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It appears that the current firmware does not control the PTT so I cannot use my QRP labs 50W amplifiers (at lower wattage for continuous operation).? Will PTT control be in the next firmware?

Can someone pls. inform on whether ptt for the amp. has been sorted for the current firmware?? We're at rev. 14 and I can't see anything discussing it's implementation.

Cheers in advance Hans,

Damion.
VK3DPH.

Thanks Hans, greatly appreciated.

FYI: having excellent results generally. Very good sensitivity and selectivity. I'm running firmware .010 (not tried .014 yet). Qn. - Will firmware .014 work seamlessly with PCB rev. 1? I note firmware .011 line 3c states:

"20/80m BPF TXswap - swaps 20m BPF and 80m BPF on transmit (see Rev 2 PCB issue)"

Looks like firmware .011 and on are for PCB rev.2...

Best regards for the festive season,

Damion.

--
Sent from my Android phone with Mail. Please excuse my brevity.

I've complete QMX build on rev 1 PCB. Loaded firmware 014 and worked 20 connections on FT8 this morning, all good.

Went to testing PTT but cannot get QMX to change PTT level, its constantly at 5v on middle pin of the jack.

Look forward to next release :-)

Regards
Per

Update:

The 5v is meassured with a DVM, if I add a load like a 1K resistor the voltage at the middle pin drops to 0v.
This is properbly due to a high impedance internal pull up or similar.

Many amplifies use relays to enable transmit.
Measuring source or sink current is more realistic.

Per,

I have exactly the same problem with my Rev 1 QMX build running firmware 014. I had good results running barefoot on Ft8 and thought I would try hooking up my QRP Labs 50W amp. Much to my surprise, I have a constant 5V on the ring of the PTT in receive or transmit. I too hope the next firmware release will fix this.

73,

Pete, KH6GK

One more for the pile:

I have both QMX 80-20M and 20-10M versions, both are working like champs, excellent DX all around, running 014 firmware.?

But PTT isn't working at all on either version of the QMX, both on the "TX PTT +5V? and "TX PTT grounded"? (open collector, tested with a 10K pullup resistor to 5V) as enabled in band configuration. No output on either, not when transmitting from WSJT (with PTT configured for CAT), not from from by pressing the "p" button in diagnostics in the terminal interface, and not from pressing T either. It's just not working on either radio with pretty much identical behavior.?

I'll be glad when this gets fixed up. Meanwhile, is there any work-around? Any point on the board where we can pull a PTT signal from? What about the terrible hack of a current sensor on the QMX power input that triggers a relay? Might be more preferable than soldering to the board.

Coincidentally, I've also only noticed this as I begin to experiment with the 50W amp.

Cheers,
Andy KA1PLU

Also, re: PTT output - PTT doesn't output when in CW mode when keying with an external straight or paddle key, so it's not a matter of CAT control being the culprit.