Military AN/PRC-77 Portable VHF Transceiver

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The AN/PRC 77 entered service in 1968 during the Vietnam War as an upgrade to the earlier AN/PRC 25. It differs from its predecessor mainly in that its final power amplifier stage is solid state and not vacuum tubes. Today the AN/PRC-77 has largely been replaced by SINCGARS radios, but it is still capable of inter-operating with most VHF FM radios used by U.S. and Allied ground forces.

The AN/PRC 77 consists of the RT-841 transceiver and minor components. It can provide secure voice (X-mode) transmission with the TSEC/KY-57 voice encryption device, but is not compatible with the SINCGARS frequency hopping mode.

Items for the European defense forces were built in Germany by the Telemit Electronic GmbH company in München. Several improvements were made, including upgrading the standard 50 kHz channel spacing to 25 kHz.

Frequency range

RX-range
30-75.95 MHz in 2 bands
TX-range
30-75.95 MHz in 2 bands
HAM bands
-
Stability
-
Tuning steps
25 / 50 kHz (see description)
Filters
-

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Receiver

Modulations
FM  
Sensitivity
0.50 µV for S+N+D/N+D of 10 dB
Selectivity
-
Receiver system
-
IF-frequencies
-
Image rejection
-
Audio output
-

Transmitter

Modulations
FM  
RF-Output
1.3-4.0 W

Connections

Antenna
BNC + Proprietary (military)
Impedance
50Ω

Electrical

Power requirements
12.5 + 2.5V DC (BA-4386/U, BA-398/U or BA-55984 or a nickel-cadmium rechargeable battery cassette)
Current drain RX
-
TX
-

Physical

Dimensions (w×h×d)
273 × 100 × 273 mm (10.75 × 3.94 × 10.75 in)
Weight
6.20 kg (13.7 lbs)
Form factor
Portable
Manufactured
Between 1968 and 19xx in USA / Germany

Other features

Memories
920 channels in bank(s)
Usage
Military communication
Features + options
Range: 8 km (5 mi) depending on conditions
Accessories
-

Manuals, diagrams and brochures

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