[1000mp] cw fiters

Sat, 1 Nov 2003 20:37:45 +0100

Hello Tom,

You are very right about the WIDTH control! Thanks for your supplementary
comments.

I have the same combination of filters in my 1000D as you have.

In the Mark V I use a combination of 1000 and a combination of 400 Hz for
CW. During contests I find the 1000 Hz filters very useful.

73, Hans Remeeus.
Ham Radio: PA1HR
www.remeeus.nl

Communication is about people, the rest is technology.

----- Original Message -----
From: "Tom Rohlfing" <[email protected]>
To: <[email protected]>
Sent: Saturday, November 01, 2003 7:32 PM
Subject: Re: [1000mp] cw fiters

> Don't forget one more advantage to having a matched pair of filter
> bandwidths--one in each IF.  The WIDTH control work much more effectively.
> This is because you have coincident edges of the two filters to shave off
> either side of the input spectrum when you move the WIDTH control.  If you
> have a 400 Hz. filter in one IF, and a 2.4 KHz. filter in the other IF,
then
> the WIDTH function doesn't work so well.  So under heavy QRM, a matched
pair
> of steep filters is hard to beat.
>
> If you don't use WIDTH, it isn't quite so important.  All you are doing is
> getting steeper skirts with a pair of filters.  But the WIDTH is a pretty
> effective tool, so for me it's worth it to have a matched pair.
>
> Having said that, I have an "almost" matched pair (400Hz Inrad and 500Hz
> stock), plus a pair of 250Hz. Inrads.  I like the combination.
>
> 73,
> Tom / W7GT