Posted by
Greg - AB7R on
May 16, 2007; 9:29pm
URL: http://elecraft.85.s1.nabble.com/K3-IF-AF-Dsp-questions-comparisons-tp447571p447572.html
Don,
I don't think the concern here is with S9 signals, but
rather much stronger ones. Here is a clip from Erics
article talking about roofing filters......
If you only use the 2.7 kHz stock filter for CW or data
operation you will be significantly desensed once signals
within that filter's bandwidth exceed about S9+25.
Hope that helps...
73
Greg
AB7R
On Wed, 16 May 2007 14:23:54 -0700 (PDT)
Don Rasmussen <
[hidden email]> wrote:
> The 756pro has no roofing filters, yet there is little
> or no AGC pumping when listening to an S2 signal with
> the DSP filter set to 500hz and a S9 signal is within
> the 15khz first hardware filter. I'm hoping the K3 can
> do at least this well without switching in a roofing
> filter of less than 2.7khz.
>
> The TenTec Argo V will pump somewhat in the same
> scenario and pump very hard in a contest, at times
> swamping the receiver. It's a great radio for a quiet
> afternoon or contesting with modest antennas.
>
> The TS480Sat will pump dramatically and you need to
> leave the 500hz filter in line anytime there is an S9
> signal within the 2.8khz ssb filter. The 500hz filter
> is superb for selectivity but adds a very high level
> of background noise when the bands are not quiet.
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