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Another QMX quickly repaired by Jeff. It is a mid-band version. always good to know that if you build one of these and it doesn’t work there’s support from this group and hands on support from Jeff. thanks Hans, Jeff and all those on line helpers. phil K3UT

Not intended as a prompt for actual updates to the excellent manual, more for information purposes in case someone is compiling a list for when Hans accidentally falls into a cloning machine and can spend time updating manuals instead of the important stuff like bug fixing and adding new features. Also, apologies if this has already been posted but the search facility doesn't work well for me unless I guess exactly the right search terms. The warning at the bottom of page 54 about power supplies is duplicated at the bottom of page 55 and then again on page 56. Given the critical nature of this warning, and that 99% of us would assume that the device would work safely on a standard bench supply or battery, repeating the warning may not actually be a bad thing so maybe it would be better not to fix it! On second thoughts, given the humorous writing style of the instructions, this may be actually be a deliberate ploy on the part of Hans to make sure we get how critical this is. In which case, well played sir - you got me!

My V1 80-20m QMX has had issues with a glitchy VFO encoder. It would often skip in the opposite direction to which it was being turned which made tuning a bit awkward and menu selection even more so. After taking the encoder out, dismantling it and cleaning the contacts, the issue was much better but still not great. I tried replacing the encoder with an AliExpress part that was linked in another thread but the A/B switch contacts were reversed on that one, requiring short jumpers to be run from the two outside encoder pins to the pads on the opposite side. Even then, those encoders were a bit pants (I tried a couple). On a hunch, I re-fitted the original encoder and soldered a 10nF SM capacitor from each of the two outer pins to the common ground pin. This has now completely cured the glitches and the encoder works smoothly and accurately. I can now tune accurately and step through menus in the order they're meant to appear. Happy Days ?? I've attached a photo of the bodge in case anyone else is having similar issues and wants to give it a try. If the photo doesn't appear, here's a link: https://photos.app.goo.gl/RT9evC3BRUaaDSKe6 Cheers, Ronan MM0IVR

Hi, I received my QMX+ kit two weeks ago. I carefully constructed and tested it. It works perfectly on CW, on all bands. I don't operate digital modes or SSB so I haven't tested those modes. I've been building homemade, KD1JV and Elecraft QRP radios for decades so I am an experienced builder. This was a build project for me as I already have an earlier QMX. I just enjoy building projects. Price is $175 + shipping. The total I spent for it. I accept a personal check, or money order. Contact me at my QRZ email address for more info. Tnx, Thomas - ac7a

Greetings all, So yes a firmware upgrade issue. But I have not seen this particular issue or this process described. Fully updated windows 10 Tried all 6 USB ports on my PC Rebooted multiple times. Win10 either see QMX as an audio device or says the did not give a proper driver ID and win10 disabled the device. Now wait! With everything connected and QMX NOT recognized by Win10 I went: QMX, Menu/firmware/sure?/ yes And THEN a popup window on my PC came up, QMX shut itself down and the Popup (in my case i:/) was QMX with firmware 1.00.027. I opened the folder on my D:/ containing the new 1.02.000, dragged it into i:/ immediately that popup window closed itself and a second later QMX came back alive, on its own, with the new firmware installed. Yeah! But... With that done QMX has again disappeared from my win10 PC? Is that the way it is suppose to be? Should I be able to see QMX whenever I plug it in my PC or does it just briefly appears during the firmware update process? Cheers, a.

Has anyone installed a rechargeable battery in the QMX+? If so, would you share the details, such as what brand of battery and how you wired it inside the QMX+ case? Thanks. Hiroki AH6CY

Has anyone tried replacing the USB B connector on the QDX (or any of the other Q*X radios) with A USB C breakout board like this one: https://www.adafruit.com/product/5807 Either with or without using the USB C for power delivery? Thanks, Nate KV4RD *** Nathaniel Drexler

I'm the proud owner of 2 QMX's. One I built myself (s/n136) and one that was built by QRP-Labs (s/n 1137). I installed the PTT mod in both units, and I installed 1_02_000 firmware on both QMX's. As soon as the SSB (beta) firmware came out, I built K6ARK's mini-mic and both the mic gain test and PTT diagnostic tested fine when plugged into the Paddle jack. I checked the mic wiring with an ohm meter and everything was correct. My problem is that I cannot get either QMX to transmit in USB or LSB mode by pressing the mic PTT button. When I press the button the audio blanks out but there is no RF output. However, if I switch to CW mode and press the mic button, it transmits a tone perfectly with RF output. I tried resetting the QMX's to factory settings and recalibrating them. I also verified that the SSB configuration is set to External Mic. Granted, I'm a newbie and I probably missed some setting or something else trivial, but I can't seem to figure it out. I have tried searching the QRP-Labs and QMX forums, but I haven't found a solution. Any advice would be greatly appreciated. 73 Chris - KE8VOD

I noticed in a video I watched last night that Hans recommends a 60W soldering iron for building the QMX for quicker heat transfer. I have a Weller WS 51 that I have had for a long time. I am using Kester 63/37 usually at 325F. So is this set up good enough as I start a QMX+ build or should I get a higher wattage soldering ?? 73 Paul w2eck

QMX I have built two microphones. The Radtel one described in the Wiki and the Adam Kimmerly (printables one). PTT is tip to sleeve and the mic is ring to sleeve. In SSB, Input is set to Ext. mic When I push PTT on either microphone, nothing changes on the display. Checked for continuity, tip to sleeve has continuity when button is pressed. When I run the microphone test and talk into the microphone, there doesn't appear to be any modulation. Mic gain is set to the default 50. Obvious I am doing something wrong.

Hello, While performing an inventory of my QMX kit (60m - 15m version), I had some trouble identifying the inductors I received. I believe the following two edits would make the manual's inventory section easier for the reader to understand. On Page 20, the FT37-43 inventory item should have "(dull black)" after it. On page 23, the T37-10 inventory item should have "(shiny black)" after it, instead of just "black". With some help, I was able to figure this out using info on page 38. Again, having these additional comments in the inventory section would be helpful. Cordially, Rob, AH6X

Is there any performance difference between the QMX and QMX+? I'm about to hit the button and order a QMX+ but, since I will be using it pretty much exclusively for portable working (POTA, SOTA, etc) the smaller size of the QMX does appeal. Although having to pick a band set definitely does not. 10m and 40m are both bands that would be useful to me but 60m isn't since I currently only have a UK intermediate license (and 60m regulations are pretty inconsistent around the world) Anyone got any recommendations based on experience of building and using either? Thanks Mark 2E0OIW

The following items have been added to the Files area of the [email protected] group. /QMX-PC-Controller6A.html By: Paul Harrison <dj0cu@...> Description: QMX PC Cat Controller with 100KHZ Bandscanner including Morse Decoder. Experimental. No installation necessary. Save to HDD and run in a browser.

One more possible PSK31 feature: Allow text input using a CW paddle instead of a keyboard. Note that the QMX UART might be tied to some Bluetooth thingie, allowing use of a cellphone. I'm creating an approprate new thread, conversation started by hijacking this other thread /g/QRPLabs/topic/113046586#msg145208 Conversation thus far is summarized below: On Tue, May 13, 2025 at 08:10 AM, Jerry Gaffke wrote: Making PSK31 easy to use on the QMX with just a keyboard jacked into one of the UART ports would make it a killer PSK31 machine for portable use, displaying received text on the LCD. Send that text out on the UART TX line to be displayed on an optional larger LCD and/or possible logging. Optionally append a 32bit CRC at the end of each transmission so correct reception can be verified, this might be a critical feature for serious use in emergency communications. With thousands out there, the QMX could single handedly revive PSK31 activity on the bands. There are better digital modes these days, but PSK31 is good enough, simple, and easy to implement. On Tue, May 13, 2025 at 09:12 AM, Daniel Walter wrote: Jerry, I really like the idea of reinvigorating PSK31 by making the QMX do stand-alone PSK31. It is a great mode for kybd to kybd QSOs. I know you can do that with JS8, but at a very significant time cost compared to PSK31. I would welcome that development. There's also this old post about my attempt 20 yrs ago at implementing PSK31: /g/QRPLabs/message/139336 Ideas from the file /g/ATSprint/files/Archive/KE7ER/pskuc.c may be useful for Varicode encoding/decoding, but the method of converting received audio into a stream of bits is best ignored if your processor has multiply in hardware. Jerry, KE7ER

Hi Guys, the SSB modus for the QMX is awesome. Even with a small Magnetic Loop antenna. I?m Using a microphone of the QRP-GUYs from California, USA. At the Antenna connection (bnc) I also use a LED SWR bridge from the QRP Guys. So I can tune my magnetic Loop antenna with full power about 4 Watts with 11V Supply(3 Watts keep in the bridge resistors..lol, 1 Watt will be used for the measurement) . When the LED goes out, I can switch into the operation mode. I NEVER switch of the SWR Protection off (SWR3 in the Menue of the qmx). Has anybody an idea, if the internal microphone can be activated in the nearer future or will there maybe have to do any hardware change ? enclosed my video :) : https://www.youtube.com/watch?v=NKZ_0NkJAIA By the way, I?m using a DC-DC converter to reduce the voltage to 11-11.5V . And yes, it doesn?t make any noise, believe me, Its a quality module from an european electronic supplier and not a cheap piece of sh.. from Temu ! Im using toroids around the voltage supply cables (lpf). Have much fun with the QMX. YOu really did a great job Hans , 72 de Matt, DL1SER

I know that many of us have encountered issues with the QMX tuning encoder giving strange results, like large jumps or only counting in one direction. After cleaning up a solder bridge between one of the pins on the two pin side and the encoder body the problem went away for me for a day, then returned. What did work for me seemingly permanently was to exercise the encoder several full revolutions in either direction while holding the stem button down. I don't know what the internals look like on these but that has 100% cleared the wonky behavior. It has been 2 weeks at this point with no more erroneous encoder behavior. Hopefully this will also save some folks from needing to replace the encoder or fully dismantle one for cleaning / troubleshooting. 73, Greg, N1TR

Just curious if the thought has been about adding 6m capability to the qmx? I would be interesting and fun to have that band for POTA/SOTA. Maybe a 40-6m version. Just a thought…… -- Jason- Wv3v Las Vegas, NV.

hi, i have been using my qmx+ for a month or two with success on ft8 on 20 & 10m. everything seemed fine. i have a battery power supply limited at 12v & current limited to 1.5A yesterday i decided to try to monitor & possibly send rtty during this weekend's contest. i uncovered the last transmit impediment in this forum (fldigi/modem/tx/transmit-shaping-OFF) and transmitted a few replies. i got 2 confirmations. then i noticed that the transmit power had dropped from ~4W to about 1.5W and checked other bands - indeed i had blown the finals. i replaced them. then i ran diagnostics - normally - i verified that the transmit power (into dummy load) was back where it used to be. thinking it was solved i went back to the rtty contest and during my first transmit - the power supply went into current limit & drew down the voltage to ~6v. i opened up the unit & couldnt see/smell anything, i lowered the supply voltage to 7v & current limit to 150mA. but when i turn on the QMX+ it immediatly goes into current limit. i was able to get to attempt a factory reset, but it didn't fix anything. so - i am hoping someone has a clue for me in terms of at least diagnosis. any ideas greatly appreciated! thanks lars.kn5ute