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.?

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73 de angelo i1jck

1_01_004 - menu item history fix would be very helpful

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With the addition of new items under 'Hardware tests' in the menu, we can now no longer just click twice on the menu button to get to the Tune SWR menu (after using it once).? The 'Hardware tests' selection is remembered, but not the next level down in the menu.? So now it will always go to 'AF filter sweep' (not very often used), and you have to turn the knob to get to 'Tune SWR'.? It would be very nice for QMX to remember the last function used at least one more level down in the menu tree.

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Similar behavior happens for selecting a CW filter bandwidth - now that the settings are grouped under the new 'CW' section, it does not remember that the last setting I chose was 'CW passband', making it a bit more trouble to change the CW filter.?

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Stan KC7XE

Awesome! Thank you!

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73 Michael N6QP
Up in Thin R

Menu -> Hardware tests -> Tune SWR

from pg 56 of the operations manual:

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SWR measurement
The SWR measurement tool enables the transmitter at a reduced supply voltage determined by
the operating percentage defined in the Tune % parameter of the Protection menu. This
percentage is displayed for information on the top right of the screen.
The top left shows the operating frequency for the SWR measurement, which is the center
frequency of the band.
The band name is displayed in the bottom left, and SWR measurement in the bottom right. The
SWR measurement is updated ten times per second.
Controls:
? Use the left rotary encoder to change the band.
? Use the right rotary encoder to change the frequency.
? Start the SWR measurement by pressing the left push button (Keyer/RIT/Menu). The SWR
will continue to be displayed until the SWR measurement tool is closed, or the left push
button is pressed again, or the rotary encoder is turned to change the band, or a 60 second
timeout expires.
? Use the right push button to exit the SWR measurement tool.

How do you get to Tune/SWR mode? I don't find it in the manual.

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73 Michael N6QP
Up in Thin R

Nice! QMX to QMX. That’s cool.

Did you try tuning using the Tune/SWR mode?? In that mode, QMX uses reduced power and turns off the swr protection. That may work with your LDG tuner.

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.?

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Im too old to build and am looking for something retail I can get.?

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Any suggestions??

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--

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Charlie C. ?- K2CMC

LICW/SKCC/NAQCC?

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 worse, intermittently connected, all of the rapid tx/rx cycles during calibration stressed Q508 until it broke (likely shorted D-S).? [Perhaps this broke IC402, also, since failures there were the reason D516 was added.]

b) With a shorted (always on) Q508, there is an unexpected load during transmit put on the output of T501 and hence the PA transistors; akin to having a high swr.? They responded by failing during the full power parts of the calibration.

c) Failed PA transistors can overload Q507 and/or IC503, causing one or both of those to fail.? We can hope that didn't happen.

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So do check Q508 before powering up with new PA transistors.

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This failure theory would have happened independently of firmware if you operated CW with its full break-in, over perhaps an extended period; or at least doing so would have stressed Q508 such that it broke during calibration.

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Stan KC7XE

On Thu, Apr 24, 2025 at 11:33 PM, Wiggle Pig wrote:

D516 wasn’t soldered on correctly at the cathode.

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.

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73 Ludwig

On Thu, Apr 24, 2025 at 04:15 PM, Ian Beeby wrote:

If you’re running anything pre-Windows 10 which is connected to the internet you’re really asking for trouble.

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 whole amount of my life. Often only to get something I had before before I was forced to switch to an other OS or version. And now I don't want to go to a parallel OS universe.

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73 Ludwig

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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 notes on the original post.? I disconnected the radio from power and attempted to reproduce, but the test ran fine the second attempt.? I have not be able to reproduce it, but I suspect it might be related to immediately running the test post firmware update?

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 can check that but hopefully Q507 is OK as I haven’t got a spare for that one at the moment!

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Thank you so much for the info, hopefully I can get this unit back in working order soon…I’m really miffed that I popped it as I haven’t had it long and really like it! All that aside I’m quite perplexed why this has happened as I wasn’t doing anything untoward to it; I had the supply at 10V and was running a calibration into a decent dummy load when it occurred, although when I removed it from the case I noticed that D516 wasn’t soldered on correctly at the cathode. ??♂?

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homhum. Thanks for the information though. ?

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73

Piggly

Ups, I should have mentioned: I got the USB failures with a High-Band QMX, not QMX+

But in theory that shouldn't matter...

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-Tobias

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Ah, you beat me to the post there Stan.?