[NLRS] Duct thickness @ 10 GHz

[Donn Baker]

The thing we noticed in September was that the duct was at least 150' or so
thick.  With the Michigan end up on Mt. Brockaway and us at lake level,
there was almost no signals.  (Also, no signals from the Thompson Rest Stop
~600' above the lake to Mt. Brockaway.)

When we got to Palisad Head (~150-200' above lake level) we made our first
Qs.  After Gary, Lenny, and Bruce moved down to lake level, signals were
even better.  We moved down to Split Rock Light (~1mi north, actually).
Maybe 100' above the lake.  10-20 over.  At the remaining stops, signals
were better than 20 over.  At one point, I turned the dish 180*, and had S9
copy!  When we got back to Thompson Rest Stop, the signals were nil.

Does this help any ?

73 Donn
WA2VOI/0

At 18:39 10-02-03 -0600, Jon Platt wrote:
>OK, question #2.  Assuming a refraction index that produces ducting, how
>thick does the duct need to be to propagate a 10 GHz signal ?   Yes, much
>thinner than 2m.
>
>My guess, and its just that, a pure guess, is that if you need a duct
>thickness of about 400m or so at 144 MHz, then a duct may only need to be
>about 10 to 20m in thickness to propagate a 10 GHz signal.   Maybe a little
>thinner.  Anyone else have a better number ?
>
>73, Jon
>W0ZQ
>
>
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