Recommended AGC settings for 4.51?

[NZ0T]

I just downloaded 4.51 and before I start messing around with changing settings can anyone recommend a good starting point for general use?

73 Bill NZ0T

[Cady, Fred]

I can't give you an answer to that but you probably want to stay away
from THR=20 because at that level the SLP acts like SLP=15. Here are
some plots that I made showing the interaction between THR and SLP.
http://www.ke7x.com/home/miscellaneous-k3-information/agc-4-51
I think what you will find is that the optimum settings for THR and SLP
like those for the NR and NB, depend on conditions at the time and what
you are trying to do.
Cheers and 73,
Fred KE7X
 

-----Original Message-----
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[mailto:[hidden email]] On Behalf Of NZ0T
Sent: Sunday, May 13, 2012 4:02 PM
To: [hidden email]
Subject: [Elecraft] Recommended AGC settings for 4.51?

I just downloaded 4.51 and before I start messing around with changing
settings can anyone recommend a good starting point for general use?

73 Bill NZ0T

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[Nate Bargmann]

* On 2012 14 May 00:25 -0500, NZ0T wrote:
> I just downloaded 4.51 and before I start messing around with changing
> settings can anyone recommend a good starting point for general use?

Looking at Fred's graphic, I've chosen AGC SLP 004 and AGC THR 016.

Last night I ran across the 6O0CW pileup on 40m CW and after opening up
the passband, it seemed as though the signal handling was very good.  I
had not spent any time listening to pileups before, it wasn't an A/B
test.

My volume control now hovers around 8 to 9 O'clock rather than the 10 to
11 O'clock as before for a comfortable level.  With these settings loud
signals "sound" louder.  I just loaded the new FW late last night and
will need to spend more time with it, but I am pleased so far.  Thanks
to the Elecraft crew for this update.

73, de Nate, N0NB >>

--

"The optimist proclaims that we live in the best of all
possible worlds.  The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
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[Jim-3]

AGC SLP 008 and AGC THR 014.

NB   DSP t2-1  IF nar3

NR    NRmF6-1

But still playing.

KE4WY Jim

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Nate Bargmann
Sent: Monday, May 14, 2012 7:21 AM
To: [hidden email]
Subject: Re: [Elecraft] Recommended AGC settings for 4.51?

* On 2012 14 May 00:25 -0500, NZ0T wrote:
> I just downloaded 4.51 and before I start messing around with changing
> settings can anyone recommend a good starting point for general use?

Looking at Fred's graphic, I've chosen AGC SLP 004 and AGC THR 016.

Last night I ran across the 6O0CW pileup on 40m CW and after opening up the
passband, it seemed as though the signal handling was very good.  I had not
spent any time listening to pileups before, it wasn't an A/B test.

My volume control now hovers around 8 to 9 O'clock rather than the 10 to
11 O'clock as before for a comfortable level.  With these settings loud
signals "sound" louder.  I just loaded the new FW late last night and will
need to spend more time with it, but I am pleased so far.  Thanks to the
Elecraft crew for this update.

73, de Nate, N0NB >>

--

"The optimist proclaims that we live in the best of all possible worlds.
The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
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[alsopb]

Hi Bill,

It all depends upon the range of loudness range you want your ears to
tolerate.

I did some plots (SLOPE=12) for THR =10, 12, 13.   I used the K3 S meter
high resolution readout, the K3 dBV readout and a variable output signal
generator.   The RF gain calibration and Smeter calibration were done
first using an XG2.

With a THR of 13, I get about a 40db change from the min detectable
signal and S9+50db. The AGC kicks in at about S6-7 with these settings.

Lower values of THR give lower S meter values of AGC activation and less
audio range.

The starting values were really obtained by what sounded good.   The
data collection was done after.
So ears work as a way to set these parameters.

73 de Brian/K3KO


On 5/13/2012 6:01 PM, NZ0T wrote:

> I just downloaded 4.51 and before I start messing around with changing
> settings can anyone recommend a good starting point for general use?
>
> 73 Bill NZ0T
>
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> View this message in context: http://elecraft.365791.n2.nabble.com/Recommended-AGC-settings-for-4-51-tp7555513.html
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