Andy Middleton wrote: > Jack and Frank > > I've read your book; has been a HELL of ALOt of help! Great stuff! > However passive repeaters are only mentioned, and my question is this: > I have an AP at 1km west from my flat, but no direct view. I have a friend's > flat 50m north and higher up who does see the AP. After trying to calculate > freespace loss using a passive repeater, for two radio journeys (1km=100dBm, > 50m=78dBm), it seems I need a signal that is 178dBm stronger than my > reciever threshold? I am assuming that the repeater will not lose any power > just to keep things simple, and was thinking of 2 similar 14dB gain yagis > that theoretically will not add anything only redirect the signal 90� south > from my friends flat to my flat. > With this calc., I seem to need a transmitter with more than 93dB power to > get a signal on a -85dB card! This is obviously not possible with 802.11b! > Is there anyway around this? Should I use different antenas on the repeater? > Is repeating at tese low powers only possible with a powered repeater?
Andy - You are correct that the path loss with a passive repeater is equal to the sum of the free-space path losses over both of the paths. This makes a passive repeater not practical at 802.11b power levels. Your best bet is to use a powered repeater (one radio that will repeat but cut the bandwidth in half, or one radio with two wireless cards, or two radios back to back). jack > > Any help would be ideal as I am trying to set up a LAN with a webcam on the > AP looking out over Santa Cruz. > > PS. If the webcam is at the AP, the easiest solution to see it on the WLAN > would be plugging it into a LAN port in the AP? Sounds right. > > Thanks > > Andy, Tenerife -- Jack Unger, President-Wireless InfoNet ([EMAIL PROTECTED]) 818 227-4220 Vendor-Neutral WISP Training - http://www.ask-wi.com/2002workshops.html Author - "Deploying License-Free Wireless WANs" <http://www.ask-wi.com/book.html>
