开云体育

I have a QMX coming soon and was wondering now that SSB is included, do you think the QMX would perform well in a mobile environment? Perhaps with a amplifier/tuner? TY! Jeff

Hello! I've noticed that SWR protection stops TX when I try to use QMX with one of my PA. When I measure SWR with connected PA threw QMX hardware test it shows 1.8-1.9. And it causes SWR protection actuation (even if SWR protection level is 3 or 4 by the way...). When I do SWR measurement with Nano VNA or another transceiver they measure SWR = 1.1. So it looks like QMX is incorrect. That is strange... When I do not use PA then QMX SWR measurement tool provides correct figures (compared with Nano VNA). Any ideas? BR/Sergey UB3AZK

Good Morning! I just finished building a QMX 60-15M kit that was shipped 2-April-2025, and found no CW output on 20 and 30M. Here is what I've measured and found: The gate voltage on Q509 (LPF 0 pin diode switch) is 3.3V for 60 and 40M bands and 0V on all others (normal). The gate voltage on Q511 (LPF 2 pin diode switch) is 3.3V for 17 and 15M bands and 0V on all others (normal). The gate voltage on Q510 (LPF 1 pin diode switch) is 0V on all bands (not normal, should be 3.3V for 30 and 20M). If I short the drain on Q510 on 20 and 30M, I get power out for those bands, so the pin diodes and LPF 1 are working. The gate to Q510 is has continuity to pin 36 (PB1) of the processor IC203. Resistance of all three gate pins to ground is about 30 megohms. None of the gates are shorted to each other. I've tried all three of the most recent firmware releases (1_02_000, 1_01_007, and 1_00_027) with the same result. I've tried a factory reset. The Hardware Tests/Diagnostics for Transmit on 30 and 20M show high Bias SMPS currents of around 61 mA, and no TX power out. All bias currents on other bands are normal at 30 mA. Any suggestions for further testing, a different conclusion, or where to go from here would be greatly appreciated. Also, does anyone know of a way to test the ports on this processor? Thanks in advance, and 73, Gil, AA9FT

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

Hi all I have a qmx plus and I ran 13.6 volts into it on a first time power up it worked for abt 5 min then it shut dow. Then i read about the max of 12v vcc. I am assuming that I lost the buck converter. I have replaced all the sbject transitors that showed bad via the ohm meter still no joy. does anyone of you smart ones have test point diagram fot the buck converter so i can trace it and trouble shoot . thanks you a bunch Joe

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