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Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Hi Hans,
?
Yep, that did cross my mind..
?
In fact my first attempt was to use a PC gaming headset with mic. The audio gain was very low from the headset compared to the electret mic's I found in my junk box.
?
These electrets seemed to work quite well on my PC. I would have thought they would work equally as well on the QMX...
?
I forgot the mention, I also removed an electret mic from a Baofeng speaker mic to use on the QMX. That gave the same results as the other electret mic's.
?
Could you remind me of the mic that you used please?
?
Cheers.
?
Mel. M0KMD
Re: Very simple QMX software request

 

OR...one could switch to their trusty Yaesu FT-450D, as I do, during antenna "tuning" :0)
72,
Bill, N4QA/4/QRP Oak Island ( OKI ), North Carolina, U.S.A.
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Did you leave predistortion off during calibration?
?
Let me give that a go..
?
Cheers,
?
Mel. M0KMD
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Yep, done that one. I was using headphones on the IC 7300 whilst testing TX on QMX.
?
Cheers.
?
Mel, M0KMD
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Hi Mel

It's possible the microphone isn't sensitive enough. Turning up the gain increases the audio but also the noise (if the mic SNR isn't enough)

73 Hans G0UPL


On Thu, Mar 27, 2025, 13:23 Mehmet Dinch via <msdinch=[email protected]> wrote:
Well, I bit the bullet and installed the 003 FW.
Update of FW went all fine, no issue there.
I wired up a electret mic I found in my junk box.
Tested the mic on pc and sounded fine.
I made an adapter using the electret mic and a foot switch for ptt.
The Mic and ppt switch works. But...
Testing SSB TX with QMX on dummy load and listening on my ICOM 7300, the audio is badly distorted before calibration and even worse post calibration. So much so that the speech is unintelligible.
The audio sounds like the QMX is only picking up the peak signals from my voice.
Most of the calibration plots look nothing like the example ones from the release notes. And only a few mildly resemble the examples.
Adjusting mic gain to about 70 seems to improve the audio. However, every time I key up,? there is now an awful lot of noise before I even start speaking. Once I start speaking the audio is ok'ish with a load of background noise.
I tried messing about with other SSB settings with no improvements.
I did find a second electret mic that gave me similar results.
I have now set it back to factory default and seeking advice.
Any suggestions?
?
Mel. M0KMD.
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Make sure you are not getting feedback between QMX and IC7300. I had lots of feedback and distortion until I backed the audio way down on my receiving QMX+. I made two QSOs with good signal reports.

Mike Krieger


On Thu, Mar 27, 2025 at 6:23?AM Mehmet Dinch via <msdinch=[email protected]> wrote:
Well, I bit the bullet and installed the 003 FW.
Update of FW went all fine, no issue there.
I wired up a electret mic I found in my junk box.
Tested the mic on pc and sounded fine.
I made an adapter using the electret mic and a foot switch for ptt.
The Mic and ppt switch works. But...
Testing SSB TX with QMX on dummy load and listening on my ICOM 7300, the audio is badly distorted before calibration and even worse post calibration. So much so that the speech is unintelligible.
The audio sounds like the QMX is only picking up the peak signals from my voice.
Most of the calibration plots look nothing like the example ones from the release notes. And only a few mildly resemble the examples.
Adjusting mic gain to about 70 seems to improve the audio. However, every time I key up,? there is now an awful lot of noise before I even start speaking. Once I start speaking the audio is ok'ish with a load of background noise.
I tried messing about with other SSB settings with no improvements.
I did find a second electret mic that gave me similar results.
I have now set it back to factory default and seeking advice.
Any suggestions?
?
Mel. M0KMD.
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

HI Mel,
?
See my earlier message with a similar issue.
?
I had that distortion and then turned off predistortion etc. and it improved.
I re-ran the calibration and then is was OK ( for a bit ) and now have distortion again.
?
I don't have time to perform more rigorous testing/recording conditions, but I will post again when I do.
?
72 Simon G0FOZ
Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Stan,
mine has done that since 001, depending on what menu you have visited before you exit out.?
--
73, Dan - W2DLC
SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Well, I bit the bullet and installed the 003 FW.
Update of FW went all fine, no issue there.
I wired up a electret mic I found in my junk box.
Tested the mic on pc and sounded fine.
I made an adapter using the electret mic and a foot switch for ptt.
The Mic and ppt switch works. But...
Testing SSB TX with QMX on dummy load and listening on my ICOM 7300, the audio is badly distorted before calibration and even worse post calibration. So much so that the speech is unintelligible.
The audio sounds like the QMX is only picking up the peak signals from my voice.
Most of the calibration plots look nothing like the example ones from the release notes. And only a few mildly resemble the examples.
Adjusting mic gain to about 70 seems to improve the audio. However, every time I key up,? there is now an awful lot of noise before I even start speaking. Once I start speaking the audio is ok'ish with a load of background noise.
I tried messing about with other SSB settings with no improvements.
I did find a second electret mic that gave me similar results.
I have now set it back to factory default and seeking advice.
Any suggestions?
?
Mel. M0KMD.
Re: mic test doesn't scroll up

 

I am having the same issue with screen on a Mac. I worked around this by using the microphone calibration from the menu on the LCD screen.?

--
Karl Heinz - K5KHK
Re: QMX+: quick exit from menu system?

 

开云体育

+1 for that!!
?
Bill
W2EB
East Syracuse, NY

On 3/27/2025 at 3:29 AM, Hans Summers via groups.io <hans.summers@...> wrote:

Hi Bruce

Good idea, I can add that no problem. I suggest use of the normal exit button... But a long press to get all the way out of the menu, compared to the normal many-presses to come up one level at a time.

73 Hans G0UPL


On Wed, Mar 26, 2025, 23:32 Bruce K1FFX via <rosen.bruce=[email protected]> wrote:
Hi, all -
?
Is there by any chance a button push to exit from the menu system back to
the operational frequency display, i.e., without having to do multiple EXITs to
navigate up and out?
?
[I think the answer is "no", but thought I'd ask anyway.? If so, I'd like to suggest
something like "long press of the MENU button while in the menu system will
exit the menu system" ... very low priority, of course!]
?
Thanks -
?
Bruce K1FFX
?
Re: Very simple QMX software request

 

My preference would be that instead of shutting the power off a high SWR would switch to the Tune power, then when the SWR improves the power is restored (ideally after a delay).? This avoids the need to do something other than using the tuner to get a low SWR while still keeping the QMX safe.
?
This may be a bit more work but would make operating using a tuner much easier.
?
Chris, G5CTH
Re: mic test doesn't scroll up

 

On Wed, Mar 26, 2025 at 12:57 AM, Dave Koberstein wrote:
When running the mic test I get the bottom row. However, it does not scroll up. So I don't see the history covered on the beta firmware page.
I have the same problem.? Settings for one mic seemed OK but I changed mic and it worked OK for a recent SOTA - no unfavourable comments on audio quality.? New mic on the way so I will repeat the test when that is ready for use.
Using Putty on Win11.
Rod
Re: QMX+ T507

 

I'm building a QMX+ and will get to that stage in a day or two but I really doubt that the PCB wiring is incorrect.? I checked some of the connections round T507 and it seems fine.
I've always considered that the wiring instructions for T507 to be totally clear - wind the two transformers one on each side of the binocular core and connect using the holes that seem obvious but people do seem to have the ability to misinterpret this.
?
T507 is wired as two separate 10:1 transformers, one through the upper hole of the binocular core, the other through the lower hole.
Holding the board with the RF output in the lower right corner the T507 connections are two vertical rows of 4 holes just to the left of the RF BNC:
  • The top pair of holes are used for the ends of the upper 10 turns of the upper transformer.
  • The upper centre pair of holes are used for the 1 turn wire for the upper transformer, this comes straight from the upper centre left hole to the upper centre right hole, through the upper hole of T507.
  • The lower centre pair of holes are used for the 1 'turn' wire for the lower transformer, this comes straight from the lower centre left hole to the lower centre right hole, through the lower hole of T507.
  • The bottom pair of holes are used for the ends of the lower 10 turns of the lower transformer.
?
Hope that helps, if you have a problem then photos showing exactly what you have done will be useful.
?
Chris, G5CTH
Re: QMX+ Strange Audio Artifact - Help, Please...

 

On Wed, Mar 26, 2025 at 10:21 PM, Jeffrey W Moore wrote:
I use this from DigiKey:
399-4701-1-ND
?
The corresponding Mouser number is: 80-T495D477K006E100
Re: QMX+: quick exit from menu system?

 

Hi Bruce

Good idea, I can add that no problem. I suggest use of the normal exit button... But a long press to get all the way out of the menu, compared to the normal many-presses to come up one level at a time.

73 Hans G0UPL


On Wed, Mar 26, 2025, 23:32 Bruce K1FFX via <rosen.bruce=[email protected]> wrote:
Hi, all -
?
Is there by any chance a button push to exit from the menu system back to
the operational frequency display, i.e., without having to do multiple EXITs to
navigate up and out?
?
[I think the answer is "no", but thought I'd ask anyway.? If so, I'd like to suggest
something like "long press of the MENU button while in the menu system will
exit the menu system" ... very low priority, of course!]
?
Thanks -
?
Bruce K1FFX
?
Re: Very simple QMX software request

 

Hi Sverre?

Yes no problem, I can add that to my list... Flashing S?

73 Hans G0UPL


On Thu, Mar 27, 2025, 02:09 Sverre Holm via <svholm54=[email protected]> wrote:
In operating the QMX+ with a non-resonant antenna and a manual tuner, it is unavoidable not to get the 'S' in the display to the right of the frequency from time to time. The 'S' just looks like some feature which has been turned on, but one quickly learns that it is an error message since the transmitter has shut down due to high SWR. By the way this is a very nice feature compared to e.g. the QDX and it has probably saved a lot of BS170's already.
?
But my wish is that the 'S' could be made more visible - for instance that it would blink on and off - thus alerting the operator that something is wrong.
?
?
--
Sverre

LA3ZA
Re: Possible QMX TX/RX switching race condition? #qmx #receiver #smoke

 

Hello Greg

As far as I'm aware there isn't any race condition. Something else must be at fault here. The TX line is deactivated and after some short delay, RX is activated. And vice versa on key down.?

73 Hans G0UPL


On Wed, Mar 26, 2025, 16:51 N1TR via <gregoryjz=[email protected]> wrote:
I believe this is a question specifically for Hans :)
?
Having recently had the receiver mux chips be destroyed seemingly without any other failure of the switching circuit controlled by Q508, I'm wondering if there is a potential race condition such that the transmitter "switch on" code may be reachable without the receive switch pin on the microcontroller being pulled low.
?
I assume that transmit is almost certainly gated behind a command changing that pin state, but I'm wondering if there's a machine code level race condition that would let the transmitter operate without that pin being guaranteed pulled low?
?
Just a thought, as this seems like a strange failure mode.
?
Greg
N1TR?
Re: QMX+ T507

 

The wiring is correct in the assembly manual.
It is not uncommon to forget to install the jumper in JP501 (shown in the diagram at the bottom of pg 36), which connects the BNC to T507 output.
It is also not uncommon to have soldering issues installing T507, making sure the enamel is fully cleaned from the windings for a good connection.
Stan KC7XE
Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

One new quirk I found on 1_01_003:
In the terminal interface, when you exit from the Diagnostics screen, it now changes the band in the QMX VFO, rather than leaving it set to whatever it was before entering Diagnostics.
Stan KC7XE
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