That's correct. "AGC Off" in the Orion is just very fast AGC.
Also, under all conditions, hardware AGC kicks in at about s9+20dB to
prevent overloading the ADC.
Barry N1EU
On Sat, Dec 20, 2014 at 3:46 PM, Kim Elmore <cw_de_n5op@sbcglobal.net>
wrote:
>
> I think the problem with that approach is that you can't truly turn off
> the AGC in the Orion II. At some level, it is required for parts of the
> DSP. I'm not sure what happens when you select "off" for the AGC. I think I
> saw it discussed here a year or two ago, but it's not like turning off the
> AGC in an analog receiver. The Orion II is truly a DSP radio and some
> things must be done differently for real-time DSP to work without some
> pretty hideous artifacts.
>
> Kim N5OP
>
>
> On 12/19/2014 4:13 PM, Richards wrote:
>
>> Good stuff. So, I suppose I am nuts for turning AGC off, and working
>> the RF-GAIN control?
>>
>> I understand Rob Sherwood, among others, have problems with local noise
>> causing issues with AGC on the Omni VII and other radios - a strong local
>> noise event causes AGC to silence the rig for a moment. This can be
>> somewhat annoying, not to mention inconvenient. So, I simply turn AGC off
>> and operate without it.
>>
>> Is AGC really a boon, or necessary feature, ...or merely a convenience
>> saving us from tweaking the knobs during a contact. Some guys don't use DSP
>> NR... obviously we do not always embrace newer, high tech features. ;-)
>> ;-)
>>
>> Am I out of step here?
>>
>>
>> As for actual plots, that would be interesting... I think TT provides a a
>> brief explanation of the AGC functions in the manual and in documentation
>> supporting the more recent firmware, but I found it a bit terse and
>> technical - not all ham operators are engineers, so I would appreciate a
>> less technical gloss thereon.
>>
>>
>> ======================== K8JHr ================
>>
>>
>>
>>
>> On 12/19/2014 8:57 AM, Barry N1EU wrote:
>>
>>> I'd like to see a plot of actual behavior of those AGC slope settings.
>>>
>>>
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>>
>>
> --
>
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
> SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>
> /"In theory there is no difference between theory and practice. But, in
> practice, there is." //-- Attributed to many people; it's so true that it
> doesn't matter who said it./
>
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