QMX+ , An Experimenter’s Fun Radio: some thoughts while unboxing. 

If you are going to build one of these, don’t add a single part to the board before checking resistances at JP106. Vdd and Vcc to ground. Mine were way off, indicating an issue with the MCU.

Absolutely! What is best, SSB and digital filtering are high on Hans's priority list! At least, that's what he was writing in one of his recent posts in the group. Let's wish him good health and us be patient! 73! Linas LY2H

@@Linas_LY2H I'm not gonna rush him on this one because he solved the thump which was my main gripe. I spoke with him at four days in May (I am designing my own QRP CW transceiver) and we discussed the firmware at length. Made me less worried about designing an SDR in the future though

@@JonathanKayne Fantastic! Would love to see your SDR design! Linas LY2H.

Me too! Thanks for a hint for future QMX+ reviews! 73! Linas LY2H

Good luck! Let your soldering iron be hot! 73! Linas LY2H

Great! My first ham radio receiver was exactly a home-built 4-transistor direct conversion 40 m band receiver. It was more than 40 years ago but I'm still missing the sensitivity of it :) Paradoxically, the simple SDR receivers of nowadays also bear the same simplicity and clarity of old days, just in different, digital technology. Wish you lots of fun! 73! Linas LY2H

The QCX plus rigs are all thru hole components (the surface mount stuff is already installed). The mini same BUT very tight and easy to wreck stuff! If you buy a QCX plus and go slow with a magnifier on your head it is OK and the instructions are very detailed and thorough. 73 de VK2AOE.

Congratulations on your new purchase! And sorry for the QMX probs :(. There could be any reasons for it , but my own experience is that the SPS blocks are not so easy to kill :). My first intuitive move would be check and re-solder the encoder's legs with really powerfull soldering iron. I had a problem with my QMX right-hand encoder as it was tuning the VFO somewhat strangely ... Resoldering, esPecially of the ground leg, fixed it. I'm now in the QMX+ building process, and I need a 100W soldering iron with fine tip, as ground points are even more difficult to solder than in QMX, as in PLUS the multilayer ground plane is much bigger. Good Luck! 73! Linas LY2H

@@R50_J0 The official QRPLabs website states it's for everything: "GPS interface for frequency calibration, real time clock and location (internal WSPR beacon)". HTH, 73! Linas LY2H