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Jakob, I also suspect CMC after another issue was resolved- see /g/QRPLabs/message/117215 ( /g/QRPLabs/message/117215 ) thread. I was using a base loaded vertical

I'm running 1.10 firmware on both radios. Here are the sweeps across all of the bands for the High Band QDX: Don KD5NRO

Hi Barb WB2CBA is the group maybe he can help? 73 de muhsin TA1MHS

Very low power indicated on all bands while SWR was high on 80 meters tapering to none on 20 into a dummy load! Power was 4-5 watts by measuring voltage at the dummy load. My interim solution is to

Don or Matt, Are you able to post a 15M RF sweep or all of the RF sweeps? 20/17/15/12/10? I'm wondering if one could add 2-3 turns to L12 for 20M, but use the 15M BPF on 17M (instead of 17 and 20m

The hardware device is no longer being sold. Gary W9TD

Paul (and others), Yes, that zener is only the last line of over-voltage defence. I had used the QMX for quite a while before it went dead. It failed before Hans corrected the interrupt priority of

Hi Ludwig, I got almost the same results by measuring inductance using two methods,VNA and cheap LC meter. Yes, it looks like the tolerance is +20-25% for material #17 and +15-20% for material #6.

Hi all, This is a reminder that we have the QCX Challenge (on the regular bands) coming up next Monday, January 29th , at 1300Z, 1900Z and 0300Z (Tuesday). See all info here :

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