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From: mikey@trsvax.UUCP
Newsgroups: net.micro
Subject: Re: BRS home controllers and Cordless Ph - (nf)
Message-ID: <53400027@trsvax.UUCP>
Date: Thu, 24-May-84 10:41:00 EDT
Article-I.D.: trsvax.53400027
Posted: Thu May 24 10:41:00 1984
Date-Received: Fri, 1-Jun-84 01:23:56 EDT
References: <2421@ecsvax.UUCP>
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Nf-ID: #R:ecsvax:-242100:trsvax:53400027:000:1513
Nf-From: trsvax!mikey    May 24 09:41:00 1984

#R:ecsvax:-242100:trsvax:53400027:000:1513
trsvax!mikey    May 24 09:41:00 1984



The AC lines will radiate the carrier current signal to some extent, but not 
that much.  You can help the range of your cordless phone by making sure that
the AC cord is unwound and extended as opposed to coiled until it plugs
into the wall.  If you are in a house with foil lined insulation, stretching
the cord near a window can really increase your range.  If you put a cordless
phone in an office that has all the AC lines in conduit, the range will be
very short.  In this case, use an extension cord to the base set and stretch
it around the room.

The actual signal will travel throughout your entire area or household on the
AC lines until it hits a high impedence, such as your power transformer.  
The same thing happens with wireless intercoms.  Thats why you can use the
intercoms between some houses and not others.  It depends on wether you
share a power transformer tap or not.

Some universities use carrier current AM broadcast stations on their campus.  
To provide wider coverage, the power company can install RF bypasses to let
the RF get around the transformer.  You can drive all over the campus and pick
up the signal on your car radio from the RF leakage, but it will fade off to
nothing within 500 feet of campus, or the last power line.  Most of these 
college carrier current stations operate around 50 watts.

By the way, I believe the FCC still lets experimenters operate up to 5 watts
of carrier current without a license on one of the bands below the 535 khz.

mikey at trsvax