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CX2SA > SATDIG 24.09.11 20:04l 458 Lines 15922 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: ARISSat daylightpower recovery time (Mark L. Hammond)
2. Re: ARISSat daylightpower recovery time (andy thomas)
3. UARS (Peter Portanova)
4. Re: NASA Says ... (Ken Ernandes)
5. UARS is gone, but you can still enter the ARISSat-1 Chicken
Little Contest! (Alan P. Biddle)
6. ARRISat-1 SSB QSO w/ WB0KFC (John Papay)
7. Re: ARISSat daylightpower recovery time (Greg D.)
8. Re: ARISSat daylightpower recovery time (andy thomas)
9. ARISSat-1 (Sebastian, W4AS)
----------------------------------------------------------------------
Message: 1
Date: Sat, 24 Sep 2011 06:38:14 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
To: "Richard Ferryman" <g4bbh@xxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat daylightpower recovery time
Message-ID: <caeF1h0044ltuWb05aeFi8@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Dick,
I think the delay is the result of the timer circuit that was mandatory for
its release during the spacewalk from the ISS. The delay timer had to be
there, and there is no way to defeat it, so it just has to run its course
every time it exits eclipse.
As you have probably noticed, the orbit is changing (precessing?) so for a
week or two conditions are favorable in your QTH, then it changes so that
the bird spends much of the overhead time either in eclipse, or just after
eclipse and the bird isn't transmitting. The good news is that it will
"come around again" so that conditions are favorable at a given QTH.
As an admitted telemetry nut myself, it's painful to know the bird is at
high elevation over my QTH, yet no telemetry is being sent or received...but
it'll come back around :)
The truly painful days will be when it's re-entering...doubt we'll get press
like UARS!
73,
Mark N8MH
At 10:35 AM 9/24/2011 +0100, Richard Ferryman wrote:
>Although I have severely limited satellite visibility I have been copying
telemetry from ARISSat1 for some weeks. I live in a valley surrounded by
chalk hills and cliffs over 100 metres higher than me so my visible horizon
is +12 degrees to +18 degrees at best. Also my 3+3 element short crossed
yagi and rotator are in the attic! This worked beautifully when the
satellite batteries held up and now when ARISSat is powered up. However I
notice it can take 10 minutes or more from the time the satellite enters
sunlight until the system bursts into life. At present this means loss of
telemetry at this location when ARISSat is over the Atlantic, and even on
overhead passes if it has been in sunlight for less than 10 minutes.
>Question is why it takes ARISSat so long after entering sunlight before it
starts transmitting? Surely if the batteries have failed high resistance
the voltage should be up within seconds of entering sunlight.
>Dick G4BBH
>_______________________________________________
>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: 2
Date: Sat, 24 Sep 2011 11:49:36 +0100 (BST)
From: andy thomas <andythomasmail@xxxxx.xx.xx>
To: amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat daylightpower recovery time
Message-ID:
<1316861376.78710.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Did not catch the second voice digit! "MET is One shhhhhh" ?But satellite is
switched on.
?
On 18 september the voice announced MET (19 and 21) equalled the time in
sunlight, as I have calculated back using today's keps, within 1 minute.
Allowing for keps 1 week old I think the MET is in fact announcing the time
the satellite "wakes up" as she enters sunlight, but there are no fm
transmissions at that time. The latency is up to 10?-19 minutes (if I had
the second digit I could be more precise,hi!!)
From: andy thomas <andythomasmail@xxxxx.xx.xx>
To: amsat <amsat-bb@xxxxx.xxx>
Sent: Saturday, 24 September 2011, 11:24
Subject: Re:ARISSat daylightpower recovery time
I agree with this observation here at IO92NL.
Arissat-1 does not switch on immediately when in sunlight, I have missed
several passes this morning and in the last few days.
I am just waiting for what the MET is announced (voice tlm) as at 1032 utc
AOS (coming up) and will backtrack to how long she has been in sunlight. The
difference ought to tell us the latency.
73 de andy G0SFJ
------------------------------
Message: 3
Date: Sat, 24 Sep 2011 07:09:53 -0400
From: "Peter Portanova" <wb2oqq@xxxxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] UARS
Message-ID: <7C08B75DB8124390B83AB3654CEE5FAB@xxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
NASA UPDATE
UARS Updatesa.. Update #15
Sat, 24 Sep 2011 03:46:42 AM EDT
NASA's decommissioned Upper Atmosphere Research Satellite fell back to
Earth between 11:23 p.m. EDT Friday, Sept. 23 and 1:09 a.m. EDT Sept. 24.
The Joint Space Operations Center at Vandenberg Air Force Base in California
said the satellite penetrated the atmosphere over the Pacific Ocean. The
precise re-entry time and location are not yet known with certainty.
73's Pete
WB2OQQ
www.massapequanyweather.com
------------------------------
Message: 4
Date: Sat, 24 Sep 2011 07:35:56 -0400
From: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
To: Paolo Mattiolo <mattiolo@xxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: NASA Says ...
Message-ID: <D4C6DFA2-C989-4F1E-B1A0-38DD3F2545A3@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
It is not an uncertainty. A large satellite can break up and different
pieces can re-enter at different times. I experienced this working the
orbital decay of the Apollo 9 Lunar Module back in 1981.
FYI Apollo 9 did a lunar landing rehearsal in Earth orbit.
73 Ken N2WWD
Sent from my iPad
On Sep 24, 2011, at 4:11 AM, Paolo Mattiolo <mattiolo@xxxxx.xxx> wrote:
> That's incredible that NASA still is not sure with precision where the sat
> fall down!!
>
> 73 de in3aqk
>
> On Sat, Sep 24, 2011 at 9:27 AM, Clint Bradford
<clintbradford@xxx.xxx>wrote:
>
>> We can now confirm that #UARS is down! Debris fell to Earth between 11:23
>> p.m. EDT Friday, Sept. 23, and 1:09 a.m. EDT Sept. 24. -NASA
>>
>>
>> Clint Bradford
>> clintbradford@xxx.xxx
>>
>>
>>
>>
>> _______________________________________________
>> 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
>>
>
>
>
> --
> Paolo Mattiolo
> Software developer
>
> http://www.mattiolopaolo.com
> cell:347 9454207
> skype:paolomattiolo
> msn:paolomattiolo@xxxxxxx.xx
> twitter:IN3AQK
>
> ham call sign: IN3AQK
> IQRP N? 715
> _______________________________________________
> 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: 5
Date: Sat, 24 Sep 2011 08:02:02 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Cc: SAREX-BB <SAREX@xxxxx.xxx>
Subject: [amsat-bb] UARS is gone, but you can still enter the
ARISSat-1 Chicken Little Contest!
Message-ID: <C89CD3029BFA48BF8500DD8633AFE1F1@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
All,
Now that everybody has climbed out from under their beds, it might be a good
time to think about entering the ARISSat-1 Chicken Little Contest. We are
still looking for calculations/guesses/darts-in-the-calendar submissions for
when ARRISSat-1 makes its final orbit. We have a fair number of submissions
from all over the world from adults, but very few from students. If you
know of one who might be interested, encourage them to enter. The details
are here:
http://www.amsat.org/amsat-new/ARISSat/ARISSatContest
While it is not going to receive the coverage of UARS, the closest
submissions in each category will be recognized. Right now, the deadline is
the 15th of October, though since ARISSat-1 is "floating like a butterfly"
that MIGHT get extended. TBD. We want to give people enough time to enter.
However, if we wait too long, the window narrows significantly, putting
those who submitted early at a disadvantage.
Alan
WA4SCA
------------------------------
Message: 6
Date: Sat, 24 Sep 2011 11:28:41 -0400
From: John Papay <john@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ARRISat-1 SSB QSO w/ WB0KFC
Message-ID: <502265.51705.qm@xxxxxxx.xxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
ARRISat-1 was in pretty good shape when it finally
turned on after being in eclipse this morning around
1510z or so. I had a good qso with WB0KFC and heard
someone else (maybe N8MH?) at the end of the pass. The
bird went off the air around 1516z before my LOS.
The next pass at 1643z should be good for western and
the southeastern USA. Give it a try. It's 15 degrees for
me but I'll be calling. Run as much power on the uplink
as you have. It doesn't hear very well with a stubby
antenna. Hope to work you.
73,
John K8YSE
------------------------------
Message: 7
Date: Sat, 24 Sep 2011 09:46:20 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
To: andy thomas <andythomasmail@xxxxx.xx.xx>, amsat
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat daylightpower recovery time
Message-ID: <BLU133-W27E7123A36D55C634AB0BEA90E0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Based on posted observations, I have come to the conclusion that the
satellite's MET comes up at either 0 or 1 when the satellite turns on, after
the 10-or-so minute delay after entering sunlight. Depending on what mode
it thinks it should be in, I suppose it's possible that it might in fact be
in one of those power saving quiet periods at that time, and only be heard a
few minutes later. Entering sunlight is not a knife-edged event in orbit;
there's a short ramp in power, so (playing arm-chair engineer here) I expect
it would be in low or emergency power mode for a short while.
Greg KO6TH
> Date: Sat, 24 Sep 2011 11:49:36 +0100
> From: andythomasmail@xxxxx.xx.xx
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: ARISSat daylightpower recovery time
>
> Did not catch the second voice digit! "MET is One shhhhhh" But satellite
is switched on.
>
> On 18 september the voice announced MET (19 and 21) equalled the time in
sunlight, as I have calculated back using today's keps, within 1 minute.
Allowing for keps 1 week old I think the MET is in fact announcing the time
the satellite "wakes up" as she enters sunlight, but there are no fm
transmissions at that time. The latency is up to 10 -19 minutes (if I had
the second digit I could be more precise,hi!!)
>
> From: andy thomas <andythomasmail@xxxxx.xx.xx>
> To: amsat <amsat-bb@xxxxx.xxx>
> Sent: Saturday, 24 September 2011, 11:24
> Subject: Re:ARISSat daylightpower recovery time
>
>
> I agree with this observation here at IO92NL.
>
> Arissat-1 does not switch on immediately when in sunlight, I have missed
several passes this morning and in the last few days.
>
> I am just waiting for what the MET is announced (voice tlm) as at 1032 utc
AOS (coming up) and will backtrack to how long she has been in sunlight. The
difference ought to tell us the latency.
>
> 73 de andy G0SFJ
> _______________________________________________
> 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: 8
Date: Sat, 24 Sep 2011 19:22:17 +0100 (BST)
From: andy thomas <andythomasmail@xxxxx.xx.xx>
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat daylightpower recovery time
Message-ID:
<1316888537.52619.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Interesting
?
My observations last weekend show that MET matches the satellite entering
sunlight:
?
18 September
?
calculated Time into sun: 1004 utc
Time of obs (announcement): 1023 utc
Voice announced MET: 19
?
calculated Time into sun: 1136 utc
Time of obs: 1158 utc
Voice announced MET: 21
?
maybe the voice tlm MET?isn't accurate either!
?
howver I calculated the time of the entering sunlight using the?keps of
24/9, not the keps of 18/9,?via satpc32.
?
73 de andy g0sfj
From: Greg D. <ko6th_greg@xxxxxxx.xxx>
To: andy thomas <andythomasmail@xxxxx.xx.xx>; amsat <amsat-bb@xxxxx.xxx>
Sent: Saturday, 24 September 2011, 17:46
Subject: RE: [amsat-bb] Re: ARISSat daylightpower recovery time
Based on posted observations, I have come to the conclusion that the
satellite's MET comes up at either 0 or 1 when the satellite turns on, after
the 10-or-so minute delay after entering sunlight.? Depending on what mode
it thinks it should be in, I suppose it's possible that it might in fact be
in one of those power saving quiet periods at that time, and only be heard a
few minutes later.? Entering sunlight is not a knife-edged event in orbit;
there's a short ramp in power, so (playing arm-chair engineer here) I expect
it would be in low or emergency power mode for a short while.
Greg? KO6TH
> Date: Sat, 24 Sep 2011 11:49:36 +0100
> From: andythomasmail@xxxxx.xx.xx
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: ARISSat daylightpower recovery time
>
> Did not catch the second voice digit! "MET is One shhhhhh" ?But satellite
is switched on.
> ?
> On 18 september the voice announced MET (19 and 21) equalled the time in
sunlight, as I have calculated back using today's keps, within 1 minute.
Allowing for keps 1 week old I think the MET is in fact announcing the time
the satellite "wakes up" as she enters sunlight, but there are no fm
transmissions at that time. The latency is up to 10?-19 minutes (if I had
the second digit I could be more precise,hi!!)
>
> From: andy thomas <andythomasmail@xxxxx.xx.xx>
> To: amsat <amsat-bb@xxxxx.xxx>
> Sent: Saturday, 24 September 2011, 11:24
> Subject: Re:ARISSat daylightpower recovery time
>
>
> I agree with this observation here at IO92NL.
>
> Arissat-1 does not switch on immediately when in sunlight, I have missed
several passes this morning and in the last few days.
>
> I am just waiting for what the MET is announced (voice tlm) as at 1032 utc
AOS (coming up) and will backtrack to how long she has been in sunlight. The
difference ought to tell us the latency.
>
> 73 de andy G0SFJ
> _______________________________________________
> 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: 9
Date: Sat, 24 Sep 2011 14:43:20 -0400
From: "Sebastian, W4AS" <w4as@xxxxxxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ARISSat-1
Message-ID: <05D3BE43-B052-464E-AE7F-D6CBA002C9B3@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
John K8YSE, thanks again for the QSO on ARISSat-1 today. They're not easy,
but it can be done. That's my third on the bird.
73 de Sebastian, W4AS
------------------------------
_______________________________________________
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 535
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