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 > > _______________________________________________ > 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 > _______________________________________________ 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 _______________________________________________ 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
