On Sat, 26 Nov 2005 14:22:13 -0000, "Dave D"
wrote:


"Seafarer" wrote in message
...

In my days,not sure about now,you could attach a reciever plugged into
your scope and when a command was triggered up came the wave form on
the scope with the frequency easily workrd out.
I thought there maybe something along those lines where I could see
both waveforms and adjust from inside one.Thanks again.Frank


Two thoughts here. Firstly, you appear to ber confusing the carrier
frequency of the transmitter with the clock frequency of the data, but
they're two entirely different things.

Secondly, a scope is not much use in determining the spot frequency of a
transmitter - that is what your frequency counter is for. The devices in
question possibly operate in the UHF band, so your frequency counter will
need to operate up to the frequency of the transmitter, or you'll need a
prescaler suitable for the job.

All you need to do is inject the transmitter output into the counter,
preferably not by direct coupling as it may damage the counter depending on
the transmit power, and it should display the frequency. You could try a
length of wire in the of the counter's input socket, and operate the
transmitter and see what happens.

Your best bet IMO is to simply transfer the RF section from the spare cart
to the good one should you lose the remote. The frequency is likely set by
crystals and replacements would have to be specially cut, and to do this the
crystal manufacturers would need info on the circuit design. It's very
unlikely to be a case of simply tweaking the device on frequency, crystal or
pll control of transmitters has been standard for a long time now. The
reciever might be a different matter, but as you have a spare RF section I
don't see it's worthwhile fiddling around.

Dave


Thanks for the info,it seems the way to go is as you say,then again if
I swap units I'll still end up with one handset but at least Iknow
what to look for.Many thanks.