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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

Sure, right after making the side tone volume adjustment actually adjust the side tone volume. That's something that materially affects basic operation [lest it cause ear damage while trying to work

It occurs to me that PWR_HOLD runs through Q104--have you checked for the Q103/Q104 short? Jonathan KN6LFB

Of all your measured voltages, 2.16V on the rightmost pin of the 5V connector is the most bewildering. ?That should be the PWR_HOLD signal and either 0V or 3.3V as it's driven by the CPU. Hans has

I put the bench supply up to 9volts and 250ma. Still couldn't shut it down, so the MCU isn't starting. I've looked at the board, and it looks fine visually. There wasn't much I could do to hurt it,

Hi folks, I am trying to use my QDX-M with a Galaxy S-5 phone, using the AndFLmsg app to run Olivia. I am able to transmit Olivia messages OK, using "VOX enabled", as I can receive the transmission on

Just a bit more background:? everything else seems to be working fine...start-up screen (v3.12), gps reporting, transmissions starting and stopping appropriately.

I have had my U3S running (nearly) non-stop for a couple of years with no issues.? WSPR spots reported from Japan to Germany. Recently...nothing. The QRP-Labs Dummy Load reports: 80 meters: 0.022

1.33pf per meter of wavelength and then make the inductance to suit for optimum Q. -- - 73 de Andy -

Good advice. Unless you know how the switch works then this advice should precedence. But just one small note, it can depend upon the switch type. Switches can be break and then make (potentially

I haven’t fully sorted this out but I think that if you assign a com port it survives to any physical port and through restarts. Give this a try: * Open the Device Manager by pressing the?Windows

I am unable to see the QMX on my computer.

I've just inadvertently? connected my QMX to a different USB port on my W11 laptop and it failed to connect the WSJT-X.? What happens is that the different port means that a different COM port is

Anyone tried this 4sqrp tuner above 10w spec.

Purchased and assembled by Hans 2021. Worked flawlessly for a few months and then the tuning encoder started locking up Have replace the encoder three times and once again the new encoder will not