If one has a good antenna analyzer that reads both R and X, and you collect
enough frequency points, you can calculate what a TDR would have given you.
The Fourier transform is used to convert back and forth between time domain
and frequency domain.
Looking for dips in frequency domain is essentially a special case of this
duality. You're looking for places where the time delay for an impulse to
propagate from one end to the other happens to be an exact multiple of one
RF period.
----- Original Message -----
From: "Frank Donovan" <donovanf@erols.com>
To: <towertalk@contesting.com>
Sent: Monday, March 14, 2005 8:23 PM
Subject: Re: [TowerTalk] phasing antennas
> Hi Gregg,
>
> Can you borrow a time domain reflectometer? They are widely
> available these days because of their relatively low cost and
> widespread use in the wireless and CATV industries, among others.
>
_______________________________________________
See: http://www.mscomputer.com 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.
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