Communication.

VINTAGE AVIONICS

PTR 175

PTR-175 transceiver, DC-only version

Photo  E-bay

Plessey PTR 175 VHF/UHF transceiver

The  British PTR-175  made by PYE  is an extension of  the ARC-52.  A VHF transceiver was added, and the channel spacing is 50kHz, both in VHF and UHF.

The inside and outside look the same as the ARC52 ; the plug, cables and control panel are identical. The “hundreds MHz” digit on the C 1607/4 control panel can be set to 1, 2 or 3, rather than only 2 or 3. On the inside, the relay module got more relays and three VHF local oscillators, and the RF preamplifier module got a complete VHF mixer and final amplifier, see this picture.

Versions

Like the ARC52, the PTR175 was available in a DC-only version with dynamotor, and in an ac version  (PTR175A) with 3-phase 400Hz supply.

Support is available for the automatic direction finder ARA25, and for a variety of microphones. Even a limited intercom function can be configured. The  guard receiver module can be replaced by an fsk demodulator for data transmission which changes the unit name to PTR177.

Frequency range

UHF  3500 channels with 50kHz spacing from 225.00 to 399.95 MHz, AM., 20W RF output.

VHF  370 channels with 50kHz spacing  from 117.50 to 135.95MHz , AM,  3W RF output There are separate connectors for the VHF and UHF antennae.

 

The unit has 46 tubes and a few transistors in the VHF mixer and  IF  stage.

 

Diagrams can be found here

 

HOME

 

FM Communication

 

   ARC-44

   ARC-54

   ARC-131

  CPRC-26

FM Comm panels

 

VHF Communication

  ARC-73

  TR 1985

 

 

UHF Communication

 

  ARC-27 

  ARC-34

  ARC-45

  ARC-51

  PRC-41

  ARC-52 Family

  ARC-552

  UHF Comm panels

 ARM47 UHF testset

 

  USB control

 

Download Pictures

 

Download Diagrams

1964