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[Towertalk] fence update

To: <>
Subject: [Towertalk] fence update
From: (
Date: Fri, 16 Aug 2002 09:05:47 -0600
Have you ever driven into a Parking Garage while listening to
an AM BC station?  It practically disappears, even Local Stations.
The 'mesh' formed by the steel columns and rebar in the concrete
is nearly as effective as a shield room for long wavelength (low
frequency) signals.  For all intents and purposes, that mesh fence
can be thought of a a solid metal wall  (presumably grounded at
each fence post) at 3.5 MHz.

Tom  N4KG

On Thu, 15 Aug 2002 12:04:47 -0400 writes:
> Breaking up the fence with insulators would work on barb wire 
> etc...but this is a steel wooven inter-twined fence with wires 
> spaced apart about 5-6 inches on both sides and tops and 
> bottoms........thus there are several combinations of possibilities 
> of resonant lengths within shorter sections even if the length of 
> fence itself is cut and insulated in non resonant 
> sections-...................
> 73 Paul  N0AH
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