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Re: Re: Asteroid echos on 2380 MHz



Yeah...one of the first test ofthe 14 foot dish...

Robert


>From: "Edward R. Cole" <al7eb@ptialaska.net>
>To: amsat-bb@AMSAT.Org
>Subject: [amsat-bb] Re: Asteroid echos on 2380 MHz
>Date: Thu, 15 Aug 2002 22:21:13 -0800
>
>ARRL article:
>http://www.arrl.org/news/stories/2002/08/15/3/?nc=1
>
>Link from the ARRL article:
>http://neo.jpl.nasa.gov/cgi-bin/db?name=2002+NY40+&group=all&search=Search
>
>There is a box listing orbital elements that you can manually enter into a
>tracking program.
>
>The asteroid is purportedly about 1/2 mile in diameter and passing at a
>distance of 300,000 miles (just beyond the orbit of the moon).  So how
>strong an echo will this tiny rock produce compared to a moonbounce signal
>(off a much bigger rock!)?  Of course Arecibo will be running a signal 9000
>times as powerful as is used on 2304 MHz eme (avg 100w), and with 40 dB
>more antenna gain!  That's about 80 dB stronger!  the moon is about a
>quarter the size of the earth (guessing 2000 miles diameter) so that is
>(very) roughly (Drock)^2/ (Dmoon)^2 = 1/16,000,000 weaker reflection!
>
>So whatdya say?  Is this possible?
>
>Ed, AL7EB
>
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Robert Oler WB5MZO Houston TX


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