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[TenTec] INRAD Omni VI roofing filter kit - success

To: tentec@contesting.com
Subject: [TenTec] INRAD Omni VI roofing filter kit - success
From: Bill Tippett <btippett@alum.mit.edu>
Reply-to: tentec@contesting.com
Date: Fri, 14 Jan 2005 21:51:46 -0500
List-post: <mailto:tentec@contesting.com>
WA3JPG wrote:
>The only thing you might have wanted is a separate switch to put the
roofing filter in/out even when you have the NAR filter pressed.
Normally, the NAR switch (or ONE of the NAR1 and NAR2 switches in the
OMNI VI plus and option 3 versions) puts the roofing filter in line.
You could, conceivably, use another switch somewhere else, and put the
stock 15 kHz roofing filter in line (roofing filter mod out of circuit)
when you wanted to without reference to any other switch.

        Seems like a major goof by Inrad.  I have N4SU's Omni VI which
I am checking out before I sell it for his XYL.  It has the special
Ten-Tec 221 250 Hz filter centered on 9.000500 in the Narrow position
for those like a low pitch (the 219 won't center if you set pitch to
400 Hz).  If someone were to install Inrad's roofing filter as
currently implemented, they have 2 choices:

1.  Leave the 221 in and live with the fact that you would never be
able to have anything but a 250 Hz bandwidth when you engaged the
roofing filter and 250 Hz is not very practical for general tuning.

2.  Remove the 221 so that depressing Nar only engages the roofing
filter.  Not a nice solution since then you can't use the 221.

        The alternative of a separate switch for the roofing filter as
you suggested is very good.  Then you could engage it AND separately
engage Nar when you wanted the 250 Hz 221 inline.  Hopefully George
will get feedback from his beta testers and come up with a better
solution before he goes into final production.

73, Bill W4ZV

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