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====== Royal Signal Corps P.C.R. ======
Manufactured by Pye Ltd Radio Works.

The P.C.R. communications receiver developed by Pye was primarily used for radio reception as a troop entertainment receiver. It was manufactured in various versions, of which only the first had an internal electrodynamic loudspeaker; the later models used a "Units Loudspeaker No. 2".

{{:images:mil-uk-pcr.jpg?600|Communications Receiver P.C.R.}}
===== Technical data =====
  * Principle]]: [[single conversion superhet]], [[IF]] 465 kHz
  * [[Operation modes]]: [[A3|AM (A3)]]
  * [[Frequency range]]: LW, MW, SW (5.8 - 18 MHz)
  * [[Frequency display]]: [[analogue dial]]
  * [[Frequency memory]]: none
  * [[Signal strength indicator]]: none
  * [[Signal processing]]: 
  * [[Features]]: Internal electrodynamic speaker in the PCR1, external speaker in the later variants.
  * [[Sensitivity]]: [[A3|AM (A3)]] / [[Selectivity]]: kHz (-6/-60 dB)

==== Power supply ====
  * [[Mains operation]]: 110, 220 V

==== Dimensions ====
  * 432 x 254 x 203 mm, weight 11.25 kg

==== Accessories ====
  * Units Loudspeaker No.2: external loudspeaker 

----
{{:images:mil-uk-pcr-front.jpg?600|Communications Receiver P.C.R.}}
===== Operation =====
The communications receiver P.C.R. was developed by Pye, the set has several components in common with the Wireless Set No.22, the cabinet with the dimensions 43.2 x 25.4 x 20.3 cm has the same size as the cabinet of the [[Wireless Set No.19]], the set weighs 11.25 kg. An external AC. POWER UNIT for mains operation was part of the system. In the first version P.C.R.1 with its built-in electrodynamic loudspeaker the power supply came with an exciter winding and without a mains choke. In the later variants, a power supply with built-in mains filter choke was used, alternatively for vehicle operation a VIBRATOR POWER UNIT with 12 V input.

The receiver was developed as a troop entertainment receiver for listening to radio messages from home in the distance, so it is not a typical military radio receiver, the P.C.R. was produced by Pye and Philips Lamps Ltd, England.

On the left of the front panel of the P.C.R. and P.C.R.1 models you find the electrodynamic loudspeaker mentioned above and below it the headphone sockets, the power switch and the indicator light. My set was later modified, in its original state, the set has a multi-pin connector for the supply voltages.

In the middle of the front panel below the horseshoe-shaped frequency dial, you find the tuning knob equipped with mechanical blocking, on the right is the band range selector and on the left a tone control, the volume control further to the left is labelled GAIN.

On the far right is a massive aerial and earth connector and an aerial trimmer.

Technically, the P.C.R. is a single conversion superhet with an [[IF]] of 465 kHz. The original P.C.R. / P.C.R.1 versions have a long wave range of 143 - 350 kHz, a medium wave range of 526 - 1578 kHz and a short wave range of 5.8 - 18 MHz. In the P.C.R.2 version (without built-in loudspeaker), the short wave range has been slightly changed to 6 - 22 MHz, while the P.C.R.3 version (also without built-in loudspeaker) does without the long wave and instead has two short wave ranges 2.3-7.3 and 7-23 MHz in addition to the medium wave, intended for use in the tropics.

===== Technical principle =====
After an RF amplifier stage (V1: ARP34/[[EF39]]), the signal is fed to the mixer (V6: ARTH2/[[ECH35]], valve used together with oscillator), after two IF amplifier stages (V2,V3: two ARP34/[[EF39]]) to a diode detector (V5: AR21/[[EBC33]], together with AVC and first AF stage) and then to the output stage (V4:VT52/[[EL32]], in the variants P.C.R 2/3 a [[6V6G]] is used). A [[6X5G]] is used as a rectifier in the external power supply unit.

In the course of the post-war years, most of the surviving receivers underwent modifications.

My set has been modified, all the components of the original external power supply habe been installed in the cabinet; so the interior and also the frontpanel have a different look.

==== Components ====
V1 ([[EF39]]); V6 ([[ECH35]]); V2, V3 (two [[EF39]]); V5 ([[EBC33]]); V4 ([[EL32]])

===== Technical documentation =====

==== Development ====
{{gallery>:images?mil-uk-pcr*.jpg&0&80x80&lightbox&showtitle&titlesort}}
==== Further information ====
  * [[https://www.radiomuseum.org/r/pye_pcrpc.html|Communications Receiver P.C.R. on the website of www.radiomuseum.org]]