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Ray, You don't mention if it's a Rev1 or Rev 2 QMX and you don't mention the computer and its USB port. If it's a USB C port on the computer and a Rev1, the computer might not recognize the

Thank you for your input, it sounds like heat sinking of the transistors isn't needed so I'll skip that. I did the CPU startup mod and the PA stability mod last night and the radio is still working

So Rob, I went in last night and verified that I am in fact hitting the Arduino Uno at *ttyUSB0* on the Pi and the Uno's lights blinked briefly and then it threw an error saying that the device ID

Nice job! As a further improvement, I would drill a metric 3 threaded hole into the heatsink aligned with the screw hole in the PCB. The added screw will conduct heat from the PCB to the heatsink and

Hi Joshua: Yes. Insanity looms ever larger... Hi Mike: Hans only WISHES and DREAMS there were any such elves... 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl

Hi Ludwig, the answers to the questions are as follows: the problem is "hello RX current". Diagnostika3.pdf was created during transfer. Why transfer? The transmission is OK, I ruled out a fault

No worries, Cliff! Thanks for the kind words! I will always be glad to lend a hand where I can. JZ

JZ, I'm sorry for causing you concern. I was only thinking of your troubleshooting ability, not considering the practicality of someone sending you a rig to fix. Mainly just to get a knowledgable

I'm guessing it was one of the QRP Labs Elves answering on Hans' behalf

The "SWR transformer" is T507. 73, Mike KK7ER

Uh oh, you're referring to yourself in the third-person.? Is that a sign the magic smoke has been let loose from the wetware? Joshua

Cliff, It seems I should have been clearer and more direct in my reply to you! There are things that make it impractical for me to offer repair services to others. *I do not take in radios for

Jim, the likely problem area is around T507. It's construction is on page 44 of the manual.? There are four connection points on each side of this transformer, and with the heavy wire used, and

Bill I have one to sell.? It puts out @ 3 to 3.5 watts on all of the bands.? It is the low band version.? I'll ship it for $135.00.? It is set up for 12 volts.? I also have a couple of 40 meter

FWIW I've been running my classic into an EFHW for 5 years with no heatsink. Never blown a final and there was some pretty extensive WSPR activity early on. Having said that, the antenna is well tuned

Jim, T507 73, Cliff, AE5ZA

I also save my brick, happy! Thanks Nooboy and Brian. I connect SDA to GND, power on, seeing the LED flashing, then disconnect SDA from GND. After reflash firmware, my brick come back to QDX. ^O^

Hi Ray, You don't mention it in your post. Did you turn the radio on by pressing the left hand encoder button? The radio doesn't visually respond to that, but the computer should then recognise it

Well I seem to have a similar problem as the other person. Built the Low Band QMX from the kit, tested with a current limited PSU at 7V then at 12V. No smoke or whatever. Downloaded and unzipped the

Additional Heat sinking (that works) is not simple and would be only be *needed* if there will be sustained high power operation or a particularly hot internal case environment The resistor (R42)