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?). -- ******************************************************************** * Butch Evans * Professional Network Consultation* * http://www.butchevans.com/ * Network Engineering * * http://www.wispa.org/ * WISPA Board Member * * http://blog.butchevans.com/ * Wired or Wireless Networks * ******************************************************************** -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
