Hardy guy weighing-in! Mark and Daniel are both correct, except:
Bullet point 6 should read: Any change in transmit antenna polarization https://www.rfvenue.com/blog/2015/07/01/polarization-polarity-and-polar-pattern-whats-the-difference Daniel’s points below come from § 1.929(d) Classification of filings as major or minor. It should be noted that this only pertains to application filings and whether they are treated as major or minor modifications by the FCC. Part 101.103(d) covers Frequency coordination and under paragraph (d)(1) they specify “Coordination must be completed prior to filing an application for regular authorization, or a major amendment to a pending application or any modification to a license.” While a strict interpretation of this would lead one to believe that minor changes would not need to be prior coordinated, the FCC usually requires some kind of statement from the coordinator that the changes were analyzed and forwarded to other coordinators for examination. Its generally recognized that changes below these minimums should not appreciably affect the previous interference analysis, but there can be issues with closely located stations that are transmitting/receiving the same frequencies (known as a buck for FDD systems). Coordinators should have a greatly reduced fee for minor change notices since the whole process is very quick with little labor involved. It should be pointed out again that these major/minor requirements do not provide “slop factors” that one can legally operate under - they simply cover how license amendments will be processed. The licensee is expected to fulfill the coordinate and ground elevation accuracy requirements of 101.103(d): "The position location of antenna sites shall be determined to an accuracy of no less than ±1 second in the horizontal dimensions (latitude and longitude) and ±1 meter in the vertical dimension (ground elevation) with respect to the National Spatial Reference System.” > On Oct 31, 2020, at 8:16 PM, Daniel White <dwh...@atheral.com> wrote: > > 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 > > > 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 <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>
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