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Is there a possibility that the bootloader is damaged? The first few times i have seen the qmx drive come up but it was closed by the MAC due too much power. At one time i tried to copy the new

Hello Greg, I am using rev 1. The USB cables should be fully data i used them for my NanoVNA i used Windows 10. Tried also an older Mac with an older OS. No luck so far. 73 hanz YL3JD

Not that it makes much difference in the scheme of things, I have built the last three QMX+ kits using .40mm wire (AWG 26) for all windings. For me it is easier to handle, I have it on spools in

Hello Greg, Many thanks for your points, i check it tonight. Now at work :-) Thanks 73 hanz

I have superficially similar behavior on 6m (QMX+ rev1). But I have not gotten around to troubleshooting it since I don't use 6m too often. Replacing the PCM1804 is beyond what I would normally

Thanks Nick, This is what i measured on JP104 See picture with the numbers at the measure points: 1. used as grnd 2. 6,9V 3. 7,7V 4. 1,14 5. 3V 6. ?0V I hope this makes sense. I feed the QMX with

Good? morning Hanz I've been watching this thread and have some comments and questions. 1) What revision is your QMX? 2) Are the USB cables you are using known to be fully data capable? --- There

Thanks Bruce and Ronan, I was a bit confused by 74ACT08SC and 74ACT08SCX. One in SOIC-14NB and one in SOIC-14. Only a small difference in some geometrical parameters, but maybe important for QMX. So

Is the 3.3V VDD rail present Hanz?

Oh no, How do I unsee this?! =) I can't get rid of the obsessive thought of rewinding it with 0.33 wire =) (this is partially joke)

p.s. i use 8volts as power

Hello Nick, It still draws 150mA when a push the encoder. I tried what you wrote but the computer still does not see a USB. Difficult issue. 73 hanz

Ed, No, I wish I could go to one of those, but I have to work. I don't have much time for ham radio these days. -- 73, Dan - W2DLC

When you say ‘now nothing happens anymore’ do you mean the QMX is now no longer drawing power when you push the encoder button, or is it completely dead. the USB socket on the circuit diagram is

Rob, this has been discussed on the group here previously, this is a common outcome for the high band QDX builds, my rev 5 was this way, too. 20 and 17m share the same BPF, and there's interactions

dr operators, I checked the 5 volts on the usb connections on the pcb. A4 A9 B4 and B9 measure 5 volts.(see enclosed documents). I see no splashes of solder. I tried an other USB cable. I try to find

I ordered mine from Farnell.? The part number was MC74ACT08DG manufactured by ONSEMI. Cheers, Ronan MM0IVR

many thanks for the suggestions, i did a lot of checking and used 2 cables. i will focus on the power of the usb, now knowing it is separate from the power of the qmx. many thanks will let know what

I had a QMX+ (rev 2) I recently repaired that had a similar symptom. ?A tone was present on some bands but not others. ?There was also a bit more noise than usual. ?This is all with a dummy load

Hanz, This should not happen. The USB 5 volts is not connected to a QMX. Check the USB cable. Make sure the 5 volt connection is not shorted to ground. Check the cable alone. Then with it plugged