[amsat-bb] Re: LF Satellite ideas?

Jeff Yanko wb3jfs at cox.net
Sun Dec 12 03:26:12 PST 2010

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?


Jeff  WB3JFS

----- 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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