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Old August 11th 08, 09:28 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default Blackberry power level 4.9GHz

You wrote:

...
Sonny, you seem to be using the Inverse, of the Inverse Square Law
here.... the Farther the source is from the receiver the LESS power
reaches the receiver, not MORE. It goes Down, by the SQUARE of the
distance, not up. You also don't get ALL of the 300 Milliwatts
going into your head as the antenna is semi Omni-directional and
only about 120 degrees of the 360 degree transmitted signal will
intersect with your head, and another maybe 10 degrees with you hand.
Better go back and do the Sums, AGAIN, or leave it to folks that
passed Jr. High School Math, and High School Physics.


Or, to simplify, once again, 300mw@6mm ~= ... re-read my
posts, you (that is your "name", right? grin) missed it!

However, I have rethought those distances, since, I now realize the
antenna in the phone is much closer to my skull than I had first
thought; here is the "new breakdown":

3mm@300mw =
=
=
=
=
=

19.2cm ~= ~7.5-inches

Anyway, point is, when I use my cell phone without a headset, that spot
on my head, directly under the cell phones' antenna, is getting the same
exposure as it would get from a 1.2288KW source utilizing the same
antenna, and at a distance of 7.5 to ~15 inches from my head! (realize
the importance of that 19.2cm/7.5-inch vs. 1.2288KW figure!)

Anyway you cut that--it ain't pretty! My wife, frequently, makes 2+ hr
calls to family! Did that help?

Now, anyone want to explain the "yellow journalism" in that to me?

Regards,
JS
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Old August 11th 08, 10:31 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Nov 2006
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Default Blackberry power level 4.9GHz

John Smith wrote:

...
Now, anyone want to explain the "yellow journalism" in that to me?

Regards,
JS


Here are complete disassembly instructions for my phone, the one in
question. The antenna IS NOT where the "kid" (well, he was much younger
than me grin) at "the cell phone place" told me it was ... indeed, it
is UNDER MY HAND while I hold the phone! (actually, between head and
hand!--nice for efficiency, huh?--probably drives it towards that 300mw
all-the-more-quicker!) (so much for "placing the antenna logically!")

Now I am thinking the area of highest exposure, on my head, is my
cheek/nose/upper-gum-area ... and, this makes the area of the phone
containing the antenna further from my head; and the equivalent
distance to a 1+KW source is much further, feet away instead of inches
.... but, I would be hesitant to remain in my garage with I in one corner
and an "omni-directional, Cooking Band(CB), frequency generator" of 1+KW
in the other corner! -- But then, that is just me ... (and the phone is
a MUCH closer danger than that ...)

That all changes little in my mind. Although I really do not sweat HF
RF, much, I would still be hesitant to expose myself to levels of it of
those intensities in question FOR the length of time(s), and that
frequently, as is in question, however, if the need arouse, I'd probably
do it ... at VHF/SHF I WOULD NOT! And, especially to those freqs in the
CB Bands (Cooking Bands grin)

It would take "extreme motivation" for me to ignore the "prudent man
rule"; but, even that is possible ...

I am sorry if this has been a source of "yellow journalism", to me, they
seem honest mistakes/bad-data, but I admit, the mistakes do not help ...
my original point seemed "so harmless", "be prudent/cautious" :-(

Tell you what, consider all this just "One Mans' Opinion", gather your
data and then you decide ...

Regards,
JS
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Old August 11th 08, 10:45 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default Blackberry power level 4.9GHz

John Smith wrote:

...
Regards,
JS


Oh yeah, the disassembly instructions:

http://uselessinfo.pwp.blueyonder.co.uk/dismantlev3.htm

Regards,
JS
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