Subject:  Is this part of Sutro??? (Bowling)(Schuyler)(Philips)..
Date:     Sat, 27 Nov 1999 125625 -0600 (CST)
From:     "Roy L. Beavers" 
To:       emfguru 
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---------- Forwarded message ----------
Date: Sat, 27 Nov 1999 19:02:52
From: Alasdair Philips 
To: "Roy L. Beavers" 
Subject: Re: Is this part of Sutro??? (Bowling)(Schuyler)..

A point of info from the UK:
We have some 500 kW long-wave AM transmitters and quite a lot of
200 kW Medium waveband AM transmitters. I would be surprised if
other countries didn't also have such high powered AM transmitters.
50 kW on Short-Wave band may be about maximum.
The 500 and 200 kW transmitters ARE mainly near centres of population.
Cheers
Alasdair


>Jim Schuyler of STAC replied:
>
>It is very common for a "clear channel" radio station such as KGO to be
>received all over the continent and further (at night), due to the way
>low frequency AM radio signals propagate.  Same is true of many
>commercial stations in the midwest, and the east.  I think that 50kw is
>about as high a power as is permitted for AM broadcast...and probably all
>that's actually needed to reach most of the nation at night.  During the
>day you wouldn't be able to receive KGO, of course, unless the signal
>goes thru a ``repeater,'' which is common for FM and for TV.
>
>Amateur radio operators, who are increasingly aware of potential EMR
>problems, communicate around the world on 100 watts radiated power (at
>higher frequencies than commercial AM).  When I was first licensed (I'm a
>part of the civilian emergency response teams here in SF and that's the
>only time I use it) I remember old ``hams'' holding a 60 watt bulb in
>their hands (not plugged in), near a transmission line (going to an
>antenna) and watching the bulb light up.  Reminds one of the Curies
>x-raying their hands.  That would not be common practice today - hams are
>very aware that there might be a hazard here and keep to the lowest
>operating power necessary to achieve the desired result - in fact that's
>the way the regulations read.
>
>[.......guru says:  It is largely because of the efforts of Dr. Sam
>Milham, of this list, that the "regulations" regarding the operation of
>HAM radios have been tightened......]
>
>It is primarily FM and TV coming off of Sutro that causes problems for
>locals, and the range of pure EMF interference with garage door openers,
>car alarms, TVs, radios, phone, is probably around a half mile.
>Bio-interactions, of course, unknown. 
>
>-----------------------------------------------------------
>Sutro Tower Action Committee
>An action group providing information regarding Sutro Tower 
>expansion, safety, and community issues.
>http://www.sutro.org/              EMail to: stac@sutro.org
>
>
 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alasdair Philips,   BSc(Eng), DAgE, MIAgE
Director, UK Powerwatch, (aphilips@gn.apc.org)
EMC Engineer and EMF-bioeffects researcher
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




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Reprinted with permission of Roy Beavers, http://www.emfguru.com