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Re: BBsat Call for ideas



I'll play!

On the drive home from the symposium in Atlanta, I was thinking about a 
cubesat with a "hybrid" voice repeater. My idea would use a 435 FM uplink 
because it's easy to generate power enough on the ground, and the Doppler 
shift moves QRM out of the uplink fast, it's FM and not picky about tuning, 
and there aren't any illegal telephones that work on the uplink AFAIK. We'd 
use a 2m SSB downlink, for a few reasons. 2m path loss is less, so given 
similar antennas we'll get a better downlink. SSB is more efficient than FM, 
and we also save power by not transmitting unless there is audio on the 
uplink, a squelch of sorts.

No computer on my satellite either! We'd have some sort of hardware timer 
that has to be reset every few days to keep the repeater running, so we 
could meet FCC rules on control. Maybe PL or DTMF?

Wouldn't it be neat to have one of these sitting on the shelf in case a 
empty spot on a PPOD became available?

73, Drew KO4MA

----- Original Message ----- 
From: "JoAnne Maenpaa" <k9jkm@comcast.net>
To: <AMSAT-BB@amsat.org>
Sent: Monday, November 24, 2008 8:40 PM
Subject: [amsat-bb] BBsat Call for ideas


> Ok folks,
>
> Its time for some fun ... how about we design and fly our own transponder
> via the amsat-bb?
>
> I propose BBSat (sounds better than AdHocSat).  This is a call for ideas 
> of
> a single board transponder in cubesat form factor ... what can we put on a
> 10cm ^2 circuit board?  FM, SDR, packet?
>
> Initially there are only two rules ...
> 1) No griping
> 2) This is going to be an open source project
>
> Let us know what you think right here on the -bb ...
>
> --
> 73 de JoAnne K9JKM
> k9jkm@amsat.org
>
>
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