Article View: sci.electronics
Article #9190Re: Commercial radio transmitters
From: David J Bell
Date: Sun, 30 Dec 1990 08:33
Date: Sun, 30 Dec 1990 08:33
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1146 bytes
from Scott Dorsey/ Kaptain Kludge:
>If there are two towers for an AM station, I would expect it is because
>they are using a long antenna sling between the two towers. AM has a
^.... Hmm? Usually this was/is to allow ....^
directional control of the transmitted signal,
by feeding the two or more towers in particular
phase relationships.
>fairly long wavelength (600 ft. or even longer), so the antennae are
>much larger than those for FM.
^.... True. The towers are normally 1/4 wave verticals.
At 98 MHz, this is a LOT shorter than 1.1 MHz!
Dave dbell@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!fernwood!portal!cup.portal.com!dbell From: dbell@cup.portal.com (David J Bell) Newsgroups: sci.electronics Subject: Re: Commercial radio transmitters Message-ID: <37390@cup.portal.com> Date: 30 Dec 90 08:33:54 GMT References: <1990Dec20.172920.7325@phri.nyu.edu> <1990Dec21.135235.22887@cfctech.cfc.com> <1990Dec28.203208.2631@news.larc.nasa.gov> Distribution: na Organization: The Portal System (TM) Lines: 14