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A puzzle resolved? I tried various bands and modes, but I failed to enable my QMX+ Tune SWR function for more than 1 second, far less than this old duffer could work an "antenna tuner" in his best days. Hans, in a You Tube video, shows how that function works in the QMX, continuously keying tx and showing the resulting SWR, for up to 1 minute; sufficient time for this Ol Geezer to "tune er up". Being slow in the head, and getting no better, after a couple of days I "discovered" that with my QMX+ connected to a PC, connected to WSJT, the Tune SWR only keys up my QMX+ for 1 second and does not time out after 1 minute. When WSJT-X is closed, the function works as advertised... Now, happy old dog. Da Ol' Dog/wa4hei

Hello, I have a QMX that is built for 9V. Now I'm making a custom LiFePO4 battery for it. My question is, what's the maximum input voltage that the QMX can handle before it breaks? Given that each LiFePO4 has around 3.55V, if I connect three of them in series, I'll get around 10.65V, is that going to damage the radio? Thanks, Sepehr N6IRN

Has anyone else seen an issue where the receive audio stays on during transmit? I noticed it today. It happened on all bands and when I key the mic the receiver audio doesn’t blank. It’s not receiving but just a hiss like listening to a dead band. Im able to receive fine. I was able to make ssb contacts too. I figured it was my powered speaker but I switched it to my QMX+ and it works fine. Anyone? Don.

After months, even years of thinking I eventually ordered another QRP Labs kit today: a QCX+. I had previously built a QDX Hi Band and am satisfied with it. I followed closely the development of the QMX and thought to buy a 60M to 15M model then followed the development of the QMX+. I read a lot of comments about the problems experienced by some builders and as I'm 80 years old, with bad eyesight and rather shaky hands and considering my former experience to build my QDX then modify its T1 transformer and replace the BS170 I finally thought that such tiny technology was not anymore for me. I will build my 20M QCX+ with dev-board, TCXO and AGC cards. With the dev-board I plan to experiment with internal LiFePo4 batteries, audio amp with speaker and why not do something with the IQ signal ahead of the CW filter to decode in Rx SSB and AM. Another reason for my choice of the QCX+ is that it is very robust and there are no SMD components, only through-hole components, something I have been used to deal with since the year 1959 with my first regenerative receiver built with vacuum tubes then many Heathkit units. 73 - Pierre - FK8IH

I just applied power, 7v, limited to 250ma. I long pressed the left rotor encoder. When power jack is first inserted there is no current. After power is turned on, current is 40ma. The QMX does not mount as a drive in Ubuntu so I cannot install firmware. I am depressed. I had hoped to demonstrate this unit to Scouts in July. What are my next steps? Thanks for your help.

Bill, N4QA/QRP <wb4hio@...> updated the photo album QMX-PLUS-FT8-OKI : QMX-PLUS-FT8-OKI

Bill, N4QA/QRP <wb4hio@...> added the photo album QMX-PLUS-FT8-OKI : QMX-PLUS-FT8-OKI

I just finished playing in the CQ World Wide SSB contest! My setup included the QMX+ (firmware 1_01_003) and a 3-el yagi at 15 metres above ground. The QMX+ performed beautifully. I made 118 contacts on 3 bands. Worked 32 different DXCC Entities in NA, SA, Eu, Asia and Africa. My final claimed score is 29,952. All this with 3 watts or less! I had lots of fun! Thanks Hans! -- 73, Rick VE7TK Website: https://www.ve7tk.ca/

New broken QMX+, need repairhelp in Sweden. Regards Roger SM7RYR Contact: sm7ryr@...

I was just building a microphone for the qmx and then I plugged it into my power supply to test it. I on purpose to turn the voltage down from 13.8 and then turn it on. It worked fine but I needed to turn it off and back on again for it to connect to my computer. I turned it off and then when I tried to turn it back on it was a high-pitched noise for about half a second in the screen backlight turned on and then it turned off and now shows no signs of Life except power draw when I press the button.

Hello, I tested the internal microphone in the menu microphone test. Nice. Now a question: once the beta firmware results in a release, what will be the way to transmit? All controls seem to have already a function and there seems to be nothing left for the PTT function. Jindra

I just finished building a QDX board version 3 with the latest 1.10 firmware installed and have been testing it. I built it for 9v operation and am using a variable bench power supply to test it. I have made a few FT8 QSOs on both 40m and 20m, I am noticing the power starts out at about 4w and slowly drops to about 2w by the end of the FT8 transmission cycle. The voltage from the power supply is a rock solid 9v. The current draw on transmit starts at about 1.02 amps and drops to about .4 - .5 amps by the end of the transmission cycle. Is this normal and if not, what should I be looking at? 73 Doug WB5WRC

Or should I wait to see what's coming out at Dayton that will be even more amazing? But then I won't have time to get it ready for Field Day. Decisions, decisions.

I know it's been a Han's project for many years, with many "interruptions", such as SSB on the QMX+!!! Anyway, I recall that at one time, Han's had the vision/plans for a QMX++ (I forget it's real name), that was to be an upgraded QMX+ with a color display, larger case, etc. Does anyone remember the name of this (hopefully) future radio? At last years' FDIM, when I spoke to Hans about the different radios, I nicknamed them the QMX-lite, QMX-home-edition, and QMX-Pro-edition. I recall he said his current priority was SSB (bravo, Hans!!) and that all of the QMX series radios would use the same firmware, etc. No, I AM NOT COMPLAINING, I am just trying to remember the name of the color display enhanced radio, along with the latest WAG on availability. Thanks, Roy K2RMA

Hello to all, is there a hardware reset for the QMX? THANKS

Hi all, I have an unbuilt 50-watt amp kit and I'm trying to figure out how to best build it. I just completed a 5-band (40-15 meters) homebrew rig (it's not a QMX, but it works!). I'd like to use the amp on multiple bands for this radio (and possibly a QMX). I am thinking of just building the amp for the highest band I need and adding a switchable external low-pass filter. But I had a question: obviously the output of the amp won't be as large on higher bands. However, if I build the amp for 15 meters and transmit on say 40 meters (with a 40 meter external low-pass filter) should I still similar output as I would get if I built the amp for 40 meters, or would there be a significant sacrifice running though the 15 meter filter first? I'm sure some of you have experience trying this out. Thank you! 72, Sam WN5C

Hi all, Next monday, March 31 is the next QCX Challenge, on the regular bands. Times are 1300Z, 1900Z and 0300Z (Tuesday). Time to get on the air with your QCX, QDX or QMX rigs! Use any accepted mode where you can exchange a signal report, your name, rig and power. Note that from now on, this means that also SSB can be used by those that have a QMX/QMX+ with the new firmware :-) See all info here : https://www.qrp-labs.com/party.html Enter your scores at https://3830scores.com/ Join the discord page in the #qcx-qrp-operation channel to post your QRG or exchange other info, or just have a chat with other QRP Labs friends ... https://discord.com/invite/GdZzmhuU8p Also check out the spotting website by Tom,DK3DUA : https://www.hamserver.de/qcxparty.php PS : note that from now on, the QCX WARC Party has moved to the second monday of the month, so the next one is on April 14. 73 es GL, Luc ON7DQ

Hello, I am testing ARIM + ARDOP between QMX+dummy load and TS590+normal antenna. I can hear both signals both ways very well. ARDOP listening to QMX can decode all frames. ARDOP on TS590 cannot receive a single frame sent via QMX. QMX mode is set to DIGI. I think I should rather use USB, right? Jindra