April 2008 - AMSAT-BB - mailman.amsat.org

Delfi-C3 RASCAL tuning & TLE's
by Wouter Jan Ubbels 30 Apr '08

30 Apr '08

Hi all, we have added a section to our RASCAL tuning guide in order to make achieving sync in RASCAL easier, see http://www.delfic3.nl/index.php?option=com_content&task=view&id=94&Itemid=1… I have also included it in this mail for clarity: Tuning can sometimes be difficult, in the presence of Doppler shift, fading due to polarization changes, frequency offset due to temperature of the spacecraft oscillators and there is the possibility that the Costas Loop indicates a false sync because of lock on one of the signal's sidebands. If possible, you can use a waterfall display in software like MixW running parallel to RASCAL which will give you an indication of the centerfrequency. During transmission of AX.25 flags, the actual carrier frequency is the highest peak in the spectrum, with a couple of sidebands exactly 150Hz apart, looks like a comb. Now, using the waterfall display, tune such that this highest peak corresponds to 1600Hz +/-100Hz, in order to achieve sync. Furthermore, Delfi-C3 is now listed on celestrack with identifier DELFI-C3 , as object #32787, these TLE's are also on our mission ops page. Today we also verified that our backup command receiver functions well, we are still working on the TX drop out issue. 73 on behalf of the Delfi-C3 team, Wouter Jan Ubbels PE4WJ

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Satellite Frequency Control
by David Barber 30 Apr '08

30 Apr '08

Perhaps this is a really stupid question? The deviation from the intended frequency of operation of a satellite is often mentioned here therefore would it not be possible to lock the frequency of the payload to a GPS derived source? I appreciate this may not be practical on Cubesats but for longer life products? Comments...

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DELFI C 3
by Luc Leblanc 30 Apr '08

30 Apr '08

Nothing heard on the 1405Z south bound pass on 145.930 Mhz "-" Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE

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Cute-1.7+APDII over West Malaysia
by Sion Chow Q. C. (9W2QC) 30 Apr '08

30 Apr '08

Dear All, Here is an MP3 recording of Cute-1.7+APDII over West Malaysia. Satellite was tracked using Object - J and maximum elevation was 10 degree. Time was 2132 Local or 1332 UTC. http://www.9w2qc.net/amsatbb/cute30apr0932.mp3 The MP3 recording is unedited as I am copying this remotely via VNC/Teamspeak. I think I heard another satellite transmitting towards the end of the pass on top of Cute-1.7 + APDII. 73, Sion Chow Q. C., 9W2QC.

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Re: Delfi-C3 status update 30 April 2008 08:00 UTC
by Robert Turlington 30 Apr '08

30 Apr '08

Hi All a good pass of delfi at 1150 utc got 50 packets decoded the beacon was switching on and off every 60secs or so starting at 1155-30 secs approx finally switched off at1200-20secs or there aboutsRegards Robert G8ATE > Date: Wed, 30 Apr 2008 10:16:58 +0200> From: wjubbels(a)gmail.com> To: amsat-bb(a)amsat.org> CC: rascal(a)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> _______________________________________________> Sent via AMSAT-BB(a)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 _________________________________________________________________ Search and win with BigSnapSearch.com http://www.bigsnapsearch.com

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Cute1 telemetry
by Alan Cresswell 30 Apr '08

30 Apr '08

Hiroki, I copied some CW from Cute 1 but it was not obvious where to send it so I will post it here. 1006UT CUTE 87 CB A7 69 3C 2D 29 AC 4F 26 17 1008UT CUTE 87 CA A7 69 3C 2D 29 AC ?C 29 17 1012UT (Fade) 8 CB A5 69 3C 2C 2A AC 51 2E 17 1014UT CUTE 86 C6 A5 68 3C 2C 29 A.. (LOS) Hope that helps Alan ZL2BX

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Re: Delfi-C3 status update 30 April 2008 08:00 UTC
by Robert Turlington 30 Apr '08

30 Apr '08

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(a)gmail.com > To: amsat-bb(a)amsat.org > CC: rascal(a)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 > _______________________________________________ > Sent via AMSAT-BB(a)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 _________________________________________________________________ Bag extra points with the Walkers Brit Trip Game http://www.walkersbrittrips.co.uk/game

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C3 heard at KM17VX
by Kostas Ioannidis 30 Apr '08

30 Apr '08

C3 heard at 9:25 at km17vx transmitting at 145.930MHz. It was not sending tlm . 73 de sw1ixp

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C3 heard at KM17VX
by Kostas Ioannidis 30 Apr '08

30 Apr '08

C3 heard over km17vx.Packets recieved and uploaded ok.At 7:50 utc transmission at 145.930 stopped. 73 de sw1ixp

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Jules Verne boosts ISS orbit
by uschndr＠zedat.fu-berlin.de 30 Apr '08

30 Apr '08

>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.

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Delphi c3
by Alan Cresswell 30 Apr '08

30 Apr '08

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

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Two CubeSats TLE decided
by Mineo Wakita 30 Apr '08

30 Apr '08

In Space-Track: 32783 OBJECT A = CARTSAT 2A 32792 OBJECT K = RUBIN 8/PSLV

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Delphi C3
by Alan Cresswell 30 Apr '08

30 Apr '08

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

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SEEDS and Delfi-C3 over West Malaysia
by Sion Chow Q. C. (9W2QC) 30 Apr '08

30 Apr '08

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.

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Emergency in Cute-1.7
by Hiroki Ashida 30 Apr '08

30 Apr '08

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(a)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

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ao27.org possible schedule error?
by Sam KC2LRC 30 Apr '08

30 Apr '08

When setting up to work AO-27 yesterday I noticed that the schedule on ao27.org indicated it would be turning on later than normal, with the bird up in Canada. I went out to catch the pass a minute before the scheduled on time and found that the bird was already on. It switched to TLM within a minute and then turned off. Today I went out for the 2022 pass before my tracking program's indicated AOS. The bird was on as it rose and it stayed on for a good 6-7 mins before going to TLM. When I got back in after it turned off, ao27.org listed analog as the current mode, with over 5 minutes remaining. From what I see, the schedule on ao27.org seems to be 8-10 mins off from actual time. The bird doesn't seem to have changed schedule at all. Can anyone else confirm this? 73, Sam KC2LRC Syracuse, NY - FN13

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Seed Over CHILE Audio
by Raul Romero CA3SOC 30 Apr '08

30 Apr '08

----- Original Message ----- From: Raul Romero CA3SOC To: Amsat-Bb(a)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 --------------------------------------------------------------------- "Are you still wasting your time with spam?... There is a solution!" Protected by GIANT Company's Spam Inspector The most powerful anti-spam software available. http://mail.spaminspector.com

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Delfi-C3 not copy over PY land
by Fabio Teixeira Magalhaes 30 Apr '08

30 Apr '08

Hello >From 00:35 to 00:47 04/30/2008 - nothing heard from Delfi-3C over GH70un. 73 es DX Fabio - PY4AJ Amsat 19.748

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Seed Over CHILE Audio
by Raul Romero CA3SOC 30 Apr '08

30 Apr '08

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 --------------------------------------------------------------------- "Are you still wasting your time with spam?... There is a solution!" Protected by GIANT Company's Spam Inspector The most powerful anti-spam software available. http://mail.spaminspector.com

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Delfi-c3 heard, packets printed!
by Mark L. Hammond 30 Apr '08

30 Apr '08

Finally got some packets tonight. 30April2008 0225 UTC from FM05pj, 145.930 MHz, LOUD when it came into the sunlight (S7). RASCAL recorded just shy of 100 packets. RASCAL is a neat piece of software! I also copied packets via the DSP-93/TNC in KISS mode. 73, Mark L. Hammond [N8MH]

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Delfi-C3 over West Malaysia
by Sion Chow Q. C. (9W2QC) 30 Apr '08

30 Apr '08

Dear All, Finally managed to copy Delfi-C3 during a 9 degree elevation pass this morning, 0922 local or 0122 UTC over West Malaysia. Unfortunately, I failed to log into the Delfi server for some reasons - have to check my login again. Also briefly heard SEEDS again on this pass, while Cute-1.7 + APDII was not heard. Is Cute-1.7+APDII continuously transmitting CW telemetry on 437.275 MHz? Captured telemetry are as below. A screenshot of RASCAL is available at http://www.9w2qc.net/amsatbb/delfi30apr0922.jpg from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 af 06 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 b0 06 96 84 eb ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 3f fb fb 57 77 00 01 01 09 00 00 00 00 3c 00 a0 83 4c 00 a8 0b 80 09 00 58 0d 40 5f 00 28 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 b3 06 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 b6 06 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 bb 06 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 bc 06 96 84 eb ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 3f fb fa 57 63 08 00 01 08 00 00 00 00 3d 00 a0 43 4c 00 a0 0b 80 12 00 84 0d c0 6d 00 78 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 bf 06 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 from: DLFIC3 to: TLM a8 98 9b 40 40 40 00 88 98 8c 92 86 66 01 03 f0 63 06 c0 06 96 84 eb ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 3f fa fa 58 6a 22 07 00 08 00 00 00 00 3d 00 a0 03 4c 00 38 09 40 12 00 6c 0d c0 63 00 60 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Tuning the downlink for Doppler is indeed not a simple process but luckily still manageable. Have another pass at 1055 local or 0255 UTC where I will attempt to copy again. Both SEEDS and Delfi-C3 were copied using Object C keps. Equipment used, IC-910H, 2x10 Yagi for VHF, 2x15 Yagi for UHF, SB-2000 VHF Preamp and SB-7000 UHF Preamp. All horizontally polarized. WAV or MP3 recording of Delfi-C3 also available on request. 73, Sion Chow Q. C., 9W2QC.

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Delfi-C3
by Alan Cresswell 30 Apr '08

30 Apr '08

It seems that most reports of good Delfi reception relate to northbound passes. So far it appears that Delfi has not been heard in VK/ZL during a number of Southbound sunlit passes despite a number of stations listening and good reception of SEEDS and Cute1.7. Could this be a spacecraft orientation issue or has Delfi just a bit anti Southern hemisphere? Alan ZL2BX

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Delfi still not heard over VK
by David 30 Apr '08

30 Apr '08

Hello All, 23:50 2008/04/29 UTC pass - nothing heard from Delfi-3C over VK. Admittedly I was concentrating on SEEDS, which I did hear very well. Yesterday I checked my setup was working by listening to VO-52's beacon and all is ok. Isn't this fun. 73 de David VK5DG

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DelfiC3 Spin Rate
by Rob Hardenberg PE1ITR 29 Apr '08

29 Apr '08

Hi All, Good DelfiC3 pass here on 2008-04-29 18:20~18:30UTC. Decoded 223 packets with the Rascal software. This time I used automatic doppler correction and tracked object D. I have the impression that DelfiC3 is earlier than object B. As experiment I tried to determine the spinrate of delfic3 and counted the dips in the signal level. Its 12 dips in 1 minute period so the spinrate at the moment must be 12 rpm or some related number (24,6,3.. rpm). See screenshot: http://www.pe1itr.com/satellite/delfic3_pe1itr_29apr2008.jpg 73 Rob PE1ITR http://www.pe1itr.com

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413 packets received from DelfiC3 (TLE +RASCAL screenshot).
by Cor 29 Apr '08

29 Apr '08

Hello All, In the 21:34UTC pass I received 413 packets. Sadly keps are not accurate so I had to search for the strongest signal (I lost sync somethimes). A screenshot of RASCAL software can be seen here: http://pd0rkc.ontwikkel.nl/DELFIC3/29April2008DelfiC3_TLE_orbit26.jpg DelfiC3 telemetry orbit 26: http://pd0rkc.ontwikkel.nl/DELFIC3/29April2008DelfiC3_TLE_orbit26.txt 73's Cor PD0RKC Ham Radio In Space: http://iss.ontwikkel.nl

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