[Top] [All Lists]

Re: [TowerTalk] Shields

To: "John Kiesel" <>,<>
Subject: Re: [TowerTalk] Shields
From: "Tom Rauch" <>
Reply-to: Tom Rauch <>
Date: Tue, 12 Oct 2004 22:08:04 -0400
List-post: <>
> stayed away from the center conductor??? I don't know.
> But having good shielding is very important, I do
> know!

What's so special about a shield? If currents are equal and
opposite and conductors are very close, you don't need a
shield at all to prevent radiation at any distance.

I can have a 100ft long piece of twin lead with no shield at
all connected to my FT1000D with preamp on, and not hear a
signal at all on 80 meters. As a matter of fact I had a 2500
foot long homebrew open wire feeder, and could only just
barely detect signals in the noise on 80 meters when it was
terminated. There wasn't a shield on that transmission line

One thing for certain, you certainly do need a jacket when
the weather is that cold!

73 Tom


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>