[Elecraft] K3 Notch

[Joe Subich, W4TV]

 > I wonder how the other radios like an IC-7600 can get away with
 > putting it within the agc loop.

Perhaps they're using a fixed level of hardware AGC ahead of the
ADC or intentionally holding the level to the ADC well below
saturation (forfeiting dynamic range) to prevent a strong
interfering signal from clipping.

73,

    ... Joe, W4TV

On 4/26/2010 7:50 PM, N1JM wrote:
>
> I wonder how the other radios like an IC-7600 can get away with
> putting it within the agc loop.
>
> John N1JM
>
> On Mon, Apr 26, 2010 at 4:46 PM, Joe Subich, W4TV-4 [via Elecraft]
> <ml-node+4965758-147492153-44416 at n2.nabble.com>  wrote:
>>
>>
>> On 4/26/2010 7:30 PM, N1JM wrote:
>>>
>>> It's a shame. Such a sophisticated high end radio and no notch within the
>>> agc
>>> loop.
>>
>> Part of the problem is that a DSP radio needs to have the notch after
>> the AGC since part of the function of AGC is preventing the ADC from
>> being over driven.  If the notch is placed BEFORE the AGC detector
>> the notch will cause the interfering signal to INCREASE at the input
>> of the ADC.
>>
>> Yes, it would be nice for the notch to allow the receiver to return
>> to normal gain when the interfering signal is removed but that would
>> merely cause the HAGC to come into play.
>>
>> 73,
>>
>>      ... Joe, W4TV
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>