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HI Ludwig, no, the PSU (its a bulk-up-down converter from CN) is working fine. Its the QMX that does nothing - no matter which power-supply I connect. It was even running for some minutes after that

Thanks for your help, Ronald!

That is a normal condition for QMX and QMX+ with the T507 installed, as you saw in the schematic, providing a DC short to ground of the BNC center pin. But it is not an RF short to ground. You are

Hi all, My son and I are building a QMX and we just completed the main board.? I tested for continuity between the center pin and ground on the BNC connector and we're seeing continuity there.? Is

Hello Ludwig, I ran the tests this morning and I'm including a couple of screen copies. I do not really know how to interpret them! Thanks a lot for your help. -- Jean-Jacques - F5IJO FISTS#17008

I removed all four BS170s and tested them.? None were bad. I have new BS170s for replacement now but still unsure why I have no transmit power. Ken AA7JC

UPDATE I now have it working.? I did an reboot and shutdown of everything.? 1st i plug usb in computer.? Qmx off. Then power qmx.? Only com port shows in dev mgr.? Then open wsjtx.? Then go to

I am at the exact same place as you.? Qmx showed up and received fine.? I did drivers prior to using. Then followed g4zfq and now I have serial port but no qmx. Hmmmm.? Did you figure it

So it seems you are suggesting that the current per-band audio level setting be effective only on the USB interface. It would be interesting to know how others use that setting.? Does anyone use

The whole point of calibration is to observe and adjust the way the transmitter behaves at every output power level at the normal operating power supply voltage. If you calibrate at 10V, you will

Peter, I don't know how, but let's assume you made a short across the LiPo. I guess a BMS is connected to the battery. In case of overcurrent the BMS switches of the connection to the outside, no

“When I turned it on again, the display grid was all black dots.” That is similar to my QMX+ after running calibration with vers 007. The battery symbol was also flashing (I think my voltage had

I'm not suggesting it change the mode, leave the mode what the user set. USB, LSB, DIGI.. Just use the USB input instead of the mic input if the CAT command was used for PTT. I don't know. Maybe it is

Hans If I calibrate at 10v (for less PA stress) will this be OK for operation at 12V. Chris

Peter, what do you mean by input pin. Does your LiPo has more than + and -, an input + / - and an output + / -? 73 Ludwig

<panic_attack_on> some days ago I received my prebuilt QMX+ and did not much with it except testing Flrig and WSJTX configurations as well as getting the ssb-firmware onto the precious thing. all

Nico/Stan- My radio is currently out of the enclosure and the board is on the bench; I've been reflowing the inductor/transformer solder joints and looking for shorts.? When I put it back together,

I installed version 009. It seems my old laptop under Win7 can communicate with QMX again. I'm really happy. All bands c alibration was successfully done under version 008. Thank you Hans! 73 Igor

It was the 150% volume, I have no idea how it got set to that but once I reduced that setting to just under 100% all is good. Duh. 73, Bill NZ0T

Hi everyone, I started assembling my Rev4 QDX kit last night that I've been sitting on for years. I got to the step of installing T1, and it seemed to go alright, but when I went to check the