[1000mp] Roofing Filters

[Ron]

I think you are doing it right and yes as far as the signal goes 1 or 2 
dB  at the noise level does make a difference but once a signal is 15 db 
below the noise then improving it to 25 dB below the noise is not a 
detectable difference.  It is this distortion beat or signal that I have 
been talking about.    It also sounds like the amplifier after the 
roofing filter might not be as robust as it should be and that is 
probably where some work could be don't that would improve the radio so 
a roofing filter would have very little affect.

Ron  WA0KDS

Winston Rogers wrote:

>Long thread... Here is my two cents.  I am interested primarily in CW.  The
>selectivity I need on cw can be achieved with filters, for the most part.
>It would be nice to have a tight roofing filter but I am not prepared to
>give up my IF Mod in that slot.
>
>
>
>Some have said that a few db cannot be heard.  When those few db are the
>difference between the signal and the noise level they make all the
>difference in the world.  The IF Mod gives me those few db right at the
>noise level. Even one db above the noise is good and usable.
>
>
>
>I invite your opinion.
>
>
>
>Winw0lz.
>
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