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Thanks for this Gabe! Before seeing this and upon an initial visual inspection I thought the SOT was super close to the tab of the larger fet. I mean real close! Checked it and it's ok but passed

Spencer that's fine. So we have to deal with the not so easy stuff :-( (see my post before that one about the cable). 73 Ludwig

On my QMX+ the battery plus terminal was bent down and not making contact with the battery. ?I had to bend it up 90 degrees to fix it.

I really like the blue and white. ?I’m going to do that on my next one.

I've checked the cable with another rig and no issues were found.? I've also used a different (also known good) cable and had the same type of SWR sweeps.? That was actually the very first thing I

I’ve fixed many, many QMX rigs. ?Every time this happens, the pcm1804 needs to be replaced. ?I first check to see if the soldering is good on the entire i2s bus checking for shorts or cold joints.

And even more. This was not one of the boards with the chip backward. It worked just fine for nearly a year before one of the buck converters failed.

Ludwig, I am aware of those postings. I have played around with all of them, but the AGC settings do not make a lot of difference. It's especially the Side Tone Volume level and alsowhether the Side

Spencer, one more question. Is the cable connecting QMX BNC to the dummy load ok? Could you use a different and good cable? 73, Ludwig

Thank you. It gives me something to look at when I pick it back up. With each issue I learn something new and that is the most fun of building. wrote:

Hi Bill, here ( /g/QRPLabs/wiki/36910 ) you find a description of the power supply system of the QMX and here ( /g/QRPLabs/wiki/36878 ) of the switch on process.

More info. I used the jumper method to get into firmware update mode and reloaded the current version. No change.

Bill, I guess it should be Q103. In case of a short D to G diode D101 should be blown during the first switch on. See also here ( http://qrp-labs.com/qmx/qmxtrouble.html ) (section "Q103/Q104 drains

Bill, for a broken IC203 in most cases the resistance between the VDD rail and GND is very low, only a few ohm or less. Here you find a testpoint (

Luwig, I s your response in connection to my post? If it is, there is nothing mentioned in that link concerning the continuous tone from 12mtr through 4mtr. It would be nice to know if anyone else

QMX would not power on at all. Replaced both SMPS boards. Now it powers up but gets stuck at Initializing: audio system.? Computer sees USB sound device and serial port, but no response to serial

I suspect the component is Q103. If so, see message 123914 from a post by Gabe, yesterday. Especially the link to a video of Hans'. If I am correct, you need to also check the diode and possibly

Recently completed QMX+ with a blue LCD from my junk box as I wanted it to match my 40m QCX +. Used the alternate method of soldering the LCD as suggested by DJ Merill in post #123445 which worked

Hi all, maybe this information ( /g/QRPLabs/wiki/36881 ) could help. 73 Ludwig

Spencer, you made a big step forward. I'm sure you will resolve the remaining issues. The SWR sweeps are also not so good. For both the SWR measurement ( /g/QRPLabs/wiki/36874 ) and