No but they will be about 20 feet high for an H pol 600 MHz slotted waveguide 16 dBi 120 degree sector.
----- Original Message ----- From: "Mike Hammett" <[EMAIL PROTECTED]> To: "WISPA General List" <[email protected]> Sent: Wednesday, November 05, 2008 8:36 AM Subject: Re: [WISPA] Theoretical TVWS coverage >I could see 16 dB sectors. Of course they will be large, but that's what >it > takes at these frequencies. We'll have antennas the same size as the > broadcast TV antennas are now (I've seen some over 40' tall). Hopefully a > manufacturer can work something out with regards to not having to have 4x > 40' sectors on a tower to provide the needed coverage... that could > result > in some tasty rates. > > I don't think the number of wifi devices we see is a useful argument. > Their > response is 3.65 and 5.4 GHz... plenty of new space and no wifi devices. > We need to stress the penetration abilities and the need for copious > amounts > of spectrum that has these penetration abilities. I believe these lower > frequencies will help fill in coverage gaps within any given range. We > may > not have any more range with TVWS vs. existing bands with equal EIRP > because > of smaller antenna requirements, but buildings and trees no longer make > that > coverage spotty. > > > ---------- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > -------------------------------------------------- > From: "Marlon K. Schafer" <[EMAIL PROTECTED]> > Sent: Wednesday, November 05, 2008 8:50 AM > To: "WISPA General List" <[email protected]> > Subject: Re: [WISPA] Theoretical TVWS coverage > >> Hmmm >> >> Just for fun I ran the numbers at 600mhz. >> >> 20 dB tx from the radio, 16dB tx antenna (probably not at all reasonable >> due >> to size and small 50ish* coverage) to a 10 dB cpe antenna. -80 at 50 >> miles! >> >> Same thing with an 8dB (say omni) would be 20 miles at -80. >> >> The sad part though? We can do that with today's wifi gear! 20 miles is >> pretty easy in the open. >> >> Now lets run this at the WISPA 20 WATT level. That's 43dB eirp. >> >> So, 35dB tx power and 8dB omni to 10dB cpe antenna. I get -80 at 100 >> miles! >> Now we're talkin! >> >> The next question that has to be answered. What is the receive signal of >> the average TV set these days? What does it need to be able to pick up a >> signal? We need to know that number if we're to come up with a non >> interfering OOB level that we can suggest to the FCC. >> >> This is why people need to join wispa. We have to fight this fight. >> They >> are still looking at what to do with us it sounds like. We have to be >> ready >> to go back there again. We need to show them pictures of our areas, >> demographics, screen shots of all of the wifi devices we pick up at our >> ap's. etc. etc. etc. >> >> Pretty cool. >> marlon >> >> ----- Original Message ----- >> From: "Mike Hammett" <[EMAIL PROTECTED]> >> To: "WISPA List" <[email protected]> >> Sent: Wednesday, November 05, 2008 5:12 AM >> Subject: [WISPA] Theoretical TVWS coverage >> >> >>> Based on TV antenna, it looks like the largest gain CPE will be around >>> 10 >>> dB for all but the lowest of frequencies. >>> >>> I just ran a Radio Mobile coverage area using a guesstimate at a white >>> spaces system... EIRP of 20 dBm, 16 dBi sector, 10 dBi CPE, -80 dBm >>> minimum allowed receive. The range wasn't much more than 2 miles in >>> flat >>> country land. >>> >>> With those same measurements with a 36 dBm EIRP, we have 10 miles, but >>> terrain comes more into play here. >>> >>> For the extreme rural areas, this is where tower height comes into play. >>> For everyone else, this is your foliage beater. In these areas we still >>> need small cells for bandwidth capacity and interference rejection. >>> >>> Remember, the only signal levels mentioned were 40 mw for personal >>> portable devices. Anything else is just speculation at this point. >>> They >>> may very well give fixed stations 4 W as they do in all other unlicensed >>> bands. >>> >>> >>> ---------- >>> Mike Hammett >>> Intelligent Computing Solutions >>> http://www.ics-il.com >>> >>> >>> >>> -------------------------------------------------------------------------------- >>> 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/ >> >> >> >> -------------------------------------------------------------------------------- >> 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/ >> > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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