Fw: [NLRS] Duct thickness @ 10 GHz

Mon, 10 Feb 2003 22:39:14 -0600

Jon, all...... While it may be coincidental, some of your observation is
supported in that at EN47jh, Palisade Head, signals to Brockway Mtn were
quite weak....difficult, but QSOs were made.     I don't know the elevation
but 80-100 meters above the lake is a guess.    The next location was on the
water on both ends (down into the duct) with signals very strong in the 20+9
range...no dificulty...    As you can tell by many of the pictures of the
trip on the NLRS website, we were around 2-5 meters above the water when
signals were strong.   Weather was fair, light winds, cool overnight (in
fact quite chilling early on) with partial warming sun all morning...  It's
possible that late September weather may be more suitable for  generating
the duct than earlier in August?

Great fun!  Hope more will be able to make the trip this year....

73   Jim   K0KFC

----- Original Message -----
From: "Jon Platt" <[email protected]>
To: <[email protected]>
Sent: Monday, February 10, 2003 6:39 PM
Subject: [NLRS] Duct thickness @ 10 GHz

> 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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