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I think it will be different for each QMX.? It may be associated with LPF parasitic issues or whatever.? I have no real clue why/how these settings affect the calibration. But please everyone, read

Hi Dan, Should we be adjust band parameter just so that we can get a complete configuration run? Because we cant get a complete configuration run, does that not signify that something is not quite

I could only get calibration on 80m to get beyond ~20% by using all the configuration parameters from the 40m band configuration for the 80m band, both frequencies and LPF.? Still required a lot of

I would expect they would look the same, I'm just wondering if the predistortion curve is related to the peak amplitudes permitted by the LPFs. Maybe moving the band edges and centers to center on the

I had a quick look at the 20M LPF curve and it looked the same. I didn't examine it carefully though. Ellis

I'm wondering if there is a correlation between the band edges and centers settings improving the curves and the actual LPF peaks. -- 73, Dan - W2DLC

Hi Jeff, I was afraid of that. While I do have an o-scope and could take readings, it would be an exercise in futility for me. Should the issue turn out to be one of those sub-microscopic components

What’s the version of your wsjt-x and is it on macOS? I noticed a weird bug that wsjt-x v2.7.0 on macOS can deafen qmx every time it transmits or changes the band. Entering the menu then exit

While seems likely you may get version 3, building from a screen works nicely. Just starting my qmx plus build now. Plenty of room on small surface for my screen, kit and tools. It's actually easier

Hey Dudley, The capacitors are trained to hide in the knobs on these kits. Look in the cavity where the shaft goes. I have three of the QMX series kits and have experienced capacitors in the shaft

We had nine folks join the MI QRP Zoom Chat on 27 March. Please join us Thursday April 03 (and every Thursday) at 4PM Eastern for the Michigan QRP Club weekly QRP Chat where the main topics will be

Hi Doug, I agree with Nate that the symptom you describe is not normal.? My guess is that the BS170s are getting warm.? The resistance of a MOSFET increases as the temperature rises, reducing the

Doug, that's not normal, no.? I'm not sure what to point to, though. Something impacted by current...... so could be T1, L14, or BS170 soldering faults? I suppose if something in the LPF was heating

Sorry all who answered. ?Guess I missed reading about the rail and tried to look for my message and erase but it wasn’t listed at the time. ?My 82 year old eyes finally saw the indentations on

Hi Mike, I built both of mine from the pdf on screen.? Works fine.? Before I built the first one, I looked into a proper printer producing a colour copy and simply bound - huge cost (not a problem

Hi, I've just ordered a QMX+. I want to print the assembly manual out. I'm assuming it'll be a Rev 3 PCB but I'm wondering if I should wait until the kit arrives to be sure and not 'waste' paper and

Update. After a lot of fiddling with the 20m band edges I ended up with this: Which leads to this: Which seems to have cured the distortion. I have no understanding of what the frequency numbers

Many thanks, Don and Daniel.? With great sadness I have opened a support ticket, but I agree that there's not really another option for me. Again my thanks, Tim Ei2KA

Where is D110 on the qmx board? I can try to check its state. [email protected]> wrote:

I turned it off with the QMX power switch. Earlier today it was exposed to more voltage for a short period of time but it was still working fine after that. I'm not very good at reading schematics but