This is from a presentation I wrote while I was at Bridgewave... this dates back to 2011. Assuming the FCC has not changed their rules on any of this... it should still be good. I believe Mr. Hardy reviewed this for me back then :-)
Any change made to an existing license or PCN that introduces additional potential or direct interference is considered a major modification and must be re-coordinated Examples: * Any change in transmit antenna location greater than 5 seconds * Any change in emission type * Increase in EIRP greater than 3 dB * Change in transmit antenna height AMSL greater than 3 meters * Any increase in transmit antenna beamwidth * Any change in transmit antenna polarity * Any change in transmit antenna azimuth greater than one degree photograph Daniel White Co-Founder phone: +1 (702) 470-2770 direct:+1 (702) 470-2766 > Adam Moffett <mailto:dmmoff...@gmail.com> > October 30, 2020 at 19:58 > > I wonder if that Hardy guy has an opinion. > > On 10/30/2020 9:56 PM, Adam Moffett wrote: > > > Adam Moffett <mailto:dmmoff...@gmail.com> > October 30, 2020 at 19:56 > > I don't know what the FCC would say, but I'd argue 115' because the > /original/ ground level as it will appear in anybody's elevation data > would not include the 15' mound made when they built the tower. > > .....I also don't imagine anybody's gonna climb up there with a tape > measure and double check me. > > On 10/30/2020 8:31 PM, Steve Jones wrote: > > > Steve Jones <mailto:thatoneguyst...@gmail.com> > October 30, 2020 at 18:31 > My biggest issue is what agl is based off of. We just did a link where > they built the ground up 15 feet, are we 115 feet or 100 feet if the > structure is 100 feet tall? How are propagation profiles accounting > for discrepancies like this? Is there and actual way to calculate amsl? > > > > Adam Moffett <mailto:dmmoff...@gmail.com> > October 30, 2020 at 14:44 > Ok I think I answered that myself. Part 101 calls for accuracy to +/- > 1 meter. I thought someone told me there was more play than that. > > > > > Adam Moffett <mailto:dmmoff...@gmail.com> > October 30, 2020 at 14:39 > Isn't there some margin of error allowed on the antenna height on a > microwave license? I seem to think +/- 25 feet, but I can't remember > why I think that. > > >
-- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
