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Re: [TowerTalk] Shields

To: "Daron J. Wilson" <>
Subject: Re: [TowerTalk] Shields
From: "Tom Rauch" <>
Reply-to: Tom Rauch <>
Date: Tue, 12 Oct 2004 21:55:05 -0400
List-post: <>
> Tom I'm not questioning your experience or testing, but
what are the
> manufacturers of duplexers missing?  They seem to think
that double
> shielded coax on their harnesses is of some value.  I
would think it if
> made no difference, they would use less expensive

I don't know that they think anything. Many times I've
decided to do something that isn't necessary simply because
people (through popular opinion) think it is necessary. It
isn't worth spending dollars being right to save a few
pennies. I can prove the cable to cable isolation of typical
RG8X exceeds the notch depth of the cavities and the loss in
the duplexers is significantly higher than any loss in
jumpers, but I'm sure customers would have a fit about
seeing RG8X.

The duplexers I have cost 1400 bucks, and use six feet or
less of cable with UHF connectors at each end. I don't think
they broke the bank in cable cost. I bet if they lost ten
customers ($14K gross), they'd never come close to making
the savings up.

For an example of this thinking, look at trap dipoles.
Almost no one builds them commercially, because we have it
drummed into our heads that "traps are lossy". The fact is
even mediocre traps have less loss than the alternatives
some manufacturers use.
Look at linear loading and low band yagi's. Same story.

You just go with the flow, that's where the profit is.

73 Tom


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