开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. QRPLabs
  2. Topics

#qmx #SSB Firmware beta 1_01_002 release #qmx #ssb

 

Hi Stan
Thank you for the quick reply.? I bypassed the LVDO but it made no difference.? But I will try another source.? Thanks...
 

On Fri, Mar 28, 2025 at 11:01 PM, Greg Walsh wrote:
After installing an outboard LVDO voltage regulator (ND6T circuit) my QMX+ boots up to show "Initializing: Audio system" and doesn't respond any further
I would first try a different power source.? Maybe something in your new LVDO is limiting the current such that QMX+ can't complete its startup.
 

Hi
After installing an outboard LVDO voltage regulator (ND6T circuit) my QMX+ boots up to show "Initializing: Audio system" and doesn't respond any further.? Putty doesn't respond either.
I have used the 'forcing update method using wire jumpers' which allows me to reinstall the firmware but to no avail.? The QMX+ just reboots to the "Initializing Audio system" screen and goes no further.? I have installed an earlier version of the firmware 026, which installs ok but still just goes to the "initializing audio" screen.? I have also reinstalled the new 003 firmware but just the same problem.
If I remove power and press the right button before powering up, the first screen shows "Initializing: Setup EEPROM" before moving on to the "Initializing audio" screen and locking there.
I have checked the input voltage at 11.5V but I can't check much else.
Can anyone offer some advice on how to proceed from here please.? The QMX+ was working fine with the SSB upgrade until this happened.
Regards
Greg
ZL4GW
 

On Tue, Mar 25, 2025 at 12:30 AM, <rentwist@...> wrote:
I’ll have to look at phase predistortion, it is currently whatever default is, on I assume?
ON is default.
 

Yes, checked 80m also and it looks the same.
?
I’ll have to look at phase predistortion, it is currently whatever default is, on I assume?
?
73,
?
Robert, WA2T
 

Robert,
?
did you test also other bands? Looking at your 40 m spectrum the signal outside the SSB chanel is only 15 ... 20 dB below the peak in the channel (around 7.152). Did you check the spectrum with Phase predistortion ON and OFF? Is there a difference?
?
73 Ludwig
 

Question for Hans,
?
Have you seen anything like the spectrum I (and Jim) posted?? During my regular weekly QSO with a friend about 170 miles away, while he was able to copy me and it did not sound bad (still trying to get the sound bite he recorded of my transmission), he was able to corroborate that I was producing RF up and down from my Fc that he could see on his SDR SW (he runs PowerSDR).
?
I am going to try a couple of different mic's (QRP Guys and Adam Kimmerly's which are on the way to me) and redo calibration but wondering if the issue will persist.? I tried using both a (connector modified) Icom HM-12 and a Behringer XM-8500 with poor results (as spectrum pic I posted previously shows).
?
Also, no one replied regarding calibration with or without a mic plugged in.? From the beta page one might infer that with a mic plugged in would be correct as the calibration section follows the mic drive setup section.? It is not explicitly stated and wanted to ask to be sure.? So, mic or no mic during calibration (or does it even matter)?
?
Thanks and 73,
?
Robert, WA2T
 

On Thu, Mar 20, 2025 at 08:12 PM, John Olsavicky wrote:
I installed Firmware beta 1_01_002 on my high band QMX. In putty I started Optimization and after less then a minute putty became unresponsive. I exited putty and disconnected power from the QMX. I powered up the QMX and it stopped with the message "Initializing Audio System" then it shut down. Any thoughts on what I broke?
?
Well this mystery is solved. I had shorted the leads from one of the BS170 finals nearest to the slot that the PCB slides into. Fortunately, the only damage was to that final so I replaced it and the QMX booted right up. I was able to run the optimization again with no problems.?
?
KC3PBY - John
 

I am however getting good audio reports hunting POTA stations.
?
Jim
AC9YY
 

I am running 1_01_003 and see similar signals extending well beyond my base frequency, maybe a couple of 100 KHz on my TinySA as well. I am using 60 DB of attenuation into the TinySA. It seems like the IMD goes much further bandwidth wise than other transceivers I have worked with.?
?
Jim
AC9YY
 

On Sat, Mar 22, 2025 at 06:45 AM, <rentwist@...> wrote:
the XM8500 is a dynamic mic
A dynamic mic is not well suited to QMX, unless you modify QMX internally.
This is because a dynamic mic has an impedance of about 300-600 ohms, and the QMX is expecting a high-impedance microphone, 2.2K? ohms or greater.
So you can't get good performance from a dynamic mic on QMX.
Stan KC7XE
 

Hi GL and Group,
?
Today I tried the QMX in a regular QSO I have weekly.? There seems to be fairly loud "noise", something like impulse noise I'd call it.? My QSO partner said it was something like me TX'ing while running a vacuum cleaner and trying to talk over it.? I don't think he was saying it sounded like a vacuum cleaner but that was the analogy.
?
My mic gain is set to 75 using a Behringer XM8500.? When I tried 43 as GL is using, I found it to be not enough to get any decent amount of mic audio.? In fact, even at a setting of 75, I'd say there is not an abundance of mic audio.? Being that the XM8500 is a dynamic mic, I don't need mic bias so it is not that.? Not sure if the QMX has mic bias capability but it should not be a factor here.
?
I have asked my buddy for a recording he made of my received audio, I will post it if he has and sends it.
?
I wonder if my calibration has an issue.? Is a mic supposed to be connected when calibration is performed or no mic?
?
73,
?
Robert, WA2T
 

开云体育

I had this too, I just had to press the PTT and that's what I saw on the Monitor rig. Turned out to be too much Mic Gain. My setting is now 43.
?
GL
?
G4GIR
?

----- Original Message -----
From: rentwist via groups.io <rentwist@...>
Reply-To: <[email protected]>
Sent: 21/03/2025 20:51:25
Subject: Re: [QRPLabs] #qmx #SSB Firmware beta 1_01_002 release
Hi Group,
?
I took the plunge today and installed the second SSB beta FW on my 80-20m QMX.? Did the calibration and tried it out.? While I do hear myself well on my nearby Flex 6400M with no antenna, I also hear a fairly high pitched tone and the spectrum (outside of the TX voice passband) looks like "long, slow downhill slopes" if you will.? See picture below of 6400M spectrum/waterfall.? At first I thought it was the mic(s) I was trying, but then thought to try my Behringer XM8500 with the proper wiring to the QMX Paddle input.? Seeing the same thing on all mic's.
?
Is anyone else finding strange sounding audio (audio with high pitched tone) and/or very wideband noise outside of the voice passband?? Maybe I am doing something wrong in my setup or testing thus far given the positive reports I read here?? Thanks for any advice, I'd love to be way wrong in what I am seeing!
?
73,
?
Robert, WA2T
?
 

Odd, I see something similar via my Hermes Lite 2.?
?
 

Edit: Maybe I am just overloading the 6400M front end, but my Hermes Lite 2 doesn't sound like this when I listen to it in the same way.? Did try 6400M TX to QMX, SSB RX in the QMX sounds great.
 

Hi Group,
?
I took the plunge today and installed the second SSB beta FW on my 80-20m QMX.? Did the calibration and tried it out.? While I do hear myself well on my nearby Flex 6400M with no antenna, I also hear a fairly high pitched tone and the spectrum (outside of the TX voice passband) looks like "long, slow downhill slopes" if you will.? See picture below of 6400M spectrum/waterfall.? At first I thought it was the mic(s) I was trying, but then thought to try my Behringer XM8500 with the proper wiring to the QMX Paddle input.? Seeing the same thing on all mic's.
?
Is anyone else finding strange sounding audio (audio with high pitched tone) and/or very wideband noise outside of the voice passband?? Maybe I am doing something wrong in my setup or testing thus far given the positive reports I read here?? Thanks for any advice, I'd love to be way wrong in what I am seeing!
?
73,
?
Robert, WA2T
?
 

开云体育

No calibration is needed to listen to SSB. It isn't really needed to transmit SSB either. Better performance for TX if you calibrate.

Tony
AD0VC

From: [email protected] <[email protected]> on behalf of nz0tham via groups.io <nz0tham@...>
Sent: Friday, March 21, 2025 12:56 PM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] #qmx #SSB Firmware beta 1_01_002 release
?
Do I need to do the calibration to listen to SSB and will CW and digital not be affected if I load the beta? I haven’t done anything about a mic yet but want to see how it sounds on RX without affecting CW and digital.
 

Do I need to do the calibration to listen to SSB and will CW and digital not be affected if I load the beta? I haven’t done anything about a mic yet but want to see how it sounds on RX without affecting CW and digital.
 

This SSB update is fun to use! both on digital and SSB modes....
Thank you so much, Hans!
?
But in the interest of finding bugs to smash...:
I attempted to do Calibration from the front panel on the 002 release on my QMX+ (with no USB cable attached), and it locks up at the top calibration menu.
Specifically: power-on, select hardware test menu, scroll to Calibration, and push the select button.? It is all locked up; requires removing power to get back, without ever seeing the Calibration sub-menu.? (I had previously done calibration via the terminal, if that makes any difference...).
Same thing happens on my QMX with the 001 release.? Am I doing something wrong?? Anyone else have this issue?
?
Stan
 

Congratulations and thanks to Hans! Conditions were good enough to make my first contacts today on my QMX on 20m. I built , with trusdx wiring, which has worked great - thanks Adam for your contributions to the community as well!
?
Dan

1 - 20 of 69