"Bill" wrote in message
...
In message , Gordon Hudson
writes

You don't happen to know why Pye went back to seperate TX and RX with the
PF9?
The only alternative at the time was the PF70 which was rather large,

They could have made a valve set in the same case!

the PF8 which was also large

And very fragile. The basic chassis was solid as long as the overall
screening plate was fitted, but the plastic shell was rubbish. The first
time they sustained a minor drop the screws broke through the case and the
base cracked under the weight of the batteries. Nice radio electronically,
rather advanced for their time, crap case, crap internal aerial. No earphone
or mic socket and single channel as well.
They have quite a following amongst fans of 'The Professionals' TV series,
and a pair can fetch £200.
I know because I sold a pair on Ebay!

and then the PF85. There was no other small
radio. The idea of having separates was good where surveillance
concerned as they were easier to hide. The big problem with the PF9T was
the previously mentioned PSU. If you detuned the TX PA by putting
something conductive near the aerial i.e. your hand then you could hear
the inverter whistle!! Not very covert! There were also tails of dogs
reacting badly to it.

Presumably there must have been a demand for it from their customers, but
I
can't
see the advantage over a transceiver, which is why I thought they did
away
with
seperates after the PF1
PF1s looked pretty on a spectrum analyser though!!!!!!!!!!!!!!


Were they dirty?

Dave