Description
The AN/PRC-77 was built to be repaired.
This is TM 11-5820-667-35, the Department of the Army direct support, general support, and depot maintenance manual for Radio Set AN/PRC-77.
Originally issued in February 1968, this copy is a reprint incorporating updated pages from Changes 1 through 3.
This is not the little operator booklet telling somebody which knob to turn. This is the manual for the people who had to figure out why the radio quit working.
Inside the manual
- AN/PRC-77 circuit operation and signal-path analysis
- Receiver circuit analysis
- Transmitter circuit analysis
- Frequency synthesizer system analysis
- Power distribution circuits
- Direct-support troubleshooting
- Module-level repair procedures
- Alignment procedures
- Receiver and transmitter testing
- General-support maintenance
- Depot maintenance procedures
- Voltage and resistance measurements
- Depot overhaul standards
- Block diagrams
- Exploded mechanical views
- Test setups and fabrication diagrams
- Detailed electronic schematics
The technical material gets deep quickly. The manual documents the RF amplifiers, mixers, audio stages, transmitter power amplifier, antenna network, frequency-control system, oscillators, filters, phase comparator, voltage regulator and the rest of the circuitry inside the RT-841/PRC-77.
The radio covers 30.00 through 75.95 MHz in 50 kHz increments for a total of 920 channels. The manual follows those systems down into individual modules and components.
There are actual schematics here. Lots of them.
If you own an AN/PRC-77, restore military communications equipment, collect vintage electronics, or simply enjoy staring into the electrical guts of machinery designed when field repair still meant field repair, this is the useful manual.
Download
Format: PDF
Document: TM 11-5820-667-35
Title: Direct Support, General Support, and Depot Maintenance Manual — Radio Set AN/PRC-77
Original publication: February 1968
Scan length: 258 PDF pages
Updates included: Changes 1 through 3
Old military electronics documentation gets wonderfully unreasonable around the point where a normal owner’s manual would have stopped 200 pages ago.
