[TenTec] Roofing Filters

[Phil Chambley, Sr.]

I thought the term "Roofing Filter" was meant to describe a filter
immediately following a mixer stage, its purpose being to shave off unwanted
mixer products before any post-mixer amplification.

Phil
www.k4dpk.com
----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at hawaiiantel.net>
To: <ken.d.brown at hawaiiantel.net>; "Discussion of Ten-Tec Equipment"
<tentec at contesting.com>
Sent: Monday, May 29, 2006 5:16 PM
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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