Bojan, Roy, and Chris - thanks for the replies and tips on how to test that the PTT is in fact working. And surely enough, IT IS!! I metered between Tip and Ring and also between Ring and shield - 4.93 volts when I press the key. Most certainly not what most folks would have expected! But, now that I know PTT does function I'll feel safe connecting my SDR++ to the QMX through my MFJ-1708B-SDR box. Now I just need to get CAT-relay working so the QMX and SDR++ talk to each other!
?72/73 & many thanks guys.
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Jim / K7TXA
Eagle, ID
SKCC 10447T
BUG 301
