[amsat-bb] Re: 2.4GHz broadband router on satellite?
orbitjet at hotmail.com
Fri Feb 22 20:46:55 PST 2013
There has been some work done with wireless routers and amplifiers in several balloon flights in association with the Wx bureau. A group which I am a part of got the equivalent of an SBIR from a federal agency to do this work (plus they helped us get on the balloons. There is no secret here really, the various formulas associated with link margins etc "work" (grin) and the links were quite solid AND city RF made little difference. Directional arrays on the ground are ones friend and even near "WiFI" hotspots the systems worked well (that was part of the test).
The main issue for a satellite particularly one in LEO is going to be doppler shift. Farther out of course the shift is less but link margin is more difficult.
The frequencies are different but we are now using TACSAT 4 for some test. Robert WB5MZO
> Date: Fri, 22 Feb 2013 21:36:01 +0000
> From: m5aka at yahoo.co.uk
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
> --- On Fri, 22/2/13, Joshua Abraham <jarvideo at gmail.com> wrote:
> > I seem to remember reading about a successful experiment involving high
> > altitude balloons.
> See http://www.nrl.navy.mil/content_images/07Information_Rupar.pdf
> 73 Trevor M5AKA
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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