[TenTec] Roofing Filters

[NJ0IP]

The first time I became familiar with roofing filters was in the early
1970's when all us contesters bought Sherwood filters for our Drake R4C's.
We didn't use the term "Roofing" but it was the same thing.

73
Rick

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Ken Brown
Sent: Monday, May 29, 2006 2:16 PM
To: ken.d.brown at hawaiiantel.net; Discussion of Ten-Tec Equipment
Subject: [TenTec] Roofing Filters

In my previous post I should have changed the subject title.
Another observation about the term "roofing filter":
I don't recall hearing the term used until receivers were being made 
that used IF DSP.
Is the term only applicable to receivers using IF DSP?
I know that Inrad makes a roofing filter modification for the Omni VI 
rigs. Is that an incorrect usage of the term?
All filters in all stages of a receiver perform essentially the same 
functions. That is to limit the bandwidth that following stages have to 
handle, and when before a mixer to reject image response, or when before 
a ADC in a DSP receiver to reduce aliasing responses. So what makes some 
filters "roofing filters" and others not?

DE N6KB


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