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New QCX Mini (20m) build and everything seems to be working except for the screen will go blank and/or display a mix of /'s and ?'s after the initial boot screen. Boot screen always displays both lines of text and then roughly half the time I get the random mix of ?//? on just the top line or a single black character on the top right. The other half of the time the screen displays the frequency on the top line and I'll get a few button presses before it again falls back to the ?/???? junk. Pushing any of the buttons updates the line but never goes back to anything other than a single black box or the junk characters. I've inspected the board pretty closely, re soldered pretty much everything on the board at this point, and checked continuity between the screen and IC2 pins which all seems to check out. I've also checked the voltage on all the screen pins with a multimeter and while they aren't exactly what is in the build guide they seem to be within the expected operating range. That about hits the limit of what I know to do for troubleshooting, any advice would be more than welcome.

The QCX was returned to me as "Not Working." I set it up on a 12vDC battery and dummy load. Then used a signal generator and found that the QCX was receiving a signal. Also, using another radio (FT-891) I transmitted and the 891 received the QCX signal. Next I put in on the osciliscope and found that the output was 1V peak to peak. At this point I checked Q1, Q2 and Q3. All were functioning properly. Here I began checking the IC's. The pins I did not list here are within specs. The ones listed were not. IC5 pin 5 (2.28 is actually showing 12v IC5 pin 8 11.67) is 2.55 IC6 pin 3 (1.63) is 2.66 IC6 pin 5 (1.55) is 11.67 IC6 pin 8 (11.67) is 2.66 IC7 pin 3 1.99) is 2.60 IC7 pin 5 (1.89) is 11.67 IC7 pin 8 (11.67) is 2.66 IC8 pin 3 (0.65) is 2.57 IC8 pin 5 (0.65) is 2.57 IC8 pin 8 (11.67) is 2.60 IC9 pin 3 (0.65) is 4.49 IC9 pin 5 (0.67) is 11.67 IC9 pin 8 (11.67) is 2.56 IC10 pin 5 (4.21) is 11.67 IC10 pin 6 (3.94) is 5.94 IC10 pin 8 (11.67) is 5.90 This is as far as I got. Sorry for the 1st email, Hans. I have torn the bicep in my left arm and probably took too many pain killer before I emailed.. Hi Hi Any help will be most appreciated... Thank You Ron Pearson KA5HZV

Gents, Just finished build of QMX+. Everything works perfectly from first power-up. Glad I watched Hans' video. The 6-layer board really does take a lot of heat to solder properly. Power is a little low - about 3W on most bands, compared to 4W from my QMX but that doesn't make much difference. One feature would be handy... I find that the QMX goes into SWR protection before my ATU10 has a chance to tune. I have to manually turn off protection when I want to tune a new antenna and/or band. How about when turning keyer speed to zero, in addition to going to straight key, set power to 50% and turn off SWR protection. 73, Glen W6GJB

Hans (and others who may know): On my QMX and QMX+, I have often wondered why the measured TX voltage, as shown in the Diagnostics page, always has a significant drop (about 1.5V) from the supply voltage. Looking at the schematic, it should have only the very small drop due to Q507. So (while answering someone else's question today) I measured the voltages at Q507 and ADC_PA with my DMM and oscilloscope, on my 12V QMX+ build, all measurements done at 7.074MHz. Diagnostic screen shows: - supply voltage 11.8V receive, 11.5V during TX - transmit voltage 0.4V receive, 9.8V during TX (the unexpected drop of 1.7V in TX voltage) DMM measurement shows: - supply voltage 11.84V receive, 11.48V during TX (measured at Q507 source terminal) - agrees well with QMX+ supply voltage measurement - transmit voltage 0.43V receive, 11.22V during TX (measured at Q507 drain terminal, a drop of 0.26V) - does NOT agree with QMX+ transmit voltage measurement - but is as expected from Q507 drop So it appears that measurement of TX voltage on QMX/QMX+ is not well calibrated. Could this be causing some of the problems seen in SSB calibration, etc? So I measured the voltage at ADC_PA with my DMM (at top of C529), in case it is helpful: - ADC_PA during diagnostic receive mode (off): 0.08V - ADC_PA during diagnostic transmit: 1.96V Using just the 47k/10k voltage divider ratio, this would equate to 9.2V (rather than the full 11.22 measured); hmmm, is this part of the problem? Or is there an expected additional resistance in the STM32 input that completes the voltage divider? Stan KC7XE

Hi all! I want to build a qmx with at least 40, 20, and 10m bands. This is not currently an official build and I was wondering if it is recommended or indorse by Hans. I know that it is possible and I am willing to give up other bands to have all three. Thanks!

Just finished my QMX+ and I have noticed 2 things: First the radio is deaf, I can here the standard background noise, but I can not hear any CW even though I am tuned to a frequency that I know has someone transmitting CW (I can hear them on my main radio.) Second issue ( I think they are related) is that as soon as I try to key up, the radio goes into safe mode. Everything else seems to be working good. Any thoughts on where to look or things to check. I do show an open between the center conductor of the BNC connector and ground. That is a far as I have gotten.

Meanwhile having some QCX mini, now also own a QMX. Unfortunately I experienced a mysterious issue while keying CW that I don't know from the QCX. Every once in a while the QMX keyer omits a dit or a dah. At first I thought of a contact problem of my morse key (BaMaTech) but on my WinKeyer it worked flawlessly. I tried several speeds but even at low speeds this issue was present. After some futher experimenting with some alternative configurations and with other morse keys I think this is a problem of the QMX. I have firmware 1_00_027. Any ideas? 73 de Michael, DF9TZ

Is the QMX itself in any way capable to negotiate the required voltage with the power bank PD? In other words is a 12V trigger cable required or not? I feel more comfy with a trigger cable as it steers away from any negotiating. 73 es dx

Assembled my QMX+ and it's working. I had a couple of issues related to enameled wire not making good connections that were resolved. I know it's working, I've made contacts on several bands successfully, including some decent DX, all on FT8. What bothers me is that the output power seems to jump around wildly. If I go to the diagnostics screen and key the transmitter, the Bias SMPS shows fluctuations in current that correspond to the fluctuations in the output power. The Duty cycle on the Bias SMPS always shows 0%, even as the current jumps around in the red. I suspect I've managed to damage one (or more) of the surface mount semiconductors. At least that's what my reading on the subject would seem to suggest. What I need is a test that can be done with a multi-meter that would shed some light on the problem. I can probably resurrect an oscilloscope if I need it, but I'm hoping someone can lead me to a simple voltage or resistance test that could help isolate the problem. My last problem was related to soldering and enameled wire which was easily resolved. I'm hoping this issue can be resolved without major surgery as well. Thanks in advance for all of the good advice I'm about to receive. Andy WB9YXA

Oh emm gee, I just ordered a QMX+ kit. Yay! I haven’t found a rundown on the specs for the current QMX/+. Does the new SSB firmware beta change anything for the sdr as a receiver? I am about 95% a listener, ham bands and not. I enjoy getting radiofax, so if anyone has done that please let me know how it does? Tnx es 73, Aunty Bee

The QCX was returned to me as "Not Working." I set it up on a 12vDC battery and dummy load. Then used a signal generator and found that the QCX was receiving a signal. Also, using another radio (FT-891) I transmitted and the 891 received the QCX signal. Next I put in on the osciliscope and found that the output was 1V peak to peak. At this point I checked Q1, Q2 and Q3. All were functioning properly. Here I began checking the IC's. The pins I did not list here are within specs. The ones listed were not. IC5 pin 5 (2.28) is actually showing 12v IC5 pin 8 (11.67) is 2.55 IC6 pin 3 (1.63) is 2.66 IC6 pin 5 (1.55) is 11.67 IC6 pin 8 (11.67) is 2.66 IC7 pin 3 1.99) is 2.60 IC7 pin 5 (1.89) is 11.67 IC7 pin 8 (11.67) is 2.66 IC8 pin 3 (0.65) is 2.57 IC8 pin 5 (0.65) is 2.57 IC8 pin 8 (11.67) is 2.60 IC9 pin 3 (0.65) is 4.49 IC9 pin 5 (0.67) is 11.67 IC9 pin 8 (11.67) is 2.56 IC10 pin 5 (4.21) is 11.67 IC10 pin 6 (3.94) is 5.94 IC10 pin 8 (11.67) is 5.90 This is as far as I got. Sorry for the 1st email. I have torn the bicep in my left arm and probably took too many pain killer before I emailed.. Hi Hi Your help will be most appreciated... Thank You Ron Pearson KA5HZV

2.6 on my Win 10 machine receives great with new QMX Plus but can’t get it past a hamlib error. Tried it with QDX that worked fine some months ago and it does the same error. Tried to download but link to Princeton.edu is broke. Looks as though only site is SourceForge. That requires some registration and other manipulation. That safe place for download or is there other programs for FT-8? Think I still have WSJT-X on a Linux machine but I’m not so good Linux. Just an old guy who started life with tubes but love this new fangled stuff! 72/73 Jim w0nkn

I’ve had my QCX+ up and running for a couple of weeks now at home, and have made many QRP qso’s on it and a OCFD. I find the hobby so rewarding using a new language I learned recently, and using a rig that I built! Thanks goes out to QRP Labs for great kits! Anyone can build these kits with patience and a hot iron…if I can, you can! Can’t wait to get outside here in Northern Minnesota with the QMX, Spring is just springing up here. Thanks Hans! 72/73 -- Trevor (N0YMA)

Shout out to Jeffrey Moore W1NC for the excellent service and quick turnaround on my problematic QMX build. He has it up and running and fixed all my build problems. Lessons learned. I can't say enough about how delighted I am. I didn't want to have to attempt to build a second kit to correct my mistakes. He had found my soldering issues plus replaced the blown CPU. I am looking forward to my first CW contact with 5W on this machine. Bill Buck, KJ5IVB

Hooked up power, speaker, paddles and antenna. Powered it up, looked for and found the VOX and turned that on, looked for and found how to change from straight key to paddle, changed speed to 17 wpm, and we’re off to the races. 4.5 watts out on 40 meters with the 9V Bioenneo (9V build). What a blast. Worked N2TTL in Florida and was spotted by Germany from one of my CQ’s. I have not even opened the PDF for the manual, although I have downloaded it. So far, everything I have needed to change has been discovered by scrolling through the menus. Hans, you’re a genius. The user interface is fabulous and intuitive. I’m no rocket scientist…I am an engineer. And if I can get the hang of this without opening the manual, then you did it right! THANK YOU!! Mark Lunday, WD4ELG Greensboro, NC FM06be wd4elg@... http://wd4elg.blogspot.com SKCC #16439 FISTS #17972 QRP ARCI #16497