David --
Suggest you take a look at the attached paper by Jim Brown. I live in a fairly
dense suburb where every house (including mine) has all the latest RF
noise-makers. Following Brown's suggestions, I've put large 31-material
clamp-on ferrites on both ends of my receive antenna feedlines (and sometimes
one in the middle), and it makes a very clear difference.
Regards,
Art Delibert, KB3FJO
________________________________
From: Topband <topband-bounces@contesting.com> on behalf of Rodman, David
<rodman@buffalo.edu>
Sent: Tuesday, October 23, 2018 6:41 AM
To: topband@contesting.com
Subject: Topband: Common Mode
I purchased some 7mm dia snap on cores for RG6 receive antenna coax. I was
wondering if anyone had any experience or suggestion as to how many one would
place on each lead. The feed lines are about 50% on the ground with grass
growing over or buried 2-3". The lengths vary from 300' to 750', depending on
the antenna I am using for listening. I was planning to place them inside the
station. I have nothing now and thought this would be acceptable versus
removing connectors and placing beads? Thank you.
---
David J Rodman MD
Assistant Clinical Professor
Department of Ophthalmology
SUNY/Buffalo
Office 716-857-8654
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