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The initial spike on the power button press made me think the body of the volume encoder might have shorted to the back of the power socket. Look for evidence on both surfaces. I let smoke out due to

If it were me, I'd go straight for the solder joints on L506, L510, L511, and L513. Do you have a jeweler's loupe? Those toroids are damn tricky to solder. I scraped my wires with a box cutter after

Hi Tom. Thanks for sharing your experience with PTT Out. When you say it worked initially for a few minutes, was it perhaps working under an earlier firmware version, but not now (under latest, which

Follow up. Also posted to? - QMX Failure on power up - . Checked resistances on 5 V and 3.3 V buses on problem (#2) QMX and compared to my good QMX (#1). They were the same. The #2 QMX connects to

Follow up. I will post this to a new thread - QMX Failure Discovered - , too. Checked resistances on 5 V and 3.3 V buses on problem (#2) QMX and compared to my good QMX (#1). They were the same. The

Hopefully we won't drive Hans crazy, but here are my wishes. Obviously AM, SSB, SWR, AGC and a mid frequency version plus: * A programable low power mode * Protection against high SWR * A tuning mode

Karl, I went back and reviewed this whole thread and didn't see transmit power output for your rig posted (unless I just missed it). If the LPF's aren't working then the Rx plots won't look good. So

Still in 1_00_009 Hold right encoder down long to swap A<->B. This works but now try to change VFO with a short click of right encoder and it does not work. Instead it transfers A to B (Combo

It helps if your iron temperature is set high.? Otherwise the enamel doesn't burn off as easily. -- Paul Elliott - WB6CXC

And they are available from Digi-Key for $1.20

One of your LPFs is good 40 and 60 share one. On the schematic the top and bottom LPF are the ones you need to double check -Mike/w1mt

Thanks for the quick feedback, Mike.? I'm getting close to the limits of my electronics skills. Will be checking the LPF LC connections for starters.

Check that you don't have the Q103 to Q104 short from a solder bridge during manufacture. Top left corner of Q103 (top tab) to the single pin on Q104. That pops D101. (like mine!) DigiKey must be

I think this is a really good idea.? The power supply boards have the ability to destroy the rest of the radio.? By the time a builder powers on their QMX, they have invested a lot of time.? The

You need to get power out on the two lpf’s that are not working, only then can you assess if either of the two suspect bpf’s need work. -Mike/w1mt

Reflowed the solder, factory reset, did putty RF sweeps all bands with both antenna and tuner as well as dummy load. All sensitivity peaks were at higher freqs with 30 and 20 meters being the closest

My 12V QMX went together smoothly.? The biggest challenge was getting boards to nestling together smoothly into the enclosure.? I got off-track with L401 between assembly instructions and photo, but

I do similarly, some of the time with a butane lighter, especially for heavier magnet wire. But for thinner wire, I use the plasma discharge from an electric plasma lighter. It's faster and cleaner

I just finished my QMX kit and it is working fine. Hans, thank you very much for this great kit and great documentation. I am eagerly looking forward to the formware development that will make use of

Yes, that can work. The keypoint here is to limit the applied voltage so that a 100 percent duty cycle does not result in the destruction of the Zener at the output. JZ KJ4A