AGC threshold

[Pete Smith N4ZR]

Are there engineering reasons why the AGC threshold level can be set no
higher than 8?  KE7X suggests that this value, if increased, would lead
to better performance in receiving pileups, without having to turn off
the AGC altogether.

--
73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000


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[Dave Hachadorian]

Need threshold higher than 8, and Slope with a number less than
zero, which translates to a steeper curve.

With such settings, AGC would be used for hardware protection and
hearing protection only.  The linear part of the curve would be
maximized.


Dave Hachadorian, K6LL
Yuma, AZ



-----Original Message-----
From: Pete Smith
Sent: Thursday, December 09, 2010 7:01 AM
To: Elecraft List
Subject: [Elecraft] AGC threshold

Are there engineering reasons why the AGC threshold level can be
set no
higher than 8?  KE7X suggests that this value, if increased,
would lead
to better performance in receiving pileups, without having to
turn off
the AGC altogether.

--
73, Pete N4ZR

The World Contest Station Database, updated daily at
www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at
reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000


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[Guy, K2AV]

I have suggested an AGC setting where the response is linear until a
maximum audio level is reached, where the AGC cuts in flat with with a
slow decay that converts to fast decay over one second.  To set up for
this, turn your audio to your "normal" audio.  Then tune in a very
strong carrier.  Adjust the audio limiter in config to the loudest
tone you want to hear. Use the RF gain/PRE/ATT to get the band ambient
noise at a comfortable level.  For this "contest" AGC, "light" both
the S and F on the display.  I believe this will give the results of
riding RF gain with no AGC, without the blasts.

For myself, the above should be what you should get with AGC in the
off position, but that is another discussion.

73, Guy.

On Thu, Dec 9, 2010 at 10:05 AM, Dave Hachadorian <[hidden email]> wrote:

> Need threshold higher than 8, and Slope with a number less than
> zero, which translates to a steeper curve.
>
> With such settings, AGC would be used for hardware protection and
> hearing protection only.  The linear part of the curve would be
> maximized.
>
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
>
> -----Original Message-----
> From: Pete Smith
> Sent: Thursday, December 09, 2010 7:01 AM
> To: Elecraft List
> Subject: [Elecraft] AGC threshold
>
> Are there engineering reasons why the AGC threshold level can be
> set no
> higher than 8?  KE7X suggests that this value, if increased,
> would lead
> to better performance in receiving pileups, without having to
> turn off
> the AGC altogether.
>
> --
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at
> www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at
> reversebeacon.blogspot.com,
> spots at telnet.reversebeacon.net, port 7000
>
>
> ______________________________________________________________
> 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
>
> ______________________________________________________________
> 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
>

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