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Re: Re: Heo, Leo, Meo



Hi John,

I've thought about this too especially since the Delta II rockets used for
GPS launches do sometimes carry secondary payloads.  The problem is that we
would need some propulsion to get into a long term orbit.  So far I'm not
aware of any secondary Delta II payloads that have had any propulsion
capable of a major orbit change.  All the secondaries I've seen are on the
Delta second stage which after the second burn on a GPS mission would leave
you in an orbit 101x622 nmi with an inclination of 37 degrees.  Even the
third stage only gets the GPS satellite into a 101x10996 nmi transfer orbit.
The GPS satellite then uses its own kick motor to circularize the final
orbit.

One hope is that the DoD is developing a secondary payload adapter for the
EELV (both Atlas V and Delta IV) program.  You can read about it at
http://www.te.plk.af.mil/stp/espa/espauser.pdf

Lee-KU4OS

----- Original Message ----- 
From: "John W Lee" <k6yk@juno.com>
To: <al7eb@ptialaska.net>; <amsat-bb@AMSAT.Org>
Sent: Saturday, June 21, 2003 11:52 AM
Subject: [amsat-bb] Re: Heo, Leo, Meo


> I think I asked this question before, but don't think I ever got a
> definitive answer.
>
> (I guess this would qualify as a MEO ? )  Why have they not ever put a
> ham satellite
> (whatever mode) in the same type orbit as the GPS birds?  I think they
> are around
> 5000 miles up?  BIG footprint, but not as big as  AO-10, AO-40, etc.
> Mode B or J ?
> Donno about mode A at that altitude?  I was of course referring to a
> passband
> transponder type bird.
>
> 73,
> John, K6YK
>
>
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