Butch, Your analysis looks good. I'm still reading through the rules and I WILL be commenting just as soon as I get through it all. :)
I don't think Fresnel is going to be too much of a problem. Which page did you pick up that antenna height requirement from? jack Butch Evans wrote: > On Wed, 19 Nov 2008, Jack Unger wrote: > > >> Sorry Mike. I try to limit my time to responding only to serious, >> thoughtful comments. I don't normally respond to smart-a** comments >> because I just don't have any time to waste on them. >> > > Ouch! :-) > > Has anyone done an RF propagation study in your area for the TVWS? > I just did a quick check in RM for my area. I used the following > parameters: > > 10 Meter antenna height (both ends) > 4W EIRP (1+3) Omni > Channel 51 (should be the "worst case" propagation) > > Using the polar coverage, I am seeing over 16 MILES at -104 RX > sensitivity. About 11 miles is -90. At about 8 miles is the -80s > and 4 miles is -60s. > > I will be trying this with a 10 meter antenna talking to a 100mW > device next (for indoor installs) just to see what happens. > > The WORST problem I see with this is Fresnel. It is NUTS! Maybe > Fresnel problems are not as big an issue with this low of a > frequency, but if it is, I can't see using more than a 3-4 mile cell > as the antenna heights would be crazy. > > Jack, care to comment on the characteristics to be concerned about > in this band? IS fresnel gonna be a problem? What about antenna > heights due to the 10 meter requirement (WHAT were they smoking?). > > -- Jack Unger - President, Ask-Wi.Com, Inc. Serving the Broadband Wireless Industry Since 1993 Cisco Press Author - "Deploying License-Free Wireless WANs" WISPs - Do you know where your customers are? For wireless coverage mapping see http://www.ask-wi.com/mapping FCC Lic. #PG-12-25133 LinkedIn Profile <http://www.linkedin.com/in/jackunger> Phone 818-227-4220 Email <[EMAIL PROTECTED]> -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
