Ruth, and Radsafers:
The RF emission from an antenna is measured
in watts. The RF power density at some point in space is measured in watts/m2.
Any RF field is composed of an electric field component, measured in volts/m;
and a magnetic field component, measured in amps/m. One theoretically can measure the electric field, the
magnetic field, and/or the power density.
The power density is just volts/m times
amps/m resulting in watts/m2.
Hope this helps.
Regards,
Wes
Wesley R. Van
Pelt, PhD, CIH, CHP
Wesley R. Van Pelt Associates, Inc.
Consulting in Radiation Safety and
Environmental Radioactivity.
mailto://wesvanpelt@att.net
-----Original
Message-----
From:
owner-radsafe@list.vanderbilt.edu [mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of RuthWeiner@AOL.COM
Sent: Sunday, April 08, 2001 12:19
PM
To: radsafe@list.vanderbilt.edu
Subject: question about Vatican
broadcasting
Perhaps some RADSAFER -- especially perhaps a European
one -- could answer a
question that came up this morning in an article about the power of the
Vatican radio and TV transmitter. In the US, we measure RF transmitter
power
in watts, but according to this article, in Europe, this power is expressed
in volts/meter. Now, if I remember my elecricity and magnetism correctly,
1
watt = 1 joule/sec = 1 volt-coulomb/sec = 1 volt-ampere. So my question
is:
why "volts/meter", what are the "meters" referred to here,
and how does this
relate to watts? Is this perhaps because all the European countries do
not
have the same voltage and/or current available (though I don't know why that
would have anything to do with it)?
Thanks in advance
Ruth
Weiner, Ph. D.
ruthweiner@aol.com