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OT: Windows 7 AGC on Input

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NK7Z

OT: Windows 7 AGC on Input

Hello,

I am trying to solve a slight digital problem, using my K3. I suspect
that Windows 7 has an AGC of some type on it controlling the Line Input
levels.

Can someone verify if this is true, and if so, is there a way to disable
the AGC on input?

--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net

For MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
For Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
For MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

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Scott-2

Re: OT: Windows 7 AGC on Input

Hi David,
I'm not sure I'd call it a Win7 AGC but there are two controls regarding
audio input.

On my Win7 box I have a special app for the soundcard installed (Realtek
in my case) in control panel. This app has three controls for Line In
settings.

Additionally under control panel is another Win7 App "Sounds". This
also has controls for a "microphone". You must highlight the microphone
with a single click to get the configuration button to "come alive".
Several more settings in there. Make sure you disable all of the Win7
sound schemes. Hope this helps.

Scott
AD5HS

On 10/4/2015 10:39 AM, David Cole wrote:
> Hello,
>
> I am trying to solve a slight digital problem, using my K3. I suspect
> that Windows 7 has an AGC of some type on it controlling the Line Input
> levels.
>
> Can someone verify if this is true, and if so, is there a way to disable
> the AGC on input?
>
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Rick WA6NHC

Re: OT: Windows 7 AGC on Input

In reply to this post by NK7Z

From my saved email files... it may help/apply.

-=-=-=-=-=-=-=--=

Found this article posted on the Yahoo Groups Ten-Tec Omni VII group today: https://www.reddit.com/r/amateurradio/comments/3eytah/huge_windows_bug_ruining_your_receive_performance/

The article discusses a Windows Vista and later versions bug when interfacing with an audio device utilizing the Texas Instruments PCM2900 series PCM2904 and below, pre-C revisions device. The article also shows a permanent (software configuration change) fix for the bug.

The article states that all Signalink USB digital mode interfaces are affected by this bug.

Knowing that some of you are using the Signalink USB, I’m sending you this info in case you were not already aware of it.

Some of you may have rigs with a direct computer interface for digital mode operation. Your rig may use the affected TI device. If so, you are also affected.

In my case, I use the Signalink USB. When I first installed it, I noted I had to run the Signalink’s RX gain and Codec gain controls very low to get good levels to the computer. As a result, I added a 10:3510 or -51db (voltage) divider on the Signalink’s input (mounted on the rig programming socket inside the unit). Now I know why that was required – the bug in Windows for the audio device being used. With the bug fix from the article, I have now reverted back to not using the voltage divider. Hopefully, levels are now above noise floor values and results will be better. I’ve also downloaded and installed the digital level meter applet the author mentioned. It is available at http://www.darkwooddesigns.co.uk/pc2/meters.html, about 1/3 down in the page.

Hope you find this article useful.
--

Rick, WA6NHC

iPad = small keypad = typos = sorry ;-)

> On Oct 4, 2015, at 8:39 AM, David Cole <[hidden email]> wrote:
>
> Hello,
>
> I am trying to solve a slight digital problem, using my K3. I suspect
> that Windows 7 has an AGC of some type on it controlling the Line Input
> levels.
>
> Can someone verify if this is true, and if so, is there a way to disable
> the AGC on input?
>
> --
> Thanks and 73's,
> For equipment, and software setups and reviews see:
> www.nk7z.net
>
> For MixW support see;
> http://groups.yahoo.com/neo/groups/mixw/info
> For Dopplergram information see:
> http://groups.yahoo.com/neo/groups/dopplergram/info
> For MM-SSTV see:
> http://groups.yahoo.com/neo/groups/MM-SSTV/info
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

NK7Z

Re: OT: Windows 7 AGC on Input

Hi,
Thank you, however I have been over that one... I think Mike Flowers
hit the correct answer...
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net

For MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
For Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
For MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

On Sun, 2015-10-04 at 20:06 -0700, Rick Bates, WA6NHC wrote:

> From my saved email files... it may help/apply.
>
>
> -=-=-=-=-=-=-=--=
>
> Found this article posted on the Yahoo Groups Ten-Tec Omni VII group
> today: https://www.reddit.com/r/amateurradio/comments/3eytah/huge_windows_bug_ruining_your_receive_performance/
>
>
>
> The article discusses a Windows Vista and later versions bug when
> interfacing with an audio device utilizing the Texas
> Instruments PCM2900 series PCM2904 and below, pre-C revisions device.
> The article also shows a permanent (software configuration change) fix
> for the bug.
>
>
>
> The article states that all Signalink USB digital mode interfaces are
> affected by this bug.
>
>
>
> Knowing that some of you are using the Signalink USB, I’m sending you
> this info in case you were not already aware of it.
>
>
>
> Some of you may have rigs with a direct computer interface for digital
> mode operation. Your rig may use the affected TI device. If so, you
> are also affected.
>
>
>
> In my case, I use the Signalink USB. When I first installed it, I
> noted I had to run the Signalink’s RX gain and Codec gain controls
> very low to get good levels to the computer. As a result, I added a
> 10:3510 or -51db (voltage) divider on the Signalink’s input (mounted
> on the rig programming socket inside the unit). Now I know why that
> was required – the bug in Windows for the audio device being used.
> With the bug fix from the article, I have now reverted back to not
> using the voltage divider. Hopefully, levels are now above noise
> floor values and results will be better. I’ve also downloaded and
> installed the digital level meter applet the author mentioned. It is
> available at http://www.darkwooddesigns.co.uk/pc2/meters.html, about
> 1/3 down in the page.
>
>
>
> Hope you find this article useful.
>
> --
>
>
>
>
>
>
>
> Rick, WA6NHC
>
>
> iPad = small keypad = typos = sorry ;-)
>
> On Oct 4, 2015, at 8:39 AM, David Cole <[hidden email]> wrote:
>
>
> > Hello,
> >
> > I am trying to solve a slight digital problem, using my K3. I
> > suspect
> > that Windows 7 has an AGC of some type on it controlling the Line
> > Input
> > levels.
> >
> > Can someone verify if this is true, and if so, is there a way to
> > disable
> > the AGC on input?
> >
> > --
> > Thanks and 73's,
> > For equipment, and software setups and reviews see:
> > www.nk7z.net
> >
> > For MixW support see;
> > http://groups.yahoo.com/neo/groups/mixw/info
> > For Dopplergram information see:
> > http://groups.yahoo.com/neo/groups/dopplergram/info
> > For MM-SSTV see:
> > http://groups.yahoo.com/neo/groups/MM-SSTV/info
> >
> >
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> >