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Hi all, I tried to update my QMX today to the famous SSB SW. But the QMX is not shown as drive in the explorer, although it has worked before several times in last year. I tried all remedies utube offers: Re-install USB device drivers, USB root, power settings, repair windows etc, nothing worked. Even 4 different PCs, win10, win 11 and laptop with linux Mint. All tell the same error message.. Did also a factory reset of the QMX and used 3 different USB cables. No success. The PC see the device, but due to missing name do not not proceed. Could it be a fault in the QMX? Has anybody any advice out there?

Hi Hans, Is there a maintained Feature Request list available somewhere where we can check if what we’d like to see has already been asked for, and perhaps add a vote? I know posts can get lost in the volume, and I expect that is why there was no answer on my question on having variable TX power available as a setting (/g/QRPLabs/message/143397), but I don’t want to bug anyone, so if there was a tracker we could look at, it might save you getting duplicate requests or being bugged by people like me :-) Love the pre-built QMX, am going to get a QMX+ kit to have a go at… 73, Stefan MI0PYN

I waited for and yesterday installed the 1_02_000 firmware. I did a bit of tinkering with the EQ to get some more emphasis in the mid-range (and worth noting that when I do live sound at folk dance events, I always cut back the bass and emphasize, not too much, mids and highs to improve intelligibility of the dance leader, just as Hans suggests). And I made 4 SSB contacts on 20 meters with some Italian stations in a contest setting .... running about 75 watts with the QMX+ and my HR-50+ amplifier. Worked great. Thank you, Hans ... you are a wizard! One glitch ... I cannot get VOX to work. I'm using one of Erik Larsen's microphones, which clearly works fine in PTT mode and sounds OK. I set microphone gain using the built-in Mic Test ... goes red on just the loudest peaks. On USB, speaking into the microphone apparently triggers the VOX, but it then cycles on and off until I manage to get QMX+ mode out of USB over to LSB. LSB doesn't work at all ... speaking into the microphone does not trigger VOX. Input device is set to "External Microphone". And I'm using TRS (stereo) 1/8" mini cable between the microphone and the QMX+. Any hints will be much appreciated! Thanks - Bruce K1FFX

Hi everyone, I've been using my QMX for about an year with great joy and happiness when suddenly my QMX stopped receiving or transmitting. I'm fairly new to radio and i am struggling to find the problem. The sweeps are all garbage on all freqs: RF filter sweep, Audio Filter Sweep, everything but the LPF sweeps. The Voltages seem good although when I press "T", the transmitter voltage shows 9.8v in red. My QMX is 12V. I have little knowledge and i need a hand from you guys, to know where to start. I zipped and attached the image sweeps. 73 Pedro - CR7BJL

Hello! As the title says, I've just updated the firmware and now seeing my radio is showing as 80/60/40/30/20m rather than the 60/40/30/20/17/15 version that was built. I wondered if anyone has any ideas of how this might have occurred? Many thanks! Alastair 2E0UOE

Park US-3843 today, central NC. Low humidity after yesterday's storms. Slight breeze. QMX built for 9w Dork regulator DROK Adjustable Voltage Regulator... https://www.amazon.com/dp/B089ND7PTH?ref=ppx_pop_mob_ap_share Bioenno 9v battery SOTA Beams Bandhopper Palm pico paddle Why I love this rig: even though it is menu-driven, it seems SO INTUITIVE that it doesn't seem difficult to do what I want. Hans must have done some serious human factors analysis with the rig. Also, the receiver is outstanding. I made 24 QSO in 45 minutes on 20. The beacon CW message capability is superb. Thanks to all for the Drok regulator suggestion. And thanks to Hans!! Mark Lunday wd4elg@...

Can I ask Questions about this here? https://qrp-labs.com/lightaprs2 Or is there a separate group to discuss this tracker? Joe WB9SBD

My QMX+ was built by QRP-Labs. It has worked well for about a month, listening and practicing CW. Today I upgraded from 007 to 009 and ran the full configuration routine with a dummy load. The radio felt warm, not hot. It is connected to an OCFD antenna with a SWR a bit below 2.0 on 10 meters. I cancelled Practice Mode, started sending QC while monitoring the SWR (about 1.8 on the display). After about 1 minute, the QMX+ shut down. When I turned it on again, the display grid was all black dots. I removed the cover and adjusted the display pot so it was readable. Turned the radio on and sent CQ a few times. After about 10 seconds the radio shut down again (and again, and again). I performed the factory reset (Twice) and reconfigured the QMX+ for my key and display options (SWR and battery). At this point the radio will power up, the display looks correct and the menus work. CW Practice Mode works, except each character is followed by a loud POOP! Transmitting CW or SSB causes the radio to reset and sometimes it shuts off. Any help is appreciated. Be kind (I've had a difficult day) 73

Unbelievable - I've been doing firmware upgrades on all my QMX, QMX+, etc. rigs on this Mac Mini since the dawn of time - no problems. Well, tonight I downloaded the new v2.00 firmware and was going to update one of my QMX+ rigs and give it a whirl. No problem downloading the file. he problem is that now my Mac Finder refuses to see the QMX device. PuTTY has no problem connecting to it; MacLoggedDX has no problem connecting to it. But unless Mr. Finder see it, there will be no way to move the new f/w over to the radio. I've even re-booted the computer - no joy. I have not changed anything on this computer nor have I done any system updates. Any suggestions? -- Jim / K7TXA Eagle, ID SKCC 10447T BUG 301

I recently built the WA3TFS linear amplifier featured in the March QST. The build went very well and with my old MFJ 20M QRP CW radio, 3W in gives 20W out with a peak 4A draw. So, I tried to interface my QMX+ to it and was surprised to see the QMX+ stop transmitting after the first dit. It would recover after a time and would transmit fine by itself or through the amp but it didn’t like it all when I activated the amp. The firmware hasn’t been upgraded in awhile so I’m not sure if this has already been addressed. I’m not sure the RF detection is maybe not fast enough ?? Any ideas appreciated. 73, Jamie WB4YDL

... by supplying 30 Volts by mistake. :-( . It generated an ugly smell. The QMX plus is now completely dead. When opening the case I saw that a component next to the DC connector was cracked and deformed. I also smelt real bad and is labeled "LG". Whatl else might be damaged - or is it FUBB? In which case I might have to order another kit.... (?) 73, Holger, Dk4LX

The following report is for the latest (SSB-)firmware 1_02_000, 80-20m band version and SSB-mode. When transmitting in dummyload or resonant antenna, the same occurs: At the beginning of the transmit the SWR-meter of the QMX overshoots to maximum level for a very short time (about half a second) and then goes down to the real SWR. Generally not a big problem. But on 80m band the SWR protection kicks in every third or so TX-cycle. I think it is because of the overshoot(?). The other 4 bands do not have that problem Has anybody experienced the same?

I just hooked my scope up to the drain of one of the PA transistors in my QMX+ and kicked off a 160M Phase cal (O button). I am seeing 120 volt spikes during the cal. Here is a link to a screen shot from my scope: 160PhaseCalGlitch.jpg This is going to fry some BS170s for sure. Tony ADoVC

A new chat has been created: I am new to the io system so forgive me if I’m in the wrong place. I understand that someone here builds the K6ARK microphones. I would like to buy one. By: Daniel Garner <debay777@...> View/Join This Chat Do not reply to this message to post to the chat. You can participate in chats only through the group's website.

Well I have done it again. My QMX mounted. I deleted the old firmware and copied the new SSB version. I did notice there was another file that started with e. I emptied the trash and checked the contents of the mounted QMX volume. It was empty. I started to recopy the firmware and the QMX unmounted. It will not mount, nor will the unit turn on. What have I done and how can I fix it? Jim

Hi all, Long press of Select enters the Menu system, displaying "Audio" (or whatever). But while still pressing Select, turning the Tune knob could exit the Audio menu and instead, select another band, up or down depending on the turn direction. This would be handy, especially using the QMX+ which requires 11 Vol button double presses to go down to the next lower band. -- 73 Matti OH6BEX