I think signal propagation characteristics like diffraction are a much bigger issue at low frequencies closer to the ground.
Here's a link that discusses some of the issues http://users.ictp.it/~radionet/ghana1998/LINKLOSS/INDEX.HTM <http://users.ictp.it/%7Eradionet/ghana1998/LINKLOSS/INDEX.HTM> Dave Hulsebus Tom DeReggi wrote: > Yes, thats because the height requirement was for facilitating accuracy of > sensing, and sensing no longer being the method the rules rely on for > interference avoidance. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Mike Hammett" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Wednesday, November 19, 2008 1:48 PM > Subject: [WISPA] TVBD height requirement > > > >> There previously was some discussion about a 10 meter antenna height >> requirement in the TVWS. >> >> I'm only on page 43 of the report, but on this page it states that the FCC >> doesn't see a need for either a height or an outdoor requirement, only a >> 40 cm distance away from people. This is to comply with the most >> restrictive MPE distance required by the frequencies in use. >> >> TVWS = TeleVision White Spaces >> TVBD = TeleVision Band Device >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> -------------------------------------------------------------------------------- >> 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/ >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG. >> Version: 7.5.549 / Virus Database: 270.9.7/1799 - Release Date: 11/19/2008 >> 8:58 AM >> >> >> > > > > -------------------------------------------------------------------------------- > 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/ > -------------------------------------------------------------------------------- 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/
