Anyone who feels 250 Hz filters are unnecessary should try contesting on 40m
in Europe, where the entire band is just 100 kHz wide (though it's in
process of expanding now).
I regularly ran both 250 Hz filters on my Omni VI+ during CQWW CW, etc., on
40m. I probably never ran both on 20m or above, but I did often use one on
these bands.
Most of the time, when casually working the bands, not contesting, I only
use 500 Hz.
Clearly, its "horses for courses". If you don't need em, don't buy them,
but please don't try to convince the manufacturers that nobody else needs
them, because that is clearly wrong!
The nice thing about the Ten-Tec rigs is they enabled the choice of so many
filters. Before the Omni V came out, that was very rare.
73
Rick,
NJ0IP / DJ0IP
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Ken Brown
Sent: Sunday, October 21, 2007 5:36 PM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] Purpose of 250 Hz 8 pole filters
> Another viewpoint: I have both filters (500 and 250) in my Corsair
> II, and found that I never used the 250. Too narrow for comfortable
> tuning, and if I couldn't isolate a signal in the 500 hz bandpass it
> wasn't worth the aggravation anyway.
>
>
This is sort of my experience too. I do use the model 221 six pole 250
Hz filter in the 9 MHz IF a lot. However the model 282 in the 6.3 MHz
IF never gets used . Using the 250 Hz 8 pole filter "interferes" with,
or detracts from, my own ability to discriminate between
noise and CW signals. I found I was also not using the 250 Hz filter in
a FT-1000 this weekend for the same reason. It seems like the main
purpose of a 250 Hz 8 pole filter is to use it to demonstrate that you
don't really need a filter narrower than 500 Hz. This is for human
copied CW, there may be practical application of the 250 Hz filter for
other modes.
DE N6KB
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