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Peter_Li, To tell the truth, I have not transmitted on 10M. Also, it's a bit cold here in Wisconsin so I'm not presently doing any "Throw a wire into the tree" and transmitting. I also don't have any

Sounds like RFI. What kind of antenna did you use? Did you have protection against Common Mode Current CMC on the coax? 73

My 12 VDC. 1 ADC supply arrived yesterday. Tested out great! 72 over ALL of you, Bill, N4QA/4 in OKI

I've come to a similar conclusion about the availability of a replacement boot-loaded MCU, Instead of starting my hi-band QMX kit I built a hi-band (tr)uSdx kit to go with my lo-band (tr)uSdx. I'm not

Garrett, I usually use an EFRW with a 9:1 unun and the 4SQRP (or ZM-2) tuner. I have not really had any problems with this setup. My most recent setup ended up working just as well. But this was the

Today I used the QMX on the ATU-100 modified for QRP. The antenna is a 2 x 27m dipole. 80m band, tuning rate=40%, SWR=1.3 output = 7.1 W 60m band, tuningrate=40%, SWR=1.8 output = 5.5 W 40m band,

I have been struggling trying to find: 1. The "right way" to wind this T507 2. Why power and SWR was vastly different from other rigs This thread comes closer to the solution than any so far. So I

Glad to hear it!! ?FYI I was able to get 10 turns through a 240-31 core, with the (Buddipole coax RG-58 fat) molded BNC connector, without scratching up the toroid, and without using zip ties -- just

I have an exactly identical sweep to the one you showed. Not sure why, but literally identical. Getting 4.2W out with a 12.2V supply (per terminal reading). Seems to work fine, but definitely looks

Hello Don This is interesting -- the RF sweep in your screenshot roughly corresponds to the measurements that I get when injecting an external signal, yet your RF sweep shows less attenuation than

"an overheating MCU." How was that determined? -- Compton VK2HRX Sydney, Australia

I’m probably just ignorant but 10 C over ambient doesn’t seem all that hot to me. Anyone have measurements from a working radio? Mark KI4HQK

Update: Testing completed and deemed a success. My seemingly-kind-of-maybe-reversed-looking-shaped sweep had no trouble making a 20M DX QSO on a terrible antenna, so for me at least, this odd looking

D109 is really just a short term fail safe (if the regulator loses control of the 3V supply. It /shouldn't/ get activated unless there's a problem somewhere else (like a short to the +12 supply...) If

You might check D109 (the 3V6zener on the #2 plug-in board. Mine was "soft" and although it began conducting a bit below 3.6 volts, it allowed the voltage to climb above 5 volts and caused a hard

Hello Martin, I have the same problem,? see /g/QRPLabs/message/116603 It seems that there is no ESD protection of the CPU at all, so that you have a good chance to kill it. There was

Seems enough that you were to arrive at the reason. Takes a lot more choking at lower frequencies. -- Allison ------------------ Post online only, direct email will go to a bit bucket.

Hi Gil! I had a brief USB failure as well on my QMX, but did not manage to reproduce the issue again so far. I had an Iambic key connected to the QMX and configured as straight key to play with my

Hi pls look at: https://github.com/WB2CBA/Barb-A-Watt-QRP-POWER-and-SWR-Monitor https://www.eham.net/reviews/view-product?id=15586 /g/QRPLabs/topic/88936360 73 de muhsin TA1MHS

Allison, I didn't think those toroids would be enough, but I figured it wouldn't hurt to try. ? -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you;