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

[Fred (FL)]

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

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