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Hi all I updated the SSB beta testing webpage of the brave, here: https://qrp-labs.com/qmxp/ssbbeta.html and released firmware version 1_01_003 to it. These are the changes: Bug fix: Initial value for noise gate samples was 100 (should be max 99) - makes no real difference but it needed to be fixed Added TX indication underlining the A character when transmitting from USB sound card in SSB mode. Note that the two possible states for this indication are a single dot (indicating PTT has been applied and now the radio is in TX mode) and the solid bar (indicating audio is being received from the PC and transmitted). There is no double-dot like there is in Digi mode indicating insufficient volume, because in SSB mode the radio transmits whatever you give it, even if the volume is low. Bug fix: CAT command TQ1; did not cause transmit when in SSB mode. Now TQ1; and TQ0; work properly in SSB mode. Bug fix: Prevent button presses from accidentally activating VOX, which was happening due to sound picked up from the internal (cancellation reference channel) microphone when you pressed buttons right next to it, and that prevented band change because the second click of the double click was ignored because by then the radio was in transmit mode. All fixed! Now you can click buttons however you like and when button clicks are done, VOX is temporarily disabled until your button pushing frenzy is over. Power meter now reads Peak Envelope Power (PEP) when in SSB mode. Previously it was just reading a sampled value (NOT an average); so if the power meter was updated 10x a second, the updates would just randomly pick a value from the SSB amplitude envelope, which was most unlikely to be its peak value. Bug fixL Calibration hung at DAC 1300 when run on LCD. Now the calibration completes properly when run from the LCD. Many thanks for all the feedback so far, SSB in QMX is getting better and better! 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Hello all, So I updated to firmware 07 and wanted to run the calibration, but I'm getting PA modulation error. Tells me to run the PA MOD test, but I just get a straight line. What can be causing this? Thank you, F4JVU

After assembling a QDX rig for a local ham I received a couple of the QDX PA mod PC boards made by WB2CBA which have the FDT86256 mosfets. They have a max voltage of 150V compared to the 60V of the BS170. Since I like to experiment I decided to try and adapt one of the boards to my QMX+. I filed off the two "tabs" opposite the mosfets being careful not to file off any of the traces. It fit perfectly where the BS170's were. After some testing it seems to work well. My QMX+ is presently wired for 9V and I have a Buck-Boost converter stuck on the back set at 10V so I can use any battery I like from 5V-30V. On 80m-30m I can easily get 5w with the 10v input. Since I like to "play with fire" I plugged in my 12.6V battery and got 6.5w-8W on the lower bands. The mosfets stayed very cool....into a dummy load. While playing on FT8 with my Hexbeam and low SWR sometimes the finals got warm and actually got pretty hot on some of the higher bands but kept work fine. If anyone else out there can or wants to give it a try, especially if you have the proper test equipment please let me/everyone know what you found. The info for the PC boards are here... https://github.com/WB2CBA/QDX-PA-MODIFICATION/blob/main/QDX%20FTD86256%20PA%20Modification%20Story.pdf Tim - K5DEZ

Hi, I tried to use a standard Baofeng micro , the one with a small loudspeaker inside that is not usable with QMX. I have done the easy mods to make possible using this mike with the QMX. No a big issue ... Tried also the Microphone Test tool in the QMX sw, and the mike seems ok using only 40 db for gain. BUT, if I listen with another radio the modulation is very bad .. !! Possibly the two radio too close ?? Unfortunatly, if I talk ,does not seem to exit any RF or just a little bit, from the QMX ( I have a swr/wattmeter in line..). In CW all is ok, in SSB Baofeng micro seems no good. Have you tried the Baofeng Micro ? I guess every body owns one of this mike that why I am asking. 73 de angelo i1jck

The radio is a Ver. 1 QMX plus that in general performs exactly like I expect. It does not have the GPS option installed, and there is no battery in the clock battery slot. The radio is used for CW only. As the title suggests, I have an approximate 1000 tone on only 12M and 6M bands. It is internal, in that I can remove antenna and it's still there. It does not change in level or tone while tuning around the band. It appears to de-sense the receiver a bit, as a signal must be pretty strong for me to be able to copy it on 12M. There is normally a 'beat' frequency between the received signal and the tone when I can copy someone. I have run the I/Q sweeps in Putty, using a raspberry pi computer. The tone is present with or without the computer attached. The I/Q sweeps look very nice on the lower bands, and begin to deteriorate as the frequency goes up. They are still showing the two sine waves, but are a bit distorted( not a perfect line of x's ). This deterioration is also noted on 10M and 15M ( to some extent ) and the sweeps for 12M and 6M are not suspiciously worse than others. 10M works flawlessly, as do the other bands. The remaining filter sweeps look good, with some tweaking needed possibly, but totally functional as is. I have a set of QMX HB and LB radios to compare symptoms, and the HB QMX does not have the 'tone' on 12M when swapped into the system. I am curious what path to take troubleshooting this issue. I did not find anything in the archives that addressed this strange behavior. Thanks & 73 Dick W4PID

Hi all I updated the SSB beta testing webpage of the brave, here: https://qrp-labs.com/qmxp/ssbbeta.html and released firmware version 1_01_007 to it. This fixes one more typo I found in the USB compound device configuration. I carefully checked all 440 bytes one by one in all three configurations (1, 2 and 3 serial port). I believe in the 1-port configuration the configuration is byte for byte, identical to 1_00_027. Waiting for Ludwig to confirm any issues or not with WIn 7. I booted my PC into Windows 10 on the old HD and all three serial ports worked properly, and audio too. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Hi all, Yesterday, I finally found the time to finish building my second QMX (Rev.2, 10m - 20m). Initial setup was easy, and after loading the latest firmware, all tests ran smoothly. Today was its first use, which was also successful with a few FT8 QSOs. But after about 3 hours, the QMX said goodbye with a loud pop. C107 looked like the picture below: https://www.bitquell.de/nextcloud/index.php/s/cf9tbs844aW2mgq I can't identify a cause for this defect. The QMX is built for 9V and was powered by the stabilized 9V output of a TelentCell LF4100. The antenna was a precisely tuned vertical. Will replacing C107 be enough? I'm worried about Q107. Could the burn that can be seen in the picture have been caused by C107, or is Q107 also defective? 73, Joerg DG0JDE

Thanks for letting me join the group. I placed an order for a qmx kit when I found out about the experimental ssb firmware. The boards look to be a work of art. Short of printing a mini mic housing anyone have a recommendation for an amazon mic they have gutted and put the proper element in? I have the modded mic I did for my sbitx I will try, but the element in it now may have too much gain. Looking forward to using this in the field and maybe in the shack! Ryan KK6DZB

Seeing oddities on various bands calibrations., first pic is the old v .003 cal, followed by stages of calibration with v .007. Any idea what the numbering is? and why the end result is so different to the v .003 Is there a problem? I carried out a 40m Cal and there was really little difference to the v .003 trace, plus there was no numbering lines shown. 73 Ian G4GIR O 80m Calibration Ver .003 80m calibration VER .007 50% 80m calibration VER .007 85% 80m calibration VER .007 End

Seeing oddities on various bands calibrations., first pic is the old v .003 cal, followed by stages of calibration with v .007. Any idea what the numbering is? and why the end result is so different to the v .003 Is there a problem? I carried out a 40m Cal and there was really little difference to the v .003 trace, plus there was no numbering lines shown. 73 Ian G4GIR O 80m Calibration Ver .003 80m calibration VER .007 50% 80m calibration VER .007 85% 80m calibration VER .007 End

Hans, I think calibration in _006 is better, but there are still some issues. I am attaching some screenshots from my QMX-lowband calibration that may help in diagnosing the phase-error cals that don't finish, and also a USB IMD optimization that was strange, and fixed itself when I repeated it. I did the initial calibration from a factory-reset condition, using the 'R' option to do all of the optimizations, which I then reviewed. The 80m Phase Error plot didn't complete - it stopped at about 700 on the x-axis. And retrying it with the 'O' repeated the same results. Then I retried a few more times and captured the attached 5 shots of the progression. Note that it for some reason started with a high DAC value, not the one corresponding to the x-axis, which is why it stopped early. Completely repeatable. The 20m USB IMD optimization looked crazy. The other IMDs looked OK. So I retried 20m using the 'O', and it cleaned itself up. See the initial and retry results in the last two attachments. I hope this is helpful- I will check the cal process/results on my other QMX*, and let you know if anything else interesting shows up. Stan KC7XE