[Premium-Rx] Plessey PR2250 Hf Receiver

[Chris Quayle]

Gentlemen,

Have couple of Racal receivers in a collection, as well as a
PR155 series, which started a Plessey receiver interest.

Also have a PR2250 HF receiver, 1980's vintage, and writing a
software package for remote control via the serial / control
port on the back panel. Can’t get any response from the port,
nor the expected voltage level on the serial out line. Have
the service manual, which includes the protocol definition,
and initially using an old protocol analyser to send test
protocol  frames. The modules are all enclosed, so, unable to
get a scope on the cpu board at present.

Starting to think it may be a hardware fault, as the rx has
had intermittent glitches due to a previous owner storing
in an unheated garage for years. More or less reliable now
though.

Looking for any parts, modules, or even a complete receiver,
dead or alive, to allow module swapping and debugging.  Need
to build an extender board set as well, though these were
original available from Plessey.

In Oxford, UK.

Thanks, Chris