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Re: LOS times



Hi Jamie.

Yes, the TDRSS satellites used are TDRSS East and TDRSS West and they have
overlapping coverage on one side of the Earth and a dead spot (ZOE or Zone
Of Exclusion) as you describe.  The pass that just went through the ZOE was
25 minutes long as the shuttle traversed it near the equator where the ZOE
is the widest and crossed on a diagonal, just to make it longer.

Martin Ronney, WB6YMI
-----Original Message-----
From: Jamie Hutches <jmhutches@harding.edu>
To: sarex@AMSAT.Org <sarex@AMSAT.Org>
Date: Sunday, July 25, 1999 15:51
Subject: [sarex] LOS times


>Hi all, I have been watching NASA TV and i have noticed that when ever the
>shuttle is over the Indian Ocean there is a Loss Of Signal for about 20
>minutes. Why is that? Do they not have a TDRS relay sat over there and if
>not why not?
>Just curious.
>I have not heard anything from SAREX transmitters and I have listened for
>every pass close to Arkansas. Last night I listen like crazy and heard
>nothing even though It passed 17 degrees above the horizon!
>I am using a dual-band J-Pole anntenna on a 60 ft tower with 50 watts
>output, is this enough?
>
>Jamie, KD5GOB
>Harding University Amateur Radio Club
>Searcy, Arkansas
>~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
*
>~*~*
>Internet:          Jamie Hutches
>jmhutches@harding.edu        Harding University
>ICQ:  1287771 HU Box 10247
>     Searcy, AR 72149-0001
>Ham Radio: KD5GOB 501-279-5212
>~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
*
>~*~*
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