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Re: [TowerTalk] RF Inquiry HI-Q Filter CF5KV?

To: "Kelly Taylor" <ve4xt@mb.sympatico.ca>,<towertalk@contesting.com>
Subject: Re: [TowerTalk] RF Inquiry HI-Q Filter CF5KV?
From: "Tom Rauch" <w8ji@contesting.com>
Reply-to: Tom Rauch <w8ji@contesting.com>
Date: Sun, 20 Feb 2005 10:18:49 -0500
List-post: <mailto:towertalk@contesting.com>
> Aside from wondering about anybody who can't be bothered
to read his ad
> before posting it, this product looks an awful lot like
Radioworks' T4 Line
> Isolator, the most expensive of which is $43.95.
>
> I'm not sure that any didderence would be worth an extra
$50.

I just measured a Radioworks isolator and it isn't anyplace
even remotely close to the common mode isolation impedance
they publish.
The Radioworks isolation impedance runs from several hundred
ohms over lower HF to a peak of less than 2000 ohms up
around ten meters. That's a far cry from the claimed (and
impossible to achieve over multiple bands) 50K ohms.

73 Tom

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