Hi all.
Deployable gain antennas are possible, but unfortunately attitude
control is a real issue. If the orbit has a high perigee then the
magnetic field for magnetorquing is minimal. With limited fuel and
little or no magnetic field, keeping the antennas pointing correctly is
difficult. Also, all of this getting to HEO is challenging given our
lack of experience with low mass / ion propulsion.
A compromise could be 4 Watts (ish) from MEO. That can be done with
omnidirectional antennas, so when the batteries die and the fuel is
exhausted we still have a useful satellite even if we cannot control
attitude.
Would be great to team up with a group who want to test a propulsion
system and apply for a launch opportunity.
Thanks
David
Here's an oldie but goodie..... http://www.g0mrf.com/MEOSAT.htm
-----Original Message-----
From: Joe <n...@mwt.net>
To: amsat-bb <amsat-bb@amsat.org>
Sent: Tue, 30 Apr 2013 17:18
Subject: [amsat-bb] Re: Path to HEO
On the Outside? :-)
just like 90% of the earlier birds they are rolled or folded up until
after deployment. IIRC: one of the first actually did use a rolled up
tame measure for the elements.
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/30/2013 9:51 AM, Andrew Glasbrenner wrote:
Where do the gain antennas go on a 10x10x30cm HEO?
73, Drew KO4MA
Sent from my iPhone
On Apr 30, 2013, at 9:01 AM, N0JY <n...@lavabit.com> wrote:
I wonder about the amount of time spent in the Van Allen belts on
the way up
there. We're concerned about radiation at a 650 km orbit, it might
take some
heavy duty ($$) radiation tolerant components to survive a few years
trip
through the radiation belts as well as the final high orbit?
Jerry
N0JY
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