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Thanks Hans, A friend of mine recovering from two strokes built the QMX before joining this group (showing all the issues) and it worked to his satisfaction. He is sending it to me as a gift as he

It all looks good to me, Bojan 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl wrote:

Hi, these are my first QMX HW test measurements. 73 Bojan S53DZ

Hello Dave I don't think that is necessary. With a lot of effort, messing around with a poor intermittent 12V power supply connection, while simultaneously holding the left knob (power on/off)

p.s. N3AAZ

In this line of emails does it mean one should not turn the power ON and OFF in rapid succession or even semi quickly because it takes a few extra milliseconds for the power supply controls to do

KI7MWA This may help you troubleshoot To measure? "rf"? I use this circuit and a common dc Volt meter (DVM) At 10 mHz and 5 Volts and one BS170 Measure at output of C5 with filter

Hi Pierre, my QDXs are built for +12V. I am using these practices: - added an antiparallel 1N4148 to L14, - using a good +12V PS with a 1A current limit (and no higher voltage), - matching the antenna

Finally what is the best solution to protect the BS170? Solder a 1N4448 or 4148 or 914 in parallel to L14? I read also 2 Zener diodes alongside T1? What should I chose? 73 - Pierre - FK8IH

How does it work with a resonant antenna that requires no tuner such as a dipole or K6ARK End Fed??? -- Compton VK2HRX Sydney, Australia

Thank you all for your helpful input. Cliff - I'd be interested to hear how you get on, if you are inclined to let us know. 73 Chris? G4CWS

Not sure how it will work but would the type C allow the clock to be set by connecting it to a phone/PC?

My guess is the BS170. Seems most likely (assuming the relays are switching.) Check for RF voltage at C5, input to LPFs. 73 Alan G4ZFQ

Thanks Dan All noted, now on my list (the time setting one was there already). 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

I'm curious about what you propose, but that link doesn't show anything. :-( Paul -- AI7JR

Sorry folks - found the short - yes, it was at the BNC socket. Steve

I suppose you know your target market better than I do, and it's presumptuous of me to think otherwise, I apologize. I think I remember reading somewhere that the control loop operates at a frequency

Phil, You also mentioned that the tabs on the rotary encoder broke at one time and you installed wires to repair them. Please check that area for shorts to the rotary encoder housing and that the

Hi Adam - I have the same symptoms as you - my rf sweeps are very similar with no receive or rf out. I've been stuck on this for hours - where was the short you fixed on yours? Did you mean the BNC

Phil, LIN_REG_EN (the middle pin on the top of PCB #2) should be high when you want the 78M33 regulator switched ON and you should have ~3.3V at D103. What does the pin measure ? Ground that pin and