I used to run two 250 hertz filters in my Omni V. It worked very well.
With PBT, you can get the effective passband as narrow as you want this way.
This helps the signal to noise ratio for very weak signal enhancement.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Jim Brown" <jim@audiosystemsgroup.com>
To: <tentec@contesting.com>
Sent: Friday, August 06, 2004 9:01 PM
Subject: Re: [TenTec] NAR filter in Omni VI
> On Fri, 6 Aug 2004 16:02:50 -0400 (EDT), jsb@digistar.com wrote:
>
> >
> >I have an Omni VI with 2.4K, 1.8K, 500 and 250hz filters but the NAR slot
> >is empty. Can someone tell me what I would add to the NAR filter for CW
> >operation and why would I want to do this when the filters that are
> >already there seem to work real nice.
>
> That's a really good question, Jason. I've made very careful (and fairly
precise)
> spectrum measurements of my Omni V (just back from factory alignment) with
> exactly that set of TenTec filters , plus a 500 Hz Ten Tec filter in the
NAR
> position. The addition of the 500 Hz NAR filter to the 250 Hz filter makes
a
> difference so slight (on the order of 3 dB in the skirts) that you wonder
why you
> bothered. A 250 Hz filter in the NAR position (which I have not measured)
would
> likely make enough difference to matter, but that's REAL narrow. If you're
a
> serious contester or DXer, that might be worth doing. I would expect the
> results in your Omni VI to be the same as in my Omni V.
>
> I have not compared the InRad filters to the Ten Tec filters, but I just
put InRad
> filters in the 746 that I use on 6m, and I am quite pleased. They are a
significant
> improvement over the Icom filters, and sell for about the same price.
Maybe
> someone can comment on InRad filters in your Omni VI.
>
> Jim Brown K9YC
>
>
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