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CX2SA > SATDIG 30.04.08 14:58l 875 Lines 27665 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Seed Over CHILE Audio (Raul Romero CA3SOC)
2. DelfiC3 heard 29-April 18:23UTC - 18:29UTC. (Jeroen Vreeken)
3. SEEDS and Delfi-C3 over West Malaysia (Sion Chow Q. C. (9W2QC))
4. Seed Over CHILE Audio (Raul Romero CA3SOC)
5. Re: ao27.org possible schedule error? (George Henry)
6. Emergency in Cute-1.7 (Hiroki Ashida)
7. Re: Delphi c3 (Alan Cresswell)
8. Re: SEEDS and Delfi-C3 over West Malaysia
(Sion Chow Q. C. (9W2QC))
9. Re: Delphi C3 (Wouter Jan Ubbels)
10. Two CubeSats TLE decided (Mineo Wakita)
11. Re: Delphi c3 (Piero Baudino)
12. Jules Verne boosts ISS orbit (uschndr(AT)zedat.fu-berlin.de)
13. C3 heard at KM17VX (Kostas Ioannidis)
14. Delfi-C3 status update 30 April 2008 08:00 UTC
(Wouter Jan Ubbels)
15. C3 heard at KM17VX (Kostas Ioannidis)
16. Re: Delfi-C3 status update 30 April 2008 08:00 UTC
(Robert Turlington)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Apr 2008 22:57:32 -0400
From: "Raul Romero CA3SOC" <ce3soc(AT)gmail.com>
Subject: [amsat-bb] Seed Over CHILE Audio
To: "Amsat-Bb(AT)Amsat.Org" <amsat-bb(AT)amsat.org>
Message-ID: <CCC276DB095D461880A706FA8802669D(AT)p42800>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: Raul Romero CA3SOC
To: Amsat-Bb(AT)Amsat.Org
Sent: Tuesday, April 29, 2008 10:39 PM
Subject: Seed Over CHILE Audio
Rec in mid Pass Over Chile
http://ce3soc.no-ip.org/
080429_001.wav
Rig Icom IC-PCR1500 5 Elem Hor Yagui
73
Raul
CA3SOC
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Message: 2
Date: Tue, 29 Apr 2008 21:17:14 +0200
From: Jeroen Vreeken <pe1rxq(AT)amsat.org>
Subject: [amsat-bb] DelfiC3 heard 29-April 18:23UTC - 18:29UTC.
To: Cor <spacecor(AT)hetnet.nl>
Cc: amsat-bb(AT)amsat.org
Message-ID: <4817743A.6090607(AT)amsat.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Cor wrote:
> At 18:29UTC signal stopped direct, maybe mission
>
> control team knows why.
My guess is LOS.... Object 32787 had a predicted LOS at 18:29:43 over
Eindhoven.
I lost the signal within seconds from that. (It took a few seconds
before I hit a key to create a timestamp which was at 18:29:46)
73,
Jeroen PE1RXQ
------------------------------
Message: 3
Date: Wed, 30 Apr 2008 11:23:00 +0800
From: "Sion Chow Q. C. \(9W2QC\)" <9w2qc(AT)9w2qc.net>
Subject: [amsat-bb] SEEDS and Delfi-C3 over West Malaysia
To: <amsat-bb(AT)amsat.org>, "'seeds message'"
<seeds_message(AT)forth.aero.cst.nihon-u.ac.jp>,
<missioncontrol(AT)delfic3.nl>
Cc: 'Sangat Singh' <sangatsingh(AT)gmail.com>
Message-ID: <000a01c8aa71$8298d6a0$87ca83e0$(AT)net>
Content-Type: text/plain; charset="US-ASCII"
Dear All,
Had another 57 degree pass of SEEDS and Delfi-C3 over West Malaysia at 1055
hours local or 0255 hours UTC. Again, I was tracking object C, but SEEDS
was heard for about 2 minutes more after LOS.
This time, unfortunately nothing was heard from Delfi-C3 on 145.870 MHz +/-
and 145.930 MHz +/-. SEEDS was very strong though, with occasional QSB.
Attempted to try to listen to Cute-1.7+APDII, COMPASS-1 and AAUSAT-II but
unfortunately did not hear any signals.
The MP3 recording of SEEDS will be posted shortly. Equipment used this time
were VHF - IC910H, 2x10 H-Yagi, SB-2000 Preamp and UHF - FT-847, 2x15
H-Yagi, SB-7000 Preamp.
73,
Sion Chow Q. C.,
9W2QC.
------------------------------
Message: 4
Date: Tue, 29 Apr 2008 22:39:33 -0400
From: "Raul Romero CA3SOC" <ce3soc(AT)gmail.com>
Subject: [amsat-bb] Seed Over CHILE Audio
To: "Amsat-Bb(AT)Amsat.Org" <amsat-bb(AT)amsat.org>
Message-ID: <289158EAAE464AE6B9603A77DE830D54(AT)p42800>
Content-Type: text/plain; charset="iso-8859-1"
Rec in mid Pass Over Chile
http://ce3soc.no-ip.org/
080429_001.wav
Rig Icom IC-PCR1500 5 Elem Hor Yagui
73
Raul
CA3SOC
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Message: 5
Date: Tue, 29 Apr 2008 22:30:29 -0500
From: "George Henry" <ka3hsw(AT)earthlink.net>
Subject: [amsat-bb] Re: ao27.org possible schedule error?
To: "amsat bb" <amsat-bb(AT)amsat.org>
Message-ID: <019d01c8aa72$8a82a2f0$0400a8c0(AT)parents>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Since my son graduated from RIT last May, he may lose the hosting of the
program on the rit.edu site at any time. Just in case, I am now hosting the
program at http://home.earthlink.net/~ka3hsw/ao27/ as well.
Enjoy!!!
George, KA3HSW
----- Original Message -----
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb(AT)wd9ewk.net>
To: <amsat-bb(AT)amsat.org>
Sent: Tuesday, April 29, 2008 12:58 AM
Subject: [amsat-bb] Re: ao27.org possible schedule error?
[snip]
> Do you have the AO-27 Satellite Scheduler program available from:
>
> http://www.cs.rit.edu/~cjh9783/programs/satsched.php
>
> It requires the Java Runtime Environment on your computer, and there are
> versions that will run on any OS with Java or one specifically for Windows
> (still needs Java installed). This will get you closer to the schedule on
> the
> satellite, keeping in mind the statement on http://www.ao27.org/ that the
> onboard clock is fast by 0.7 seconds/day from when the last schedule
> was put into effect (currently, from 8 March 2008).
>
> Comparing the program with the web site, it appears there is a discrepancy
> of around 7 minutes (not accounting for onboard clock issues). If you can
> get the program to determine the onboard schedule instead of using the
> web site, that would probably be a good thing. Or use your program to
> determine approximately when AO-27 crosses 29 degrees North, to get an
> approximate idea when the satellite's repeater should be available.
>
> 73!
>
>
>
> Patrick WD9EWK/VA7EWK
------------------------------
Message: 6
Date: Wed, 30 Apr 2008 12:34:44 +0900
From: Hiroki Ashida <hiroki(AT)lss.mes.titech.ac.jp>
Subject: [amsat-bb] Emergency in Cute-1.7
To: AMSAT Bulletin Board <amsat-bb(AT)amsat.org>
Message-ID: <4817E8D4.6030102(AT)lss.mes.titech.ac.jp>
Content-Type: text/plain; charset=ISO-2022-JP
Hello All,
I'd like to inform you about the current status of our satellite,
Cute-1.7 + APD II.
There has been some strange behaviours on Cute that the battery voltage
is very low in the FM packet though it is nominal value in the CW frame.
The level of the voltage from FM packet indicates that our satellite may
be in danger.
We've been investigating the problem but informations we have are very
small, so I'd like to appeal for your kind cooperation.
Our satellite transmits its beacon at 437.275MHz by CW(Morse Code) and
the beacon includes the battery voltage.
Details are explained in the web-page:
http://lss.mes.titech.ac.jp/ssp/cute1.7/cwtelemetry_e.html
There's no FM telemetry transmission excpept over Japan but CW
information is remakably helpful for us.
If you have any questions, please don't hesitate to contact me.
Best Regards,
Hiroki
Cute-1.7 + APD II
--
Hiroki Ashida <hiroki(AT)lss.mes.titech.ac.jp>
Laboratory for Space Systems
Department of Mechano-Aerospace Engineering
Tokyo Institute of Technology
TEL/FAX : +81-3-5734-2644
Room 554, Ishikawadai 1st Bldg, Tokyo Institute of Technology
2-12-1 O-okayama, Meguro-ku, Tokyo, Japan
------------------------------
Message: 7
Date: Tue, 29 Apr 2008 03:34:55 -0000
From: "Alan Cresswell" <alancresswell(AT)xtra.co.nz>
Subject: [amsat-bb] Re: Delphi c3
To: <amsat-bb(AT)amsat.org>
Message-ID: <000401c8a9a9$fea2d2f0$0301010a(AT)Cresswell2>
Content-Type: text/plain; charset="us-ascii"
Hi David,
Yes we can rule out antenna squint because the second pass this morning
(2217 UT) was very strong horizon to horizon. Nothing heard on the
previous pass and VK's report nothing on the next pass so something seems to
be turning Delphi off before it gets down this way. Unfortunately all
ascending node passes (Today 9:45pm local and 11:22pm local) are all well
into eclipse so we only see a couple of descending node passes in the
mornings here. Having only heard the one pass it seemed to be in what the
control team described as "emergency mode". I had good sync lock but no
packets and it certainly sounded much different from the Demo file which
decodes perfectly.
I guess we just keep monitoring and waiting down under!
73
Alan
ZL2BX
-----Original Message-----
From: g0mrf(AT)aol.com [mailto:g0mrf(AT)aol.com]
Sent: Wednesday, 30 April 2008 01:14
To: alancresswell(AT)xtra.co.nz
Subject: Re: [amsat-bb] Delphi c3
Hi Alan.
I think you're right. Even the teams own news pages say that they have
trouble in the morning asending passes, while the evening passes here in
Europe are all fine.
Possibly a squint problem, but my feeling is that it could be the software
latching up after half a pass or so.
I note that the evening passes here are all just after exiting eclipse and
hence the satellite is 'reset'
What are the ascending passes like with you?
Thanks
David
Once again nothing heard from Delphi over NZ on the 2041UT 36deg fully
sunlit pass. Good signals from SEEDS, CUTE1.7 and even chirpy COMPASS.
I note that stations reporting no signal today are all reporting on
descending node passes while good signal reports are once again reporting on
ascending node passes.
Unless Delphi is turning off Southbound best guess would be an antenna
squint effect. Are any stations reporting reception on Southbound passes?
-----Original Message-----
From: Alan Cresswell <alancresswell(AT)xtra.co.nz>
To: amsat-bb(AT)amsat.org
Sent: Tue, 29 Apr 2008 22:01
Subject: [amsat-bb] Delphi c3
Hi
Once again nothing heard from Delphi over NZ on the 2041UT 36deg fully
sunlit pass. Good signals from SEEDS, CUTE1.7 and even chirpy COMPASS.
I note that stations reporting no signal today are all reporting on
descending node passes while good signal reports are once again reporting on
ascending node passes.
Unless Delphi is turning off Southbound best guess would be an antenna
squint effect. Are any stations reporting reception on Southbound passes?
Alan
ZL2BX
_______________________________________________
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
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------------------------------
Message: 8
Date: Wed, 30 Apr 2008 11:56:15 +0800
From: "Sion Chow Q. C. \(9W2QC\)" <9w2qc(AT)9w2qc.net>
Subject: [amsat-bb] Re: SEEDS and Delfi-C3 over West Malaysia
To: <amsat-bb(AT)amsat.org>, "'seeds message'"
<seeds_message(AT)forth.aero.cst.nihon-u.ac.jp>
Cc: 'Sangat Singh' <sangatsingh(AT)gmail.com>
Message-ID: <001201c8aa76$2cb2fe50$8618faf0$(AT)net>
Content-Type: text/plain; charset="US-ASCII"
As promised, here are the MP3 recordings for the two passes of SEEDS below:
AOS - LOS of Object C --> http://www.9w2qc.net/amsatbb/seeds30apr1055.mp3
After LOS of Object C --> http://www.9w2qc.net/amsatbb/seeds30apr1055-1.mp3
73,
Sion Chow Q. C.,
9W2QC.
> -----Original Message-----
> From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]
On
> Behalf Of Sion Chow Q. C. (9W2QC)
> Sent: Wednesday, April 30, 2008 11:23 AM
> To: amsat-bb(AT)amsat.org; 'seeds message'; missioncontrol(AT)delfic3.nl
> Cc: 'Sangat Singh'
> Subject: [amsat-bb] SEEDS and Delfi-C3 over West Malaysia
>
> Dear All,
>
>
>
> Had another 57 degree pass of SEEDS and Delfi-C3 over West Malaysia at
> 1055
> hours local or 0255 hours UTC. Again, I was tracking object C, but
> SEEDS
> was heard for about 2 minutes more after LOS.
>
>
>
> This time, unfortunately nothing was heard from Delfi-C3 on 145.870 MHz
> +/-
> and 145.930 MHz +/-. SEEDS was very strong though, with occasional
> QSB.
> Attempted to try to listen to Cute-1.7+APDII, COMPASS-1 and AAUSAT-II
> but
> unfortunately did not hear any signals.
>
>
>
> The MP3 recording of SEEDS will be posted shortly. Equipment used this
> time
> were VHF - IC910H, 2x10 H-Yagi, SB-2000 Preamp and UHF - FT-847, 2x15
> H-Yagi, SB-7000 Preamp.
>
>
>
> 73,
>
> Sion Chow Q. C.,
>
> 9W2QC.
>
> _______________________________________________
> 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
------------------------------
Message: 9
Date: Wed, 30 Apr 2008 07:30:33 +0200
From: "Wouter Jan Ubbels" <wjubbels(AT)gmail.com>
Subject: [amsat-bb] Re: Delphi C3
To: "Alan Cresswell" <alancresswell(AT)xtra.co.nz>
Cc: gerard(AT)delfic3.nl, amsat-bb(AT)amsat.org
Message-ID:
<af4c9b1b0804292230g10f05644y209ce75e5db94e32(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi Alan,
excellent!
thanks a lot. Can you email your wav file to missioncontrol(AT)delfic3.nl ?
that would be great!
Keep listening, we plan to issue a status update today.
73
Wouter Jan Ubbels
On Wed, Apr 30, 2008 at 1:00 AM, Alan Cresswell <alancresswell(AT)xtra.co.nz>
wrote:
> Bram
>
>
>
> Well knock me down with a feather!
>
>
>
> Suddenly Delphi has burst into life in this part of the world!
>
> Strong signals during the entire 2217UT 20 Deg pass.
>
> LOS at 2217, 1deg within about 30 seconds of predicted.
>
> Seems to have been in its "emergency mode". Good sync but no packets
> decoded.
>
>
>
> I have a 68Mb wave file (manual Doppler on that pass) if required.
>
>
>
> Alan
>
> ZL2BX
>
> _______________________________________________
> 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
>
------------------------------
Message: 10
Date: Wed, 30 Apr 2008 15:04:07 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] Two CubeSats TLE decided
To: amsat-bb(AT)amsat.org
Message-ID: <2DC8AA8800237Bei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=us-ascii
In Space-Track:
32783 OBJECT A = CARTSAT 2A
32792 OBJECT K = RUBIN 8/PSLV
------------------------------
Message: 11
Date: Wed, 30 Apr 2008 08:11:08 +0200
From: Piero Baudino <pbaudino(AT)formatnet.it>
Subject: [amsat-bb] Re: Delphi c3
To: Alan Cresswell <alancresswell(AT)xtra.co.nz>
Cc: amsat-bb(AT)amsat.org
Message-ID: <48180D7C.9070500(AT)formatnet.it>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Alan Cresswell ha scritto:
> Hi
>
>
>
> Once again nothing heard from Delphi over NZ on the 2041UT 36deg fully
> sunlit pass. Good signals from SEEDS, CUTE1.7 and even chirpy COMPASS.
>
> I note that stations reporting no signal today are all reporting on
> descending node passes while good signal reports are once again reporting on
> ascending node passes.
>
> Unless Delphi is turning off Southbound best guess would be an antenna
> squint effect. Are any stations reporting reception on Southbound passes?
>
Hi Alan and the list,
I think I can confirm your idea about ascending node passes.
Yesterday evening, I heard for my first ascending pass starting at about
19.50 UTC and the signal was very good (about S5 sometimes) with
circular polarization changes, so I was able to decode some TLM frames
for the first time....
Long life to Delfi-C3!
'73 de Piero IZ1ERR
------------------------------
Message: 12
Date: Wed, 30 Apr 2008 09:34:28 +0200 (CEST)
From: uschndr(AT)zedat.fu-berlin.de
Subject: [amsat-bb] Jules Verne boosts ISS orbit
To: amsat-bb(AT)amsat.org
Message-ID:
<1164.195.254.226.86.1209540868.webmail(AT)portal.zedat.fu-berlin.de>
Content-Type: text/plain;charset=iso-8859-1
>From ESA Portal http://www.esa.int/esaCP/index.html
73, Udo,DL7OL
=====================================================
ATV demonstrated its ability to raise orbit of ISS
Jules Verne boosts ISS orbit
25 April 2008
ESA's Jules Verne ATV was used for the first time early this morning
to raise the orbit of the International Space Station. A 740-second
burn of the Automated Transfer Vehicle's main engines successfully
lifted the altitude of the 280-tonne Station by around 4.5 km to a
height of 342 km above the Earth's surface.
After the ATV Control Centre (ATV-CC) in Toulouse, France, had
'woken up' Jules Verne ATV, the manoeuvre started at 06:22 CEST
(04:22 GMT) this morning and provided a 2.65 m/s thrust using two of
the ATV's four main engines. Controllers at ATV-CC closely monitored
ATV's subsystems throughout the long manoeuvre.
"The Station's altitude naturally decreases with atmospheric drag.
Until now this has been compensated for by performing a re-boost
using the Russian Progress, the Space Shuttle or by the ISS itself,"
explains Alberto Novelli, ESAs Mission Director at ATV-CC. "Today,
ATV has successfully demonstrated that it too is able to perform
this vital function. Only Progress and ATV can provide this high
level of re-boost. ATV is unique due to the quantity of fuel
available for such manoeuvres."
The re-boost manoeuvre comes just three weeks after Jules Verne ATV
successfully docked with ISS on 3 April 2008 delivering 1150 kg of
dry cargo, including food, clothes and equipment, as well as
additional supplies of water, oxygen and fuel. Since then, the
European ISS resupply spacecraft has been in dormant mode attached
to the docking port on the Russian Zvezda module.
Today's re-boost sets up the International Space Station for the
arrival of Space Shuttle Discovery on the STS-124 mission to deliver
the Japanese Kibo laboratory. STS-124 is currently targeted for
launch on 31 May 2008. Further re-boost manoeuvres using ATV are
scheduled for 12 June, 8 July and 6 August.
Jules Verne ATV is scheduled to remain docked to the International
Space Station until early August. At the end of its mission, Jules
Verne, loaded with up to 6.5 tonnes of material no longer required
by the ISS, will undock and then burn up completely during a guided
and controlled re-entry high over the Pacific Ocean.
------------------------------
Message: 13
Date: Wed, 30 Apr 2008 10:54:34 +0300
From: "Kostas Ioannidis" <kostas.ioannidis(AT)gmail.com>
Subject: [amsat-bb] C3 heard at KM17VX
To: AMSAT-BB(AT)amsat.org
Message-ID:
<6cd5903a0804300054h346d19e7ycd8cfa1f7af33274(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
C3 heard over km17vx.Packets recieved and uploaded ok.At 7:50 utc
transmission at 145.930 stopped.
73 de sw1ixp
------------------------------
Message: 14
Date: Wed, 30 Apr 2008 10:16:58 +0200
From: "Wouter Jan Ubbels" <wjubbels(AT)gmail.com>
Subject: [amsat-bb] Delfi-C3 status update 30 April 2008 08:00 UTC
To: amsat-bb(AT)amsat.org
Cc: rascal(AT)delfic3.nl
Message-ID:
<af4c9b1b0804300116t3809ca99qe5dd18be9161e194(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi all,
Delfi-C3 is in orbit and healthy, despite some minor issues, please find a
status update below:
1. Telemetry indicates that all solar panels and antennas have deployed
properly
2. Telemetry indicates nominal values for all housekeeping values
3. We have already obtained payload data, and have been able to generate IV
curves of the Thin Film Solar Cell experiment, note that those uring
RASCAL can view the IV curves by clicking Options-->show IV curves in
RASCAL.
4. The spacecraft is operating in science mode, we have had one orbit in
emergency mode, which was most probably due to a databus issue
5. Up till now we have received 7000+ (!) frames from amateurs using RASCAL
around the globe, amazing, thank you all so much!!
6. We have verified command uplink functionality yesterday, and were able to
command the spacecraft today on the low elevation (4.9max) pass over our GS
at 0737UTC
7. The spacecraft has decided to consistently use the backup radio on
145.930MHz for its telemetry downlink, we were able to request a full
on-board database dump while in range of our groundstation yesterday and
analysis of the database confirms this. We currently have a good
understanding why this is the case. We will try to switch downlinks to the
primary radio on 145.870MHz during the next good pass over our GS, so
amateurs in Western Europe might want to check that frequency also and might
experience intermittent telemetry while we are commanding. Note that we
suspect that the TX frequency could be 1 to 2 kHz lower on this radio, so
tuning around slowly is the best strategy.
8. The spacecraft seems to have an issue with the downlink TX switching off
into the orbit, which is the reason while Delfi-C3 has not been heard on
most descending passes over VK/ZL, we think we have a good understanding of
why it is. The TX itself is fine, but it switches off automatically when it
does not get data from the OBC for a certain amount of time. We are working
on resolving this issue. This also happened during the pass over our GS at
0737 UTC but we were able to command it back on. For those in Western Europe
we would like to ask to keep tracking Delfi-C3 even if you can not hear it
at first, as we will try to turn the TX back on as soon as we notice that it
has been turned off.
9. Thank you all for your observations on the spin rate, these are really
helpful! We currently think that the spacecraft is tumbling with approx
10deg/second, which corresponds to a 36 second period. Since the s/c
downlink antenna is almost truely circular, polarization sense can change
from RHCP to LHCP completely depending on s/c orientation, we use circular
antennas on our GS as well, and when we switch to the opposite polarizaiton
sense the signal is wiped out completely, switching back gives solid copy
with strong sigs.
10. NORAD object E #32787 seems to match best
thanks for all your observations and efforts so far!
73 on behalf of the Delfi-C3 team,
Wouter Jan Ubbels
------------------------------
Message: 15
Date: Wed, 30 Apr 2008 12:31:30 +0300
From: "Kostas Ioannidis" <kostas.ioannidis(AT)gmail.com>
Subject: [amsat-bb] C3 heard at KM17VX
To: AMSAT-BB(AT)amsat.org
Message-ID:
<6cd5903a0804300231k4ed73027vb4e8bedcca4f9656(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
C3 heard at 9:25 at km17vx transmitting at 145.930MHz. It was not
sending tlm .
73 de sw1ixp
------------------------------
Message: 16
Date: Wed, 30 Apr 2008 10:51:58 +0100
From: Robert Turlington <rob_g8ate(AT)hotmail.com>
Subject: [amsat-bb] Re: Delfi-C3 status update 30 April 2008 08:00 UTC
To: Wouter Jan Ubbels <wjubbels(AT)gmail.com>, Amsat Buleitin Board
<amsat-bb(AT)amsat.org>
Message-ID: <BAY112-W55C79EE1DDDB5961864397C0D80(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hi All
I heard Delfi-c3 for about a minute ,only ,at about 0916utc this morning on
145.930+/- doppler
last evening it also switched off halfway through its obit just after 2000utc
using a pointable 6el horiz quad and doppler tuned ft8476 in io92jp
Regards Robert G8ATE
> Date: Wed, 30 Apr 2008 10:16:58 +0200
> From: wjubbels(AT)gmail.com
> To: amsat-bb(AT)amsat.org
> CC: rascal(AT)delfic3.nl
> Subject: [amsat-bb] Delfi-C3 status update 30 April 2008 08:00 UTC
>
> Hi all,
>
> Delfi-C3 is in orbit and healthy, despite some minor issues, please find a
> status update below:
>
> 1. Telemetry indicates that all solar panels and antennas have deployed
> properly
>
> 2. Telemetry indicates nominal values for all housekeeping values
>
> 3. We have already obtained payload data, and have been able to generate IV
> curves of the Thin Film Solar Cell experiment, note that those uring
> RASCAL can view the IV curves by clicking Options-->show IV curves in
> RASCAL.
>
> 4. The spacecraft is operating in science mode, we have had one orbit in
> emergency mode, which was most probably due to a databus issue
>
> 5. Up till now we have received 7000+ (!) frames from amateurs using RASCAL
> around the globe, amazing, thank you all so much!!
>
> 6. We have verified command uplink functionality yesterday, and were able to
> command the spacecraft today on the low elevation (4.9max) pass over our GS
> at 0737UTC
>
> 7. The spacecraft has decided to consistently use the backup radio on
> 145.930MHz for its telemetry downlink, we were able to request a full
> on-board database dump while in range of our groundstation yesterday and
> analysis of the database confirms this. We currently have a good
> understanding why this is the case. We will try to switch downlinks to the
> primary radio on 145.870MHz during the next good pass over our GS, so
> amateurs in Western Europe might want to check that frequency also and might
> experience intermittent telemetry while we are commanding. Note that we
> suspect that the TX frequency could be 1 to 2 kHz lower on this radio, so
> tuning around slowly is the best strategy.
>
> 8. The spacecraft seems to have an issue with the downlink TX switching off
> into the orbit, which is the reason while Delfi-C3 has not been heard on
> most descending passes over VK/ZL, we think we have a good understanding of
> why it is. The TX itself is fine, but it switches off automatically when it
> does not get data from the OBC for a certain amount of time. We are working
> on resolving this issue. This also happened during the pass over our GS at
> 0737 UTC but we were able to command it back on. For those in Western Europe
> we would like to ask to keep tracking Delfi-C3 even if you can not hear it
> at first, as we will try to turn the TX back on as soon as we notice that it
> has been turned off.
>
> 9. Thank you all for your observations on the spin rate, these are really
> helpful! We currently think that the spacecraft is tumbling with approx
> 10deg/second, which corresponds to a 36 second period. Since the s/c
> downlink antenna is almost truely circular, polarization sense can change
> from RHCP to LHCP completely depending on s/c orientation, we use circular
> antennas on our GS as well, and when we switch to the opposite polarizaiton
> sense the signal is wiped out completely, switching back gives solid copy
> with strong sigs.
>
> 10. NORAD object E #32787 seems to match best
>
>
> thanks for all your observations and efforts so far!
>
> 73 on behalf of the Delfi-C3 team,
>
> Wouter Jan Ubbels
> _______________________________________________
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End of AMSAT-BB Digest, Vol 3, Issue 211
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