Hi Jamie -
The difference between true and magnetic compass bearings is known as
VARIATION, not declination. Variation in the U.S. is not anywhere
near constant, making magnetic north (the direction that the needle
points on a compass) from a few degrees left of true north, to over 15
degrees to the right. It is not directly related to latitude. A good
source of the lines of variation is in aeronautical sectional charts
(maps).
Until one gets into the far north, most of North America's variation
angle isn't enough to probably worry about, unless you happen to be
near a large iron deposit or something else that would cause this
"variation error" to get really big.
Good luck in the contest! 73's de frank AA0GG
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Subject: declination??
Author: Jamie Tolbert <jtolbert@gremlan.org> at internet
To: <towertalk@contesting.com>
Date: 10/22/96 8:05 PM
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Today I heard a carribean dxpedition for the cqww concerned because he
wasnt sure how to adjust for the difference between true and magnetic
north...Is there really a big difference?? I think for my latitude its
around 4 degrees..Should ones antenna be set for true or magnetic north??
Also a W0 on one of the reflectors( I hope this one) mentioned that
while experimenting with a 1/4 wave sloper they got a significant signal
strentgh difference on rx while adjusting the angle...what does work best??
wouldnt it depend on the incoming signal angles?? wont it change as
propagation condx change??73 Jamie WW3S
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