[Elecraft] K3 Notch Filter

[Arie Kleingeld PA3A]

Paul,

Yes, the IF notch is kept outside the AGC - loop. And I am with you on 
this. It would be so nice to have the notch inside the loop.

More than one reason for the notch outside the agc-loop have been 
communicated in this list.

Summing up a few, but please let the experts help me on this:
- A too strong signal cannot be handled well bij the A/D convertor so 
hardware AGC will have to kick in. This is , I think, a good reason, BUT 
only for strong signals.
- Also increasing distortion is mentioned (IMD?) as a problem. Maybe so, 
but I feel that the AGC that decreases the volume of the whole signal is 
also a large distortion. I cannot tell what is worse and how much 
distortion would be audible if the notch was inside the agc-loop (except 
for the hardware AGC)
- is there more?

Anyway, the K3 is a fine rig in many things, but it is not an ideal rig. 
This notch-thing is one of the not ideal features.

73
Arie PA3A
K3 #12xx



Op 27-4-2012 8:10, paulb schreef:
> The K3 notch filter appears to be after the IF system?
> eg audio type notch, the S meter does not show any
> signal change on steady carrier.
>
> Is this a big deal in the K3 ?
>
>
> cheers
> Paul
> zl1ajy
>
>
>