The FCC asks for both tower base MSL (mean sea level) and the AGL (above ground level). So if you are on a 100’ tower at 100’ you report 100’ . You report the ground elevation at whatever it actually is - including the 15’
Mark > On Oct 30, 2020, at 9:56 PM, Adam Moffett <dmmoff...@gmail.com> wrote: > > 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: >> 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? >> >> On Fri, Oct 30, 2020, 3:45 PM Adam Moffett <dmmoff...@gmail.com >> <mailto:dmmoff...@gmail.com>> wrote: >> 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. >> >> >> On 10/30/2020 4:39 PM, Adam Moffett wrote: >> > 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 <mailto:AF@af.afmug.com> >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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