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Ps. If you have a VNA /antenna analyser that can be set to continuous mode you’ve got a low power signal generator already

Martin, Great work! I think you nailed it. JZ

If experience with QDX is relevant also for the QMX, then in addition to burnt PA transistors, the IC that drives them may also be destroyed. That happened to

Martin, I am not the expert, but I agree that the PCM1804 is the most likely problem. 73 Evan AC9TU

Evan, I had already checked, but I doubled checked just now the PCM1804 connections under the inspection microscope.? Each pin got a fine point soldering iron touch to get a good fillet, and a poke

Martin, I have read one post where a lead was not soldered correctly on one of the large ICs.? It might be a good idea to check the pins of IC407 for soldering mistakes from the

So here's what I've got so far.? I'm going to see if I can attach a bunch of pictures for all the diagnostics I've done, but it's looking more and more like the PCM1804 is bad.? Here's the kicker

I found another parameter that needs adjusted for best performance so im collecting all the info in one post here. QDX + VARA = YES! QMX + VARA = can someone test it out for me? I don't have a

This is not correct The QDX (and im assuming the QMX supports the same FSK system) WILL DO VARA THE QDX WILL DO VARA!! The caveat is it can only transmit speeds 1-3 (500hz) and 1-4 (2300/2750hz) I

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