@DL2ARL
Thanks for pointing this out. Seems I have been lucky so far...and if I think about it, its probably by chance. Routinely, I connect my trigger board first to the powerbank and then I connect the transceiver. By this time, voltage negotiation seems done and the QMX does not see the 5 V to 12 V step anymore. Unfortuantely, I can't edit my initial thread to highlight that this sequence may be important to not kill anything.
So for everyone who is still reading: If you plan to use USB-PD to power your QMX, first connect the trigger board to the powerbank, wait some seconds until voltage negotiation is done, then connect the QMX.
@N6HAN
Correct, it's a BNC connector for RG58. It's drilled open (a little) to match it with the 6 mm brass tube + heat shrink (to isolate the whip from ground). That's basically the base of the antenna. In the meantime, I played around with the coil "design". Because it worked so well on 30m, I wanted to have the option to switch coils and operate on 20m, 30m as well as 40m. Below a picture with some comments.
I did another short SOTA activation with the QMX this morning on 20m, and again it worked amazingly well. 12 QSOs in 15 minutes. And with the new firmware 017 I did not experience any glitches at all. Smooth CW operation. Thumbs up, Hans! For sure many more QMX SOTA activations will follow.
Best,
Matt
