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Path: utzoo!watmath!clyde!bonnie!akgua!whuxlm!harpo!decvax!ulose!bob
From: bob@ulose.UUCP ( Bob Bismuth )
Newsgroups: net.aviation
Subject: Re: Need technical info for VOR
Message-ID: <106@ulose.UUCP>
Date: Sat, 8-Jun-85 09:50:59 EDT
Article-I.D.: ulose.106
Posted: Sat Jun  8 09:50:59 1985
Date-Received: Mon, 10-Jun-85 07:45:34 EDT
References: <2965@hplabsb.UUCP>
Organization: CADMUS Computer Systems, Lowell, MA.
Lines: 21

No, the VOR station does not have 360 seperate antenna elements. It has 5.
There is one central element and 4 elements surrounding it, each of which
radiates in a figure 8 pattern. They are all broacasting a signal modulated
at 30 Hz. Elements across a diagonal are modulated with a phase difference
of 90 degrees, and each pair of diagonals differs by a phase angle of 90
degrees. The central element broadcasts the reference modulation.

The result is, if I understood it correctly, the effect of 2 signals whose
phase relationship varies according to your position relative the the
station, ie. what "radial" you are on.

If you want to pursue an interest in how the electronics of aircraft work,
there are several good books on the market. The one sitting on my bookshelf
is "Aircraft Electricity and Electronics" by Bent/McKinley, published by
McGraw Hill. It costs arround $30 and is intended as a testbook for those
studying for A&P type qualifications.

	--  bob
	    (decvax!ulose!bob)

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