Subject: (Dumpe) (Ozaktas) RF measure & estimate (fwd)
Date: Mon, 22 Mar 1999 102851 -0600 (CST)
From: "Roy L. Beavers" <rbeavers@llion.org>
To: emfguru <rbeavers@llion.org>
--------------------------------------------------
---------- Forwarded message ----------
Date: Mon, 22 Mar 1999 10:32:48 -0500
From: Bdumpe@worldbank.org
To: "Roy L. Beavers"
Subject: Re: (Ozaktas) RF measure & estimate (fwd)
Roy, Ozaktas: The SECRET is OUT!! Ozaktas, you found it: The federal
agencies of the USA DO NOT PROVIDE VALUABLE INFORMATION. They just write
books!
How else can they earn a living? Besides they would have every activist on
their head.
OET 65 is a **nothing** bulletin that presumably quels the public, and
satisfies what FCC is supposed to do -- i.e., publish the bulletin.
The microwave frequencies of cabbies and the dispatch station varies from
72 MHz to 936 MHz in the USA. The frequencies would be around the same
thing in Turkey.
Note that in between the said range, other devices function, for example
baby monitors whose signals have been picked up by the electronic controls
of airplanes. Hope this helps.
Bert
"Roy L. Beavers" on 03/22/99 08:20:29 AM
To: Emfguru
cc:
Subject: (Ozaktas) RF measure & estimate (fwd)
.......Haldun is asking for some specific info about a particular type
of equipment......
Roy Beavers (EMFguru)
rbeavers@llion.org................
...It is better to light a single candle than to curse the darkness...
.................PEOPLE ARE MORE IMPORTANT THAN PROFITS...............
---------- Forwarded message ----------
Date: Mon, 22 Mar 1999 12:46:04 +0300 (EET)
From: Haldun Ozaktas
To: rbeavers@llion.org
Cc: haldun ozaktas
Subject: RF measur & estim
Hello,
I have one question and one comment:
First the question:
What are typical power levels for the 2-way equipment used by
center-offices to communicate with taxicabs and dispatchers.
(or police patrols etc.)
-What is the power of the central-office transmitter?
-What is the power of the transmitter in the vehicle?
-What frequency band(s) do they operate on?
The antennas I saw are simple flexible vertical wires on the
roof, perhaps a few meters long. Much like a long car radio antenna.
The gain of these must be very low.
And the comment:
Following recent mention of OET Bulletin 65 on how to determine
compliance of transmitting facilities with official human
exposure standards I downloaded it and studied it carefully.
(http://www.fcc.gov/oet/info/documents/bulletins/#65)
Of course, official exposure limits are in the milliWatt/cm2 range.
I concluded that this document is virtually of no use for
purposes of determining exposures in the microWatt/cm2 range
or below. I tried hard to see if any useful information can
be extracted, extrapolated from the formulas or graphs. But
there seems to be nothing useful that cannot be deduced
from the formula
Intensity = EIRP/(4pi R^2)
to begin with.
Thus it seems this document is of no use to most people on this list.
Many thanks and best,
Haldun
________________________________________________________________________
Haldun M. Ozaktas (90) (312) 290 16 19
Bilkent University (90) (312) 266 43 07 (secretary)
Department of Electrical Engineering (90) (312) 266 41 26 (fax)
TR-06533 Bilkent, Ankara, Turkey haldun@ee.bilkent.edu.tr
www.ee.bilkent.edu.tr/~haldun haldun@alumni.stanford.org
Archive provided courtesy of WaveGuide, http://www.wave-guide.org
Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html