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,
the PF8 which was also large 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!!!!!!!!!!!!!!


One of the good things about the PF9 is you can run them on ordinary AA
batteries.
You don't need to find or rebuild nivads and chargers.



--
Bill