Re: Tunnel Radio (was reception)

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Article #986

#986

From: Isaac S Wingfield
Date: Thu, 27 Jul 1989 06:23

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>       Does anyone know exactly **how** they accomplish this? The
>"every AM channel" system is used in Boston (in the sort-of-tunnel
>under Copley, and in the Callahan and Sumner tunnels)....               

Hmmm... I don't suppose it could be as simple as transmitting
on the receiver's intermediate frequency, could it?

Back when car radios used "FET's with wicks", just about all
of 'em had the same IF (I think it was 262.5 kHz). I don't
know if contemporary units are so standardized.

In any case, if there is only one frequency in use, sending
a signal on it should get through to everyone.

Isaac     isw@cup.portal.com

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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!cica!ctrsol!ginosko!uunet!portal!cup.portal.com!ISW

References: <Jul.19.14.48.15.1989.439@athos.rutgers.edu> <81@vax87.auc.dk> <3890@phri.UUCP> <1566@unccvax.UUCP> <2463@cpoint.UUCP>

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!cica!ctrsol!ginosko!uunet!portal!cup.portal.com!ISW
From: ISW@cup.portal.com (Isaac S Wingfield)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: Tunnel Radio (was reception)
Message-ID: <20786@cup.portal.com>
Date: 27 Jul 89 06:23:45 GMT
References: <Jul.19.14.48.15.1989.439@athos.rutgers.edu> <81@vax87.auc.dk>  <3890@phri.UUCP> <1566@unccvax.UUCP> <2463@cpoint.UUCP>
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Organization: The Portal System (TM)
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