Sloped AGC

[Bill W4ZV]

K8CV:
 >I found a neat option on the new Orion II that seems great cw. It is not in
the manual. It is called slope or something like that. It is the last item
in the RX menu. It has to do with the audio and normal is flat, probably for
SSB ? But you can set the slope to 1.1 or 2.2 db and I first tried it on 80M
noise and didn't seem to do a thing. Naturally I said " oh well " and later
gave it a try on cw and a BIG difference. The signal seems to pop up out of
the noise. Neat ........... will my sometime this year K-3 have that ?

         Yes, see below.  73,  Bill  W4ZV

KK7P:

In the menu, you can set the following parameters for AGC:

Attack time, Hold (Hang) time, Decay rate (in dB/sec for Fast and
Slow), Threshold, and Slope. Slope sets the compression you get from
AGC, whether you like everything above the threshold to be flat (S4
and 40 over S9 are the same level) or some sort of slope (2:1, 10:1
whatever) so stronger signals are somewhat louder.

http://www.ac6rm.net/mailarchive/html/elecraft-list/2007-04/msg00935.html

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[Jack Smith-6]

You might be interested in the AGC input versus output performance data
I  took for the K2 and several other receivers.
http://www.cliftonlaboratories.com/receiver_agc_curves.htm

To some extent, the K2 already implements this feature. Whether this is
an intentional design decision or a byproduct of other decisions made
during the K2's design, I do not know. In my opinion, it is one of the
reasons for the distinct "K2 sound."

Jack K8ZOA
www.cliftonlaboratories.com


Bill Tippett wrote:

> K8CV:
> >I found a neat option on the new Orion II that seems great cw. It is
> not in
> the manual. It is called slope or something like that. It is the last
> item
> in the RX menu. It has to do with the audio and normal is flat,
> probably for
> SSB ? But you can set the slope to 1.1 or 2.2 db and I first tried it
> on 80M
> noise and didn't seem to do a thing. Naturally I said " oh well " and
> later
> gave it a try on cw and a BIG difference. The signal seems to pop up
> out of
> the noise. Neat ........... will my sometime this year K-3 have that ?
>
>         Yes, see below.  73,  Bill  W4ZV
>
> KK7P:
>
> In the menu, you can set the following parameters for AGC:
>
> Attack time, Hold (Hang) time, Decay rate (in dB/sec for Fast and
> Slow), Threshold, and Slope. Slope sets the compression you get from
> AGC, whether you like everything above the threshold to be flat (S4
> and 40 over S9 are the same level) or some sort of slope (2:1, 10:1
> whatever) so stronger signals are somewhat louder.
>
> http://www.ac6rm.net/mailarchive/html/elecraft-list/2007-04/msg00935.html
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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