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From: carroll@bcsaic.UUCP (Jeff Carroll)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: naive question about RF propagation
Message-ID: <19106@bcsaic.UUCP>
Date: 18 Jan 90 07:25:10 GMT
References: <28774@amdcad.AMD.COM> <480ec7fd.15840@valley.UUCP>
Reply-To: carroll@bcsaic.UUCP (Jeff Carroll)
Organization: Boeing Computer Services AI Center, Seattle
Lines: 15

<Mike Pflueger tells about Professor Kraus' solution to carrying
broadcast signals in tunnels using a wire extending beyond the end of
the tunnel...>

	Yup. Never thought about it myself, but that's a great idea.
It'd be topologically equivalent to a coaxial cable, which has no cutoff
frequency for the TEM mode.

	Now *here's* an interesting question, particularly for anyone
like me who has spent half an hour in a tunnel during a traffic jam:
Why do we allow tunnels to be built without such gizmos installed in
them?

	Jeff Carroll
	carroll@atc.boeing.com