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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

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

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 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

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

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

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

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

Hi all, I’ve completed assembly of my 60–15m QMX. It powers on and passes the RF and SWR sweep tests. Test ADC I/Q shows sine waves, particularly on 60m. I can hear what sounds like FT8 on 7.074 MHz in DIGI mode, and the tones appear to cycle every 15 seconds as expected. However, I’ve noticed that disconnecting the antenna makes little or no audible difference — there’s no significant drop in the noise floor or change in the signal. Additional observations: The BNC center pin shows ~0 Ω to ground (I understand this is expected due to the SWR bridge). BNC center has continuity to one side of C510 and C526. Test ADC I/Q and scope work as expected. Reflowed L506, L508, L510, L511, L512, and L513 for better LPF continuity. I’ve confirmed IC402 pin 13 is not grounded, but I don’t have continuity from the BNC center to pin 13. At this point, I’m hearing what I believe is live FT8, but the lack of change when removing the antenna is making me question whether the antenna signal is actually routed through the intended receive path. Would appreciate any guidance or suggestions for what else to check. Thanks! -Tanner

I am helping a friend get his newly built QMX+ kit into operation. What software user interface “front ends” is anyone using to control the QMX+ from a PC over CAT? I presume FLrig is one option. Hopefully I am not overlooking something obvious. I haven’t explored NaP3 or the other SDR packages yet, but having a panadapter/waterfall would be nice. Appears to be possible, I just don’t know how complete the UI would be for controlling the rig. 73, Steve AK0M

Seems I found a new issue with the QMX+ I built a few weeks ago. After fixing the power supply (thanks Ken), I found that the 40-20 meter bands were dead and exhibiting random "pops" the sound like a ball bearing in a tin can. Here is what I found: - Transmit works correctly on all bands. - The transient is not related to the signal path through the CMOS switches. Other band groups receive as advertised. - There is a large voltage transient on the output IC403 that corresponds to rather random signal on CLK1 into IC403 from the clock generator IC 204 (MS5351). On all other band groups, the CLK1 looks normal. So my current suspicion is that the I2C command being sent by the micro is simply not doing the correct thing with the clock chip. The SDA and SCL signal levels look fine and are reliably setting the clock in other bands. I've tried a factory reset a couple of times with no change in the behavior. Ideas? 73, -- Brent DeWitt, AB1LF Milford, MA