ignorance is bliss. i don't plan to announce my arrival. a cigar pattern of radiation would be really hard to detect and probably would not interfere with other signals. i thought fcc based rules on transmitter power in watts? point well taken on db gain of antennae, though.
-----Original Message-----
From: Tanner Lovelace [mailto:[EMAIL PROTECTED]
Sent: Thu 3/27/2003 10:35 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [TriLUG] wireless bridge?
On Wed, 2003-03-26 at 20:06, Jim Ray wrote:
> I'm trying to get some NFR equipment from SMC for that purpose. They
> seem to stay out of stock. Me thinks some tuned Yagis or parabolic
> antennas with some Layer 2 hardware would make a sweet point to point
> connection with DS3 speeds and no major price tag. Life is good.
Note however, that depending on how it's setup, it can actually
end up being against FCC rules (for these unlicensed transmitters
that would be FCC Rules Part 15). Depending on how much gain your
antennas have, you'll need to make sure that the Transmitter Power
Output (TPO) is lowered 1dB for every 3dB of gain over 6dB that your
antenna gives you (note this is just point-to-point, rules for
point-to-multi-point are more stringent). To put this in other
words, if your antenna has 24dB gain (not an unreasonable figure),
that's 18dB over 6dB. If you have a 1 watt transmitter, you would have
to lower the power output by 18/3 or 6dB (1/4 watt) to stay within the
rules.
If you don't do this, you may or may not run into problems. The
FCC doesn't have that much personal to do enforcement but the do
act on complaints. Since the 2.4GHz band's primary user is Ham
Radio, it's very likely that someone there might complain if your
transmission is interfering with them.
Many people think that you can do anything you want in the unlicensed
2.4GHz band that 802.11b operates in, but unfortunately that's not the
case.
Note that one way you could run more power is by becoming a licensed
ham radio operator. The Part 15 power restrictions would then no
longer apply to you, but instead Part 97 (ham radio) would. The
downside to this is that a) you can't run anything commercial and
b) you can't use encryption (although you can use authentication)
while under Part 97 rules.
Cheers,
Tanner Lovelace
--
Tanner Lovelace | lovelace(at)trilug.org | http://www.trilug.org/
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