My OMNI VI with OPT 3, it is not a VI+. I have been monkeying around with
the DIP switch on the INRAD roofing filter cca and the jumper next to the
It seems as though the OEM narrow filter is bypassed. I am wondering if the
INRAD Mod is bypassing the "now installed" 1st IF cw filter. The INRAD
Roofing Filter is a "CW Filter". I did notice one switch/jumper
configuration that the received signal strength on the S meter drops 3-4 s
units. I have not checked that config in a ugly pile-up to see if that is
the config that selects the roofing filter and the 400Hz INRAD 1st IF CW
From: NL7VL [mailto:email@example.com]
Sent: Sunday, January 23, 2011 7:01 AM
Subject: Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable?
Did you get the install instructions for the INRAD roofing kit? There
are a couple different ways you can install it, one of which is to use
N1 or N2 soft switches to activate it. The other way, as it's installed
on mine (VI+), is to have the roofing filter installed full-time. I
have the 2.4K roofing filter.
On Sat, 22 Jan 2011 21:17:22 -0800
"Don Jones" <firstname.lastname@example.org> wrote:
>I just picked up a 1st IF 400Hz InRad Filter. Checked my OMNI VI
>manual and it says follow the instructions included with the filter.
>That helps a lot if you have those instructions. HI HI.
>When I purchased my OMNI VI (OPT 3) it had most of the optional filters
>installed, except for the narrow CW filter in the 1st IF. My VI does
>have the 4 pole InRad CW Roofing filter mod. Selecting the NAR button
>does activate the roofing filter.
>I am thinking the jumper switch next to the "optional filter" slot is
>the key. The jumper shorts two of the three posts together. How should
>that jumper be configured when I have a optional filter installed?
>Are there any other hidden configuration switches both hardware and/or
>Tna & 73,
>Don Jones KO7i
>TenTec mailing list
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