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Old 09-24-08, 10:06 PM   #2
Molon Labe
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Join Date: Jun 2004
Location: Along the Watchtower
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It's just an area about 1-1.5nm wide at 30nm intervals where transmission loss is sharply reduced. For sure it goes out to three, I wouldn't rule out a 4th if you can get a loud enough source. Depth doesn't seem to matter at all.
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