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Are there any specs on what this jack does and how it keys an amplifier? ?I want to key my xpa125b with it without damaging anything!

I measure .23 vdc from tip to sleeve when transmitting. ?If I measure resistance I get 75k ohms. ?Can anyone test their own rig to see if they get the same? ?I was hoping that tip to sleeve would be a dead shirt to ground to key my amplifier through a buffer relay. ?Thanks for your help.

You will not damage anything but it simply won't work. The XPA125B needs to sense less than 0.1V to switch to Tx and it seems the darlington mount on the Q900 side cannot get that low when turned on. One would need an intermediate relay which is a pain.

I always put a micro relay on the back panel to isolate the solid state switching. Saved a lot of radios!
Dave

Hi Bob. The radio provides a dry solid state active level low. What I do is put a micro relay on the back panel and an RCA plug like most radios. I never trust the solid state keying circuit. ?Real easy to wreck the key circuit. I drive an amp with mine and works fine. I can send pic of one I've done if that would help. Does yours TX on SSB? That's my issue. It is very distorted like the audio is slamming the balanced modulator to hard.
73
Dave