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RE: UO-36



This morning everything shut down due to extremely low power.  During these
periods, there are no garantees and even when the satellite is not in
eclipse it may not have sufficient power to operate even it's basic systems,
let alone additional downlink time.  The downlink on UO-36 is 10W, and we
are right on the edge of available power.

Everything I can do will help a bit, but the basic fact is that the orbit is
not very friendly and provides a variable power budget (between 50 and
150w).  The minimum systems on UO-36 consume about 50W so during minimum
power seasons (such as now) we are basically running slightly on the
negative side with the power budget.

Chris

-----Original Message-----
From: PAT McGRATH [mailto:patricio@cyberg8t.com]
Sent: 23 June 2000 18:02
To: Chris Jackson; amsat-bb@AMSAT.Org
Subject: Re: [amsat-bb] UO-36


It is very sunny over California during the early afternoon pass so I am
wondering why UO-36 is not active then?



> Hmm, not easily.  It is whever the elevation of the sun, when seen by the
> satellite, is above 40 degrees.  This will be roughly a 20 minute period
> centered over 20 degrees north on ascending nodes.
>
> It doesn't affect the antenna pattern too much if that's what you're
> thinking.
>
> Chris
>
> -----Original Message-----
> From: PAT McGRATH [mailto:patricio@cyberg8t.com]
> Sent: 23 June 2000 17:05
> To: Chris Jackson; amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] UO-36
>
>
> Chris can you advise what parts of the orbit the satellite is pointed at
the
> sun?
>
>
>
> > We are about to go through maximum eclipse time, and therefore minimum
> > power.  I have implemented an algorithm to point the satellite at the
sun
> > during parts of the orbit that it would otherwise not get any power and
> this
> > is helping a certain amount.  However, if the swatellite is in eclipse,
> then
> > it is possible (probable) that there may not be enough power at the
moment
> > to operate the transponder.
> >
> > The lowest power point is around midnight on Sunday.
> >
> > Cheers
> > Chris G7UPN
> >
>
>

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