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Hi Roger, I think I'd do that.? If it's running that hot, it's pulling too much current for some reason. Before doing so, I'd have a very close look at your solder work, assuming you added pins.?

Looking for data on what (if any) delay there is in the shipping of a QMX kit and enclosure. My last one took three months from a March order to ship - are they going out now in a day or so? -- Jim /

Thanks, Bruce. Unfortunately, even after adding the user to the "dialout" group, there's still no output via the "cat" command. ...doug

Just wanted to thank Jeff Moore W1NC for resurrecting my QMX.? It had 5V SMPS problems that probably caused the CPU 5V_PWM pin to short.? Jeff was able to diagnose the problem? fix the SMPS board

Yes, good continuity of all five encoder pins, and no shorts to the body of the encoder.? But I will probably check it again in the morning.? That's also the encoder nearest the power supply.? I

That sounds like almost certainly a hardware issue.? Have you checked continuity of the encoder pins?

I understand the sidetone volume and AGC are pending firmware updates.? However, my volume encoder does not work at all except for the push button function.? In the diagnostics panel, all the

I wonder if it's the "add user to the dialout group" issue ... do a search for "dialout" on the group here. Cheers - Bruce K1FFX

Chris, I don't think a resource like that exists. Perhaps a short paragraph or two can be found in the classic text "Transmission Line Transformers" by the late Jerry Sevick W2FMI. Ross' instructions

John and the Group: I think you are going to love the QMX.? As we all know, it is a work in progress but, it is performing impressively for me already.? I can't even imagine how well the little box

Q9 is in parallel with Q11. They are supposed to share the load equally. Perhaps Q11 is defective as an open circuit, or poorly soldered, or just has a much higher than normal on resistance so that Q9

Hard to tell, but a number of possibilities have been mentioned here. In addition to the obvious ones (maybe the other transistors failed open?), the driver IC could have failed, or the replacement

I'm not trying to be harsh, to be objective.? I don't want to upset you.? But I am going to present this as I see it.? If it upsets you, I regret that. Tell me about it!? I've had exactly that

I've wondered about winding toroids and binocular transformers and found very little practical help.? I'm not sure what discipline and tidiness means, or how I can tell I've achieved it (or not). Is

Thank you for all your replies. After checking with my QCX+ I have the same issue. In checking the MFJ-564B manual, I had not adjusted the mechanical settings correctly. I adjusted the contacts gap

On avalanche breakdown: App note from

Thanks Hans, I was aware of that but I was commenting on my experience with the two transformers in my own QDX. I did not make that clear and the context would make it sound otherwise. My

Glad to help, Tony! LTSpice is an amazing resource, helping us to see the otherwise unseeable! Regarding transformers for QDX, a sloppily wound conventional transformer will function but with

Hi Tony, all The main motivation for WTST and RWTST was that they completely resolved the parasitic resonance issue which destroyed 10m performance on a percentage of builds. Mysteriously not all,

My OLG2 works great with my QRP Labs Shack Clock. Now I want to use it (separately) via USB to a Raspberry Pi. The device is recognized as?/dev/ttyACM0, but when I type "cat?/dev/ttyACM0" no data