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 aspect.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jeff Yanko Sent: Sunday, December 12, 2010 5:26 AM To: Bob Bruninga ; [email protected] Subject: [amsat-bb] Re: LF Satellite ideas?
Hi all,
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?
73,
Jeff WB3JFS
----- Original Message ----- From: "Bob Bruninga " [email protected] To: [email protected] 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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_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb