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All,?

Ive loaded.004 and it seems to work well on my QMX 80-20. I’ve made a number of successful contacts on ssb. On my QMX 20-10 it has distorted audio after the update. I did a factory reset then calibrated. It was after this that the transmit audio is very distorted. I went back and changed the settings to the last known working numbers but it’s still distorted.

Can anyone tell me if the new .006 has helped this? I’m about to load it in both QMXs and the QMX+ and was wondering if it has helped?

Does a firmware update require a factory reset and calibration or leave it be?

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Thanks..

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Don N6NLX

Don,

On the QMX that has distorted audio, please turn off the 'phase predistortion' option in the SSB menu, and see if that corrects the distorted audio.? If it does, please look at the calibration phase error plots for each band, and see if any of them are incomplete, i.e. they don't go all the way on the x axis to ~2000 (9V build) or 2600 (12V build), and see if that is the band where you heard distorted audio.? This data may be helpful in understanding what is happening.

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v006 does have further changes to the calibration, so you may want to try to load _006 and re-do calibration, at least on any bands with incomplete plots.? But in general, I don't think you have to do a factory reset or update calibration when loading any of these new versions.

Stan KC7XE

Thank you Stan,

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I just loaded .006 and ran the calibration. This is on my QMX 20-10. I need to re-read the diagnostics page to get more familiar what I’m looking at. Overall everything looks better during calibration compared to earlier releases. 20 is still crazy like a lot of people are seeing.
I have tried the PrePhase setting without success. However, since .006 I’m able to get intelligible audio and it sounds pretty good but I have a constant whistle. I can eliminate it by turning the mic gain way down into the 40s but then the audio starts to sound distorted again. I’m also running the EQ. It doesn’t make a difference if it’s on or off. The whistle is still there. The mic gain is currently set to 59. Compression is set to 4. The whistle is on all bands. I don’t hear this on my 80-20 QMX.?

I don’t have the best test bench here. I’m using an ic 705 with the antenna disconnected and the the RF gain set to 1. The QMX is connected to an EFHW for 40 meters.?

Don.

On Fri, Apr 25, 2025 at 09:00 PM, Don wrote:

but I have a constant whistle. I can eliminate it by turning the mic gain way down into the 40s but then the audio starts to sound distorted again

This whistle sounds like it may be an acoustic feedback problem, perhaps with your mic and IC705 speaker.? Try with headphones on the IC705 and see if it goes away.? There are probably a few reasons this could happen on the high-band QMX but not the low-band one.

When you turn the mic gain way down, it would reduce/remove the feedback, but the noise-gating feature will start causing dropouts, garbling the audio.

Hopefully soon I’ll try it with a different radio. I have a G106 laying around I can use for testing.

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Don.

So today I tried the 20-10 QMX and am happy to report that there was no whistle in the transmit audio as was reported to me by other hams I was talking to. I was able to contact several hams on the other side of the country today on 10 meters. I asked each of them for an audio report and each told me the audio was fine. I was surprised to get 5-7 reports from a 3watt output.

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Thanks again for your help Stan.

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Don.