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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

Hello, I am interested in enabling the IQ and displaying the information on my PC. I know it's possible but I have never attempted it. What SDR software should I try (I run both Windows & Linux) Has anyone done this? Please share your experience Is it simply a matter of enabling IQ in the Digi menu and pointing to the sound card from something like SDRPlay? Thanks in advance!

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

I am wondering if this would be possible with future firmware. Is it possible to have the demodulated audio sent over usb for digital modes (wsjtx, fldigi ect) and IQ output on a separate audio feed from qmx at the same time? Since we have a computer connection anyway it would be nice to have the panadapter open using the IQ feed and digi mode open on demodulated audio at the same time. They can all be linked together via hamlib. Ryan KK6DZB

I built a version 1 QMX+ transceiver which I really like. It seems to work well on the channels I use which is 40-20-15-10M. I recently updated the firmware to version 1_02_000 and I am impressed with the SSB reception. At this time I took the opportunity to connect the transceiver to the Ham Radio Deluxe software which definitely helps me to scan the bands. But I have a reoccurring problem in that my computer does not always recognize the QMX+ and I will get a Device Malfunction when I connect up the patch cord? I have rectified the problem by rebooting both the computer and QMX+ which seems to work. I have a new HP 64 bit laptop running Windows 11 Home software. I was hoping someone could tell me if this is normal? I would like to run the Hardware Tests Menu and I was hoping someone could walk me through using the Windows 11 PC Terminal Emulator. I understand that I should use the Windows PowerShell Terminal App? I opened the Terminal App and realized it is DOS based with which I am very rusty. It has been 20 years since I have interfaced with DOS and I don’t want to jump down the proverbial rabbit hole. What commands do I use and is it fairly straightforward? The QMX+ is my third QRP Labs kit as I previously built a 20 M QCX-mini and an upper band QMX transceiver. Also have a lower band QMX kit coming so I have something to build this summer. Always amazed at how well these kits perform without adjustment. I built a Heathkit HW-16 in High School which was a blast but I had to get a friend who worked at the local TV station to tune it for me.

Dear gang, I have finished building my QMX+ Rev2 ( my QMX+Rev 1 Never made it to operation). Right now I am a little gun shy of turning Rev 2 on. I did buy one of the power supplies that freezes the current output so you don't blow it up turning it on, But I have not had the guts to hook it up just yet. The Operations Manual talks more about the QMX than it does about the QMX+, so it has some good general information but the QMX+ to me is a different breed of cat. Is there someone in the group who has written or video'ed the basic light off procedure for the QMX+. I have gone over the PC board multiple times looking at all the solder connections and went over the parts placement plus when I was building it, I read the part numbers 3 times before I soldered it in. I made it carefully through the build without having installed the wrong part in a spot. So if someone has an outline of steps to go through in the initial power on of a completed QMX+ Rev 2, I would really like to study it and see if I can get mine going. Thanks for the help, 73 Dave WA5DJJ -- 73 Dave WA5DJJ SUPER QRSS/WSPR (160m to 6m) GRABBER https://www.qsl.net/wa5djj/ WEBSITE: https://www.zianet.com/dhassall/

I have an unbuilt Rev 1 QMX kit, that I am finally seeing time ahead to build it. But am wondering, would I be better off getting a Rev 3 kit. Are there significant upgrades or differences in the current version that would make it worth getting the new kit revision? Tnx Paul w2eck

Pleasant experience having Jeff fix my QMX. Very fast turn around and detailed repair report.

smeone to fix qmx+ must be in usa.