Re: Practical way for partial blocking of radio wave
- From: mpm <mpmillard@xxxxxxx>
- Date: Wed, 17 Oct 2007 20:28:05 -0700
On Oct 17, 1:45 pm, Maya <maya_s...@xxxxxxxxxxx> wrote:
I live in an area where the only Internet access I can get is through
my mobile phone provider's (Sprint) EVDO network. I use a D-link
Kyocera KR1 EVDO router to get Internet access through my computer
(CAT5 cable from router to computer).
http://www.kyocera-wireless.com/kr1-router/tech-specs.htm
Because my apartment is so small, the only practical place to position
the KR1 is on a shelf about 18 inches away from my head. I know that
long-term exposure to cell phone radiation is probably harmless to me,
but I think the KR1 puts out a much stronger signal than a cell phone.
I'm wondering, does it sound practical to place a 6" x 10" piece of
cardboard covered in aluminum foil about 1 inch from the KR1, in
between the KR1 and my head, with the purpose of interfering with the
radio waves (blocking them?) in that particular direction?
I believe my Internet access would be unaffected, because the KR1
would still more than 75% of a "sphere of radiation" to propagate its
signal.
Would such a setup potentially "block" radio waves in the way that I'm
thinking? (Or have the waves already messed up my thinking?)
Thanks in advance.
Here's the relevant RF Safety page at the FCC web site:
http://www.fcc.gov/oet/rfsafety/
Equation 3 on Page 19 of the document is the simplified approach to
your question.
Because the power is low, and it's divided by the square of the
distance, the power density rolls off in a big hurry.
Plus, the RF losses due to non-resonance at 2.4 GHz are enormous.
.
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