[Elecraft] Re: roofing filters - when to use them

[Nick Lidakis]

Fred (FL) wrote:
> I think before we describe what operational artifacts,
> roofing filters impact - someone needs to define what
> a ROOFING FILTER is?  Is it different from the
> filters one buys for his IC-706?   Why is it called
> a ROOFING FILTER?   What job is a ROOFING FILTER
> supposed to do?  What does ROOFING have to do with
> anything?  Does it have some magical frequency
> response curve - I would see via my CAD program?
> Is it a elemental RLC type circuit - passive?
>
>  In other words - before one discusses the great uses
> of a positraction rear end in my chevy - for what
> reason was the positraction rear end designed for and
> what are its characteristics, in the first place?
>
> Why do I need a roofing filter - I guess that is
> what is bothering me ...............  :)
>
> Fred, N3CSY
>
>   
I found this on Wikipedia: http://en.wikipedia.org/wiki/Roofing_filter

How accurate it is, I don't know. Would anyone else care to elaborate?

Nick N2SVT