[TenTec] Why "roofing" ?

[Carl Moreschi]

The term "Roofing filter" applies to a filter that is at the very first IF
of a receiver chain.  This prvents unwanted signals from going any further
in the radio and causing potential problems.   Normally what is refered to
as a roofing filter does not do all the bandpass filtering, just early
filtering.  In the Orion, the roofing filters are at 9 mhz and wider than
the DSP filters which are at a later stage at the 14 khz IF.  The DSP
filters provide a much tigher bandpass with much steeper skirts.

Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: <Able2fly at aol.com>
To: <tentec at contesting.com>
Sent: Tuesday, August 03, 2004 5:46 PM
Subject: [TenTec] Why "roofing" ?


> Can someone please explain how a "roofing" filter differs from the old
> fashioned (band pass) IF filter? Or is it just another name for it?
>
> Bill  K3UJ
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