Edit: fixing my mistake...
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Apologies for necroing this post, but it didn't feel confirmed. So wanted to make the instructions clearer and add in the 100W amp to make it easier for people to find in a search.
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Just breadboarded this with my Elecraft KXPA100 amp and it works as expected.?
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QCX-mini PTT PTT/ring -> BS170 gate
QCX-mini PTT ground/sleeve ->? BS170 source
BS170 drain -> KXPA100 RCA positive
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Thanks,
Andre, WT9X
Andre - WT9X