[ RadSafe ] Non ionizing radiation: VHF repeaters

[Jim Darrough]

And pardon me for butting in, but aren't the limits that are now in force
based on a presumption of injury rather than documented damage? I know that
large microwave exposures are very lethal however, the limits now imposed
which reference very small amounts seem to be conjecture.

My 2 cents worth.

Sincerely, Jim Darrough

KI7AY

James E. Darrough
Health Physicist
Oregon State University Radiation Center



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Emer, Dudley
Sent: Wednesday, July 03, 2013 12:04 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Non ionizing radiation: VHF repeaters

It depends on where you're at - in a controlled or uncontrolled environment
and the proximity to the RF source.  Although exposure limits are based on
the field strength of the E and H field guidelines for keeping a safe
distance have been established based on frequency, power and antenna gain
for controlled and uncontrolled exposures to make compliance easier.
For the US exposure limits see:
http://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins
/oet65/oet65b.pdf
http://www.arrl.org/rf-exposure
A typical VHF ham repeater is usually 50 watts and would use a 3-6 db gain
antenna which would be roof mounted (uncontrolled).  
It would be unusual for a ham repeater to be of concern with regard to EMF
exposure unless you sat next to the antenna.

Dudley Emer  KK7IF
Geophysicist
National Security Technologies, LLC (NSTec) National Center for Nuclear
Security Nevada National Security Site, Mercury, Nv U.S. DOE Contractor
702-295-7808 office
702-794-5824 pager
702-343-6208 cell
email: emerdf at nv.doe.gov
Mailing address:
P.O. Box 98521
M/S NNSS 980
Las Vegas, Nv 89193-8521

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Colette Tremblay
Sent: Wednesday, July 03, 2013 11:11 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: [ RadSafe ] Non ionizing radiation: VHF repeaters

Hi, can a VHF repeater (146 MHz, used by an amateur radio club) be of any
concern regarding EMF exposure? Thank you.

Colette Tremblay,
Radiation Safety Officer
Service de sécurité et de prévention
2325, rue de la Vie-Étudiante, local 1533 Pavillon Ernest-Lemieux -
Université Laval Québec (Québec)  G1V 0B1
418 656-2131, poste 2893




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