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I’ll post my settings later today, but want to say I definitely have the clicks. In the ARRL DX contest I noticed that the clicks were noticeably worse when there were multiple signals in the rx

Here's my observations on a QMX Rev 1 (80m-20m) and 1_00_017 firmware: I keep AGC enabled. I no longer hear the old objectionable thumps I used to hear at the end of a dit or dah. I do hear key

Ron, I checked continuity to ground all the way from the solder joint of the ground end if the volume pot and pins 5 and 7 to the ground pad on the main board. I did it in stages by checking the

Thanks Hans, That is helpful, I thought from what i had seen that most of us had issues, so my apologies if I have that wrong. I hope someone can do as you ask and then I will do the same and we can

Hello Daimon There are a lot of people using it WITHOUT these issues with key-clicks. So there's a bit of a mystery here. Could someone happy with QMX performance on CW without key-clicks please post

The main LPF function is to cut 1st and subsequential harmonics while maintaining as low as possible losses on band in question. So adjusting *only for max power* (lowest losses on the band) you can

Hi Hans, My QMX is a year old in two months time, and for most of that time it has been unusable on CW for my style of operating (extra dits and dahs mainly the issue, as I am mostly a 20-25 wpm

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