[amsat-bb] Re: Path to HEO
g0mrf at aol.com
g0mrf at aol.com
Tue Apr 30 13:35:08 PDT 2013
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
Would be great to team up with a group who want to test a propulsion
system and apply for a launch opportunity.
Here's an oldie but goodie..... http://www.g0mrf.com/MEOSAT.htm
From: Joe <nss at mwt.net>
To: amsat-bb <amsat-bb at 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.
The Original Rolling Ball Clock
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 <n0jy at 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
heavy duty ($$) radiation tolerant components to survive a few years
through the radiation belts as well as the final high orbit?
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