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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

If anyone has used the QMX+ for PSK-31 please let me know its performance (IMD) and what software you used. Thanks Jerry Porter N5KYD

In my quest to get my QDX to receive on all bands instead of just 20M and 30M, I have boogered it up totally. I wound a completely different L-12 using a T-50-2 but used a wire that looked close to the 28ga that is specified. Now I’m getting -45 to -60 on the RF filter sweeps whereas previously I got -2 on 20M and +2 on 30M approx and then the -45 to -60 for 40M &80M. Thank goodness I’ve got a Hakko desolderer which makes life much easier and I don’t mess up the board. I’ve removed the second L-12, and then re-fastened it making sure I did a good job and checked under a microscope I use for small work. I don’t see anything like wiskers. While I had the second L-12 out I checked the pads to make sure i hadn’t made a crack in one of those. No cracks. All the wires from the new L-12 to the pads show continuity when mounted. BTW all xmit function is fine on all bands. I checked continuity on IC-3 from Pin 3 to 9, 4 to 9, 5 to 9 and 6 to 9. All check good. Question - 1) How much leeway is there in the gauge of the wire for L-12? Is it super critical? Thanks to everyone who has helped me through the process. 73’s. John / K7RLD

In the past, there have been many single band QCX radios out there participating in this event as a 'Bumblebee'. Now we have the multiband QMX radios, which are even better suited. So, I thought that I would announce it here 2025 Flight of the Bumblebees The annual Flight of the Bumblebees will be held on Sunday, July 27, 2025. The event will be in a four hour daytime window, from 1700 to 2100 UTC. This casual QRP CW event consists of 'Bumblebees' who are operating portable stations at outdoor locations, and 'Home Stations' who try to work as many of these 'Bumblebees' as possible. This event is open to all operators. Anywhere. With the sunspot cycle still on the high side, this year's event has the potential to be very interesting. Operators who want to go out and setup a portable station at some outdoor location, and be a highly sought after 'Bumblebee', need to obtain a "Bumblebee Number". The window for obtaining your 2025 'Bumblebee Number' is now Open. This year is is simpler than ever to get a Bumblebee Number. The https://ars-qrp.com web site will explain the whole process. I'll be out there as a 'Bumblebee' - hoping to work you during the event. 72, Jody - K3JZD

I am troubleshooting a QMX+ currently, and still have another two kits to build. I think I need to add an oscilloscope to my home lab. I am interested in a low cost scope adequate to do basic QMX troubleshooting. My budget is $200 or less. Any suggestions? Are the Hantek scopes good enough? I am not interested in $200+ recommendations. I know a Rigol or Siglent would be good choices but they are out of my budget. I think I should be looking at 100MHz bandwidth and 2-channels minimum. Thanks. Steve AK0M

I am helping a friend turn on the QMX+ he built. It all came up initially fine other than one side of the audio output shorted to ground, which has been fixed. LPF, BPF, and SWR curves look great. Output power is 4-5W on all bands except 17m and 6m where it drops to about 3W. Receiver seemed to work well. Awesome! Then I put it into the enclosure and put the nut on securing the bnc connector to the back panel. I checked for any leads protruding from the bottom of the board, and confirmed no components too close to the mounting rails. All looked good. Now, I get no output on any band, and the SWR “S” indicator comes on as soon as I try to transmit. When I run the SWR test again, every band shows a high (8.0-10.0] flat SWR curve that the falls off on about the last 1/3 of the sweep. Taking it all back out of the enclosure again, it now remains broke. My dummy load is good, attached right to the BNC connector. I also tried another dummy load as well as a resonant antenna. No joy. I have a DMM but no oscilloscope. Any suggestions where to start on debugging this? Where would you start if you did have a scope? It was so close….. 73, Steve AK0M

Hi Anybody managed to get Rumlogng on the iPad talking to the QMX? Rumlogng only supports LAN/BLE interfaces on the iPad so I guess it would require a way to convert the usb interface on the QMX to BLE. It all works fine on the MacBook but would be really nice to be able to use the iPad. Any thoughts? Ian G4LXX

Hi, I have released a version 2 of ABS solution. Please refer to the readme front page file at the git repository for full details and release notes: https://github.com/AC8L/QMX_Plus_Autotuner_Internal_Battery_Speaker/ The release includes new PCB fabrication files, BOM and detailed build instructions. This release took into consideration lessons learned and a feedback from first group buy participants fearlessly organized by Cal (AD8Q) and Stan (KC7XE). -- 73, Sardar (AC8L, 4K6SA, VA3DUA).

I would like to share my QMX+ mishap. The Failure I was working in the shack and needed to unplug the buck converter power supply going to my QMX+. Without thinking or checking if the QMX+ was power on, I grabbed the two ends of the Anderson power pole and wiggled the connectors apart. Just as I disconnected the connectors, I heard a distinct loud "POP". You all know that sinking feeling that "you done messed up". You see, I am very careful with my QMX rigs and know that these little gems are very sensitive to the input power and always follow a strict power up/down process.. oh, not this time. So, when I heard that noise and started to smell the magic smoke, I knew that my cherished QMX+ was dead. The Damage When I opened up the rig, I knew that the buck converters were probably toast. I did a visual on the two boards and confirmed that C107 was blown. In fact, there the capacitor was no longer yellow in color, but charred black. There was a nice little burn hole at the top. I did some further inspection and found, what initially looked like, was a hole in the PCB. My heart sank further until I looked at it with a magnifier and found that it was just remnants of the capacitor that needed to be scrapped and cleaned off the PCB board. What To Do Next? I assumed that the internal buck converters are toast. I replaced the 5V, and still the QMX+ failed to start. I then replaced the 3.3V. I was able to power on the QMX+, but there were issues. I found that the current being drawn was at .200ma. I could power the QMX+ off, but failed to power back on until I pressed the power button until all voltage was off the power supply. I checked out the receiver and it appeared to be functional except deaf. Looking at the diagnostic screen and found that the 5V was not at 5V, but at 4.7V. I started looking around the board and feeling the IC chips for heat. It didn't take long for me to burn my finger. IC403 was running way too hot. Chip Removal I got my flux and hot air rework ready, taped off some of the areas to avoid issues and started heating up the board. I found that my inexpensive rework station was just that inexpensive, and never was able to remove the IC. I heated the area for quite some time and was afraid that I might damage the board. Plan B... I cooled down the board and thought for a few minutes and remembered that I got some low temp de-solder metal bar for just this issue. I was able to melt this on each side of the chip and then heat one side and slowly lift the edge. It took no time to lift one side. Did the same for the other and now the chip has been removed. I cleaned off the flux from the board and used "solder wick/braid" to remove excess solder, and re-flux the area. I then re-soldered the new chip in place. Looks like it never happened. Both internal buck converters died, IC403 had an internal short. What was the root cause? I knew from a past experience that there was a transient that took out the 5V converter, but never like this time. I started looking at the buck converter and found something interesting. The Drok buck converter has a feature to "power on" when input voltage is applied. This feature was turned on. I removed the load and applied the voltage to the Drok and wiggled the connector on and off to trigger a spike. That's when I noticed the output voltage spike up to 25V. No wonder why the failure. I turned off the "Power On" feature and repeated the same steps. No further output or spikes were observed. So, if you are using the Drok buck converter that has this feature, beware. Make sure that the power on power feature is off and always power off the Drok before unplugging the QMX. I do still like the Drok converters and the current and voltage adjustments. They can be a bit noisy, but with a couple of ferrite beads and some distance from the QMX, it works great. Suggestions Do not use the Power ON feature of the Drok buck converter. Plug power source to Drok first, making sure that the output is turned off. Connect the QMX to the converter. Once connected, power on the Drok and verify output vol

I hope this isn't a previously discussed and settled topic. On page 30 of the QMX+ V3 assembly instructions, there is a table of toroid LPF inductor target impedances, and the number of turns to wind. Just looking at the last 6 lines of the chart (T37-0 toroids), the suggested turns and the target inductances are not consistent with an online calculator. Some match and some are way off. I used the online calculator (kitsandparts.com) to estimate the wire turns vs inductance for the T37-0. I would post the graph but don't know how to do that for this forum. Only 2 of the six QRP-Labs estimates fall in line with the calculator's curve. My LCR agrees with the online calculator, not the QRP estimates. My experience with the (tr)uSDX informs me that these filters are very important to efficiency and power output. I feel that if I built them as the manual suggests, I would have issues with power output, SWR and efficiency on perhaps 4 of 6 bands. The instructions suggest that I should just wind turns as described in the table rather than target the schematic's specified inductances. That makes my skin crawl ;-) Lee - kf7yrs Part Turns uH QRP uH calculator L516 24 0.44 0.28 L515 26 0.52 0.33 L518 23 0.27 0.26 L517 25 0.31 0.31 L520 14 0.16 0.1 L519 15 0.19 0.11

Do not apply over 12.0 volts to the QMX+, that's what you should do. You blew the the SMBJ13A protection diode at D110, a big rectangular surface mount thing near the power connector. Shown in the lower left corner of the first page of the schematics. It starts conducting when it sees around 15 Volts. If you remove it from the board, the rig will probably start working again. But you won't have over-voltage protection, and must be very careful not to exceed 12.0 Volts. I recommend you order a replacement, Mouser has it, part number 652-SMBJ13A. Jerry, KE7ER On Fri, May 30, 2025 at 06:44 AM, Melih wrote:

Recent kit construction; 1_02 firmware. No power/SWR on the radio's display during transmit. Using PuTTY, Main/HW Tests/Diagnostics: push T for Xmit. Power indication is blank; SWR shows 1.09. External power/SWR meter (Elecraft W2) show 3 Watts (20M) into dummy load; SWR shows 1:1. All other radio functions (that I have checked---the basic ones) appear to be working. FT8 exchanges good. I have reflowed the solder connections to T-507; they look good under magnification. I looked through the manual for operational settings I may have missed. Pwr/SWR display setting is ON. S-meter reads OK. Interesting that the radio diagnostics seem to be able to compute SWR in the apparent absence of forward power data---although QMX reads 1:1.09 vs the external meter's 1:1 on the dummy load. Trouble-shooting suggestions would be appreciated---thanks!

The QRP-Labs HQ is located only 38km from the epicenter of an M5.8 earthquake that struck about 9 hours ago. I hope they are all well. 73 SM6LKM

Hello all I have an issue since updating both my QMX (80-20m) and iPad to iPadOS 18.5. I have used the iFTx app several times and it have been working like a charm. now it seems that the QMX does nor get the sound from the iPad USB-C port. I can see that it recognises the QMX, but can’t do any sound level adjustment. Tried the QMX with my mac and WSJT-X as well to rule out any problems with the QMX. It worked well although conditions were really lousy. But it transmitted correctly. So any ideas what the problem is? It can ve either some change in the OS for iPad or it can be something in the QMX that is not working right. I have been able to copy the new FW to the QMX via the iPad before. But not with 1.02.00 for some reason the iPad did not like it. 72/73 Mikael SM7UDB