I built a 5 meter earth station foundation wrong because the transit I borrowed from the forest station had declination already dialed into the compass and I adjusted for it a second time visually when laying out the forms.
Sent from my iPhone > On May 13, 2019, at 6:30 AM, Brian Webster <i...@wirelessmapping.com> wrote: > > 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 > 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. > > <image002.jpg> > Daniel White > Co-Founder - Business Development & Operations > direct: +1 (702) 470-2766 > <image004.jpg> <image004.jpg> <image004.jpg> > 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 > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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