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Evan and group. I have something intermittent going on here. Sometimes, QDX Digital XCVR shows up in audio and as COM3 in Device manager. But, sometimes one or both will disappear. When either is

If I understand you correctly, you have already fixed the error, that's great, congratulations In the training documents from moltrecht, there are a few probes that can be set up quickly in the

Hello Evan, and thanks for the reply.? Yes, the test I mentioned above was on the main board alone.? There is a direct short from the vdd connection for the 3.3 volt switching supply board to

wb4hio, Have you set up the audio?? I had the same issue until I got the audio set correctly.? Both need to be set up for Hamlib to be happy. 73 Evan AC9TU

Maybe. Does the "Test CAT" work? Can you connect by the terminal? What is the Hamlib error message? 73 Alan G4ZFQ

Hello Ken, I suggest you separate all the boards and measure the resistance on the Vdd line of the main board.? If that is zero, you can do little other than check for shorts.? In my case, it was

Ouch, Evan. Yes that could do it. JZ

John, I interpret that pins 1 and 3 of the MOSFETs are source and gate.? That would indicate that Q103 and Q105 turn on when holding down the left encoder. You are correct in that Q102 is not

Hello, QMX? Ver. 2 12 volt build After complete success with my low bands unit I built the hi band over Christmas.? Every connection was inspected with a loop during the build and everything was

I have been using the low band QDX for a couple months and it seems to be reaching out when I try (can usually get at least one heartbeat on JS8Call).? I could swear that the last time I checked

Thanks, Alan. QDX does show up in Device Manager at COM3. BTW,? Baud rate is set for 38400 and rig set for TS-440S. Have also tried rig for QRPLabs QCX/QDX. That doesn't work either. Maybe an issue

Without taking my QLQ2 apart I can’t measure the current on the 5V line, but the overall current with 13.5V supply is only around 90mA. So there’s not very much power being dissipated. It has been

Likely bad part they usually shut down rather than smoke. FYI the 7805/LM3xx series is a very old part, I started using them back in the mid 70s. That said its about power, not amps.? The 7805 can

Lutz, May I suggest you invest in a QRP SWR/Power meter with Dummy load? Here's one I built and it's an easy build and is very nice to use. https://qrpguys.com/qrpguys-power-swr-dummy-load I think

Also, check the solder joints at the connector pin that brings +12V to the 3.3V regulator board. JZ [email protected]> wrote:

What is puzzling me is that Frans reports seeing 12V at Q103 and Q105 but not at the input of the 78m33 regulator. It is as if there is a fault of some kind at Q101/R101 that is preventing Q102 from

There is also a power/junction temperature rating.? If you are dropping 13.8V to 5V (dropping 8.8V, 8.8 watts/amp) you will not be able to be able to draw much current without overheating it.? From

Assuming Windows, Device Manager shows the COM port. Plug in the QDX and it appears. Then set WSJT-X. and Baud rate. 73 Alan G4ZFQ

Evan, Frans, Frans, first my thanks for a clear and concise response. It is very helpful. Evan, take a look at Frans' description again , and the schematic, too. .... Q103 en Q105 pin 1 and 3 I

??? WB4HIO