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Re: Re: Let's build some Linear Transponders



What is the Input voltage that makes the most sense for a small LEO?

Pieter


>From: Bob Bruninga <bruninga@usna.edu>
>To: William Leijenaar <pe1rah@hotmail.com>
>CC: amsat-bb@AMSAT.Org
>Subject: Re: [amsat-bb] Re: Let's build some Linear Transponders Date: Mon, 
>30 Jun 2003 12:23:55 -0400 (EDT)
>
>On Mon, 30 Jun 2003, William Leijenaar wrote:
>
> > Then I still don't know why amateurs still want one mode satellites,
> > like a PSK31 transponder.... What is the purpose of it ??? What kind of
> > improvement it will give to amateurs world ???
>
>To provide a multi-user linear transponder that can be powered by only a
>4" solar panel (Thats all you get on a cubesat).  Such a transponder can
>support up to 20 or more users in a single 3 KHz passband.  The
>improvements are:
>
>1) Not FM, no capture effect
>2) Multi-user "broadband" transpnoder (3 KHz)
>3) Will fit and be powered by a 4" cubesat.
>
> > Transponders are ideal to do tests with, like sstv, ssb, psk, and even
> > psk31... with many stations at the same time... That most amateurs only 
>want
> > to talk or do just this one mode they like I know, but keep in mind that
> > there are also amateurs who like to do tests... :-)
>
>Yes, but if you do SSB, or SSTV in the 3 KHz transponder then it is a
>single USER satellite again that so many have pointed out is a
>problem...Yes it can support them, and yes we may experiment with special
>passes, but my experience is that it is better to have a satellite comm
>system be in one mode ALWAYS so that users know what to expect instead of
>being dissapointed in changing operations..
>
>Of course CW is very narrow and would be allowed  in  a small portion of
>the passband.  But we will ddetermine that once we are on orbit...
>
>Bob
>
>
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