[amsat-bb] Re: Can we get them to fix AO-40 first then?
kl7uw at acsalaska.net
Thu Oct 15 21:34:05 PDT 2009
So, IF the battery un-shorts, IF the IHU boots
and resets the beacon (S-band, I
assume). Therefore, for the rest of us,
occasional monitoring the beacon frequency would
be good (using the current keps to estimate
Doppler offset). IF detected, then commands
could be attempted. Sounds like a lot of
IF's. Is this a good reason to keep your S-band
downlink equipment working? Think about it.
Integrity of S/C is unknown, so its all a big guessing game.
I remain available (when QRV on L-band with 865
kW EIRP) for command attempts (lat=60.675N, Lon=151.316W).
73, Ed - KL7UW
At 07:20 PM 10/15/2009, Rocky Jones wrote:
>Hello Peter and thanks for the reply...sorry mine was so late, busy afternoon.
>you answered my question. I had "heard" that
>with the arrays folded or based on some
>failures...that AO-40 did not have 360 degree
>coverage in solar cells around its spin access.
>If that was the case then the battery was going
>to be essential for any type of recovery...but
>since it is not accurate then I agree if the
>battery will open (do a "seven") then the only
>question would be the Solar angle.
>Thank you for a very good and straight forward answer 73
> > Date: Thu, 15 Oct 2009 23:30:03 +0200
> > From: peter.guelzow at kourou.de
> > To: orbitjet at hotmail.com
> > CC: samudra.haque at gmail.com; amsat-bb at amsat.org
> > Subject: Re: [amsat-bb] Re: Can we get them to fix AO-40 first then?
> > Hi Robert,
> > that's indeed the big question... We do not know in which attitude the
> > spacecraft is.. is it still spinning very slowly or tumbling? What is
> > the Solar-ß-Angel?
> > If the S/C has a good orientation to the sun and the battery opens, than
> > there should be enough power to operate the IHU and Beacon etc... do
> > some magnetorquing to improve attitude.
> > Something like this was done when AO-10 was hit by the last rocket
> > stage, spinning the wrong direction with sun directly on top and almost
> > no power...
> > Unfolding the solar panels would give very high power only when they are
> > oriented towards the sun. With folded solar arrays, all panels around
> > the satellite can still see the sun around it's spin axis.
> > Only when it shines on top or bottom, we will have problems...
> > 73s Peter
> > Rocky Jones wrote:
> > > Peter.
> > >
> > > In the current configuration (or the last known config) of the vehicle
> > > does the vehicle have sufficient solar illumination to "spin" and
> > > maintain the DC busses without a battery?
> > >
> > > Robert WB5MZO
> > >
> > > ------------------------------------------------------------------------
> > > Hotmail: Powerful Free email with security by Microsoft. Get it now.
> > > <http://clk.atdmt.com/GBL/go/171222986/direct/01/>
>Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
73, Ed - KL7UW, WD2XSH/45
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
500-KHz/CW, 144-MHz EME, 1296-MHz EME
DUBUS Magazine USA Rep dubususa at hotmail.com
More information about the AMSAT-BB