Ian
I am not sure if the Racal branded sets behave the same way as the Clansman ones with regard to PTT (My Racal experience is RT350 and R351/2). If so beware that the G8TXJ design has a 1.5K potentiometer on the radio side of the microphone transformer, and Clansman sets are keyed by a 1.6K impedance between microphone and mic ground - some also support PTT to ground and the Clansman headsets have a DPST PTT which makes both connections.
Provided the station you are working is near the middle of the audio band in the PSK31 waterfall display - say 1 to 1.5KHz - I think more or less any SSB set should work well - the issue will filtering if there is one will be if you don't tune the radio to center the wanted station and instead try to work stations near the edge of the waterfall. I am planning to try PSK on my RT320 soon so will find out if that's a good theory !
If this is the case for the PRM4051 you will need to add a capacitor or wire the relay to disconnect the Mic circuit when the radio is not keyed if you use the G8TXJ circuit as printed,
Regards
Iain
73 de G0OZS
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On Sep 6 2010, radioshedtw wrote:
Having read the excellent article in this month's Radcom from G8TXJ regarding the VOX operated PSK31 interface I am wondering if it would be compatable with my PRM-4051.
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