Magnetic declination depends on where in the world you are located and it does change over time. Most topographic 7.5 minute quad maps show that declination in the legend area. For me it’s about 12.5 degrees west of north, in other areas like the pacific northwest it’s about 14 to 16 degrees east of North. Important information to know. Years ago we had drawings from an engineering firm that showed the declination from true to magnetic but they put it in the wrong direction so the error on the drawings was over 40 degrees (based on 1998 declinations) and as such the tower antenna platform got installed wrong.
A good map showing the details can be viewed here including the years as to what declination was applied at the time. It does change over time. Surveyors need to know this if they are trying to set property lines based on an old legal description. https://maps.ngdc.noaa.gov/viewers/historical_declination/ Thank You, Brian Webster <http://www.wirelessmapping.com> www.wirelessmapping.com www.Broadband-Mapping.com From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Ken Hohhof Sent: Friday, May 10, 2019 6:58 PM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] Antenna Aligner You’re not making me less confused. Back when I was teaching cub scouts to use a compass, was I teaching them a bunch of crap? From: AF <af-boun...@af.afmug.com> On Behalf Of SmarterBroadband Sent: Friday, May 10, 2019 5:48 PM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Subject: Re: [AFMUG] Antenna Aligner 14 for me. From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of ch...@wbmfg.com Sent: Friday, May 10, 2019 3:18 PM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Subject: Re: [AFMUG] Antenna Aligner It is only 1 or 2 degrees where you live but it is probably 15 degrees where Bill lives. From: Ken Hohhof Sent: Friday, May 10, 2019 4:14 PM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] Antenna Aligner Whenever I see the difference between magnetic and true north I get confused about which one we’re supposedly using and decide 1 or 2 degrees doesn’t matter on a 90 degree sector. Plus I get lazy and just align the sectors to the tower faces or the roads. From: AF <af-boun...@af.afmug.com> On Behalf Of Daniel White Sent: Friday, May 10, 2019 4:37 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Antenna Aligner I've used the 3Z and Sunsight ones some. It was a few years ago though. Really it boils down if you want the screen on the device or to use your phone or sometheneing else. I'd probably go with Sunsight personally, but either are a good investment. <https://atheral.com/> Image removed by sender. Daniel White Co-Founder - Business Development & Operations direct: +1 (702) 470-2766 <https://www.facebook.com/getatheral> Image removed by sender. Facebook icon <https://www.linkedin.com/company/atheral/> Image removed by sender. LinkedIn icon <https://www.youtube.com/channel/UCpPZv-EsGCj8LXfzylwCrjQ> Image removed by sender. Youtbue icon SmarterBroadband wrote on 5/10/19 15:28: Thinking of getting an Antenna Aligner for Sector and Dish alignment. Choices seem to be Multiwave Smart Aligner 3Z Telecom RF Vision Sunsight Anyone have experience of any of these? Thanks Adam _____ -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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