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Is there a manual tuner that ppl use with the QMX+ - I tried using my LDG Z817 and it seems to go into protective mode for final. too high swr. Im too old to build and am looking for something retail

I took my QMX to Mt. Porepunkah in North Eastern Victoria for some SOTA and worked another QMX on the North Island of New Zealand on 20m (ZL1HIM). Clear audio both ways. Cheers Glenn VK3YY.

Yes, what Ludwig recommends is important.? A failed Q508 could be the cause of the problems, with D516 being the trigger. Here is one theory of what happened: a) With D516 either not connected, or

You should check Q508 in RX and TX mode (voltage at S, D and G). To cut the high current lift a leg of L502. A broken Q508 could be a dangerous load for the PA and may affect the RX path. 73 Ludwig

One thing I have seen is that windows will install a new physical com port with the same port number as a virtual port I have defined with vspMgr. My solution was to delete the virtual port with

Thanks for your warning Ian. Don't worry, why should I connect my field operation computer to the internet? In my life I had to deal with at least 13 OS and version of OS (not only MS). It took me a

Interesting. I am running the same OS build here with no USB related issues on my QMX+. I have been running two COM ports to the QMX+ for the past several hours without a

Thank you, Tobias. Makes me feel a bit better not being in left field, alone. 73 Dick, K5AND Sent: Thursday, April 24, 2025 3:47 PM To: [email protected] Subject: Re: [QRPLabs] #qmx SSB Firmware

Immediately after the firmware update, I ran PA mod. test: And then attempt to run DAC error vs phase on 20m.? It generated an error that would not let me run the test like what is noted in the

Aha, many thanks for this. i can’t really test that or look in the menus at the moment as the draw when powered up n receive is quite high through the PA. Once I take out the PA transistors then I

Ups, I should have mentioned: I got the USB failures with a High-Band QMX, not QMX+ But in theory that shouldn't matter... -Tobias

Ah, you beat me to the post there Stan.

I believe that Q507 is switched on during receive, however if you go to the diagnostic screen in terminal it is switched off and only switches on when in TX. ?I haven’t got either of mine in bits

Yes, the tx voltage is on during receive, and will be very close to the supply voltage. Hans has given a good description of why this is done; it helps receive work better. It is turned off when

*FYI - Complete USB failure on two different machines running Windows 11 Pro* One Ryzen 7 5800X machine with 32GB Ram One 11th Gen Intel(R) Core(TM) i5-1135G7 with 16 GB Ram Edition ? ?Windows 11

Chris, I've never used the Winlink auto-connect feature.? You will need to ask this question in a Winlink forum; it is independent of VARA and radio (QMX). Stan KC7XE

Hello Ludwig and Hans, because I have planed a SOTA activation and my power supply has no current limit, I didn't want to risk with the check before that. Nothing was visible damaged or burned. After

Evening all I have a question regarding the operation of the power control around the PA transistors…does the DAC drive Q512-5 and therefore Q507 when the unit is in receive, meaning the PA supply

If I have done a successful calibration with 1.01.003 that I shouldn't have to recalibrate if upgrading to this new version?

Here is a link to a YouTube video on testing the 50-watt amp: https://www.youtube.com/watch?v=rUVLphjKaFQ&t=28s 73 Evan AC9TU