INTRODUCTION - TM-11-5820-919-40-20009

TM 11-5820-919-40-2

INTRODUCTION

This technical manual provides maintenance prints for Radio Set ANtPRC-104 (radio set). It is used in conjunction with the general instructions, maintenance information, and theory contained with the general instructions, maintenance information, and theory

contained in TM 11-5820-919-40-1. For parts ordering information refer to TM 11-5820-919-24P

Maintenance prints are provided for the radio set; the receiver/exciter unit and its 5 modules; and the amplifier/coupler unit and its 2 modules. The maintenance prints radio set and the two units are the same as those contained in TM 11-5820-919-40-lo The

maintenance prints include schematics, power distribution; component location; test and alignment setup; performance test; and alignment procedures.

Schematic diagrams contain pertinent voltage and waveform reference data to assist in fault isolation and are used an conjunction with the performance test flowcharts.

Component location diagrams locate and list every replaceable component, and identify the location of test points and pins required to monitor voltages and waveforms on performance test flowcharts.

Test and alignment setup diagrams provide a list of test equipment, a list of special tools and materials, fabricated cables and fixtures, and initial connections for the test setup, They are used in conjunction with the performance test flowcharts. Module

performance tests may be performed more easily if the module is tested while inside the radio set, rather than extended via cables. Once a fault is indicated, the module should be removed from the radio set and connected via appropriate extender cables.

Performance test flowcharts provide performance test (heavy flow line) and troubleshoot mug procedures (light flow line) for fault isolating to a component or group of components. The flowcharts are supported by the reference information provided in the

other diagrams.

Alignment procedures are used in conjunction with the performance test flowcharts.

NOTE

Poor electrical connection due to dirty or bent connector plus may often be the cause of equipment malfunction or faulty test indication. All electrical connections should be double-checked before proceeding with test or fault isolation.

TECHNICAL CHARACTERISTICS

Characterlstlc

Description

Characteristic

Description

Characteristic

Description

RADIO SET AN/PRC-104 (Radio Set)

Power Requirements

20.0 to 32.0 vdc with input at 3.5 amp

Audio Distortion

5 percent at 5 mw, 350 to 3000 Hz

2.5% to -29 dbm;

Frequency Range

2.0000 to 29.9999 MHz in. 0.0001 MHz

(24 vdc) for transmit (typical). 200 ma

Desensitization (signal to

(100 Hz) increments (280,000 possible

for receive (typical).

10% to -15 dbm;

degrade SINAD 3 db)

frequency settings)

Operating Temperature Range

-51 (-46 ) to +160 (+71 )

50% to +17 dbm

1 ppm for -51 (-46 ) to +160 (+71 )

Environmental

Meets applicable provisions of MIL-

Frequency Accuracy

TRANSMITTER

STD-810B

(2 to 30 Hz of setting) from 2 to 30 MHz

RF Output Power

0.3 W (PEP) for RT-1209, 20W (PEP or

Mean Time Between Failure (MTBF) 2500 hours (demonstrated per MIL-

respectively.

average) with AM-6874

STD-785)

Operating Modes

- Slngle sideband (selectable USB or LSB)

Intermodulation Distortion (IMD)

-25 db (two equal tones at rated output

Mean Time to Repair (MTTR)

15 minutes (module replacement)

- Voice/cw (Morse or burst cw at 300 wpm)

power

Dimensions

12 1/2 x 10 1/2 x 2 5/8 (31.75 cm x

- Data (FSK or DPSK up to 2400 bps) compatible

Harmonic Radiation

-50 db

26.67 cm x 6.66 cm) D x U x H

with 75 baud military teletype

Carrier Suppression

-42 db

Weight

14 pounds (6.36 Kg), including 4.8 AN

- Receive only (inhibits transmit operation)

Unwanted Sideband Suppression

-45 db

silver zinc battery (without

Audio Input Impedance

150 ohms, -56 dbm (voice) or, 6 mv. RMS.

All Other Spurious

-45 to -60 db

accessories)

and Level

600 ohms, 0 dbm (data) or, 77 v. RMS,

Duty Cycle

1 minute continuous keydown, 9:1

RECEIVER

RP Output Power

20w (PEP), 0.25w (PEP) exciter output

transmit/receive ratio

Sensitivity

RF Output Impedance

50-ohms, unbalanced. Output protected to

BATTERY PACK

SSB, Cal, FSK

0.7 v for 10 db SINAD (-110 dbm

infinite VSWR due to antenna short or open.

Battery

Silver-zinc (AgZn), rechargeable 4.8 AH

voice, -70 dbm data)

Antenna Tuning

Automatic to 1.5:1 VSWR (3 seconds

Selectivity

2.5 kHz Bandwidth at -3 db

tuning time, typical)

SSB, CW, FSR

6.0 kHz Bandwidth at -60 db

Image Rejection

70 db

I.F. Rejection

60 db

Audio Output

25 tow into 500 (nominal)