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QMX only appears as a flash drive when it's in update mode... Are you saying that you put it into update mode, and you can't see a flash drive?

Thank you Jeff. I appreciate the info. Tomorrow I plan to get familiar with the Terminal programs and will double check the powers out against an Elecraft dummy load for consistency against the

Hi Greg, Here is what I would do: 1) check all the caps in the lpf section - make sure you installed the correct values in the right places. 2) double check the turns on each toroid 3) if all above

Gotta make some room in the shack. I am selling two QDX units, one high band (20 - 10 meters, factory assembled), one low band (80 - 20 meters, kit, built by me). Both are Rev 5 boards. Each has the

Hello again folks: Just finished the build of my new QM (Rev3 - latest -017 firmware). Measured the following RF Output Watts during basic, short, transmit-tune checks ( and some real, live on-air

Thanks to all for the suggestions.? I did take the bottom cover off the QMX and paralleled a 100 ohm resistor on R210.? Now the 50 Watt amp does reliably key.? I use an external harmonic filter on

Hi folks,? Greg KI4NVX here. Finished the build of my QMX Rev3, firmware 1_00_017 yesterday afternoon. Since I bungered my BNC connector during a brain cramp episode, I soldered in a BNC connector

13:00 only Carel PA0MCU as QCX on 30 m plus 3 other QSO's and same in the evening on 60 m? but here DF4BJ joined with his QMX and then one more QSO with SM Martin DK3UW

Hi, I don't know if you have tried this but try using a different cable. I have one from the first batches of the QMX and found that I pretty much have to use a type A to C cable (as opposed to a type

hi Paul, I loaded the different firmware 3 times, but now the PC doesn't recognize the qmx as a flash drive but as an audio device, I don't understand why. Giuseppe iu8eun

Thanks Ron. I'll let you know what I find. -- 73, Dan - W2DLC

Martin, That sounds like a good plan. Good luck with your testing! 73 JZ wrote:

Hmm, would have to steal a signal generator from work, but can probably also use the TX of my KX3 as well [note to self: need a signal generator for the home lab some day].? I did some testing with

Giuseppe-- Once firmware is loaded, the QMX won't show itself as a flash drive. But, there is an option in the main menu to update firmware. Use that, and you should see the flash drive for updating.

Yes, I agree. That is what happens when the low end of the pot is not grounded. I really think this part needs to be checked. If that's not it you might check resistances around the leads of IC10.

The volume control does work, just that it seems the signals are very loud unless I have the volume nearly all the way down. -- 73, Dan - W2DLC

Martin, If you can, set up a signal generator to emit a strong continuous signal to a wire radiator and use your QMX to receive it to produce an audio beat note in the range 500Hz-1000Hz. Probe the

Also, yes, the clock signals are out of phase 90 degrees on my scope, look like nice perfect square waves with little ringing. I went through the QMX related posts I could see, have not seen anything

Yes, the radio was in CW mode.? Also, Q508 is good too, I can use the diagnostics to put it into TX mode temporarily by doing the SWR/LPF tests and watch the node at the drain go to 12V and back.

Thanks Ron. I'll check that. I checked the solder connections of the volume control pot on the control board, but I'll have to figure out a way to check all the way to the main board, or maybe make a