/G to AN/PRC-70 using

CX-13175/G and CX-13176/G.

4-10

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

(3) Connect other ancillary equipment for

configuration previously described.

c. Operating Instruction.

CAUTION

Handcrank Generator G-76/G must

be producing power BEFORE the AN/PRC-70 is turned on. Failure to do this may damage the radio.

(1) Operate G-76/G in accordance with in-

structions in TM 11-6115-470-10.

(2) Use previously described operating in-

structions for RT unit, for the desired configuration.

d. Battery Charging Instructions. The G-76/G Handcrank Generator can be used to charge the BB-542/U Battery. Figure 4-5 shows this setup. This method of charging is only to be used when

standard battery charging procedures cannot be followed.

Change 1

4-11

TM 11-5820-553-10

Figure 4-5.

4-12

Figure 4-5.

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

(1) Temperatures above 50°F. Connect cable

from G-76/G to MS3112E-14-5S connector on side

of battery. Crank generator at a speed sufficient to

cause 2A indicator light on generator to turn on.

Continue cranking at 2A rate until load suddenly lowers due to opening of pressure switch within the

battery.

The 2A light on generator will be ex-

tinguished and will not turn on, no matter how fast the generator is cranked. Battery is now fully charged. The battery may also be charged in small increments to replace the energy removed by radio operation. Two minutes of cranking at 3 amperes will replace the energy taken out by approximately

1 minute of transmission or 20 minutes of receiving.

(2) Temperatures between 30 and 50°F. Connect cable from G-76/G to MS3112E-14-5S connector on side of battery. Crank generator at a speed

sufficient to cause 2A indicator light on generator to

turn on. Continue cranking until G-76/G 2A light

goes out and stays out irrespective of charging speed. This will indicate that the battery is fully charged. At temperatures between 30 and 50° F, the load on the generator may not change significantly when the pressure switch opens because the heater circuit will start drawing power after the battery is fully charged. The G-76/G does not provide any

indication of the current in the heater circuit. The battery may also be charged intermittently as directed above.

(3) Temperatures below 30°F. At temperatures

much below 30° F, intermittent charging is not recommended because a significant amount of cranking energy will be required to bring the bat-

tery to 30°F before high rate charging will start. The suggested procedure for minimum cranking time and effort is as follows:

(a) Start with a

battery that is almost

completely discharged.

Change 1

4-13

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

(b) Keep battery in heated area if possible.

such as a blanket, sleeping bag, coat, etc., to prevent

heat loss.

(d) Crank at highest sustained rate possible, use two men cranking to minimize exposure time and resulting heat loss.

For each 10°F that the battery is below 30°F 2 minutes of heating at 130 watts, or 3 minutes at

90 watts, will be required before high rate charging will start. Thus, with the battery at –20° F, approximately 10-15 minutes of heating will be required to bring it to 30° F where high rate charging can begin. When high rate charging starts, the current will be automatically switched by the G-76/G generator from the heater to the battery. At

this time the 2 ampere light will go on if the generator is being cranked at a fast enough rate. If the external temperature is low, the heater will

switch on for 2 to 3 minute periods every 5 to 10 minutes during the charge, extinguishing the 3 ampere light on the generator while still maintaining a load on the generator. Total charge time at

a 90 watt level will vary from about 45 minutes at

20° F to 65 minutes at –25° F. After the battery has

been completely charged, the heater load will still be maintained on the G-76/G generator until the battery temperature reaches approximately 50°F.

It is therefore difficult to determine when cranking

can be stopped; however, if cranking has continued continuously at 2 amps or above for the times given previously, and the 2 ampere light cannot be lit after about 3 minutes of additional cranking, then the battery is fully charged.

4-6. Power Supply Configuration

a. Equipment Setup.

operated without batteries by using the PP-6148/U

4-14

Change 1

The radio set can be

TM 11-5820-553-10

Power Supply. The PP-6148/U Power Supply requires external ac power. Figure 4–6 shows this configuration which includes the following items:

4-15

TM 11-5820-553-10

Figure 4-6.

4-16

Figure 4-6.

TM 11-5820-553-10

(1) Receiver-Transmitter RT-1133/PRC-70. (2) Power Supply PP-6148/U.

b. Assembly.

(1) Set PP-6148/U switches as required and in

accordance with operating instructions in TM

11-6130-356-15.

(2) Clamp RT unit onto PP-6148/U in the same

manner as the battery.

(3) Connect other ancillary equipment for

desired configuration.

c. Operating Instructions.

CAUTION

When using this configuration with the

RT-1133/PRC-70 in the HI PWR mode, use

doublet or long wire antenna only. Trans-

mitting in HI PWR mode with a whip antenna connected to the RT unit may affect the

voltage regulation of the PP-6148/U or other

power supply. This could cause an overvoltage condition and damage the PP-6148/U or the RT-1133/PRC-70.

(1) Use previously described operating in-

structions for RT unit for the desired configuration.

(2) Use operating instructions in the

PP-6148/U technical manual.

Change 2

4-17/(4-18 blank)

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

APPENDIX A

REFERENCES

DA Pam 310-1

DA Pam 738-750

SB 700-20

TB 43-0118

TB SIG 291

Consolidated Index of Army

Publications and Blank Forms.

The Army Maintenance Man-

agement System (TAMMS).

Army Adopted/ Other Items Sel-

ected for Authorization/ List of

Reportable Items.

Field Instructions for Painting

and Preserving Communications-Electronics Equipment.

Safety Measures to be Observed

When Installing and Using Whip Antennas, Field-Type

Masts, Towers and Antennas and Metal Poles that are used with Communications, Radar and Direction Finder Equipment.

TM 11-5820-887-10 Operator’s Manual, Digital

Device Group, OA-8990/P (NSN 5820-01-102-3921).

Change 2

A-1

TM 11-5820-553-10/EE150-SN-OPl-010/E110-PRC 70

TM 11-5835-224-12

Operator’s and Organizational

Maintenance Manual, CoderBurst Transmission Group, AN/GRA-71 (NSN 5820-00056-6860).

TM 11-5995-202-15

Operator’s,

Organizational, Direct Support, General Support,

and Depot Maintenance Manual for Transmission Cable Kits, MK456/GRC and MK-456A/GRC (NSN 5995-00-937-1544).

TM 11-6115-470-10

Operator’s Manual for Direct

Current Generator G-76/G (NSN 6115-01-082-8107), G-76/G(V)1 and (V)2.

TM 11-6130-356-12

Operator’s and Organizational

Maintenance Manual for Power Supply, PP-6148/U (NSN 6130-01-062-3618).

TM 11-6140-203-14-5 Operator’s, Organizational,

Direct Support and General

Support

Maintenance

Manual Battery BB-542/U.

TM 750-244-2

A-2

Change 2

Procedures for Destruction of

Electronics Materiel to Pre-

vent Enemy Use (Electronics

Command).

PIN: 050656-002

TM 11-5820-553-10

APPENDIX B

COMPONENTS OF END

ITEM LIST

Section I. INTRODUCTION

B-1. Scope

This appendix lists integral components of and basic issue items for the AN/PRC-70 to help you inventory items required for safe and efficient operation.

B-2. General

This Components of End Item List is divided into the following sections:

a. Section II. Integral Components of the End

Item. Not applicable. These items, when assembled,

comprise the AN/PRC-70 and must accompany it whenever it is transferred or turned in. The illustrations will help you identify these items.

b. Section III. Basic Issue Items. Not applicable.

B-3. Explanation of Columns

a. Illustration. This column is divided as follows:

(1) Figure number. Indicates the figure number

of the illustration on which the item is shown.

(2) Item number. The number used to identify

item called out in the illustration.

b. National Stock Number. Indicates the National stock number assigned to the item and which will be used for requisitioning.

B-1

TM 11-5820-553-10

c. Part Number. Indicates the primary number used by the manufacturer, 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. Following the part number, the Federal Supply Code for Manufacturers (FSCM) is shown in parentheses.

d. Description. Indicates the Federal item name and, if required, a minimum description to identify the item.

e. Location. The physical location of each item listed is given in this column. The lists are designed to inventory all items in one area of the major item before moving onto an adjacent area.

f. Usable on Code. Not applicable. “USABLE ON” codes are included to help you identify which component items are used on the different models.

Identification of the codes used in these lists are:

Code

Used on

g. Quantity Required (Qty Reqd). This column

lists the quantity of each item required for a complete major item.

h. Quantity. This column is left blank for use during an inventory. Under the Rcvd column, list the quantity you actually receive on your major item. The Date columns are for your use when you inventory the major item at a later date; such as for shipment to another site.

B-2

(Next printed page is B-3)

SECTION II

TM 11-5820-553-10

SECTION II

B-3

TM 11-5820-553-10

SECTION II

B-4

SECTION II

TM 11-5820-553-10

SECTION II

B-5

TM 11-5820-553-10

APPENDIX C

ADDITIONAL AUTHORIZATION

LIST

Section I. INTRODUCTION

C-1. Scope

This appendix lists additional items you are authorized for the support of the AN/PRC-70.

C-2. General

This list identifies items that do not have to accompany the AN/PRC-70 and that do not have to be turned in with it. These items are all authorized to you by CTA, MTOE, TDA, or JTA.

C-3. Explanation of Listing

National stock numbers, descriptions, and quantities are provided to help you identify and request the additional items you require to support this equipment. The items are listed in alphabetical

sequence by item name under the type document

(i.e., CTA, MTOE, TDA, or JTA) which authorizes

the item(s) to you.

(Next printed page is C-2)

C-1

Section II

TM 11-5820-553-10

SECTION II

C-2

TM 11-5820-553-10

APPENDIX D

EXPENDABLE SUPPLIES AND

MATERIALS LIST

Section I. INTRODUCTION

D-1. Scope

This appendix lists expendable supplies and materials you will neet to operate and maintain the AN/PRC-70. These items are authorized to you by CTA 50-970, Expendable Items (Except Medical, Class V, Repair Parts, and Heraldic Items).

D-2. Explanation of Columns

a. Column 1—Item number. This number is assigned to the entry in the listing and is referenced in the narrative instructions to identify the material (e.g., “Use cleaning compound, item 5, App. D”).

b. Column 2–Level. This column identifies the lowest level of maintenance that requires the listed item.

C–Operator/Crew O–Organizational Maintenance/Aviation Unit

Maintenance

F—Direct Support Maintenance/Aviation In-

termediate Maintenance

H–General Support Maintenance

c. Column 3—National Stock Number. This is the National stock number assigned to the item; use it to request or requisition the item.

d Column 4–Description. Indicates the Federal

D-1

TM 11-5820-553-10

item name and, if required, a description to identify

the item. The last line for each item indicates the Federal Supply Code for Manufacturer (FSCM) in parentheses followed by a part number.

d. Column 4–Description. Indicates the Federal item name and, if required, a description to identify the item. The last line for each item indicates the part number followed by the Federal Supply Code for Manufacturer (FSCM) in parentheses, if applicable.

e. Column 5— Unit of Measure (U/M). Indicates the measure used in performing the actual maintenance function. This measure is expressed by a two-character alphabetical abbreviation (e.g., ea, in, pr). If the unit of measure differs from the unit of issue, requisition the lowest unit of issue that will

satisfy your requirements.

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printed page is D-2)

D-1.1

TM 11-5820-553-10

SECTION II

D-2

TM 11-5820-553-10

By Order of the Secretary of the Army, the Navy, and the Air Force.

E. C. MEYER

General, United States Army

Chief of Staff

Official:

ROBERT M. JOYCE

Brigadier General, United States Army

The Adjutant General

H. D. ARNOLD

Rear Admiral, United States Navy

Commander, Naval Electronic

Systems Command

Distribution:

To be distributed

List.

in accordance with Special

Military Surplus rigs AN-PRC-70 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

WARNING

Chapter

CHAPTER 1

CHAPTER 2

CHAPTER 3

CHAPTER 4

APPENDIX A

APPENDIX B

APPENDIX C