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Please include me for a US based group buy. -Dj, N1JOV

Thanks for your help, Stan. I'll follow up when I can go through your suggestions with my QMX. I have not yet put it on the air with an antenna. 73, Randy, KS4L

Hi, my QCX has been modified for a passband of around 900Hz and has found more use after the modification. I have a half-built QMX+ and the specs say that cw filter is adjustable from 50-500Hz. Many

All Thanks for all your comments. It took me a while to find this one. I kept pulling and re-winding T507. I was convinced the problem must have been something I had done. I just did not expect the

Bill, If my memory serves, I found that increasing the bias of the IRF510s to 100mA over the starting current resulted in higher output power.? This makes the amp less efficient, but Class AB linear

In for a US based group buy

I wanted to try using WSPR, but every time I reboot, I have to set the time on the QMX again. A friend told me there's a GPS module that can help calibrate the QMX's time. I thought to myself—my

Good catch, Stephen. I had one QMX with cracked and missing bypass caps, but this was seen before I started assembly and didn't require any diagnostic acumen. The two QMX kits I received last week

Yes as a matter of fact. I couldn't find the problem with my QMX Mid-band, so I sent it to Jeff, the renowned QRP Labs Repairman here in the states. Along with a cracked capacitor, he reported R520

Ooooh so cool! When will Hobby Lobby have them in stock? Dave K8WPE

Hi Dave Polar Modulation generated SSB is mathematically the same in the end as SSB generated by traditional filter methods or traditional SDR modulator methods. It sounds the same. The point isn't

OK, I admit it.? This ( PC control of QMX) is getting addictive now :-) Whilst I am adding a gnuradio bandscope to my widget it was much easier just to get a standard SDR project to read the IQ

Not needed. ?Spend the money on a decent iron then scrape and tin with a solder blob For ‘hard as nails’ motor wire either scrape completely with scalpel or burn off with a small blowtorch (also

Bill, I have attached a PDF of the K0IKR message with the scope traces. 73 Evan AC9TU

Hi Hans, I have just viewed you presentation you gave during the FDIM 2025 conference. Very nice. I feel sorry for you atan2 problem. I have written a short note on complex filters for IQ signals,

Hi Hans, I have just viewed you presentation you gave during the FDIM 2025 conference. Very nice. I feel sorry for you atan2 problem. I have written a short note on complex filters for IQ signals,

Just upgraded from pre-SSB version to 1_02_000 and now the QMX doesn't start again. - Only POP at headphones - No display - No serial port visible at computer - With new upgrade all HW tests worked

Roy, the scrape and then add flux and solder works fine and is simple. I had an old Radio Shack 110 v heated solder sucker that I removed the rubber bulb and plugged the sucker tip (so the whole end

I typically use the entire skein of wire (as supplied in the QRP Labs' kits) to wind a toroid. Then I cut off the wire about 3 cm from the last winding of the toroid in question. That way I only use

Measure twice, solder in circuit once. Sorry guys and gals, I couldn’t resist this early in the morning. I usually check each part before installing but lately have gotten a little lazy. Your