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It's safe to run either one on less than 9 volts. You want to try to limit the output power to 5 watts or less. If it's built for 9 volts, then the output power into a 50 ohm dummy load will be close

An educated guess, 12 volt. Try to count the number of windings and compare to the online instructions for QMX transformers.

Hi Hans Thanks for considering PTT TX delay for CW on the QMX's The configuration I use with the PA50+ is semi QSK only. Full break in is out of the question due to T/R relay functions in PA50+. I do

If you have a variable voltage power supply, you could feed them with 9v and see what output you get to a dummy load, and compare with the graphs in the manual. Roger 8P6RX ?Get BlueMail for

I purchased both a QDX and a QMX at an estate sale and I'm not sure which voltage they are built for.? I see in the manual that the T1 transformer can be wound 3:3 or 3:2 depending on what voltage

I took always have to increase the "audio gain" on certain bands to get WSJT-X to decode properly. (I use Ubuntu 24.04). 73 -- David Thomas M0OOR

People like the micro PA50+, particularly after upgrading to the latest firmware. As mentioned, using wired PTT might be safer than RF sense. The PA50+ does have some ACC output, and I believe people

Does anyone know the full part # and manufacturer for the 2 x 3 pin header connector 90 degree plug (male) on the QCX+? One of mine is missing. Jim spikes, N4KH

Ian, there was a discussion about this some days ago. Please read QMX QMX_plus SSB Calibration and Predistortion ( /g/QRPLabs/wiki/39506 ) from the QRP Labs wiki to find the relevant

President Trump has signed an Executive Order that ends the tariff/duty exemption on small value shipments (i.e. < 800 USD) sent from China to the US. ?It is not made clear if this change will apply

Thanks, these are all very helpful tips! I have a lot to learn, that is clear.

While scanning the configuration results, I saw what looked like a prompt to run the routine on a single band.? Perhaps that was wishful thinking???? or perhaps a feature request. I have? 2 and 3

Using detected RF for TX/RX switching will always present a high VSWR (open circuit) to the radio while the RX/TX switching (and in this case, LPF selection) is occurring.? A few milliseconds is

Bruce, I went to Hardrock. Are they only producing assembled amps now?

QMX+ not QCX +.

Can someone explain this error please? "Phase Calibration not possible" 73 Ian G4GIR v .009 QMX 3 v .009 QMX 3 Final screen

Can I ask Questions about this here? https://qrp-labs.com/lightaprs2 Or is there a separate group to discuss this tracker? Joe WB9SBD

I have used Micro PA-50+ for a couple of years. Chinese amp. Uses RF to detect band and PTT so no QMX connection other than RF. Reliable 50 watt out, but needs SWR less than 2. Price about $180 (at

Maybe at 10Hz and 100Hz that would be helpful, but I wouldn't want it at 500Hz and 1kHz - I often want the offset to remain.

The Hardrock-50 plus ATU kits. And I re-worked my HR-50 into the HR-50+ 100 watt amplifier. Good kits, well-done build instructions, and enjoyable to build (especially if you like winding toroids,