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I just/finally bought my QMX+ at Dayton FDIM. Is there an estimate for the upcoming release of version 1.2 of ABS solution for QMX+? Where can I find more details, ie pictures and documentation? Thanks de

There are three menu choices for enabling mic input, 1-ext mic on paddle jack, 2-internal sound card audio (digi modes) and 3-two tone test audio. How do I enable the internal mic on the front panel? I'm new to this, just built the radio yesterday, I apologize if I'm not following protocol here. THANKS! -- Larry N2AJX

Installed the latest firmware. I prefer a lower sidetone, so tried setting both offset and sidetone freq to 600. Normally run 580Hz, but it looks like 600 is the minimum value. This does not seem to persist, when I go back into the menu, I see it has changed back to 700... On my QCXs I just set sidetone freq to 580 and all is good. Any ideas pls ?

Hi folks I have read most of the info on setting up with li k and the qmx...I seem to be able to control the radio and get a receive sig al shown in the vara waterfall. However, when I try to connect, you can see the pauses or bla k portio s on the waterfall, but the rig does not go I to tx mode. Appreciate hearing g what I might be missing. I have tried setting radio to flex and kenwood...same results Cheers Scott

I received my fully assembled QMX about a week ago, but dont have a mic, or a cw key yet. I got the high bands since I am a tech so i could use 10m now, and planning on getting my general in june/july. so all i have done is listen a bit. I was hoping to try digital modes with it sunday afternoon. but sunday morning, i turned it on to listen again and about 5 minutes in i change a few bands and then i hear a sharp sound out of my speaker and the radio goes dead. never to power on again. double checked the power supply which was good. even tried a second one and same thing, no power. i took some multimeter readings while it was unplugged and power doesn't seem to be shorted to ground. however measuring resistance between antenna and ground is very low resistance, like under 1 ohm. i haven't opened it up yet as i haven't heard back from Hans. not sure what next steps would be. Thanks for the help / direction. Ted

What it does: use the LCD to display characters received on the CAT serial port and characters transmitted over the serial port. The RX data could appear on the top line and the TX data on the bottom line. Perhaps an indicator of some sort that shows that data is being received by the QMX. even if the data can't be decoded as printable ascii characters. Perhaps, when the CAT/serial monitor is active then disable the terminal applications mode so that a newline character on the serial port doesn't take over the port for terminal applications. Why? I've been developing microcontroller code to read VFO A on the QMX and display frequency and band info on a remote LCD. I first wrote a QMX CAT simulator program so that I could test and debug the microcontroller code easily. Also I have verified with PuTTY that the QMX responds correctly to incoming CAT commands. When I connect the microcontroller via USB to the QMX I am unable to establish that the two are communicating. This CAT/serial monitor diagnostic tool would help me answer the questions: Is the QMX receiving serial data on the CAT com port? What data CAT commands/data is received? What is being sent by the QMX over the com port. This little rabbit hole opened up with this thread: /g/QRPLabs/topic/scripting_language/112779657 In which I suggest the OM use a microcontroller to speak CAT to the QMX. But then I asked myself if I could actually accomplish what I suggested and, here we are. I am aware of 8.7.3 CAT command test and 8.7.4 CAT monitor in the manual but it's not clear to me how to connect both a terminal and microcontroller to the QMX over the single USB-C port. It would be very helpful if the QMX itself could tell me on the LCD what is happening on the serial port. Thanks and 73, Matt

The wiki page QMX QMX_plus SSB Calibration and Predistortion has been updated by Stan Dye <standye@...>. Reason: Added new intro material, including what works if you don't calibrate, and the risk some few users have encountered in burning finals. Compare Revisions

On my mid-band QMX ....I wasn't going to do it. I'd read several horror stories but then, as an "experimental amateur radio station operator" I couldn't help myself. The SSB calibration routine was a disaster. Blew the 2A inline PSU fuse, and took out the BS170s. I replaced the BS170s with new ones on hand and applied enough heat, visually checked for other damage (none found), then sparked it up. Receives fine and all functions appear to work (Mode, Volume, Step, Band etc). However, when I try to transmit on CW into a dummy load, I'm only seeing about 340mW on 40m and progressively less as I go up in frequency... Any ideas as to where to turn to next would be very much appreciated... 73, Robert VE7ZN

I just built a Pacific Antenna mic kit for my QMX+ and it works great!! If you need a mic for your QRP-Labs transceiver kits I would look at this unit. Very simple to build and inexpensive. 73/GL

President Trump has signed an Executive Order that ends the tariff/duty exemption on small value shipments (i.e. < 800 USD) sent from China to the US. It is not made clear if this change will apply to shipments from other countries as well. This will certainly impact those of us who purchase PC boards, electronic components and modules, and equipment in pursuit of our hobby. 73, Ben K0IKR Here is text from the US government: ¡°Today, President Donald J. Trump signed an Executive Order eliminating duty-free de minimis treatment for low-value imports from China¡­¡± ¡± Following the Secretary of Commerce¡¯s notification that adequate systems are in place to collect tariff revenue, President Trump is ending duty-free de minimis treatment for covered goods from the People¡¯s Republic of China (PRC) and Hong Kong starting May 2, 2025 at 12:01 a.m. EDT. Imported goods sent through means other than the international postal network that are valued at or under $800 and that would otherwise qualify for the de minimisexemption will be subject to all applicable duties, which shall be paid in accordance with applicable entry and payment procedures. All relevant postal items containing goods that are sent through the international postal network that are valued at or under $800 and that would otherwise qualify for the de minimis exemption are subject to a duty rate of either 30% of their value or $25 per item (increasing to $50 per item after June 1, 2025). This is in lieu of any other duties, including those imposed by prior Orders. Carriers transporting these postal items must report shipment details to U.S. Customs and Border Protection (CBP), maintain an international carrier bond to ensure duty payment, and remit duties to CBP on a set schedule. CBP may require formal entry for any postal package instead of the specified duties. The Secretary of Commerce will submit a report within 90 days assessing the Order¡¯s impact and considering whether to extend these rules to packages from Macau.¡±

Last night while playing with my qmx the receiver went deaf. This happened after txing on ssb with IQ mode on and panadapter open. I was using a mic connected to the radio. The S meter with antenna dropped to nearly nothing and I can only hear white noise now. The radio will still put out 5w. I ran my little signal generator into qmx and on receive I hear nothing at -33dbm. At 0dbm (I know quite strong) the signal will get through. Any thoughts? Thank you Ryan KK6DZB

Hi all, This is my first post here so I hope it lands in the right place. A while back I purchased the U3S kit and having constructed it found it to work perfectly on the single band . I have just added the LPF relay board to provide an additional 5 bands. The U3S board has the relay fitted and diode along with the LPF and I have removed the 2 relevant wire links. I must be programming the U3S board incorrectly as the unit only transmits on Band 0, that is it will only show its transmitting on band 0 even though I have set the 5 new bands with band 1 being the highest in frequency. Can anyone shed some light on what I could have missed, Thanks. -- Steve Shuff.

Hello, Has anybody tried this microphone preamp : https://www.analog.com/en/products/ssm2167.html Evaluation boards can be found for about 5€ looks good to me but I am no expert ! 73, Yannig - F4IUJ

I know¡­.. lots of postings on QMX+ microphones here. Does anybody have a single list of working good/cheap mics? Thanks de K2RMA

I finished my QMX+ build last week and it is time to admit this is the first kit in my entire life that doesn't work right away, dating back until about 1980. Since all those other kits worked just fine, I never invested in lots of bench hardware nor are my trouble shooting skills well developed. So, having just finished my piece of humble pie, I am trying to figure why my LCD remains blank. The backlight works. There are no characters or blocks, regardless of the potentiometer setting. I haven't hooked up an antenna or earphones so I don't know about the RF/AF sections. I was able to get my Linux Mint PC to connect via USB-C and using Putty, I put the QMX+ into firmware update mode. It was 1.0.27, now it's 1.02.00 as the firmware update worked fine. The terminal mode confirms that the firmware update went okay. I can browse the terminal mode. All of the front panel controls show "Press", right or left arrows as is appropriate for the control. The only thing is the display never shows anything. It is completely blank. I disassembled the case and removed the front pcb and checked every solder joint on the connectors on both the main and front pcb's. All look good, shiny, no bridges, dry joints, nor whiskers. I'm looking for advice. All I have is a DMM to test with. Lincoln N9IN