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Re: an amateur satellite for $295



Hi Greg, KO6TH

Read please the following article 

http://msl.jpl.nasa.gov/QuickLooks/echoQL.html

73" de

i8CVS Domenico

----- Original Message ----- 
From: "Greg D." <ko6th_greg@hotmail.com>
To: <bruninga@usna.edu>; <amsat-bb@amsat.org>
Sent: Saturday, July 22, 2006 5:51 AM
Subject: Re: [amsat-bb] an amateur satellite for $295


> Actually, what about bouncing a signal off the balloon, Oscar Zero style?
> 
> In fact, if you sent a very steady carrier at it, I bet you'd be able to 
> "hear" the golf balls inside hitting the skin, by the very tiny blips of 
> doppler caused by the skin moving.  Probably below the threshold of 
> detection... oh well.
> 
> Greg  KO6TH
> 
> 
> ----Original Message Follows----
> From: "Robert Bruninga" <bruninga@usna.edu>
> To: <amsat-bb@amsat.org>
> Subject: Re: [amsat-bb] an amateur satellite for $295
> Date: Fri, 21 Jul 2006 08:46:50 -0400
> 
> Only possible COMMS method from inside to outside I can see is
> Accoustic, to modulate the aluminized bubble skin, and then
> Laser reflection to recover that on the ground <GRIN>...
> 
> Or, from outside-in, use a wrap-around LCD display on the tiny package
> that can display packet messages sent from the ground with high-
> power transmitters.  The messages are seen on the on-board
> camera that views the items and then to the website.... Bob
> 
>  >>> "Tom Clark, K3IO" <K3IO@verizon.net> 07/20/06 5:44 PM >>>
> It appears that the keep the items contained and flying loose within the
> inflatable module(see the graphic at
> http://www.bigelowaerospace.com/fly_stuff/items/examples.php), so you
> must be prepared to occasionally contact somebody else's item and the
> balloon's walls. Also, as Pieter noted, it's not clear how much solar
> energy leaks thru the VECTRAN (http://www.vectranfiber.com/)skin if you
> want to try some solar mini-panels for power.
> 
> I also note that Vectran has a dielectric constant = 3.3, so when you
> design your antennas, you need to take into account that you will be
> executing a random walk inside a "balloon" which has a velocity factor
> of 1/sqrt(3.3)=0.55 and an aluminized skin.
> 
> Have fun !! -- 73, Tom
> ----
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