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Jerry, Are we looking at the IRF510-based 50-watt class C amp or the PA of the Q_X series? I believe you have a uBiTx IRF510 simulation that might also be relevant. The output is not the TCVM used in

Do not do calibration in one set. Do it one by one with 5 minutes break in between to let the finals have some time to cool down. 20:38, 24 March 2025, "Azgael via groups.io"

Congratulation Hans, this SSB firmware is a great achievement! Still, I have a problem! I had the a QMX plus rev 2 system working on firmware version 1_01_002, preform a calibration and all looked

Hi Stan, Sorry for the delayed response to your post - busy weekend. Solder joints for L504 and L514 looked OK, but I re-heated them anyway - no change, still sounds like a 30 wpm machine gun on

Well this mystery is solved. I had shorted the leads from one of the BS170 finals nearest to the slot that the PCB slides into. Fortunately, the only damage was to that final so I replaced it and the

Yes, and the option "IQ mode" enables a SDR program to be used with a QDX or QMX to do just that. There are some decoders that use the IQ stream directly. 73 Alan G4ZFQ

I cannot imagine, as a newbie? owner of a new QMX+, noting the documents for grammar or punctuation errors. My prime concern is the best bang for my buck and intelligible and adequately explained

Gary, I had the same problem as you.? ?Here is my solution /g/QRPLabs/topic/qmx_and_esd/111241054 Brien - KE7WB

Synchronous AM as well.? Once you have an I-Q data stream you can do any kind of demodulation you want. 73, Don N2VGU

Indeed, LTSpice does not always agree with real hardware. Especially with something like the QMX final and LPF's. Some of the details don't get properly modeled. But it's way better than just staring

Today, I also tried the SSB firmware 1.01.003 on a SOTA actication (HB/BL-005) - see https://reflector.sota.org.uk/t/qmx-announcement-on-ssb-firmware/37704/18 The SSB part works perfect, but it was

So it would be OK for 20v IF you had a perfect output load matched to the transistor? Makes sense. Thanks, Gary! No. Don't even go there. At 20V to get 50W out you would be very close to max Idd.?

Nate, Some additional details: In that old thread I pointed to, I suggest L502 is causing larger voltages across the BS170's than there should be: /g/QRPLabs/topic/111411449 That

https://youtu.be/GkOz4iJQ86A?si=Rl1X3UsRG22i4lf5 Applies to LINEAR push pull amps. The 50W amp is not linear and the rules are not quite the same. Generally for high power amps LTspice reaults are

The 20V is a hard limit gt gate brakdown votlage.? ?The 50V is the peak voltage the drain can see in operation before the internal silicone goes back to sand. The device was specifically designedd

NO!? The pinout is not the same making for odd crossover mods. The max operating votlage for RD16HHF1 is 16V, no exceptions. The max power is 16W per device and a pair cannot do 50W without emitting

Stephan, My 80 meter band phase error calibration graph looks like yours. Another ham said to check where the band center is in your band configuration menu and make sure it is actually set to center

Screenshoot 80m phase error after factory rest

I have a similar pattern in the ‘80m phase error vs DAC’ as Mario Vano AE0GL. I have done a factory reset, no change. Any ideas for troubleshooting? Many thanks to Hans for the SSB software. I

This is correct,? and is the issue. No need to update or change WSJT-X.? ?If you have Hamlib v2.6.1, simply choose QDX or TS-480 as the radio type.? The QMX type is broken in this version.? You