AN/PRC-70

is a modern solid state radio. It is one of the first and few radios, covering as well HF as the tactical band.

The radio itself alone is called RT-1133/PRC-70.

It is developed as a portable radio, but can also be used as mobile set.

Modes are AM, CW, SSB, FSK and from 30 to 76 MHz also FM.

A fully automatic antenna tuner is built in. It tunes rod antennas, dipoles and long wires in an average of one second.

Two PRC-70, connected by a cable (MK-456 GRC), can operate as a relais or as crossband station.

Voice encryption is possible.

An operation below a voltage of 24 V can damage the radio, that is why the battery has a built in protection BB-542/U. (See picture gallery)

Frequency range:

2 ... 76 MHz

Frequency step:

100 Hz

Channels:

740.000

Modes:

AM, SSB, CW, FSK (2 .. 76 MHz)

FM (30 .. 76 MHz)

HF output:

CW, FM, FSK : 21 .. 42 W

SSB: 21 .. 42 W

AM: 7.5 W carrier; 30 W PEP @ 85 % modulation

Sensitivity:

AM 2.5µV; SSB/CW/FSK 0.375 - 0.5µV; FM 0.6µV

Bandwith:

SSB/FSK/CW 2.8 kHz, AM 6 kHz, FM 32 kHz

Voltage needed:

24 .. 32 V

Consumption:

Receiving: 7 W

Transmitting low output: 50 W

Transmitting high output: 160 W ( FSK, CW, FM, AM)

Transmitting high output: 115 W ( SSB)

Powered by:

Hand generator G-76/G with cable CX-13175/G

(PRC-70 itself needs cable CX-13176/G)

Power supply / charger PP-6148/U

Battery BB-542/U

Antennas:

Rod antenna short 6 feet; AS-2976/PRC-70 (for 4 ... 76 MHz)

Rod antenna long 9 feet; AS-2976/PRC-70 (for 3 ... 76 MHz)

Dipole antenna AS-2975/PRC (for 2 ... 30 MHz)

Range:

Antenna AS-2974/PRC-70: SSB/FM 40 km, AM 25 km

Antenna AS-2975/PRC-70: CW up to 4000 km; SSB, AM up to 800 km

Other:

Headset: H-251/U

Handset: H-250/U

CW key: KY-116/U

Year of issue:

1972

Built by:

Cincinnati

Replaced by:

PRC-74 and PRC-77

Replaced by:

PRC-138