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I soldered the diode across L14 on the top side of the board.....seemed to work for me. Hundreds of QSOs since and finals are still intact on my QDX. (Made it 440+ before blowing the original BS170s,

My experience with VDD shorted to GND on the main board is that it’s usually but not always in the MPU chip. ?You can determine that with a milliohm meter. ?Find where on the board the lowest

72, Bill, WB4HIO

...is it possible to set the center frequency for either of the QxXes? Happy New Year to all of you! 73 de Razvan dl2arl

For accurate power measurements you need a 50 ohm output impedance, a short cable to a good through line meter and a high quality 50 ohm load right on the meter output (or a terminator type meter) if

FB, Hans ! 72, Bill, WB4HIO

I've spent some time this afternoon identifying bugs with the 1.00.014 firmware. This is what I have found: - calling CQ on 30m CW into a well matched antenna (SWR circa 1.2:1), towards the end of my

That sounds similar to what happened when I fried my output transistors.

Hello all, I have a Rev2 board that I wish to run on the high bands and can't identify, from the schematics, the processor pin that needs to be grounded. Any clues please? 73 Phil G8DDN

Thank you to everybody. I figured the response might be “That sounds about right”. I just wanted to double check. I have a QMX that my son finished building yesterday and I was comparing them

Good to hear it's working! Having a slightly higher SWR on 20m is normal, try moving the 10 turn windings as far as possible from the 1 turn ones, it should improve it a bit. In my case, I couldn't

Hi Danny, Peter, all Attached is a comparison of the QCX vs QMX CW filtering. These are actual measured responses. Not simulation or calculation. It's quite clear how much steeper the QMX filter

Agree. The first time I used a radio without really sharp filtering it was quite a shock just how much activity I could hear above and below the frequency I was tuned on. The QMX is pretty good. I

- ..- -.. .? -.-. .... .-. .. ... -- .-? ..- ... .- -- Chris / W2BPL

The QMX is much more complex than the truSDX. There are many more components and the boards are much tighter. There are more complex windings to do as well. However, if you have done a nice neat job

SOLVED After I fixed SWR bridge transformer, output has changed (and increased) on all bands. With a fully charged Li-Pol battery and dummy load: 80 meters: 6 W out 60 meters: 6.5 W out 40 meters: 5 W

I don't see how there can be any confusion.? Each end of the 10 turn winding has a wire that comes out of each end of the toroid and there is a hole for the 10 turn winding next to it. The obvious

P.S. now I realized that in Power/SWR display the TOP bar is power and the BOTTOM bar is SWR (BTW I think this is not explained in Operation manual). With my SWR transformer screwed the top bar was

Hello, Adrian, thanks for the link! I checked the windings. They look the same as in NorCal power SWR meter as well as the photo in assembly manual. So then the only other possibility was that one end

Jim, Thanks for your advice. I decide to leave it there for now. I might try the adding capacitor method when I feel it's necessary. 73 de Lun BD8BTE