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Hooked up power, speaker, paddles and antenna. Powered it up, looked for and found the VOX and turned that on, looked for and found how to change from straight key to paddle, changed speed to 17 wpm,

Per first question, I checked for Q103/Q104 short while building as Hans described in video. Looks like I have Q104 and Q106 both dead. Once I picked drains of both off PCB - I can pass at least test

Stan, Thanks for the tip on using the QMX at 1/4 power to set the tuner after a band change. That works and now I don't get the dreaded "S" after the frequency. I don't intend to use the QMX in the

Stan, as requested, here is Jeff Moore's summary of his findings on my rig that was exhibiting wildly fluctuating bias current and simultaneous fluctuating output power. Jeff found under microscopic

Ian, I've been running my QRP rigs at 12V from a number of PD sources using multiple trigger cables, batteries and power bricks, some for up to 2 years now with no difficulties. Glad to hear you are

Stan, Thank you so much for your detailed reply. You are an important part of my education. Jim W0RLD

You and I are in the same club Bill. Jim W0RLD

Bruce, I do encourage people to know what they are doing. It's good we have this conversation to alert them of the dangers of large batteries. Most of us think nothing of barrelling down the road at

Jerry. To save you any more Arc welding experiments :? The maximum breaking capacity I've ever seen quoted for ATO fuses is 1kA at 32V..? ? Which is a lot ... surprisingly so . . but in some cases,

You are correct (as always), Ludwig.? I didn't think of that. In this case I don't see any risk in removing the 3V smps, so that you can measure the voltage on PWR_HOLD without the processor

This is likely due to your use of the antenna tuner while transmitting at full power. When that ATU switches its relays to find a match, it presents momentary 'high SWR' to the QMX, causing it to go

Yes, you can change it using the audio level control in the Band configuration screen (via the terminal interface). It is set on a per-band basis. But I don't think you should.? WSJT-X authors

After making several contacts on WSJT-X, the S appeared after the frequency. I select Hardware tests/ Tune SWR and I get an SWR of 1.00 but when I transmit in WSJT-X, the S appears after the

Stan, There was an S after the frequency at one point but I have eliminated it.? I have disabled the B and Split VFO. Thank you for your suggestions! I removed a Heathkit Power Meter between the

Stan, could it be there is a way without an oscilloscope? When the 3.3V SMPS is removed the controller couldn't boot and you may check PWR_HOLD using a DMM. What do you think? Is there a reason not to

Thanks Ludwig, I must have skipped a step in the math...

Your diagnostics page looks fine for an 11V input. The cause of this is one of the following: a) The PWR_ON signal (JP101/JP102 8-pin connector) is getting pulled low.? It should be at the Vin

Stan, calculating from 1.96V back to the PA voltage (Q507 D) I came to a value of 11.17V, close to 11.22V you measured. 1.96V * ((10k + 47k) / 10k) = 11.17V 73 Ludwig

Shout out to Jeffrey Moore W1NC for the excellent service and quick turnaround on my problematic QMX build. ? He has it up and running and fixed all my build problems. ?Lessons learned. ? I can't

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