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Stojan, but missing some important information. Could you show please screen shots? 73 Ludwig

An internal short in the transformer would do bad things and would likely be sensitive to temperature . It is also a place where its easy to cause said short during construction.? ?using a small

I agree with this, it may only be a small thing, but having a little less than 3W output on Vara is great for the finals, but it would be nice if we could adjust (boost/cut) the level of the audio

QMX+, Rev1 board, 1-00-027 Program I checked the advanced section and all 3 items are set to Enable. I still have a horrible Clunk when keying the QMX+. No clunk when not in transmit mode. So I think

Evan, The? saturated resistance of a mosfet switch goes up with temp...true The yabut is that the gate threshold goes down with heating. The latter means for a fixed drive the mosfet switches on

Just to close this thread out, I had to go on the road for a couple of weeks and was only able to get back work on this problem this week. I removed T1, ?rewound it with fresh wire, and reinstalled

Sorry for all the questions, I thought I had everything working, but now when I open the measurements screen and press the button, nothing happens. It will do an SWR scan with the Serial interface but

Hello Gottfried, Thank you for your help and I did not see your paper until now. As tinkering on this PCB is not so easy, I opted for simulating the 20 / 17 / 15M LPF with RFsim99. A source

Ludwig, thank you for the hint.?Yes, exactly there is something wrong: Values by decreasing voltage: Supply (Multimeter)? ? Supply (Diagnostics)? ?Current RX/TX? ? ? 5V SMPS(Diagn.) 12.1 V?

Stan: I tried to calibrate three QMXs (low, medium and high band) and a QMX+. None calibrated correctly.? About half the bands failed early with crazy plots and stopped at close to 1000 on the x

Stojan, this setting doesn't switch off the QMX, see operational manual. There is an other problem. Could you show please screen shots from Terminal - Hardware tests - Diagnostics for 12V, 11V, 10V+x

Kai, please read QMX QMX_plus Audio PCM1804 ( /g/QRPLabs/wiki/37111 ) from QRP Labs Wiki. Could you send please screen shots from Terminal - Hardware tests - Rf filter sweep and Test

UPDATE: i again did a factory reset and then programmed the QMX+ by display and knobs, not via putty. i saw that is a special "character" for the space sign in the display. Now it seems to work

Stan, - If you did not test the filter as installed in the QMX+, you should. I have already done this. See the attached picture. Note that though the graph is not exactly flat, the gain excursions

Hi Stan, I've investigated this further. The keyer actually cuts out irregularly even when I'm using it normally with my paddle. For example, I simply held the DAH paddle (on the dummy), and the keyer

Installing the new SSB operating software on the QMX+ worked right away. Initial setup was completed without any instructions. Impressive work from the developer! By the way: You can see how to

My QMX is working perfect with 12V, but I would like to try 9V to reduce power on FT8. By lowering voltage with a regulated power supply, qmx is going off at <10V (qmx seems not to be completely off,

I recently finished?building?my QMX. However, when I plug in my headphones to the audio port, all I get is static that stays the same regardless of whether or not I have an antenna?attached or

No, there is no message.? And I don't think any of us know yet definitively what constitutes successful 'completion'. I will give my definition of 'complete' next, but first let me state that you

Most of my bands are below 2 watts,? also I have a horrific "Click when I use my paddle and