UK Racal TRA-931 HF SSB Manpack Radio
The cylinder on the top is the antenna roller unit. The PC board is the frequency snthesizer unit.
|The lower right metal box is the USB and LSB crystalfilters.This is the Receiver PC board of the TRA931 radio.||Another angle view of the TRA931.||This is the high quality antenna roller unit. It uses gold plate wire for the inductance coil.|
The receiver board of the TRA931, left side small rectangle metal box is the front end filters, the top right hand side is the SSB filters
Please Click above photos for super size
This is the Racal TRA931 man pack radio. It is a ssb, cw and am transceiver with about 20 watt output.
Manufactured date around the mid 1970. Power supply is 24V but can be operated down to 12Vonly with low power output. 28000 synthesizer controlled channels are available within the frequency range and a search control provides continuously variable coverage between the 1 KHz channel spacing.
TRA931 is dustproof and
waterproof because of completely sealed. This together with conservatively rated
components, ensures extremely reliable performance under the most severe
Receiver sensitivity: 1 micro volt pd rf input will give 10 mv at output with s/n ratio>15db
Receiver selectivity: ssb, 6 db b/w 2 khz minimum, 40 db b/w 6 khz max.
am, 6 db b/w 10 khz typical, 55 db b/w 30 khz typical.
Power Output: 20 watt high, 5 watt low
Transmitter power consumption: 1.5A for ssb average speech
Antenna: 2.4m whip for operation above 2 Mhz, others long wire and dipole.
Power Supply: 24 volts 3.5 A ni-cab recharge battery MA934
Temperature Range: operating:-10 to +55 degree