Barry,
I guess I'm guilty for doing what you dissagree with and I
(respectfully) dissagree with you.
I investigated doing this one year ago and then decided to drop
the idea after reading servral posts here on this reflector. I
won't bother with all of them. Just have a look at what Jerry
said in the post (url) below. After reading that and thinking
about it for a while, I dropped the entire idea. All I did to my
OMNI was add the capability of using a preselector with it. I
used a Braun and sometimes the BCC preselectors quite
successfully for many years. Read the [long] post and then see
if you still disagree with me. BTW, if you read all of the posts
associated with this one, you will see that George (INRAD) was
involved and the results of the narrower OMNI VI roofing filter
were indeed negligable. Finally, YES, it is second hand info
because I never tried it. I dropped it after reading this. 73 -
Rick
http://lists.contesting.com/archives/html/TenTec/2003-06/msg00534
.html
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Barry N1EU
Sent: Wednesday, February 11, 2004 7:47 PM
To: tentec@contesting.com
Subject: [TenTec] Omni6+ mods: 125hz cw filter and 2 khz roofing
filter
I respectfully disagree with the 2nd hand accounts
that a narrower roofing filter in the Omni VI+ shows
no benefit. I don't know what those sources of
information were.
The only person I know to have conducted such tests
was George W2VJN at Inrad. I remember him finding a
substantial improvement (I can't find the exact
numbers) when replacing the 15khz filter with a
ssb-width filter and using 50:200 ohm matching xfmrs.
He also suggested trying a cw-width roofing filter,
with a gain stage if necessary. I believe other
projects pulled him away from any further work and I
shuffled rigs before getting a chance to implement it.
73,
Barry N1EU
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