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Details about my QMX+: Board rev 2, firmware rev 1_00_027, wired for 12v operation (RWTST output transformer). Running it from a Buck converter set to 10 volts. I recently completed the assembly of my QMX+ kit, and It’s suffering from several problems (low output power: ~2.4 watts, low receive sensitivity, most of the filter scans have the right “shape,” but the levels are low, the IQ scans look fine on some bands, but they are just noise on most bands). Rather than trying to cram everything into one thread, I thought I’d break the issues up into separate threads. Anyway, the problem for this thread regards FT8 (WSJT-x) reception when the radio is in digital mode. When it’s in CW mode WSJT-x can receive and decode FT8 signals. But the radio goes quiet as soon as I switch to the digital mode. I’m having this issue on every band. In the QMX+ “System Config.” settings, IQ Mode is Disabled, Sideband is USB, and CW-R is off. I’ve also disabled VFO B and the Split mode. All communication between the QMX+ and WSJT-x is working fine. My WSJT-x is version 2.7.0 (64 bit) and I’m using HamLib version 4.6.2 (I’m not using the file that is bundled with WSJT-x; I downloaded the DLL separately). The computer is Windows 8 (64 bit). I did some experiments using my FT-817 (connected to a dummy load) to transmit CW to see if/where the QMX+ receives this signal (the two radios are side by side). The QMX+ was set to the band’s “FT8 Watering Hole” frequency (14.074, for example), and I monitored the reception on WSJT-x. To simplify the explanation, I’ll call it “Digital Working Mode” and “Digital Not Working Mode.” Here’s what I’m seeing: Digital Working Mode… · I can hear over-the-air FT8 signals, they are displayed on the waterfall, and they are being decoded. · The CW signal from my ‘817 shows up on the WSJT-x waterfall. · As I increase the transmitted frequency (from the ‘817), the “tone” goes higher. For example, if I transmit on 14.075, the signal appears at the 1000HZ line on the waterfall. When I increase the transmitted frequency, the waterfall mark moves up (higher tone). When I decrease the transmitted frequency, the waterfall mark moves down (lower tone). Digital NOT Working Mode… · As soon as the QMX+ enters this “Digital Not Working Mode”, no signals are being heard. I can’t even hear the signal from my FT-817. · If I DECREASE the FT-817’s transmitted frequency to 14.073 (1000 Hz BELOW the QMX+’s dial frequency) the FT-817’s CW signal appears on the waterfall at 1000 HZ. · When I increase the transmitted frequency, the waterfall mark moves DOWN (lower tone). When I decrease the transmitted frequency, the waterfall mark moves UP (higher tone). This behavior is opposite from the CW mode and from the “Digital Working Mode”. It almost seems as if the QMX+ is trying to receive LSB instead of USB? Switching between “Digital Working” and “Digital Not Working” Modes…. Clicking WSJT-x’s “Tune” button, or trying to answer a CQ, or even clicking a selection from the WSJT-x “band” drop down box (that’s on the left side of the screen) causes the QMX+ to stop receiving the FT8 signals. It seems that any CAT command puts the QMX+ into the “Digital Not Working Mode”. As soon as a CAT command is sent from WSJT-x, the QMX+ stops receiving the FT8 signals. The dial frequency is still on the “watering hole” frequency, the radio is in the “receive” mode, but no FT8 signals are heard or decoded. To get out of this “Digital Not Working Mode”, all I have to do is to enter and exit the QMX+’s menu (it doesn’t matter which menu level is active). Simply by holding the left button and then exiting by tapping the right button allows the QMX+ to receive normally (in the digital mode). Any thoughts? Shouldn’t the received signal on the WSJT-x waterfall go “up” (higher pitch) when the transmitted frequency is increased? When it’s working like that (either in CW mode or in “Digital Working Mode”), I can decode signals. Why does entering/exiting the menu correct the problem? Has anyone else seen anything like this? Thanks much, Larry (WA2VKG) S

... 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

Ok, just installed linux mint , installed js8call and flrig. the three serial ports show up but flrig not talking to qdx. Way way in the past there were some comands i had t issue to get things rolliing, now old and need some memory help :) who can give a list of some sudo ?????????? ????? ?? to issue to insure audio, and other nessasary things work and not go bump in the nite.... here is me begging for help -- 73 ChuckR

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

Does anyone know the full part # and manufacturer for the 2 x 3 pin header connector 90 degree plug (male) on the QCX+? One of mine is missing. Jim spikes, N4KH

Hi, I tried to use a standard Baofeng micro , the one with a small loudspeaker inside that is not usable with QMX. I have done the easy mods to make possible using this mike with the QMX. No a big issue ... Tried also the Microphone Test tool in the QMX sw, and the mike seems ok using only 40 db for gain. BUT, if I listen with another radio the modulation is very bad .. !! Possibly the two radio too close ?? Unfortunatly, if I talk ,does not seem to exit any RF or just a little bit, from the QMX ( I have a swr/wattmeter in line..). In CW all is ok, in SSB Baofeng micro seems no good. Have you tried the Baofeng Micro ? I guess every body owns one of this mike that why I am asking. 73 de angelo i1jck

Hey all! I’m not saying it would be an ideal situation or anything, but does anyone know if/when we will be able to use the onboard mic for ssb operations? I really love the portable nature of my kit and don’t mind using the onboard mic. Thanks! 73 Jeff KB3TVP

Hello there , New Ham , New QDX user where the radio has been donated to me by TRAC friends in Istanbul. I reached Australia , Antarctica and Greenland with a 5 volt pc supply and an untuned cable antenna dropped from a window on a concrete wall. Now , I want to transmit a few hours daily in - digital radio mondiale - mode and I will make a pirate radio. Can QDX help me ? Umut TA2JCO

Ooops, My QMX should read my QMX+. 73 Ian G4GIR ----- Original Message ----- From: Ian G4GIR via groups.io <jean.frith@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 03/05/2025 10:46:17 Subject: Re: [QRPLabs] 6m Phase error vs DAC Just checked out that Wiki article. /g/QRPLabs/wiki/39506 Hans quotes:- "Note that on QMX+ I have never seen this occur;" Hans this is happening on my QMX! The last kit I purchased from you, the previous two kits don't have this problem Can I claim a first!! Lol. 73 Ian G4GIR ----- Original Message ----- From: <DH8WN@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 02/05/2025 16:33:58 Subject: Re: [QRPLabs] 6m Phase error vs DAC Ian, there was a discussion about this some days ago. Please read QMX QMX_plus SSB Calibration and Predistortion from the QRP Labs wiki to find the relevant text, about 'calibration not possible' especially more at the end. 73 Ludwig.

I had been puzzled for a while because I couldn’t get the device to transmit on the 20m band only. Again today, I played around with various settings, hoping to fix the issue. While modifying different parameters in Terminal mode under the Config menu, I discovered something unexpected. It turns out that if I set 'Japanese band limits: ENABLED' in the Configuration, it restricts transmission to the 20m band only. When I switch it back to the default setting 'DISABLED,' transmission becomes possible on all bands! What a surprise! I really think this should be clearly mentioned in the manual. With this, I now have a lineup of two units — the 5-band version (80–20m) and the Hi-Band version (20–10m). I couldn’t be happier! JA1TLH/Taka

I took the PC Board for the QCXmini out of the plastic envelope and after inspection found that C39 had broken off, probably in transit. There was a CAP in the box, so I soldered it back in place. I am afraid, however, that C39 was damaged, since it appears to be missing the silver metal end on the right side. It may be that it is only the solder packed up agains the broken end and it is not making an electrical connection. I do not have any .1uF caps of similar size to replace. Should I continue with the build, and find out if it is broken when I finish the build? Or should I try to find another one before moving on? There are several imprints of other SMD components on the bag that the board came in, so I suspect the problem is that the board was backed too tightly in the box, rather than an assembly problem. Box arrived seemingly undamaged from MO. Thanks for your thoughts. Phil, K3UT

Hi all I updated the SSB beta testing webpage of the brave, here: https://qrp-labs.com/qmxp/ssbbeta.html and released firmware version 1_01_007 to it. This fixes one more typo I found in the USB compound device configuration. I carefully checked all 440 bytes one by one in all three configurations (1, 2 and 3 serial port). I believe in the 1-port configuration the configuration is byte for byte, identical to 1_00_027. Waiting for Ludwig to confirm any issues or not with WIn 7. I booted my PC into Windows 10 on the old HD and all three serial ports worked properly, and audio too. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

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.”