Chapter 1. GENERAL INFORMATION - TM-11-5820-919-120021

TM 11-5820-919-12

CHAPTER 1

GENERAL INFORMATION

SECTION I

GENERAL INFORMATION

4. Repair Parts and Special Tools List TM 11-5820-

1-1. SCOPE OF THE TECHNICAL MANUAL.

919-24P. Contains complete parts ordering data

for all levels of radio set maintenance.

1-2. This technical manual provides operator's and

organizational maintenance information covering Radio

1-4. Chapter 1 of this technical manual provides general

Set AN/PRC-104 (radio set). The information includes

reference data and information on the physical aspects

operating instructions, installation and setup, theory of

and technical characteristics of the radio set. It also

operation and maintenance data. Additionally, the

covers setup, initial checkout, and demolition to prevent

propagation of radio waves in the high frequency (hf)

enemy use. Chapter 2 contains operating instructions,

radio spectrum is discussed relative to optimizing

and also discusses various operating environments for

communications with this radio set. Complete coverage

optimizing communication. Chapter 3 provides system

for Battery Case CY-7875/ PRC-104 (battery pack) is

and functional theory of operation. Chapter 4 contains

provided in this manual, because the battery pack is

maintenance

instructions

including

preventive

maintained entirely at the organizational level.

maintenance, troubleshooting, and repair down to

replacement of units and accessories. Appendix I, at the

1-3. Complete coverage of the radio set, including

back of this manual, contains a list of abbreviations used.

Receiver-Transmitter RT-1209/URC (receiver/ exciter)

Appendix II1 provides a discussion of hf radio wave

and Radio Frequency Amplifier AN1-6874/ PRC-104

propagation and gives Situational examples for

(amplifier/coupler), for field and depot levels of

optimizing communications.

Appendix III provides

maintenance is provided in the following manuals:

instructions for use of the dipole antenna kit.

1. General Support Maintenance Manual TM 11-

1-5. EQUIPMENT DESCRIPTION.

5820-919-40-1. Contains reference data, theory

of operation and disassembly and reassembly

1-6. INTRODUCTION. The AN/PRC-104 is a state-of-

for the complete radio set. It also provides test

troubleshooting, alignment and repair data for

the-art lightweight radio transceiver that operates in the

the radio set and the receiver/exciter and

high frequency (hf) and upper part of the low frequency

amplifier/coupler units necessary to replace unit

(If) portions of the radio spectrum.

components and modules.

The receiver/transmitter circuits can be tuned to any

2. General Support Maintenance Manual TM 11-

frequency between 2.0000 and 29.9999 MHz in 100 Hz

5820-919-40-2. Contains maintenance prints for

increments, making it possible to tune up to 280,000

the radio set, units and modules.

separate frequencies. The radio set operates in the

upper sideband (USB) or lower sideband (LSB) modes

Maintenance prints include all schematics;

for voice communications, CW for Morse code, or

power distribution; component location; test and

frequency shift keying (FSK) for transmission of teletype

alignment setup; performance test and

or other data. In the man-pack configuration the radio

alignment

required

for

complete

field

set is designed to be carried and operated by one man

maintenance of the radio set.

or, with the proper accessories, can be configured for

vehicular or fixed station use.

3. Rebuild Standards RS-07748A-50/4. Contains

depot-unique repair and rebuild data for the radio

set that is not covered in the field maintenance

manuals.

1-1