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QMX Audio Output to WSJT-X

 

Good afternoon from sunny Southwest Florida !

Looking for real world experience and 'thoughts' on the audio output level to WSJT-X when running in DIGI modes.

I'm seeing about 30dB of audio 'input' from my new REV 3 QMX ( _017 firmware) and I am? being seen and heard OK running FT8 and WSPR.?

The volume level in Windows for the 'QMX Transceiver' Input sound is set to 100%.?
QMX Volume knob adjustment does not seems to make a? difference as seen in the WSJT-X dB indicator. (except as noted below).?
I have the 'audio level' configuration parameter set to 4dB but changing that parameter doesn't seem to make much difference.?
I plugged in a set of low end headphones and the volume was BLASTING.
The AMX volume knob certainly affected the sound level in the headphones but dropped the audio into WSJTX way down when the volume was reduced to tolerable levels in the headphones. .

Are others experiencing this too,? or have? I possibly missed some configuration setup??

Any thoughts or recommendations are welcome.?


Greg? KI4NVX
 

Greg,

I am experiencing the same "blasting high" audio in the headphones when selecting Digi Mode. The "Audio Attenuation" settings in the menu affects only the headphone level while the audio provided to WSJT-x remains in the RED at 82 dB regardless of volume setting or attenuation.

This Rev 3 QMX 20-10 kit (with mid-band modification) ) and 017 firmware was completed a few days ago and is also exhibiting lack of receive sensitivity. For example it cannot "hear" FT8 signals on 20 meters, therefore no FT8 operation has been attempted. The reason for this condition is being investigated separately.

A Factory Reset and reload of 017 firmware has had no affect in correcting either condition. All CW transmit functions and output power are operating normally.

Roy- KD1RT
 

Interesting.

My issue is relatively low input audio volume showing in WSJT-X; just a bit below 30 dB. Though WSJT-X shows that as 'green' and I'm making contacts OK.

My 4 other rigs and SDRs have to be dialed back at the rigs, or the Signal Link adapter for my K2 and/or in the Windows sound settings gains to the just about the 60dB level as recommended in the WSJT-X manuals.?

Greg KI4NVX




On Sat, Mar 16, 2024 at 9:15 AM, Roy Thompson
<ka2jyr1@...> wrote:
Greg,

I am experiencing the same "blasting high" audio in the headphones when selecting Digi Mode. The "Audio Attenuation" settings in the menu affects only the headphone level while the audio provided to WSJT-x remains in the RED at 82 dB regardless of volume setting or attenuation.

This Rev 3 QMX 20-10 kit (with mid-band modification) ) and 017 firmware was completed a few days ago and is also exhibiting lack of receive sensitivity. For example it cannot "hear" FT8 signals on 20 meters, therefore no FT8 operation has been attempted. The reason for this condition is being investigated separately.

A Factory Reset and reload of 017 firmware has had no affect in correcting either condition. All CW transmit functions and output power are operating normally.

Roy- KD1RT
 

¿ªÔÆÌåÓý

The QMX has audio output level settings in the configuration. Also if you use flrig to connect to the rig it has a volume slider which I prefer.

73,
Cliff, AE5ZA



On Mar 16, 2024, at 10:13, Greg McCain via <gamccain50@...> wrote:

Interesting.

My issue is relatively low input audio volume showing in WSJT-X; just a bit below 30 dB. Though WSJT-X shows that as 'green' and I'm making contacts OK.

My 4 other rigs and SDRs have to be dialed back at the rigs, or the Signal Link adapter for my K2 and/or in the Windows sound settings gains to the just about the 60dB level as recommended in the WSJT-X manuals.?

Greg KI4NVX




On Sat, Mar 16, 2024 at 9:15 AM, Roy Thompson
<ka2jyr1@...> wrote:
Greg,

I am experiencing the same "blasting high" audio in the headphones when selecting Digi Mode. The "Audio Attenuation" settings in the menu affects only the headphone level while the audio provided to WSJT-x remains in the RED at 82 dB regardless of volume setting or attenuation.

This Rev 3 QMX 20-10 kit (with mid-band modification) ) and 017 firmware was completed a few days ago and is also exhibiting lack of receive sensitivity. For example it cannot "hear" FT8 signals on 20 meters, therefore no FT8 operation has been attempted. The reason for this condition is being investigated separately.

A Factory Reset and reload of 017 firmware has had no affect in correcting either condition. All CW transmit functions and output power are operating normally.

Roy- KD1RT

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<dummyfile.0.part>
 

Hi Greg

>My 4 other rigs and SDRs have to be dialed
>back at the rigs, or the Signal Link adapter for
>my K2 and/or in the Windows sound settings
>gains to the just about the 60dB level as
>recommended in the WSJT-X manuals.?

According to the WSJT-X manual:

"Use the receiver gain controls and/or the computer¡¯s audio mixer controls to set the background noise level (scale at lower left of main window) to around 30 dB when no signals are present."

Not 60dB. The gain per band in QMX (and QDX) can be set in the Band Configuration window. The value required to get 30dB in WSJT-X when no signals are present, will vary by band, by antenna, by build (BPF/LPF tweaking) and by conditions. Luckily it isn't all that critical! I chose the default value 54dB gain in the band configuration window because it seemed to get the output level approximately in the right 30dB ballpark on WSJT-X. It is therefore going to work right out of the box for the plug-and-play user, but the discerning user can make finer adjustments if you find you need more or less gain.?

73 Hans G0UPL


On Sat, Mar 16, 2024, 6:13?PM Greg McCain via <gamccain50=[email protected]> wrote:
Interesting.

My issue is relatively low input audio volume showing in WSJT-X; just a bit below 30 dB. Though WSJT-X shows that as 'green' and I'm making contacts OK.

My 4 other rigs and SDRs have to be dialed back at the rigs, or the Signal Link adapter for my K2 and/or in the Windows sound settings gains to the just about the 60dB level as recommended in the WSJT-X manuals.?

Greg KI4NVX




On Sat, Mar 16, 2024 at 9:15 AM, Roy Thompson
<ka2jyr1@...> wrote:
Greg,

I am experiencing the same "blasting high" audio in the headphones when selecting Digi Mode. The "Audio Attenuation" settings in the menu affects only the headphone level while the audio provided to WSJT-x remains in the RED at 82 dB regardless of volume setting or attenuation.

This Rev 3 QMX 20-10 kit (with mid-band modification) ) and 017 firmware was completed a few days ago and is also exhibiting lack of receive sensitivity. For example it cannot "hear" FT8 signals on 20 meters, therefore no FT8 operation has been attempted. The reason for this condition is being investigated separately.

A Factory Reset and reload of 017 firmware has had no affect in correcting either condition. All CW transmit functions and output power are operating normally.

Roy- KD1RT
 

I profusely apologize.
Senior moment?

30dB is the recommended level for sure.

And I had read about the per band gain control in my initial 2 times through the Ops Manual. It just didn't stick.?

73:Greg KI4NVX



On Sat, Mar 16, 2024 at 12:08 PM, Hans Summers
<hans.summers@...> wrote:
Hi Greg

>My 4 other rigs and SDRs have to be dialed
>back at the rigs, or the Signal Link adapter for
>my K2 and/or in the Windows sound settings
>gains to the just about the 60dB level as
>recommended in the WSJT-X manuals.?

According to the WSJT-X manual:

"Use the receiver gain controls and/or the computer¡¯s audio mixer controls to set the background noise level (scale at lower left of main window) to around 30 dB when no signals are present."

Not 60dB. The gain per band in QMX (and QDX) can be set in the Band Configuration window. The value required to get 30dB in WSJT-X when no signals are present, will vary by band, by antenna, by build (BPF/LPF tweaking) and by conditions. Luckily it isn't all that critical! I chose the default value 54dB gain in the band configuration window because it seemed to get the output level approximately in the right 30dB ballpark on WSJT-X. It is therefore going to work right out of the box for the plug-and-play user, but the discerning user can make finer adjustments if you find you need more or less gain.?

73 Hans G0UPL


On Sat, Mar 16, 2024, 6:13?PM Greg McCain via <gamccain50=[email protected]> wrote:
Interesting.

My issue is relatively low input audio volume showing in WSJT-X; just a bit below 30 dB. Though WSJT-X shows that as 'green' and I'm making contacts OK.

My 4 other rigs and SDRs have to be dialed back at the rigs, or the Signal Link adapter for my K2 and/or in the Windows sound settings gains to the just about the 60dB level as recommended in the WSJT-X manuals.?

Greg KI4NVX




On Sat, Mar 16, 2024 at 9:15 AM, Roy Thompson
<ka2jyr1@...> wrote:
Greg,

I am experiencing the same "blasting high" audio in the headphones when selecting Digi Mode. The "Audio Attenuation" settings in the menu affects only the headphone level while the audio provided to WSJT-x remains in the RED at 82 dB regardless of volume setting or attenuation.

This Rev 3 QMX 20-10 kit (with mid-band modification) ) and 017 firmware was completed a few days ago and is also exhibiting lack of receive sensitivity. For example it cannot "hear" FT8 signals on 20 meters, therefore no FT8 operation has been attempted. The reason for this condition is being investigated separately.

A Factory Reset and reload of 017 firmware has had no affect in correcting either condition. All CW transmit functions and output power are operating normally.

Roy- KD1RT
 

On 16/03/2024 16:08, Hans Summers wrote:
Not 60dB. The gain per band in QMX (and QDX) can be set in the Band Configuration window.
In fact 60dB is recommended by the developers, they've just not updated the manual.
However I find that the input to my QDXs is sometimes much lower than 30dB and I see no obvious degradation of decoding.
The theory says keep the level up to only just avoid clipping, the decoding difference is marginal.
Some will demonstrate a few % greater number of spots but that does not mean a few % lost contacts.

Of course the adjustment in Band Configuration helps, I'm not sure I've ever gone to maximum.

73 Alan G4ZFQ

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