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As a BIG fan of WSPR for such efforts I can’t imagine why you wouldn’t use it? I could even help on the US side on some schedule, IMO WSPR is the very best mode for this. John KK4ITX Florida

PS Steve KM9G of Temporarily Offline Ham Radio dives deep into toroidal tedium in THIS VIDEO. ( https://www.youtube.com/watch?v=0AJriYSinWc ) Apologies if this is not new info. Todd KE7AJZ --

Ted, Looks good as long as there are no shorts and you still use the "washer and nut" to force the flat sides of the BS170s to make good thermal contact. 73 Kees K5BCQ

On a similar note, here's a simple heat sink that should work well for any of these "finals clamped under a washer" resigns:??

Excellent, Brian. That is exactly what I was talking about. Especially use liquid flux to improve the solder surface tension "wicking" between the 16 pins and the 16 via barrels as Tisha

I wound the Trifilar using tricolors to make it easier and not having to use an ohm meter:) A lot of left over wire from Elecraft kit building.

Trifilar not tricolor. Autocorrect is not electronic savvy.

C406 is a quick way to check the tricolor windings. If it’s not 2.5v then likely the tricolor (maybe an IC but less likely). If it’s good then the tricolor may still be bad and that’s when I

This may be a good time to suggest we pool our "lifetime supplies" of various parts especially the small and smaller SMD parts that can sneak off with one stamp! -- 73 Karl KI4ZUQ

I have a similar problem Marek, TX is OK but in my case no receive at all, and all the graphs flat line. I'll? be watching this space with interest. Paul DJ0CU G4ADF

I had a QDX with similar poor plots traced to an issue with the T401 equivalent

QCX mini has a class E pa different than QDX which has class D PA with two sets of bs170s. In qcx mini one 1N4756 zener diode will do the job. In qdx we need two of them. 73 Barb WB2CBA

I am not sure why Mike suggested C406, but when I built my QMX, on my final inspection under a microscope I found my C406 was damaged.? I never powered up until after I replaced it.

I went ahead and reflowed the USB-C connector per Hans' 52 tips video. Picture of my reworked connector. I also fixed the Q103/Q104 short in about 1 minute with a hot air rework station. --n1bs

My apologies, in my last post I said? "BS150" when the correct part is "BS170". a BIG Thank You to all who responded with diagrams, diode part numbers, etc....! I have the required diodes in my

I would just dab a bit of liquid rosin on them and touch them with a soldering iron and maybe the slightest tap of molten solder on each one. They will wick the solder down in to the connector via

Hey I recently built the 40M QCX-mini, and followed the instructions to a T(1). I took my time with the winding, was very neat and tidy, and I get 4.6 Watts out (13.6V), measured on a QRP Guys QRP

Check the voltage at C406, should be about 2.5v (other end is at ground). -mike/w1mt

Found no Q103/104 short

Dear members, I found some on line and ordered them.?? They should be here soon.?? I will have extras when they get here so if anyone else needs a SMD 0805 47uH inductor please let me know.?? I