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Rico, This is normal. DC current flows through the inductors (transformers). The most common problem is bad soldering, carefully check the quality of all joints. 73 Alan G4ZFQ

Hello experts ? I just finished my build of the QMX 10-20m. During the first tests I found that the device is absolutely deaf on all bands. Measuring the board I figured that I have a short over

Just received my qmx 20-10 ... really the best Xmas gift ever ? thanks Hans and team, wish a very nice Xmas and a happy new year.... vy 73 de Udo DF4BJ

I use a talent cell 12/3000 without any problems... in home shack I use the loading adapter of this powerbank.. works great since months vy 73 de Udo DF4BJ

Hi Roland, Is the resistance between R2/R3 and D1 still “zero” after you have reinstalled C3? If so, as suggested by Evan, please check if there is any solder bridge/whisker. Please check both

Thanks Nick. How many PA transistors do you have? I thought I'd fitted three in mine but I see there's only one. I bought extra BS170s at the time. I'm now looking at housing the transmitter. I

I killed my QDX running off of a fully charged lifepo4. Reached out to Jeff and now I have a working QDX again. Awesome work Jeff. thanks -- 73s, AA6ST Sameer

Bruce, the topic is using PD power banks. Not wall chargers. I've been doing it for years myself. I even wrote an article for QRP Quarterly on the subject back in mid 2020. Wall chargers are indeed

I had a similar temperature-related issue with my QMX.? It would have loud 'digital' noise for several seconds, then be perfect.? And I took it out on a POTA activation, and the noise lasted longer

Surprisingly enough, Ikea makes some decent cables.

Those 1956 eyeballs still have lotsa miles left in them. But after 11PM they seem to go a bit haywire. -- Jim VE4BWG

Essager is good brand with good quality for the price. Combine it with usb isolator modul and you are safe.

No RFI problems both in or out at my shack at current setup. Power is low enough, all ground loops eliminated, usb isolated, single point grounding, coax cables cut to lenght to avoid any accidental

Having the same issue. Got it working for several days straight. Then turned it on a few days later and it can't find the microphone again!

Some more on the QMX mid band high noise. First let me describe the issue. Turn on the QMX. Very loud static/noise. After about 10 seconds, the noise becomes intermittent, and then goes away

Many thanks Chris, i'll try to acquire a regulated power supply during the Holidays and get back to you in January. Sly VA2YZX

They are not intentionally crossed; it is best practice to avoid crossing the wires on the windings. However as you note, it will not have a noticeable effect on the functionality.? When orienting

I would use a pre-made buck-boost converter, like this one I got from amazon: https://www.amazon.com/WWZMDiB-Automatic-Converter-1-25-35V-Adjustable/dp/B0CCHPPKW4 or just search for buck boost

I bought some great cables from? Fannoday on Amazon.com recently. They are very good quality, high speed shielded cables at a reasonable price. -- 73, Dan - W2DLC

No problem Brent, glad to help, we’ve all been there, you’ve only got a few years on me. 1961 vintage myself. Cheers Nick G0OQK