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I was able to narrow the problem down to IC402. When I bypass it by disconnecting it from the mixer I can receive on 20 meters again. I've ordered a new part and will solder it in when it arrives to

Hello, Just completed my QMX mini (20-10m). Loaded firmware without issue - use 9 volt battery at about 8.5 v. Initial test with same battery .. low battery indicator, so switched to 9 volt LiFePo at

Hi, I recently finished my QMX. The single and double click on the right rotary encoder knob do not function. Turning the knob for the VFO does function. I checked in the hardware diagnostics and

Back to back zeners were also added to the sBITX to improve its robustness. Users added them to V2 and they were part of the V3 release. -- 73 KD8CGH

I would assume that Hans probably has a better idea of how much that is going to skew the QMX or QMX+ and it is probably different than what was done with the QDX. Tisha, AA4HA

Thanks.... that's what I'll do

Ok. My care package arrived from Turkey today. I swapped out the PCB2 board and I HAVE A PERFECTLY FUNCTIONING QMX!!!! Thank you to everyone who helped trouble shoot and especially Mr. Ludwig!! I’m

Tony: When the SWR protection kicks in it stops any transmission until there is a QMX power reset. The SWR protection does nothing else except prohibit further transmissions. There is a totally

I clean off the flux anyway, "no-clean" or not.? Things that are not there cannot cause problems.? But I am very conservative technically. I am thinking of the tin whisker issue with lead-free

Stan, Tests done using diode mode of a multimeter. Readings are: Q105 AOD403 p-channel mosfet, TO252 package, PCB top. Drain neg probe, source positive - 0L. Source negative probe, drain positive -

Glenn, Keep in mind that even if the audio from the left and right channels are identical now, that may not be the case in the future when Hans implements stereo outputs. The safest thing to do long

Thank you Eike. Right now I'm just using one channel (tip) and the other one is left open, unterminated. " If the signal on both tip and ring are actually mono and always in phase then this whole

OK Chris. I was confused because in your previous reply, you said you had disabled SWR protection. Thanks for clarifying. Tony [email protected]> wrote:

wrote: Tip and ring. Just connect a 10kOhm resistor to tip and another to ring and solder the two resistors together on the other end, then take that connection to the input of the active mono

I have unsoltdered the output of IC101 from the PCB and while testing, it now shows 3.3V when power on is pushed. Current draw is 0 amp. So, problem with a short is further the schematic. -- 73,

This is a mono powered speaker... as I mentioned... " Which output do I use? Tip? Ring? one left open? both tied together? "

I use my QMX with an Anker soundcore mini. Stereo cable on both ends and it works well. There's one data point for you... 72 de va3rr

I just received my QMX+ today. I built a QCX+ previously but this time I wanted the QMX+ to come pre-assembled. So far, I just did some quick tests, receive, transmit, changed a few parameters... The

Tony: I set my SWR protection to 3:1 so the last set of data would not change.

Granted I have only been using this radio two days (and am really enjoying it), but I can't for the life of me figure out how one cascades filters together.? ?In principle it is very clear what the