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Hi all SSB firmware was released into beta on 17-Mar-2025 after 9+ months of development. Many thanks to everyone who bravely helped test it and patiently provided their feedback and observations. There are now quite a few YouTube videos, forum reports and other social media mentions about on-air successes with QMX SSB. Now that it has been at least 6 weeks in beta and I believe most of the issues have been resolved, it's time to promote it to an official version. I have called this version 1_02_000 and published it on the QMX page http://qrp-labs.com/qmx where I have also published the updated operating manual, which grew from 111 pages to 134 pages. The main changes are: SSB (obviously!) including CESSB, TX Equalization, Mic AGC, VOX, Pre-distortion and and and... Addition of up to two more USB Virtual COM serial ports (up to three total). All of the hardware tests such as RF and SWR sweep, and Diagnostics, are now available on the LCD too. New CAT commands for LCD contents, S-meter, AGC-meter, Power meter, SWR meter, SSB source Complete list (relative to 1_00_027 the previous official version): SSB modes added (USB and LCB), with CESSB, TX Equalization, Mic AGC, VOX, Phase pre-distortion and more Rationalization of menus, grouped into CW, Digi and SSB submenus (now Keyer and Decoder are submenus of CW) Added up to two more USB Virtual COM serial ports (configurable) LCD versions of AF, RF, Image, LPF, Test ADC I/Q sweeps (miniature graph on LCD) New function PA mod. test to check operation of amplitude modulator Diagnostics screens are now available on the LCD interface too Now remembers previous menu location on ALL menus regardless of nesting level Add way of forcing factory reset, press Menu (left) button during power-up Change TX color in diagnostics screen from red to blue, to avoid confusion since red things are errors Added CAT LC command to retrieve LCD contents Added CAT commands SA (AGC meter), SM (S meter), PC (Power meter), SW (SWR meter) Added CAT command SS (get/set SSB input source) Bug fix: PTT P did not work properly Bug fix: Incorrect PA voltage display on the Diagnostics screen 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Iam working on the 10 watt amp and I need a little better understanding of the power input it will need. I have a Smart Power Attenutator that will give me a 0 to 15 db reduction. I am not sure about the rquirement of the level of rf in watts (mili watts ?) for a drive level. My QMX+ shows average of 3 to 3.8 watts across the bands and I beleive this is just a little more than this little amp needs. Any help, thoughts, or other welcome, but be kind to an old gyser. Thanks all -- 73 ChuckR

Hello. I'm assembling a 50 watt power amplifier for use with a QCX+ that I assembled last month, for the 80 metre band. I have very high harmonics at the output of T3 - as a result, I get only about 9.3 watts out when running at 13.8 V. Output from the LPF looks OK on the 'scope. I found the excellent videos by NA5Y which shows the output of T3 should be much closer to a sinusoid than what I get. I also found the discussion with KO1KR in August of 2020, but unfortunately I can't see his scope photos so I don't know if he had the same problem. I've since skimmed through the many discussions on this forum but haven't found the same issue exactly, though I did check out some of the suggestions given here. I found the amplifier took 67 mA with R5 fully CCW - I adjusted R5 till the amplifier drew about 70 mA with the QCX+ key-down in practice mode. Here are my scope traces: 0092 is the gate drive, yellow is Q1 gate, purple is Q2 gate - all is well here. 0090 is the drain voltage, Q1 in yellow and Q2 in purple - these look like there is oscillation ? 0091 is the voltage at the output of T3. This has a lot of third harmonic and doesn't look like the waveform NA5Y showed at this point. (QCX+ was set for 3.520 MHZ , amplifier connected to a dummy load.) I thought that perhaps my bench power supply is doing something odd when the amp is drawing power, but I probed the 12 volt line right at the barrel connector and the 'scope showed almost no disturbance of the +12 v supply. In frustration, I observed the output of T3 with the 'scope set for a long capture - it almost looks as if the distortion grows with time, for the first few tens of microsceconds the scope showed a small but sine-ish waveform, which over the span of a few hundred microseconds got wigglier and wigglier till it developed into the mess seen in my scope capture 0091. I've checked DC continuity to the windings of all the transformers and coils. I did find a bad joint on the primary of T1 but I cleaned it up and can now get power out of the amplifier. I haven't yet checked bias on all the 1N4007 diodes but the input looks quite sinusoidal at R3 closest to the input. The few watts the amplifier does produce look OK at its output. The QCX+ makes about 4.3 wats into a dummy load (43 V peak to peak) at 13.8 V DC. I'm assembling these units for a friend, and I had really hoped to have them ready for Field Day this year. The instructions are excellent and I have followed them closely. What can I look at next? Bill VE4STW

I've had some issues with my QMX+. When I received the board the L101 inductor was damaged but appeared functional. I had the unit fully assembled and working but then IC101, 3.3v regulator fried. While removing that IC I lifted the pin1 and pin 2 traces. I was able to replace IC101 and put in jumpers to bypass the pulled traces. The 3.3v supply is now working. I decided to replace L101 and managed to lift the pad adjacent to C107. It didn't fully detach but it did break the through board connection to R113. I have replaced L101 and installed a jumper to restore the connection from VCC to R113. I added some extra solder to C107 to bridge over to L101 to help lock it to the board. Here is the issue. On the Diagnostic screen 3V3 SMPS reads 3.31 V so the 3.3v supply is working. However the 5V SMPS is reading 5.75V, and the Supply voltage is reading 13.4V. I have measured with a multimeter and VCC reads about 5.05v and the Supply voltage is 12.1v. Something is appears to be causing the Supply Voltage and 5V SMPS to read high. Any thoughts on what might be causing this?

I finally powered up my CMX+. On 60m and 30m, I get a full 5W output, but on the other bands (80m, 40m, 20m), there's barely any output. There are also some fairly loud birdies on 40m, mostly. I tried adjusting some of the toroid windings, but saw no difference in power output for 80m, 40m, or 20m. Any ideas where I should look first regarding the low power output levels? Should also mention the firmware update went smoothly no problems at all. Dave

Hi all, someone stated elsewhere, that the QMX+ was a good rig for contest. Not really I think. I just used it in the CQWPX as well as my Flex 1500. Well the waterfall is a + for the flex ( I dont want tb buy more hardware to have one for the QMX) and changing the filters directly on the Hercules console is way quicker. I have not updated to the SSB software yet. The 300 hz filter is vy wide on the high side. Strong signals can be heard widely. Nothing after 0 beat. Also strong signals seem to saturate the rx and that was a problem especially on 40 m CW clicks are not nice but that is known. 160 m when the band is used above 1.840 is not workable as all stn from below have a similar signal there again. And then I have still to figure out how to set up the AGC. The hang time on strong signals is too long and that makes life difficult. On the positive side I prefer the audio sound of the QMX+ to the flex. I dont't want to be too critical and I never had a newer state of the art rig to compare. Years back I had a TS 830 and liked that. S next up is the region 1 FD for the QMX+ -- Martin DK3UW

I am on a Mac M1. I basically have everything working except that unlike Windows and Linux, the USB soundcard in the QMX has no way of adjusting output/input levels in system settings. Everything is greyed out. The result is that audio input sits around 22 and might get up to 30 with a strong signal in the decode. Anyone found a way to use third party software to bump up input levels to the recommended 60? Or is there a way to do this on the QMX itself in digital modes? I'm running the latest firmware.