[amsat-bb] Re: LF Satellite ideas?
Alan P. Biddle
APBIDDLE at UNITED.NET
Sun Dec 12 04:38:06 PST 2010
Running a long conductor at high speeds through even a week magnetic field
produces some impressive voltages. It has been proposed as a way to convert
kinetic energy to electrical power, and run in reverse to provide a method
to reboost spacecraft. Lots of theoretical and experimental studies on that
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Jeff Yanko
Sent: Sunday, December 12, 2010 5:26 AM
To: Bob Bruninga ; amsat-bb at amsat.org
Subject: [amsat-bb] Re: LF Satellite ideas?
A 1100 meter long antenna attached to a satellite moving through a very thin
atmosphere would be interesting. My concern would be the static build up of
energy on the antenna leading back to the satellite. I would think it this
would fry any circuitry in the satellite. If I recall correctly didn't one
of the shuttle mission have a problem of static build up on along tether and
had to give up on the experiment?
----- Original Message -----
From: "Bob Bruninga " <bruninga at usna.edu>
To: <amsat-bb at amsat.org>
Sent: Saturday, December 11, 2010 11:13 AM
Subject: [amsat-bb] LF Satellite ideas?
> Is 137 KHz possible from space?
> Our next Cubesat will have a 1100 meter long antenna (think tether
> satellite). It will ultimatelly be an electrodynamic tether but the first
> one will have NO ACTIVE ELECTRONICS connected to the tether.
> So I have asked them to make it 1100m long instead of a generic 1km tether
> to try to make it resonant in an amateur band. THe path loss at 137 KHz
> is 60 dB LESS than it is at 2 meters, so it shouldn't take much to
> communicate with an 1100m long antenna.
> I'm sorry I didnt think of this sooner, but I need a real SCIENCE
> justification for this. Maybe LF that low will never punch through the
> ionosphere, or maybe it will be completely absorbed. Can give good
> science on this idea?
> Bob, WB4APR
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