That's great work Brian! Very cool stuff. To me, that helps to illustrate why adjacent channels are going to be so important to so many markets.
Laters, marlon ----- Original Message ----- From: "Brian Webster" <[EMAIL PROTECTED]> To: "WISPA List" <[email protected]> Sent: Saturday, October 25, 2008 11:27 PM Subject: [WISPA] How much spectrum will we get with whitespaces? > I have been digging around the Digital TV transition rules and the > Whitespaces data. From what I can tell, the spectrum allocated for > whitespaces will be between TV Channels 21 and 51 excluding channel 37 > (didn't find out why that is). So that represents 29-6 MHz wide channels > or > 174 MHz! That's a lot of potential spectrum! Now in my GIS program I was > trying to see if I could map out the areas channel by channel to show how > much of the US would have whitespaces available. I think I will have to > wait > for that until after February 2009. It seems that there are provisions for > low power and translator stations, that give them the ability to move > channels once the transition is complete by the high power broadcast > stations. This will more than likely change the current TV contours > maintained by the FCC (latest version I have is 7/28/08). It was also > worth > noting that the DTV stations are required to reduce their power levels and > are permitted only one fifth the power they were under analog rules (which > helps explain their resistance to unlicensed devices). This should also > change the footprint of the TV contours and thus probably open up some > geographic areas that right now look to be protected by looking at their > analog contour. > So, the bottom line I have concluded is that we can't really see what > or > where some of the RF crowded markets may be able to do with whitespaces. > It > is certain though that areas that already show to be clear will remain > that > way, and that more areas of the US may also become clear areas without any > TV coverage in them whatsoever (at least in the whitespaces channels). In > my > research there have been many quotes by people like the New America > Foundation as to how many channels will be cleared up by the DTV > transition. > Fact of the matter is, they are wrong due to the fact that the FCC and > station owners have not yet finished all the channel swapping and we won't > have a clear picture of that for some time after the February cutover > date. > This is due to the rules established for the Low Power (LPTV) and > translator > stations. http://www.fcc.gov/oet/faqs/dtv-tvtx.html > > I have attached a nationwide map of all the TV contours in the whitespaces > range as of July 2008. This is only to illustrate the areas that will > undoubtedly have spectrum available. This map does not show an accurate > picture channel by channel and still shows the analog stations that may go > off the air or reduce their footprints after February 2009. Due to the > size > of the legend I made that a separate file. Because of station contour > overlap you may not be able to see each contour for each station in this > map. The colors layered with the highest channels on top. > > > Thank You, > Brian Webster > www.wirelessmapping.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/
