[TenTec] Roofing Filters

[Carl Moreschi]

The term roofing filter means a filter that limits bandwidth before the
final stage of filtering.  Because of this, roofing filters do not have to
have sharp shape factors.

Carl Moreschi N4PY
121 Little Bell Drive
Bell Mountain
Hays, NC 28635
----- 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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