That depends on the declination for your area. The zero degree line of
declinaction
extends (rougly) from the Western tip of the Florida panhandle to the
Eastern-most
border of Minnesota. Any site East of that line will have a W
declination (subtract from
a compass bearing). Sites West of the line have E declination (add too
compass bearing).
Altitude also has an effect but is far less of a factor than geograpic
position.
I recommend two methods for accurately determining declination (or true
north) at your
location.
1) Use a friends GPS receiver/indicator.
2) Buy (or look at) a USGS topographical map for your site. There is
always a "center of map" declination indicated in the map legend.
Dan N7HQ
-----Original Message-----
From: zeitler@ibm.net [mailto:zeitler@ibm.net]
Sent: Tuesday, November 10, 1998 7:39 AM
To: towertalk@contesting.com
Subject: [TowerTalk] aiming a rotor: true vs. magnetic
Esteemed Reflectees,
I should remember this being an old Navy TACAN tech but........
When aiming my rotor, I have my magnetic compass sitting right under the
boom of my quad. Actually lying flat on the roof with the tower
retracted so
I can manually point the beam. I visually line up the boom with the
compass.
Okay so far. In order to aim the beam at "true" north I would actually
want
it pointing at 012 degrees if I have a magnetic correction of 12
degrees,
right? of course the rotor also needs to be sitting at 12.
Help!!
Lane Zeitler
KM3G
IFF and TACAN tech
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