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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

I have not been able to see on the initial first power up any means of loading firmware on my QMX+ radio. I was able to see some evidence of 2 files on E drive which is the USB drive on my computer by shorting AUX2 to ground before power on. The two files in E drive are file 1_00_027.QMX and EEPROM. EEPROM is an empty file.. Have I missed something here or do I have a bigger problem that cannot be solved easily? Any help would be greatly appreciated. Thank you, Ron W6ZQ

Can anyone provide an example of how high the mic input noise level is in the terminal tool with without the mic attached in firmware 1.0.2? I see 3 grey bars in the mic test with the gain set to +50db, which looks significantly higher than Hans' from the manual. I'm trying to determine if I have an internal noise issue with my unit.

I have corrected all the issues with my enameled torroid soldering joints, so those look reasonable now on all bands. That said, I have no power whatsoever when pressing "T" on the diagnostics screen. I am using 3 cell LIPOs charged to 11.9vdc (checked after charging with multimeter) for power. T501 wound for 12v. - Initial startup was at 7v, just to be safe. No issues or magic smoke so slowly raised voltage to 12V with no issues. No pops or anything else. - Checked T507 by removing and testing, then reinstalling. - Removed and rewound T501, RWTST, to eliminate concerns of over twisting the wires. - Rewound T401 and checked for continuity on the 3 pairs, then installed it. - T502 has continuity and the correct amount of wraps. - The dummyload I am using is one I purchased along with the kit. Assembly was enjoyable and it measures 49.5 ohms. When I press "T" I get 0.0 power. I checked the SWR protection set it higher, and restarted the radio, but still get 0.0 on the diagnostics screen. I then turned the SWR protection completely, then restarted the radio and still 0.0. The power transistors DO get slightly warm, but not suddenly. From what I can tell, everything is as it should be, but I'm still getting no power to the dummyload. I have no actual antennas yet, but should have one completed in a couple hours. I checked several patch cords (between radio and dummyload) and they all are working correctly, but still no power. What should I be checking now? Is there a test procedure for this specific issue? There has to be others who have encountered this before... Thanks again, btw... Ahand59

All of my I/Q sweeps look textbook, with the exception of one...160 meters, where the I&Q are way off in both offset and amplitude. Mind you, in 35 years I've not had a single 160m contact, so addressing this is not a high priority! Still, the perfectionist in me wants to get it sorted out at some point. Here is the offending sweep. It seems like the trifilar wound toroid is the usual suspect in cases where multiple bands are involved, but like I said, the other bands look great with nice sine waves (a little messier as the frequency goes up, as Hans mentions in the build manual) with the perfect 90° offset. Anyhow, please take a look and if you have any thoughts, please share them! Bandpass filter? FWIW, power output on 160m is excellent, maybe too good at almost 6 watts.

Based on the large red warning on page 4 of the QMX+ assembly manual it is clear that Hans intended us to power the QMX (and presumably the QMX+) from 9V and tolerates us modifying the rig to operate 12V at our own risk. It is also clear from the discussions I have been able to find that most people opt for a 12V supply (along with various hacks and bodges to actually run it from 13.8 V or more). Given that, for a real world battery I'm going to need a buck/boost converter to get a stable supply that won't kill the rig 9V is just as easy to get as 12V (Assuming I go for a buck/boost converter rather than the three diode bodge) Given that a hardware choice has to be made early on in the build process I'd rather not have to change this at a later point so would like to pick the right option from the start. Has anyone had issues with running either 9V or 12V that might make one a preferred choice over the other? I've seen Druck converters recommended but here in the UK the choice seems to be limited just one buck converter and that needs a 1.5V overhead so would need a fully charged LiFe or Lead Acid battery to exceed the 13.5V I'd need to supply to get a 12V output. If I go for a 3S LiPo battery the voltage range is between 9 and 12.6V (3V-4.2V per cell) making 9V operation or a boost converter essential. There are other devices on eBay that claim to have both buck and boost capability but I have no idea how noisy they'd be.

Searched but did not find anything - Completed the QMX+ build and was assembling into the case when I found that the front panel PCB will not fit into the case. The case is 96mm inside. The case is 99mm between the grooves The front metal panel is 106mm at the widest point The front PCB is 105mm across. Basically I am trying to squish 105mm into a 96mm opening. Not going to happen. Photos are attached -- Since it is completely built, should I try and Dremel 10mm off the front PCB? TIA Michael, KG5UMH