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From: williams@kirk.DEC (John Williams 223-3402)
Newsgroups: net.physics
Subject: Low frequency RF
Message-ID: <3202@decwrl.UUCP>
Date: Fri, 19-Jul-85 10:30:02 EDT
Article-I.D.: decwrl.3202
Posted: Fri Jul 19 10:30:02 1985
Date-Received: Sat, 20-Jul-85 12:26:11 EDT
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	Yes, You can transmit audio electromagnetically, but there are
two problems:

1) You need more amplitude to establish a certain field strength at
low frequencies, which can be measured as Volts/meter along the length
of the antenna.

2) At low frequencies, signals are absorbed by metal objects. A tremendous
amount of energy would be dissipated by mechanical vibration.

	The second is the most important effect, and makes transmission
impractical at low frequencies except within the confines of a transformer.

						John Williams