"Bill" wrote in message
...
In message , Nigel M
writes
I've got two pairs of Pye Pocketfone 9 Series Transmitters & Receivers.
I want to put them on eBay, but I don't really know much about them.

They used to be used for studio talkback in a Commercial TV Studio in SE
London,
ITN used to use them as talkback many years ago.

but were replaced in a recent refurbishment. For security
purposes, the crystals have been unplugged, but I have managed to
acquire eight of them. The crystals are all colour coded green (as are
the 9Rs) and have values 470.1 470.2 and 470.4 - presumably MHz.

Please note that if by "crystals" you mean the plug in cube at the bottom
then this is more than just the crystal. The crystal is inside this unit,
without the plug in they are not much use. One BIG word of advice is if
you have the TX apart do NOT touch the PCB while it is powered up as this
can cause the PSU inverter to go over volt and blow all sorts of
interesting things!

I'd almost forgotten about PF9s, I used to make them many years ago.



Can anyone give me any more info? Are these of use to radio amateurs?

If you want short range simplex or live near a repeater they are great,
one advantage is that the RX had an RF sensor that would detect the TX and
mute the RX to stop feed back. There is also an earpiece socket on the
top, if you look closely two of the speaker holes are slightly different
and these take a two pin plug, as used on many pro' earpieces.
--
Bill


You don't happen to know why Pye went back to seperate TX and RX with the
PF9?
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

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.