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CX2SA > SATDIG 23.11.11 22:04l 200 Lines 5974 Bytes #999 (0) @ WW
BID : AMSATBB6637
Read: GUEST
Subj: AMSAT-BB-digest V6 637
Path: IZ3LSV<IK2XDE<ON4HU<CX2ACB<CX2SA
Sent: 111123/2002Z @:CX2SA.LAV.URY.SA #:40017 [Minas] FBB7.00e $:AMSATBB6637
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Office Closed (Martha)
2. Build a GPS receiver (Daniel Schultz)
3. AO-51 now shutting off tx soon after eclipse (Richard Grabotin)
4. Elana-3 objects (g.shirville@xxxxxxxxxx.xxxx
5. Re: AO-51 now shutting off tx soon after eclipse (Mark L. Hammond)
6. Signal Received From Phobos-Grunt (B J)
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Message: 1
Date: Tue, 22 Nov 2011 16:18:01 -0500
From: Martha <martha@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>, Board of Directors <bod@xxxxx.xxx>
Subject: [amsat-bb] Office Closed
Message-ID:
<CAPk0USy+QA7EoyefDML3B7RShJLoTm6gvhY-kpXYnENoLo+73Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
The AMSAT Office will be closed from Wednesday, November 23rd thru Monday,
November 28th. For those who celebrate Thanksgiving, have a happy holiday.
--
73- Martha
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Message: 2
Date: Tue, 22 Nov 2011 21:18:00 -0500
From: "Daniel Schultz" <n8fgv@xxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Build a GPS receiver
Message-ID: <981PkwcRa3952S03.1322014680@xxxxx.xxx.xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
If you ever wondered what goes on inside your GPS receiver, there is no better
way to learn than to build one:
http://www.holmea.demon.co.uk/GPS/Main.htm
Dan Schultz, N8FGV
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Message: 3
Date: Tue, 22 Nov 2011 11:21:10 -0800
From: Richard Grabotin <k7lwv@xx.xxx>
To: Amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-51 now shutting off tx soon after eclipse
Message-ID: <4ECBF626.3050802@xx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII; format=flowed
Re-post from Amsat's twitter:
"AO-51 now shutting off tx soon after eclipse, due to batt voltage
dropping below regulator threshold. Recovers to 1w in sun."
Were people still using this bird in eclipse with only 2 out of 6 usable
cells? Perhaps this bird needs to be put on a schedule like AO-27. Can
that be done?
Richard
K7LWV
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Message: 4
Date: Wed, 23 Nov 2011 10:51:00 -0000
From: <g.shirville@xxxxxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Cc: "CubeSat @ CubeSat.org" <cubesat@xxxxxxx.xxx>
Subject: [amsat-bb] Elana-3 objects
Message-ID: <B1310FEA4786481BA7CF8F81A019477D@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I am intrigued that the six objects from this launch seem not to be
separating as far/fast as I would have expected. After 4 weeks from launch
they all seem to be still close together. Do we know if the separation
springs were deliberately low power or what the separation speeds were
intended to be?
many thanks
Graham
G3VZV
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Message: 5
Date: Wed, 23 Nov 2011 07:19:06 -0500
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
To: Richard Grabotin <k7lwv@xx.xxx>, amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-51 now shutting off tx soon after eclipse
Message-ID: <0cK61i0084ltuWb05cK62m@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Richard,
Good thoughts, but the difference between "needs to be" and "can it be" is
the tough part.
Actually, 4 of the cells are good, 2 are bad. One of the four good ones
seems a bit weaker than the other three.
We cannot do any scheduling because of the great difficulty in getting all
the satellite code uploaded and running without a crash that sends it back
to square one.
We are lucky to see what we are seeing right now---basically, it's shutting
itself OFF due to low voltage during an eclipse (that's the easy part...)
What's amazing is that it's coming back ON when voltage returns! This is
actually a great thing--and it amounts to primitive scheduling of sorts.
We never expected it--but we'll take it!!
So---we have what we have. And we don't plan to change operations until the
bird forces us to do so. It's all about equilibrium (temperature, power
out, sunlight). We're balanced apparently for the time being...
Over the next month or so, eclipse times will double from what they are
right now. We are not too excited about that...we'll just have to see how
it goes. If it means earlier shutdown during eclipse--so what? What will
be key is if it comes back on in the sun!
73,
Mark N8MH
AO-51 Command Station
At 11:21 AM 11/22/2011 -0800, you wrote:
>Re-post from Amsat's twitter:
>
>"AO-51 now shutting off tx soon after eclipse, due to batt voltage dropping
below regulator threshold. Recovers to 1w in sun."
>
>Were people still using this bird in eclipse with only 2 out of 6 usable
cells? Perhaps this bird needs to be put on a schedule like AO-27. Can that
be done?
>
>Richard
>K7LWV
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 6
Date: Wed, 23 Nov 2011 13:39:50 +0000
From: B J <va6bmj@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Signal Received From Phobos-Grunt
Message-ID:
<CAP7QzkNPENOaJMJbtOU9MUmGGyXPwSH=89edkDEbiyS_4DJpQQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://www.spaceflightnow.com/news/n1111/23phobosgrunt/
http://www.universetoday.com/91239/contact-established-with-phobos-grunt-space
craft-can-the-mission-go-on/
The spacecraft is operating but whether the mission can proceed remains to
be seen.
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 6, Issue 637
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