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CX2SA > SATDIG 27.05.15 13:17l 767 Lines 25439 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. DUCHIFAT-1 (David L Warnberg)
2. Re: PSAT in HRD (Daniel Cussen)
3. Re: DUCHIFAT-1 (Steve Kristoff)
4. rupeshdlad2738.rl@xxxxx.xxx has indicated you're a friend.
Accept? (rupeshdlad2738.rl@xxxxx.xxxx
5. report rx PSAT-1 (Pablo J.M. - LW8EXS)
6. Re; PSAT in HRD (Joe Fitzgerald)
7. Re: PSAT - BRICsat data? (Bob KD7YZ)
8. Re: PSAT - BRICsat data? (David L Warnberg)
9. Listen for LightSail - transmissions stopped (JoAnne Maenpaa)
10. Re: Listen for LightSail - transmissions stopped (KO6TZ Bob)
11. Re: PSAT - BRICsat data? (Daniel Cussen)
12. OSCAR News articles wanted + Adding new sats to SatPC32 and
Gpredict (M5AKA)
13. Re: PSAT - BRICsat data? (Alan)
14. Re: Listen for LightSail - transmissions stopped (Robert McGwier)
15. Re: Listen for LightSail - transmissions stopped (Robert McGwier)
16. Re: Listen for LightSail - transmissions stopped (Bryce Salmi)
----------------------------------------------------------------------
Message: 1
Date: Mon, 25 May 2015 11:56:43 -0400
From: "David L Warnberg" <dwarnberg@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] DUCHIFAT-1
Message-ID: <003601d09703$659d2d40$30d787c0$@xxx>
Content-Type: text/plain; charset="US-ASCII"
40 degree pass at 11:36 EST and I heard nothing.. Anyone heard from this
SAT?
Thanks
David
KK4QOE
------------------------------
Message: 2
Date: Mon, 25 May 2015 17:02:14 +0100
From: Daniel Cussen <dan@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT in HRD
Message-ID:
<CAF3DnKifFkZb2ZGbHaNOtkP_6zx7BLRWie75ka0VKxFd0NJOXw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Amsat is listing the following TLEs on:
http://www.amsat.org/amsat/ftp/keps/current/nasabare.txt
PSAT
1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009
2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
BRICSAT-P
1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009
2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
LIGHTSAIL-1
1 91919U 15999A 15140.67013889 .00040047 00000-0 10233-2 0 00004
2 91919 054.9991 339.9648 0250932 182.3369 074.3135 15.12540571000018
PCSAT and BRCSAT-P are the same
------------------------------
Message: 3
Date: Mon, 25 May 2015 13:14:13 -0400
From: Steve Kristoff <skristof@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] DUCHIFAT-1
Message-ID: <12D4B99CEBE64B61B919299B3CDBFB41@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I heard some digital signals from Duchifat and even decoded something around
11:43 EDT. I'm in southeast Indiana at EM79ji.
I'm sending the telemetry to the Duchifat folks to see what I got.
Steve AI9IN
Oldenburg IN
EM79ji
----- Original Message -----
From: "David L Warnberg" <dwarnberg@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Monday, May 25, 2015 11:56 AM
Subject: [amsat-bb] DUCHIFAT-1
> 40 degree pass at 11:36 EST and I heard nothing.. Anyone heard from this
> SAT?
>
>
>
> Thanks
>
>
>
> David
>
> KK4QOE
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Steve Kristoff
skristof@xxxxxxx.xxx
"A few chords strummed on a ukulele, enough to please a few others beside
yourself, does more good in this world than the combined efforts of all the
financiers and politicians that ever lived." - Frank Littig, Littig's New
Harmony Self Instructor Chords for Ukulele, Banjuke or Taro Patch Fiddle,
Chart Music Publishing House, Chicago, Illinois, 1924
------------------------------
Message: 4
Date: Mon, 25 May 2015 17:05:48 -0500
From: rupeshdlad2738.rl@xxxxx.xxx<xxxx@xxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] rupeshdlad2738.rl@xxxxx.xxx has indicated you're a
friend. Accept?
Message-ID: <0.0.EE.567.1D097361066913A.2DE8@xxxxx.xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Hi,
rupeshdlad2738.rl@xxxxx.xxx wants to follow you.
****** Is rupeshdlad2738.rl@xxxxx.xxx you friend? ******
If Yes please follow the link below:
http://invites.flipmailer.com/signup_e.html?fullname=&email=amsat-bb@xxxxx
.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.x
x@xxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
If No please follow the link below:
http://invites.flipmailer.com/signup_e.html?fullname=&email=amsat-bb@xxxxx
.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.x
x@xxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Follow the link below to remove yourself from all such emails
http://invites.flipmailer.com/uns_inviter.jsp?email=amsat-bb@xxxxx.xxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.xx@xxxxx.xxx
------------------------------
Message: 5
Date: Mon, 25 May 2015 19:54:01 -0300
From: "Pablo J.M. - LW8EXS" <lw8exs@xxxxx.xxx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] report rx PSAT-1
Message-ID: <7856A71AB3FD465EADB10FC836E28678@xxx>
Content-Type: text/plain; charset="iso-8859-1"
TIME UTC 22:48
2:Fm PSAT-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [19:48:08R]
T#381,840,089,671,824,808,00011100
Pablo - LW8EXS
Buenos Aires - Argetina
------------------------------
Message: 6
Date: Tue, 26 May 2015 12:32:43 -0400
From: "Joe Fitzgerald" <jfitzgerald@xxxx.xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re; PSAT in HRD
Message-ID: <2f778344dc6e72d8496031f1ce47c72d.squirrel@xxxx.xxx.xxx>
Content-Type: text/plain;charset=iso-8859-1
>Is there an old 'PSAT' ?
AMSAT has never listed any other spacecraft as PSAT.
In general, the TLE's in nasabare.txt are the best available and are
updated as significantly better element sets present themselves. In the
last week I have been using elements provided by USNA and the Planetary
Society as appropriate for PSAT, BRICsat and Lightsail. Once NORAD has
sorted out all the objects from this launch, they will be updated weekly
with the other objects in nasabare.txt
ISS continues to be updated at least daily with data from NASA Johnson
space flight center.
- Joe KM1P
------------------------------
Message: 7
Date: Tue, 26 May 2015 14:27:00 -0400
From: Bob KD7YZ <kd7yz@xxxxxxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT - BRICsat data?
Message-ID: <5564BAF4.10700@xxxxxxxxxxx.xx>
Content-Type: text/plain; charset=utf-8
On 25-May-15 1031, Robert Bruninga wrote:
> We need people (who have time) to concentrate on capturing data from
> BRICsat on 437.975 9600 baud.
I'm using satpc32. where do I find the elements for BRICsat? I don't see
it in the 'Groups' .
73,
--
Bob KD7YZ
http://www.qrz.com/db/kd7yz
AMSAT LM#901
------------------------------
Message: 8
Date: Tue, 26 May 2015 14:46:56 -0400
From: "David L Warnberg" <dwarnberg@xxxxxxx.xxx>
To: "'Bob KD7YZ'" <kd7yz@xxxxxxxxxxx.xx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] PSAT - BRICsat data?
Message-ID: <004e01d097e4$574dd280$05e97780$@xxx>
Content-Type: text/plain; charset=US-ASCII
I did not see any elements for BRICSat however it does show up now on the
AMSAT prediction page..
http://www.amsat.org/amsat-new/tools/predict/satloc.php?lang=en&satellite=BR
ICSAT-P
Thanks
David, KK4QOE
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Bob KD7YZ
Sent: Tuesday, May 26, 2015 2:27 PM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT - BRICsat data?
On 25-May-15 1031, Robert Bruninga wrote:
> We need people (who have time) to concentrate on capturing data from
> BRICsat on 437.975 9600 baud.
I'm using satpc32. where do I find the elements for BRICsat? I don't see it
in the 'Groups' .
73,
--
Bob KD7YZ
http://www.qrz.com/db/kd7yz
AMSAT LM#901
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Tue, 26 May 2015 17:00:53 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Listen for LightSail - transmissions stopped
Message-ID: <006301d097ff$6fda5a60$4f8f0f20$@xxx>
Content-Type: text/plain; charset="us-ascii"
Just read on-line at http://planet.ly/0gVop (Planetary Society) that the
LightSail satellite stopped transmitting. The team is attempting a reboot.
The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600 bps
FSK.
Excerpt from their page ...
As of late Friday afternoon, LightSail was continuing to operate normally.
The spacecraft's ground stations at Cal Poly San Luis Obispo and Georgia
Tech were receiving data on each pass. Power and temperature readings were
trending stably, and the spacecraft was in good health.
But inside the spacecraft's Linux-based flight software, a problem was
brewing. Every 15 seconds, LightSail transmits a telemetry beacon packet.
The software controlling the main system board writes corresponding
information to a file called beacon.csv. If you're not familiar with CSV
files, you can think of them as simplified spreadsheets-in fact, most can be
opened with Microsoft Excel.
As more beacons are transmitted, the file grows in size. When it reaches 32
megabytes-roughly the size of ten compressed music files-it can crash the
flight system. The manufacturer of the avionics board corrected this glitch
in later software revisions. But alas, LightSail's software version doesn't
include the update.
Late Friday, the LightSail team received a heads-up warning them of the
vulnerability. A fix was quickly devised to prevent the spacecraft from
crashing, and it was scheduled to be uploaded during the next ground station
pass. But before that happened, LightSail's automated chirps fell silent.
The last data packet received from the spacecraft was May 22 at 21:31 UTC
(5:31 p.m. EDT).
A LightSail map tracking application is at:
http://sail.planetary.org/missioncontrol
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
AMSAT VP User Services
------------------------------
Message: 10
Date: Tue, 26 May 2015 16:57:44 -0700
From: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Listen for LightSail - transmissions stopped
Message-ID: <55650878.2020700@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Confirmed, nothing heard on the 23:45utc Pacific pass 5/26/15.
KO6TZ
------------------------------
Message: 11
Date: Wed, 27 May 2015 09:01:16 +0100
From: Daniel Cussen <dan@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT - BRICsat data?
Message-ID:
<CAF3DnKiTN_XMfQsM0cwHkSfvoNb+sYC8K3GCn-vP3DJE5qRnHA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
On 26/05/2015, David L Warnberg <dwarnberg@xxxxxxx.xxx> wrote:
> I did not see any elements for BRICSat however it does show up now on the
> AMSAT prediction page..
BRICSAT-P
1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009
2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
This is based on predicted launch data, nothing better available yet.
------------------------------
Message: 12
Date: Wed, 27 May 2015 08:47:23 +0000 (UTC)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] OSCAR News articles wanted + Adding new sats to
SatPC32 and Gpredict
Message-ID:
<435288302.113428.1432716443679.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Any articles for the next issue of the AMSAT-UK publication OSCAR News would
be gratefully received by the Editors Jim Heck G3WGM and Graham Shirville
G3VZV. Their contact details are at
http://amsat-uk.org/about/contact-us/
The LightSail satellite has stopped transmitting. The team is attempting a
reboot.The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600
bps FSK.
http://amsat-uk.org/2015/05/26/lightsail-1-stops-transmitting/
UK radio amateurs use PSK31 satellite transponder
http://amsat-uk.org/2015/05/26/uk-hams-use-psk31-transponder/
29 MHz ? the forgotten frequency for amateur radio satellites
http://amsat-uk.org/2015/05/25/29-mhz-satellite-uplinks/
Nine CAS-3 amateur radio satellites to launch in July
http://amsat-uk.org/2015/05/24/nine-cas-3-ham-radio-satellites/
Adding new satellites to SatPC32, Gpredict and Nova
http://amsat-uk.org/2013/11/23/adding-new-satellites-to-satpc32/
73 Trevor M5AKA
----
AMSAT-UK http://amsat-uk.org/
Twitter?https://twitter.com/AmsatUK
Facebook?https://facebook.com/AmsatUK
----
------------------------------
Message: 13
Date: Wed, 27 May 2015 05:14:55 -0500
From: Alan <wa4sca@xxxxx.xxx>
To: <dan@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] PSAT - BRICsat data?
Message-ID: <000601d09865$fb3333a0$f1999ae0$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Because the primary payload was classified, they are being very slow in
providing the Keps for the
other spacecraft.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Daniel Cussen
<Sent: Wednesday, May 27, 2015 3:01 AM
<To: amsat-bb@xxxxx.xxx
<Subject: Re: [amsat-bb] PSAT - BRICsat data?
<
<On 26/05/2015, David L Warnberg <dwarnberg@xxxxxxx.xxx> wrote:
<> I did not see any elements for BRICSat however it does show up now on the
<> AMSAT prediction page..
<
<BRICSAT-P
<1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009
<2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
<
<This is based on predicted launch data, nothing better available yet.
<_______________________________________________
<Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
<to all interested persons worldwide without requiring membership. Opinions
expressed
<are solely those of the author, and do not reflect the official views of
AMSAT-NA.
<Not an AMSAT-NA member? Join now to support the amateur satellite program!
<Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 14
Date: Wed, 27 May 2015 06:47:21 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: JoAnne Maenpaa <k9jkm@xxxxxxx.xxx>
Cc: amsat bb <AMSAT-BB@xxxxx.xxx>
Subject: Re: [amsat-bb] Listen for LightSail - transmissions stopped
Message-ID:
<CA+K5gzf5ZkVrLYA-ZvBZwz-MRNtTQqpzpw66Y51C0+63wZ99Uw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Good grief.
On Tue, May 26, 2015 at 6:00 PM, JoAnne Maenpaa <k9jkm@xxxxxxx.xxx> wrote:
> Just read on-line at http://planet.ly/0gVop (Planetary Society) that the
> LightSail satellite stopped transmitting. The team is attempting a reboot.
> The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600 bps
> FSK.
>
> Excerpt from their page ...
> As of late Friday afternoon, LightSail was continuing to operate normally.
> The spacecraft's ground stations at Cal Poly San Luis Obispo and Georgia
> Tech were receiving data on each pass. Power and temperature readings were
> trending stably, and the spacecraft was in good health.
>
> But inside the spacecraft's Linux-based flight software, a problem was
> brewing. Every 15 seconds, LightSail transmits a telemetry beacon packet.
> The software controlling the main system board writes corresponding
> information to a file called beacon.csv. If you're not familiar with CSV
> files, you can think of them as simplified spreadsheets-in fact, most can
> be
> opened with Microsoft Excel.
>
> As more beacons are transmitted, the file grows in size. When it reaches 32
> megabytes-roughly the size of ten compressed music files-it can crash the
> flight system. The manufacturer of the avionics board corrected this glitch
> in later software revisions. But alas, LightSail's software version doesn't
> include the update.
>
> Late Friday, the LightSail team received a heads-up warning them of the
> vulnerability. A fix was quickly devised to prevent the spacecraft from
> crashing, and it was scheduled to be uploaded during the next ground
> station
> pass. But before that happened, LightSail's automated chirps fell silent.
> The last data packet received from the spacecraft was May 22 at 21:31 UTC
> (5:31 p.m. EDT).
>
> A LightSail map tracking application is at:
> http://sail.planetary.org/missioncontrol
>
> --
> 73 de JoAnne K9JKM
> k9jkm@xxxxx.xxx
> AMSAT VP User Services
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
--
Bob McGwier
Co-Founder and Technical Director, Federated Wireless, LLC
Research Professor Virginia Tech
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
------------------------------
Message: 15
Date: Wed, 27 May 2015 06:48:37 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: JoAnne Maenpaa <k9jkm@xxxxxxx.xxx>
Cc: amsat bb <AMSAT-BB@xxxxx.xxx>
Subject: Re: [amsat-bb] Listen for LightSail - transmissions stopped
Message-ID:
<CA+K5gzdNi_91na=kNoTuqskBemm0hHnQ-j00NA_SjC3w-qtu4Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
The reboot will work but only if it erases beacon.csv otherwise it will
crash on the first telemetry packet.
On Tue, May 26, 2015 at 6:00 PM, JoAnne Maenpaa <k9jkm@xxxxxxx.xxx> wrote:
> Just read on-line at http://planet.ly/0gVop (Planetary Society) that the
> LightSail satellite stopped transmitting. The team is attempting a reboot.
> The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600 bps
> FSK.
>
> Excerpt from their page ...
> As of late Friday afternoon, LightSail was continuing to operate normally.
> The spacecraft's ground stations at Cal Poly San Luis Obispo and Georgia
> Tech were receiving data on each pass. Power and temperature readings were
> trending stably, and the spacecraft was in good health.
>
> But inside the spacecraft's Linux-based flight software, a problem was
> brewing. Every 15 seconds, LightSail transmits a telemetry beacon packet.
> The software controlling the main system board writes corresponding
> information to a file called beacon.csv. If you're not familiar with CSV
> files, you can think of them as simplified spreadsheets-in fact, most can
> be
> opened with Microsoft Excel.
>
> As more beacons are transmitted, the file grows in size. When it reaches 32
> megabytes-roughly the size of ten compressed music files-it can crash the
> flight system. The manufacturer of the avionics board corrected this glitch
> in later software revisions. But alas, LightSail's software version doesn't
> include the update.
>
> Late Friday, the LightSail team received a heads-up warning them of the
> vulnerability. A fix was quickly devised to prevent the spacecraft from
> crashing, and it was scheduled to be uploaded during the next ground
> station
> pass. But before that happened, LightSail's automated chirps fell silent.
> The last data packet received from the spacecraft was May 22 at 21:31 UTC
> (5:31 p.m. EDT).
>
> A LightSail map tracking application is at:
> http://sail.planetary.org/missioncontrol
>
> --
> 73 de JoAnne K9JKM
> k9jkm@xxxxx.xxx
> AMSAT VP User Services
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
--
Bob McGwier
Co-Founder and Technical Director, Federated Wireless, LLC
Research Professor Virginia Tech
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
------------------------------
Message: 16
Date: Wed, 27 May 2015 11:07:11 +0000
From: Bryce Salmi <bryce.salmi@xxxxx.xxx>
To: Robert McGwier <rwmcgwier@xxxxx.xxx>, JoAnne Maenpaa
<k9jkm@xxxxxxx.xxx>
Cc: amsat bb <AMSAT-BB@xxxxx.xxx>
Subject: Re: [amsat-bb] Listen for LightSail - transmissions stopped
Message-ID:
<CAN5j0sqjpcWCsCMd=mtD4NHgTy4LS+RQtYFsxEgtNzsa5-ZWwQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
This is a good example of "let the engineering unit run over the weekend"
Bryce
On Wed, May 27, 2015 at 03:49 Robert McGwier <rwmcgwier@xxxxx.xxx> wrote:
> The reboot will work but only if it erases beacon.csv otherwise it will
> crash on the first telemetry packet.
>
> On Tue, May 26, 2015 at 6:00 PM, JoAnne Maenpaa <k9jkm@xxxxxxx.xxx> wrote:
>
> > Just read on-line at http://planet.ly/0gVop (Planetary Society) that the
> > LightSail satellite stopped transmitting. The team is attempting a
> reboot.
> > The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600 bps
> > FSK.
> >
> > Excerpt from their page ...
> > As of late Friday afternoon, LightSail was continuing to operate
> normally.
> > The spacecraft's ground stations at Cal Poly San Luis Obispo and Georgia
> > Tech were receiving data on each pass. Power and temperature readings
> were
> > trending stably, and the spacecraft was in good health.
> >
> > But inside the spacecraft's Linux-based flight software, a problem was
> > brewing. Every 15 seconds, LightSail transmits a telemetry beacon packet.
> > The software controlling the main system board writes corresponding
> > information to a file called beacon.csv. If you're not familiar with CSV
> > files, you can think of them as simplified spreadsheets-in fact, most can
> > be
> > opened with Microsoft Excel.
> >
> > As more beacons are transmitted, the file grows in size. When it reaches
> 32
> > megabytes-roughly the size of ten compressed music files-it can crash the
> > flight system. The manufacturer of the avionics board corrected this
> glitch
> > in later software revisions. But alas, LightSail's software version
> doesn't
> > include the update.
> >
> > Late Friday, the LightSail team received a heads-up warning them of the
> > vulnerability. A fix was quickly devised to prevent the spacecraft from
> > crashing, and it was scheduled to be uploaded during the next ground
> > station
> > pass. But before that happened, LightSail's automated chirps fell silent.
> > The last data packet received from the spacecraft was May 22 at 21:31 UTC
> > (5:31 p.m. EDT).
> >
> > A LightSail map tracking application is at:
> > http://sail.planetary.org/missioncontrol
> >
> > --
> > 73 de JoAnne K9JKM
> > k9jkm@xxxxx.xxx
> > AMSAT VP User Services
> >
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions
> > expressed
> > are solely those of the author, and do not reflect the official views of
> > AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> >
>
>
>
> --
> Bob McGwier
> Co-Founder and Technical Director, Federated Wireless, LLC
> Research Professor Virginia Tech
> Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
> Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 10, Issue 148
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