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From: mmm@cup.portal.com (Mark Robert Thorson)
Newsgroups: misc.wanted,sci.electronics,rec.audio
Subject: Re: Magnetic Wire Recorders
Message-ID: <31710@cup.portal.com>
Date: 14 Jul 90 16:41:07 GMT
References: <1990Jul14.044030.6001@swbatl.sbc.com>
Organization: The Portal System (TM)
Lines: 8

During WW2, my dad worked in naval intelligence searching for Japanese subs
by listening for their radio transmissions.  They'd use direction finders
to get a vector to the transmitter, and triangulation among multiple
listening posts to find the location.

This work was made more difficult by the wire recorders used by the
Japanese.  They'd record a message in something like Morse code, then
play it back in a high-speed burst for transmission.