[1000mp] Ten-Tec Orion - Roofing filter

Thu, 10 Jul 2003 21:03:04 -0500

Tom, there is a major difference or two between roofing filters and
conventional IF filters in where they are located in the circuitry and their
characteristics.

Changing the present probably fairly wide - 15 kHz or so - roofing filter(s)
might be a major undertaking. It is not just a matter of plugging in a
narrow conventional IF filter.

FWIW . . .

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:[email protected]>

--- Original Message -----
From: "Thomas Beltran" <[email protected]>
To: <[email protected]>
Sent: Thursday, July 10, 2003 8:28 PM
Subject: Re: [1000mp] Ten-Tec Orion - Roofing filter

> I've followed the discussion of the Orion - very interesting.  The current
> QST has a two -page advertisement which described the filtering.  I
started
> thinking about the possibility of putting a selectable roofing filter, a
la
> Sherwood, in the Mark V.  At the expense of sounding dumb, is this
possible?
>
> I have a Drake R4C in which I installed the Sherwood mods, including the
600
> hz first IF.  This works great.  I rarely use the second IF filter (but I
do
> use a Timewave DSP-599zx).  I've read that the first IF filter is very
wide.
> International Crystal has a board to add selectable 2nd (and maybe third)
IF
> filters.  So, would it be possible to create a switching board like Rob
> Sherwoods, to select various roofing filters?  Tom W6EIJ
>
>
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