[Elecraft] 8 pole vs 5 pole..I knew this would happen

[Bill W5WVO]

Irrespective of the original source of the term "roofing filter", it seems 
clear enough that whoever made it up wanted to imply the idea of protection, 
which is the word used in the RSGB document. A ROOF is a first line of 
protection against having nearby high-energy stuff from the outside world 
(rain, hail, falling rocks and trees) hit you in the head.  :-)  A ROOFING 
FILTER is likewise a first line of protection for the stage that follows it 
against nearby high-energy signals hitting it in the head. (Er, the base, or 
the gate, or whatever.) Whether it was first used in some marketing brochure 
or in an engineering paper, the term nonetheless is aptly descriptive. Since 
the concept involved really has to be understood in order for the term to 
make sense, however, I tend to lean toward the idea that it was made up by 
an engineer. Most marketing guys aren't that smart. Uh, no offense intended. 
:-)

Bill / W5WVO
Darwin, Keith wrote:
> Marketing term, I tell ya, pushed extra hard by the sales folks at
> YaeComWood.  :-)
>
> -----Original Message-----
>
> ... it describes the filter as a "roofing filter" although Drake does
> not use the term in its technical manual.
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com