Re: High gain antennas health problems?

On Fri, 6 Jul 2007 04:14:39 -0400, divine chakra
<divine.chakra.2tajcx@no-mx.wirelessforums.org> wrote:

>Hi I just bought 15dbi high gain omni directional antenna '2.4 GHz 15
>dBi 802.11b 802.11g Wireless LAN and Bluetooth® Compatible
>Omni-Directional Professional Wi-Fi® Antenna'
>(http://www.hyperlinktech.com/web/hg2415u_pro.php)
>And I was wondering if mounting this antenna close to me or on the roof
>(working 24/7) would result in brain damage or health problems for me or
>my kids? I know that normal wifi antennas don’t make problems but this
>one is high gain 15 dbi…….. Thanks

Were you planning on pointing it at anywhere inhabited? Such
directional antennas are only dangerous in the direction they are
pointed. The RF levels are MUCH less outside the main beam lobe.

For the FCC official RF safety calcs, see:
<http://www.wirelessconnections.net/calcs/rfsafety.asp>
<http://n5xu.ece.utexas.edu/rfsafety/>
<http://www.wirelessworlds.com/rfsafety.main.cgi>

Plugging into the first one yields 0.313 ft for a 100mw xmitter. I
think you're safe at any position or location.

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

most antrennas broadcast a vertical signal horizontally from the antenna ( horizontally if the antenna is a vertical rod)

therefore the amount of downward transmission (if you're under it) is negligible - yes you will pick it up but most of the signal will go sideways above you, only slowly dipping to earth.

As a Radio Ham, I frequently radiate hundreds of watts (not hundreths from wifi) from antennas above my head ---- no way would I if there were any risk whatsoever.

Provided the antenna is above you or at least a couple of meters away if level with you - there should be little chance of a problem

However, if you feel your genital getting warmed up - move the antenna
I know that sounds odd but the genitals are very sensitive to wireless heating effects - if you take notice of them - its noticeable with a wireless notebook on you lap.