Does this URL, or any others do the same calculations for cell phones (or in
some
areas hand phones)? There has been a number of inconclusive reports about
operating the cell phone with antenna near the head. The one that I have
wondered
about is the pager. I think that some of the pager centres run about 100k
watts, are
near other transmitters such as TV, cells, various emergency transmitters and
cable
TV. What a site for intermods etc. The intermods should only increase with
split
spectrum devices.
So I guess what I am asking is what about all these other transmitters basic
and
working against each other?
Chris opr VE7HCB
From: "Tower (K8RI)" <tower@rogerhalstead.com>
To: "Arne Gjerning" <gjerning@flash.net>,
<hdmc38@bellsouth.net>,
"Todd Coulter" <coulter@bellsouth.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] RF exposure and my neighbor
Date sent: Sun, 27 Jun 2004 23:54:09 -0400
Copies to:
There is a site http://n5xu.ae.utexas.edu/rfsafety/ that has fill in
the blanks forms for RF levels. It's easy to use and allows "what if"
calculations. Just do a set for each band at your highest power
level. Conversely you can figure out just how high a power you can run
for a given distance.
I did them for all bands, but you will find you can get within a few
feet of simple antennas. Beams, or gain antennas OTOH at 20, 15, and
10 are a bit more sensitive.
Exposure levels are highly sensitive to frequency.
It works out that 2-meters is probably the most sensitive to RF
exposure levels. Here I can run the legal limit on all bands in the
"un-controlled environment" except for 2-meters where my calculated
limit into the array is only 380 watts. Being I'm only pushing 50
watts into 228 feet of LMR-400 I don't think I have much to worry
about.
Based on what we do know and what we don't, were it not for the
regulations it would probably be a non issue. The "non ionizing"
radiation exposure levels were calculated based on experiments that
may, or may not be all that representative of heating in the human
body. They came up with a value and multiplied it by ten to be on the
safe side.
Any one using an HT much far exceeds the allowable levels which don't
take effect below either 100 or 200 watts. So, last I knew if a
station only runs a basic rig without a power amp they don't even have
to figure exposure levels. That may have changed.
Roger Halstead (K8RI, EN73 & ARRL Life Member)
N833R, World's Oldest Debonair (S# CD-2)
www.rogerhalstead.com
> I was looking into this at work for a 2KW 5GHz system with 6ft
> dishes and located an FCC site that should be of interest. There is
> info relating to Amateur Radio Stations and it is very thorough (60
> printed pages). Do a search for FCC and within FCC site search for
> OET Bulletuin 65 Supplement
B.
> This will provide more than enough info and it has the calculation
> sheets required by FCC to determine RF Exposure. Lot of charts and
> tables. This same info in the ARRL RF Exposure info book.
>
> Hope this info will help.
>
> 73 de Arne N7KA
>
> ----- Original Message -----
> From: <hdmc38@bellsouth.net>
> To: "Todd Coulter" <coulter@bellsouth.net>;
> <towertalk@contesting.com> Sent: Sunday, June 27, 2004 7:30 PM
> Subject: Re: [TowerTalk] RF exposure and my neighbor
>
>
> > Todd
> > Try this link.http://www.n5xu.ae.utexas.edu/rfsafety/
> >
> > 73 Joe K4XZ
> >
> >
> > >
> > > From: "Todd Coulter" <coulter@bellsouth.net>
> > > Date: 2004/06/27 Sun PM 08:30:12 EDT
> > > To: <towertalk@contesting.com>
> > > Subject: [TowerTalk] RF exposure and my neighbor
> > >
> > > I am currently erecting a 51 foot tower and have not yet had
> > > time to
get
> > > the antenna and feed lines on the tower yet. My neighbor stopped
> > > me today and questioned me about the tower. His main concern was
> > > about he and his family being exposed to RF from the tower. I am
> > > looking for
good
> > > articles that I could print out and give to him about RF from an
amateur
> > > radio station explaining that he doesn't have anything to worry
> > > about.
I
> > > also plan on doing a RF exposure station evaluation as well.
> > > Any help on this would be greatly appreciated.
> > >
> > >
> > >
> > > Thanks,
> > >
> > >
> > > Todd
> > >
> > > N4JRZ
> > >
> > >
> > > _______________________________________________
> > >
> > > See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
> with
any
> questions and ask for Sherman, W2FLA.
> > >
> > > _______________________________________________
> > > TowerTalk mailing list
> > > TowerTalk@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/towertalk
> > >
> >
> > JOE PATRICK
> > SENIOR PLUMBING/MECHANICAL
> > INSPECTOR CITY OF BOYNTON BEACH
> >
> > _______________________________________________
> >
> > See: http://www.mscomputer.com for "Self Supporting Towers",
> > "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
> with
any
> questions and ask for Sherman, W2FLA.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers",
> "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
with any questions and ask for Sherman, W2FLA. > >
_______________________________________________ > TowerTalk mailing
list > TowerTalk@contesting.com >
http://lists.contesting.com/mailman/listinfo/towertalk >
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless Weather Stations", and lot's more. Call Toll Free,
1-800-333-9041 with any questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
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