Friends in Radio Land,
I have agonized enough, watching this discussion about magnetic variation.
The information needed can be found on a map from the Defense Mapping
Agency (they have a 800-number). In fact, they have a full set of
geomagnetic maps for those interested. But for magnetic variation, ask
for DMA Stock No. WOBZC42. I don't recall the price but if you're
serious, it is not unreasonable.
For some typical values, consider the following for the compass variation:
Seattle 22 degs E of North
Bismarck. ND 10 degs E of North
Chicago, IL 1 deg W of North
Detroit, MI 6 degs W of North
Buffalo, NY 10 degs W of North
New York City 15 degs W of North
Los Angeles 14 degs E of North
El Paso, TX 10 degs E of North
New Orleans 3 degs E of North
Charleston 5 degs W of North
Wash, D.C. 10 degs W of North
That ought to get you oriented. Now the next question is the width of
your antenna pattern.
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