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QMX+ not receiving on 10m

 

Hello all, my QMX can tx fine on 10m, but I can't even hear ft8, come to think about it, I have never heard anything on 10m. Here are some screenshots:
 

Just wondering if anyone sees this?


On Tue, Apr 29, 2025, 7:14?AM Nico Smith via <nicosmith873=[email protected]> wrote:
Hello all, my QMX can tx fine on 10m, but I can't even hear ft8, come to think about it, I have never heard anything on 10m. Here are some screenshots:
 

Nico-
One weird thing I am seeing is that I'm not hearing anything on FT8 as long as the QMX+ is in Digi mode.? But when I switch to CW, I can hear signals and WSJT-x is decoding them.? This is pretty much on every band.
?
Just curious; do you hear any FT8 signals if you switch to CW mode?
 

I was doing FT8 on 20m today just fine, I will try again in CW mode on 10m tomorrow.


On Wed, Apr 30, 2025, 5:06?PM Larry- WA2VKG via <lbakely=[email protected]> wrote:
Nico-
One weird thing I am seeing is that I'm not hearing anything on FT8 as long as the QMX+ is in Digi mode.? But when I switch to CW, I can hear signals and WSJT-x is decoding them.? This is pretty much on every band.
?
Just curious; do you hear any FT8 signals if you switch to CW mode?
 

Larry, check to male sure I/Q mode is off.
 

Nico, I am traveling so can't respond properly.? ?But these screenshots show that you have some significant problems with your hardware on 10m.? Could be the LPF toroids have a soldering problem, or maybe the bandpass filter.
 

Stan-
I¡¯ll check to make sure I¡¯m not in I/Q mode.
I never would have thought of that. Tnx!
?
Nico- ?Note that whenever WSJTx sends a CAT command, the QMX switches back to Digi mode. At least that¡¯s what I¡¯ve been seeing.?
 

Stan, I will work on the torroids and try to get some enamel off tomorrow.

Larry,? I spent the 3 days of troubleshooting when I first got my qmx+, just to find out that I had IQ mode on, that was a headache.


On Wed, Apr 30, 2025, 8:56?PM Larry- WA2VKG via <lbakely=[email protected]> wrote:
Stan-
I¡¯ll check to make sure I¡¯m not in I/Q mode.
I never would have thought of that. Tnx!
?
Nico- ?Note that whenever WSJTx sends a CAT command, the QMX switches back to Digi mode. At least that¡¯s what I¡¯ve been seeing.?
 

Nico/Stan-
My radio is currently out of the enclosure and the board is on the bench; I've been reflowing the inductor/transformer solder joints and looking for shorts.? When I put it back together, I'll check for the I/Q mode setting.? I'm sure I didn't put it in I/Q mode purposely, but maybe it got there accidently.? Also note that it is in USB digital mode and the CW-reverse option is off.
But when I get it all back together I'll take a look at the settings (and if it's still not working, I'll start a new thread).? Thanks for the suggestion and encouragement.?
?
I hope you find your problem with 10 meters. As Stan said, it does seem that there might be something wrong with your bandpass or LP filters that are used on that band.
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I think I fixed the bpf for 10m, but I don't think the SSB calibration should look like this...

Screenshot 2025-05-03 115038.png
Screenshot 2025-05-03 115026.png

 

¿ªÔÆÌåÓý

Mine looks similar. I think it is OK.

Tony
AD0VC

From: [email protected] <[email protected]> on behalf of Nico Smith via groups.io <nicosmith873@...>
Sent: Saturday, May 3, 2025 9:53 AM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ not receiving on 10m
?
I think I fixed the bpf for 10m, but I don't think the SSB calibration should look like this...
 

Stan-
After re-flowing solder joints, I put my QMX+ back together and confirmed (unfortunately), that the IQ Mode is indeed disabled.
I'm still seeing some weird things regarding WSJT-x reception in the Digital mode, but this is all off-topic from Nico's original message.? I've discovered some interesting things; I'll create a separate thread for this topic.
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Nico- keep us posted; I hope you find the cause of your 10 meter problem soon.
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Larry
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