Date: Sun, 18 Aug 2002 13:14:51 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: fscked@pacbell.net Cc: mobile@FreeBSD.ORG Subject: Re: 802.11b antennas Message-ID: <20020818.131451.51626124.imp@bsdimp.com> In-Reply-To: <3D5FD938.19F2D00E@pacbell.net> References: <3D5E98FF.82CD061E@pacbell.net> <20020817.141537.108956335.imp@bsdimp.com> <3D5FD938.19F2D00E@pacbell.net>
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In message: <3D5FD938.19F2D00E@pacbell.net>
richard childers <fscked@pacbell.net> writes:
: offer 2.4 GHz antenna boosters (PN 174748, 179872), a high-gain
: directional antenna (or is that redundant? - PN 174721), and
: something called a '2.4 GHz SMA RF Antenna' (PN 179864) that looks
: like it might fit onto some of the WAPs I've seen (but I'm not sure
: what 'SMA' refers to).
SMA is a type of connector. Often times you'll see SMA or N in the
product description to tell you the connector you need to connect to.
The booster may be anything from a simple omni antenna to an
amplifier.
: Note that none of this equipment was originally made for
: 802.11b-specific markets and that careful reading of the device and
: antenna specifications, paying attention to ohms and milliamps and
: such, is indicated.
Antennas don't care what protocol you are talking over. I really
doubt that 802.11b vs non-802.11 makes one wit of difference.
: I haven't looked recently but NASA Tech Briefs (the magazine) is a
: great source of space-age supplies (duh :-); specifically, things
: like EMF shielding materials and the like. Warner, you might want to
: check them out WRT tin foil equivalents.
All I know is that wrapping my lucent card in tinfoil didn't keep it
from interferring with other 802.11b equiptment in the house. Didn't
do any calculations, but it seemed to attenuate things by only 2dB or
so, but that could easily be in the noise.
: I went looking for the 802.11b specifications and encountered
: indications that they are accessible only to IEEE members. Anyone
: have a URL to a public copy? (That goes for all of 'em;
: 802.11[a-z].)
All the ieee standards are available from:
http://standards.ieee.org/getieee802/
I've grabbed them many times. You have to agree to the terms and
conditions, but then you get nearly all the relevant stuff. (802.11g
isn't available yet that I could see, but that's not too relevant).
Warner
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