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I was able to install the 5V regulator replacement today. The QMX started right up. I am still using the original 3.3V regulator. Now on to learning how to use the diagnostics and RF/Audio graphs. I

Hello Luc, is your QCX tuned on 17m and it works on 20m too? Would be a great option for me too! And even better a 12m-15m version of it too. Love to have a WARC band at hand if during a weekend trip

Pretty sure you can't do this because of how the firmware is encrypted. The bootloader needs to be installed by Hans. -- 73 Andrew KI7FXL

Follow up report: Nearly two months ago (August 7) I reported a 'QMX Fail on Power Up'. I repaired the power supply and another IC failed (IC403). That replaced, I no longer trusted the repaired SMPSs

I'm working on a QMX for someone. The display is showing one row of black rectangles. I assume that means the display and the microcontroller are not communicating as in the QCX. The unit is drawing

I had a working qmx and a jumper shorted it out. I had another qmx kit and removed the processor and installed it on the bad board. All works except no audio. I am trying to figure that out! So the

Hi, thank you very much. I think I do have the same problem. So I will solder a new STM32. The question is, how to get the initial boot loader? 73, Holger DL9HDA

FETs can blow in microseconds.? The problem is not the tuning time it is the bad matching solutions and transient open circuits from the relays switching which the autotuner imposes on the

Thanks for the meanwell recommendation.?? I think I found the post I was looking for it was a new way to sire the transformer for the CDX/CMX by twisting the wires.? I have a power pole

The short was in the processor. I've ordered another kit!

I use an LDG AT-600ProII auto tuner.? Before I use a QRP rig I tune up with one of my QRO rigs then switch to the QRP rig. 73, Bill NZ0T

I'm using an Emtech ZM-2 with a nanovna for tuning. I'm feeding a loop antenna with a balanced line (or more accurately, my entire antenna and feed system is a single length of wire) so a tuner that

The new owner of Kits and Parts posted the following message and I thought the QRPLabs might be interested. From Michael Maiorana: "Hello all. I wanted to drop a note with some updates about

DON'T DO THAT! Put it into your junk box, instead! If you ever build another, there are lots of salvageable parts that are useful. Paul -- AI7JR

Harris, if you look at the main board pcb wiring on page 12 of the Assembly manual, it will be even more interesting. Compare the wiring of the pcb with the drawing of Schematic 4:Receiver. Surprise.

Harris, Hole 4 is larger than hole 5 so there is more space to put both wires through it so most people use that for the end of the 28t winding and jumper to hole 5, however some people run the last

Hi folks! Thank you for your responses! I'm sorry, but I still don't feel sure about which turn/wire goes where. Be aware, I am somewhat of an electronics noob, as this is only my second practical

If WSJT-X is used to RX FST4W it can show the spectral width of received signals. To get it to do this an empty file just named "plotspec" is placed in the working directory. In Windows usually the

I found https://www.youtube.com/watch?v=yFFFAMRQHP4&t=5275s to be a good discussion, for those interested, on using FST4W on QDX, focusing a lot on how important clock stability is as you go up in

Rob, The manual (WSJT-X download page) gives all. Just type the MHz into the drop-down box or Settings - Frequencies- right click - Insert. 73 Alan G4ZFQ