I'm still mid-build on the QMX.? I have the same symptom showing up - being a short circuit between the center of the BNC and the ground / outer shell.? Just checked it by accident, and drew some instant emotion!? I examined the center pin under the BNC fitting, and it goes through the PCB cleanly, so no chance of a solder bridge.? The Solder connection on the back is beautiful and clean.

Since I cant see inside the multi-layer PCB, it holds many mysteries.? 2 other (perhaps related) anomalies that arose were:

1) when I connected the Trifilar winding, all AA BB CC continuity checks were perfect, and solder joints were clean.? BUT, I not only got continuity between AA BB and CC, but all 6 connections showed reciprocal continuity.? Is this normal?!

2) Similarly, when I wound the T507 Binolcular, AA BB CC and DD all checked out prior to install, but after soldering (also cleanly) all 8 terminals showed mutual continuity -? one-and-all!

Can I proceed with 2.16 - Install Pin Header Connectors, or do I have to Down-Tools until the mystery is solved?

Does this point to a DEEP problem somewhere, or should I just proceed, and "it all comes clean in the wash"?? ?Does the SDR magic make sense of it all??

?Kevin Woods,
VE7KHI - BC