Re: [wsjt-devel] tx audio equalisation, just a thought.

[Libor Holouš]

Sorry Mike.. This was directed to Peter of course.. :-)
  - Original Message - 
  From: Libor Holouš 
  To: WSJT software development 
  Sent: Friday, January 26, 2018 12:31 PM
  Subject: Re: [wsjt-devel] tx audio equalisation, just a thought.


  Hello Mike, --
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Re: [wsjt-devel] tx audio equalisation, just a thought.

[Libor Holouš]

Hello Mike, 
just for sure, have you checked, that your sound card doesn't use equalising 
settings?
Some soundcards do have this possibility and in my PC serviceman career I have 
seen many times, that people complained for audio quality in Skype and finaly 
they had switched some DSP effects, like "bathroom" on. Typicaly it was Realtek 
HD audio.. But some other have this functionality too. (If not using USB 
dongle. :-)
If not and you have this possibility, it could solve your issue a bit, because 
you could create some own profile and use equaliser and W-mtr to calibrate all 
subaudioband to one power level (using tune button and clicking by watterfall). 
Of course not as great as you suggest, but can help a bit.

See my IDT audio panel:



73 Libor
  
- Original Message - 
From: "Bill Somerville" <g4...@classdesign.com>
To: <wsjt-devel@lists.sourceforge.net>
Sent: Friday, January 26, 2018 11:49 AM
Subject: Re: [wsjt-devel] tx audio equalisation, just a thought.


> On 26/01/2018 10:28, Peter Sumner wrote:
>> Hello Mike,
>> can you offer some URL's as I have exhausted my google searches for 
>> both of those suggestions... all I get is topic about fishing for rig 
>> split and fake it gives me pages of topics about the US president and 
>> his fake news. have tried various other combinations but as I do not 
>> know what they are meant to do it is hard to refine the searches.
>>
>> Peter.
> 
> Hi Peter,
> 
> I think Mike may have missed that you are using EME on the microwave 
> bands. The facility he suggests is only appropriate and available for 
> the narrower modes used commonly on HF.
> 
> With respect to your original request, I do see some merits but 
> profiling your Tx pass band characteristics for a mode like QRA64 
> although it is quite tricky given the number of frequencies that need 
> calibration. The implementation would not be too hard as a simple table 
> of factors would be mapped to each tone frequency within the digital 
> audio synthesizer, OTOH the work to implement a maintenance facility for 
> the correction factors would be considerable and I doubt considered 
> worth the payback. Also modern rigs are dealing with this more 
> fundamentally by providing SSB-DATA modes tailored for AFSK operation 
> which have very flat pass band characteristics.
> 
> 73
> Bill
> G4WJS.
> 
> 
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Re: [wsjt-devel] tx audio equalisation, just a thought.

[Bill Somerville]

On 26/01/2018 10:28, Peter Sumner wrote:

Hello Mike,
 can you offer some URL's as I have exhausted my google searches for 
both of those suggestions... all I get is topic about fishing for rig 
split and fake it gives me pages of topics about the US president and 
his fake news.  have tried various other combinations but as I do not 
know what they are meant to do it is hard to refine the searches.


Peter.


Hi Peter,

I think Mike may have missed that you are using EME on the microwave 
bands. The facility he suggests is only appropriate and available for 
the narrower modes used commonly on HF.


With respect to your original request, I do see some merits but 
profiling your Tx pass band characteristics for a mode like QRA64 
although it is quite tricky given the number of frequencies that need 
calibration. The implementation would not be too hard as a simple table 
of factors would be mapped to each tone frequency within the digital 
audio synthesizer, OTOH the work to implement a maintenance facility for 
the correction factors would be considerable and I doubt considered 
worth the payback. Also modern rigs are dealing with this more 
fundamentally by providing SSB-DATA modes tailored for AFSK operation 
which have very flat pass band characteristics.


73
Bill
G4WJS.


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Re: [wsjt-devel] tx audio equalisation, just a thought.

[Peter Sumner]

Hello Mike,
 can you offer some URL's as I have exhausted my google searches for both
of those suggestions... all I get is topic about fishing for rig split and
fake it gives me pages of topics about the US president and his fake news.
have tried various other combinations but as I do not know what they are
meant to do it is hard to refine the searches.

Peter.

On Fri, Jan 26, 2018 at 3:30 PM, Black Michael via wsjt-devel <
wsjt-devel@lists.sourceforge.net> wrote:

> You run either rig split or fakeit.  That keeps all your audio in the
> 1500-2000 range.
>
> de Mike W9MDB
>
>
>
> On Thursday, January 25, 2018, 7:02:45 PM CST, Peter Sumner <
> vk8...@gmail.com> wrote:
>
>
> Hello,
>  first off, sorry if this subject has already been discussed and resolved
> but could not see anything on my searches.
>
> As the owner of an older Icom VHF SSB rig, I have a seemingly common
> problem that my TX pass band is not flat, in fact using QRA64-D earlier
> today with Rex, VK7MO revealed a significant ripple across the tones (about
> 3db) seen on the Bird output power meter.
> As I am unsure how much control there is over the level of the tones
> generated by WSJT-X but I wondered if there is a way to build in a simple
> level control for TX tones across the passband?
> In my head I had thought an adjuster for 500-750 750-1000 1000-1250 and so
> on and be able to change the nominal value from 0db (flat) to be -1db or
> +1db for each segment of the decided passband...
>
> Maybe others have a better way of managing this that is not part of WSJTX?
>
> Regards,
> Peter, vk5pj
> 
> --
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> 
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>
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Re: [wsjt-devel] tx audio equalisation, just a thought.

[Black Michael via wsjt-devel]

You run either rig split or fakeit.  That keeps all your audio in the 1500-2000 
range.
de Mike W9MDB



On Thursday, January 25, 2018, 7:02:45 PM CST, Peter Sumner 
 wrote:  
 
 Hello, first off, sorry if this subject has already been discussed and 
resolved but could not see anything on my searches.
As the owner of an older Icom VHF SSB rig, I have a seemingly common problem 
that my TX pass band is not flat, in fact using QRA64-D earlier today with Rex, 
VK7MO revealed a significant ripple across the tones (about 3db) seen on the 
Bird output power meter.As I am unsure how much control there is over the level 
of the tones generated by WSJT-X but I wondered if there is a way to build in a 
simple level control for TX tones across the passband?In my head I had thought 
an adjuster for 500-750 750-1000 1000-1250 and so on and be able to change the 
nominal value from 0db (flat) to be -1db or +1db for each segment of the 
decided passband...
Maybe others have a better way of managing this that is not part of WSJTX?
Regards,Peter, 
vk5pj--
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[wsjt-devel] tx audio equalisation, just a thought.

[Peter Sumner]

Hello,
 first off, sorry if this subject has already been discussed and resolved
but could not see anything on my searches.

As the owner of an older Icom VHF SSB rig, I have a seemingly common
problem that my TX pass band is not flat, in fact using QRA64-D earlier
today with Rex, VK7MO revealed a significant ripple across the tones (about
3db) seen on the Bird output power meter.
As I am unsure how much control there is over the level of the tones
generated by WSJT-X but I wondered if there is a way to build in a simple
level control for TX tones across the passband?
In my head I had thought an adjuster for 500-750 750-1000 1000-1250 and so
on and be able to change the nominal value from 0db (flat) to be -1db or
+1db for each segment of the decided passband...

Maybe others have a better way of managing this that is not part of WSJTX?

Regards,
Peter, vk5pj
--
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