Ooh... That daughterboard is very sexy!? Once you release that I will order multiples.? I have others interested locally, too!? ?This is something needed for all of those Adafruit clone boards!? Like I said before, this is something that I have been shocked that it hasn't been done before and is sold everywhere!?
I can see how a TXCO make or break for WSPR.? I took the ADX-S to my weekend house with the better antennas (which I plan on retiring to once the world settles down more and I am financially able to), and realized that I didn't have anything to calibrate it with.? I ended up using the 200 Hz WSPR band on 20m to do this which was kind of painful, really.? But I did notice the drift on that mode even just receiving.? It's probably okay for monitoring but you'd drift all over the place transmitting without the TXCO on WSPR.? It's not really noticeable on FT4 and FT8.?
The ADX-S is pretty slick... It's easier to deal with than the QDX Rev 1 was... I can fix anything that goes wrong with it and modify it to my hearts content which isn't really the case with the QDX.? It's also much easier to build. Don't worry about the two things I mentioned.? Once I looked and saw both parts were available on Amazon, I needed to get them for my "junk box" stock anyway.? I rather like the standoffs and for the simpler projects the buttons and caps are better than the panel mount buttons I had been using.?
As far as a calibration routine on the ADX-S I am considering a modification to the code to allow you to zero beat WWV on 10 or 15 MHz on receive... It might be handy for doing this in the field rather than using a different receiver or counter to sync the 1 MHz signal.? ?That or using the wspr window...?
That's of course a change to the original ADX and not on you at all.? It's amazing that SSB and AM through it works as well as it does too, just by hooking up an amplified speaker.? That little IF chip has many potential applications.? It works better than it should.? ?Have some on their way from China to further experiment with.? ?Thanks for the fun kit.? ?Looking forward to the TXCO board!
Fred W0FMS/7
Fred Spinner