[TriLUG] wireless bridge?

[Jim Ray]

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:lovelace at trilug.org] 
	Sent: Thu 3/27/2003 10:35 AM 
	To: trilug at trilug.org 
	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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