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Re: Possible communications black hole.
Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net>
These random "dead spots" are why good wireless access points have two
antennas, one may pick up a signal stronger than the other for a give
client. Look up wireless and "diversity" on google.
KEN
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, March 22, 2004 1:54 PM
Subject: Re: Possible communications black hole.
> Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
>
> At 08:06 AM 3/22/2004 -0700, you wrote:
> >Original poster: "Christopher 'CajunCoiler' Mayeux" <cajuncoiler-at-cox-dot-net>
> >I know it's likely to be something else, but is it
> >possible that my idle Tesla coil is causing a bit
> >of a communications "black hole" in my lab?
> >
> >I attempted to instigate wireless networking in
> >the lab (802.11b-at-2.4Ghz), and found there to be a
> >sharp drop in signal strength in a 4 foot radius
> >around my coil. (which is not plugged in)
> >
> >Is this at all possible? Or am I imagining this?
>
> You bet it's possible.. big metal thing, dimensions on the order of a
> wavelength or two, all kinds of weird stuff is possible. (2.4 GHz => 12.5
> cm wavelength) Of course, your body, and the antenna/laptop is also going
> to perturb the field.
>
> In some (exceedingly) casual experiments over the weekend, I was mapping
> the field strength on my kitchen table, trying to understand optimum
> orientation and position of the laptop when sucking down that first cup of
> coffee in the morning. There are 10-20 dB changes in field strength over
a
> distance of a few feet, and no apparent, obvious, pattern to it. (clearly,
> it fits in the "complex multipath environment" category)
>
>
>