Date: Thu, 15 Apr 2004 05:13:55 -0500 From: Nikolas Britton <freebsd@nbritton.org> To: freebsd-newbies@freebsd.org Subject: Re: Going small Message-ID: <407E6063.5030505@nbritton.org> In-Reply-To: <407DDCA7.1010201@nbritton.org> References: <3a8q70tlt97mcr8llt61ff158gtudful25@4ax.com> <20040414155534.GJTI1202.mta04-svc.ntlworld.com@deskgx> <pfvq701tp6kq30n6q5bad331ig821evjjr@4ax.com> <407D88BA.80200@nbritton.org> <9p5r70d2ph3g2aq0o07lb8slpa81h87p81@4ax.com> <407DDCA7.1010201@nbritton.org>
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This is a follow up to my way off-topic rant about the guy down the street. :-) Forgot to calculate for cable loss, pig-tails, removel of old ant., etc....but even with this factored in this guy is still way over the legal limits. this link should clear up everything I was talking about: http://www.ydi.com/deployinfo/wp-decibels.php?screen=print oh...btw the 300m range I quoted is real world at 11mb. I'm going 183m from the inside of one building to a stock Linksys WET11 point on the outside of another building with a heavy tree line on one side (plus a few braches in the way) and only one of its ant. directly pointed at it, the other is halfway pointed at another spot about 125m away from the WET11 and 33m away from the WAP11, giving it a coverage area of about 90 degrees. Nikolas Britton wrote: > John Murphy wrote: > >> Nikolas Britton <freebsd@nbritton.org> wrote: >> >> >> >>> m0n0wall will run from a HD aswell as a CD-ROM/Floppy >>> >> >> >> Sure, but I'll be happier with the (becoming more) familiar full >> FreeBSD and may even try current :| >> The php/XML speak was foreign to me too. >> > I think your missing the whole point about m0n0wall... > > I guess maybe it's one of those things you have to try before you > understand it. In the period of time I have been using it (1 year) I > have spent a total of about 1 hour to setup AND maintain this box. The > box is entirely managed through a web based interface > (http://www.m0n0.ch/wall/screenshots.php), the only time you use the > console is to setup the network cards at first boot (the box I have > m0n0wall on has no monitor, keyboard, mouse, or serial console setup). > > Conbine the following: > Consumer based Cable/DSL/Wireless Router (Easy of use, "appliance") > Cisco Gateway/Firewall/VPN/Router/etc (Powerfull/Advanced) > BSD (Rock solid and flexible) > and you get m0n0wall in return. > > Invest $20 on a 32MB CF Card > (http://www.pricewatch.com/1/226/1601-1.htm) (or use that notebook > harddrive) and give m0n0wall a try, you wont be disappointed. > > My m0n0wall setup btw: Box: (P166/48MB Ram/1GB Hdd/4 NICs) Network > Interfaces: (WLAN/LAN/DMZ/WAN) = (802.11b, Linksys WAP11 w/Parabolic > Reflectors*/100BaseTX/100BaseTX/900Mhz NLOS Wireless T1) > > *Ez-12 Parabolic Reflector template from http://www.freeantennas.com/ > Linksys WAP11: 18 dBm TX, -84 dBm RX (1mb), -75 dBm RX (11mb) + Ez-12 > (12dBi Gain) = theoretical Max EIRP: 1400~ milliWatt (30dBm), witch > translates into about 300m LOS, I used overhead transparency film, > heavy duty aluminum foil, and toothpicks to build mine (Elmers spray > adhesive to bond aluminum foil to the transparency film) total cost $3 > for the toothpicks and aluminum foil, this is one of the only ways you > can mod your radio hardware (because your not modding the hardware, > it's a loop hope) and still be legal (EIRP and modding wise) with the > FCC. The EIRP (Effective Isotopic Radiated Power) max for unlicensed > use is 4000~ milliWatt (35dBm) btw. Every 3dB of gain you double the > power, so lets say your that ahole down the street with the 36 dBi > Gain modded sat dish connected to a normal everyday AP with about > 17dBm Gain, add those two together and you get 53 dBm, so my gonads > are exposed to the EIRP of 260 Watts of microwave energy every time I > walk passed it. > > The formula for calculating free space path loss: > L = 20 log(d) + 20 log(f) + 36.6 > (where L=loss in db, d=distance in miles, f=freq in Mhz) >
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