Re: An AGC story
Posted by
David Gilbert on
Dec 10, 2010; 2:49am
URL: http://elecraft.85.s1.nabble.com/An-AGC-story-tp5817486p5821805.html
OK, but that still doesn't address decay or slope ... parameters I might
want to quickly change dependent upon the amount and type of band noise
(such as when changing to the low bands or when thunderstorms are
active) or the number (not only the level) of signals (pileup or QRM).
I still say a few re-callable combinations of AGC settings would make
sense, even if they had to be initially configured only through the
CONFIG menu.
73,
Dave AB7E
On 12/9/2010 1:17 PM, Don Wilhelm wrote:
> Dave,
>
> You can *effectively* increase the AGC threshold by 10 dB very quickly
> - just turn on the attenuator.
> Actually, that is more effective than reducing the RF Gain because it
> happens at the receiver input rather than at the IF.
> Yes, you can turn the attenuator of the K3 on whether or not the
> Preamp is on.
> And, if you have the S-meter set for "abs" (absolute) mode, it will
> not change with the attenuator or preamp.
>
> If you have signals high enough to produce greater than an S-3 level,
> you will still hear them when you turn the attenuator on, and the
> dynamic range of the K3 is retained.
>
> 73,
> Don W3FPR
>
> On 12/9/2010 3:02 PM, David Gilbert wrote:
>>
>> That is why it would be highly desirable to be able to quickly change
>> AGC settings on the fly, especially when you consider the additional
>> effect that different band noise has on the optimum AGC profile. I can
>> understand Elecraft's reluctance to let users mess with the DSP code via
>> macros, but I don't understand why it should not be possible to use
>> macros to select from a few different AGC settings that have been preset
>> using the CONFIG menu. It doesn't seem rational to me to build all that
>> versatility into the AGC system so that it can be tailored to deal with
>> all sorts of operating conditions ... different levels and types of band
>> noise, different degrees of QRM, different levels of signal strengths,
>> etc ... and then force you to choose only one setting for everything,
>> especially during a contest.
>>
>
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