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#160 by sts1canada on 14 Jun, 2007 19:42
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I think this day pass which lasts from now to 4:25 PM EDT will probably be the last day pass today to retract the P6 2B array, according the time line for today, FD 7. I think we will see the EVA crew tomorrow finish the retract process during EVA 3 after the OMS pod blanket repair, I just think that this array needs the help of EVA assistance. Now 45 minutes to sunset, 22 minutes to TDRS-EAST handover (not sure about good KU after that handover), and 52 minutes to the ZOE again (next ZOE is about 12 minutes long).
Richard
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#161 by Avron on 14 Jun, 2007 19:45
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Wiggles in work
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#162 by Zachstar on 14 Jun, 2007 19:46
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More wiggles.
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#163 by sts1canada on 14 Jun, 2007 19:51
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36 minutes to sunset, 13 minutes to TDRS-East handover (unsure of KU coverage after this) and 43 minutes to the ZOE. If the crew & MCC-H cancel the array retract for the day, I will end my updates and rejoin you all for the EVA 3 tomorrow.
Richard
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#164 by jaredgalen on 14 Jun, 2007 19:51
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While I understand that ensuring no damage is done to the arrays is paramount, are they being too cautious in the retraction? The first retraction that was done with Beamer, the arrays were put through far more failed retractions and extensions without any major drawbacks it seems...
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#165 by Zachstar on 14 Jun, 2007 19:54
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jaredgalen - 14/6/2007 2:51 PM
While I understand that ensuring no damage is done to the arrays is paramount, are they being too cautious in the retraction? The first retraction that was done with Beamer, the arrays were put through far more failed retractions and extensions without any major drawbacks it seems...
Well remember that they have to extend these again on 120.
But they may be acting a tad too cautious. -
#166 by charlieb on 14 Jun, 2007 19:55
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Hey Richard,
The 'Ratty Comm' that you are referring to is via the S-Band - not the Ku - and from my experiences in the past, the ratty-ness was from TDRS being 'off-the-nose, or 'off-the-tail'. We used to lock up the KU with TDRS during handovers, or post-ZOE acquisitions without much problem either.. S-Band would also get a phase-error problem usually during end-of-TDRS passes due to high-doppler effect buildups that would occur during the TDRS passes, and with that we'd have to drop modulation, and re-acquire (the S-band Rx's would have to re-sweep).
If you do not understand what I mean by 'off-the-nose, or 'off-the-tail', I will get back to you on that topic..
Charlie -
#167 by Zachstar on 14 Jun, 2007 19:55
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Crew feels better about letting EVA do repair work while retracting.
Standing down from arrays. -
#168 by fburnell on 14 Jun, 2007 19:56
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There is still much to be determined about any damage that may have occurred during the first retraction. They still have to redeploy and reactivate that array. Better to be cautious.
Oops - Zachstar beat me to the point :laugh: -
#169 by sts1canada on 14 Jun, 2007 19:56
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Waiting for MCC-H and the crew's call on one more attempt to retract the array for the day, decision is to stop the array retract for the day, so we will go at it again with the EVA 3 crew tomorrow. That's all for me today, see you all tomorrow for the EVA.
Richard -
#170 by sts1canada on 14 Jun, 2007 19:59
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charlieb - 14/6/2007 3:55 PM
Hey Richard,
The 'Ratty Comm' that you are referring to is via the S-Band - not the Ku - and from my experiences in the past, the ratty-ness was from TDRS being 'off-the-nose, or 'off-the-tail'. We used to lock up the KU with TDRS during handovers, or post-ZOE acquisitions without much problem either.. S-Band would also get a phase-error problem usually during end-of-TDRS passes due to high-doppler effect buildups that would occur during the TDRS passes, and with that we'd have to drop modulation, and re-acquire (the S-band Rx's would have to re-sweep).
If you do not understand what I mean by 'off-the-nose, or 'off-the-tail', I will get back to you on that topic..
Charlie
Thanks Charlie, I understand what you mean, I didn't know that S-Band is the source of the ratty comm, I always thought it was the KU trying to locate and lock on the TDRS making that sound, thanks!
Richard
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#171 by jaredgalen on 14 Jun, 2007 20:06
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fburnell - 14/6/2007 8:56 PM
There is still much to be determined about any damage that may have occurred during the first retraction. They still have to redeploy and reactivate that array. Better to be cautious.
Point taken of course, my understanding would be that the guide wires and grommets are much less important when extending the arrays though. But better safe then sorry I suppose. -
#172 by Chris Bergin on 14 Jun, 2007 20:24
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CMGs working fine at the moment as they continue to provide attitude to the ISS.
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#173 by Speedracer on 14 Jun, 2007 20:26
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Haven't been able to keep up...are they going to shake, rattle, and roll the array some more?
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#174 by Chris Bergin on 14 Jun, 2007 20:28
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Speedracer - 14/6/2007 9:26 PM
Haven't been able to keep up...are they going to shake, rattle, and roll the array some more?
Looking for a final bay count and leaving it for today.
15 or 15.5 bays to go (they say) -
#175 by DaveS on 14 Jun, 2007 20:30
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Speedracer - 14/6/2007 10:26 PM
No shakings or rattling. Just moving them up and down in the so called "Beta Gimbal Assembly(BGA) wiggle". They have stood down from any retracts until tommorow as a bunch of grommets on the guide wires are folding the wrong way and preventing the blanket panels from retracting properly.
Haven't been able to keep up...are they going to shake, rattle, and roll the array some more? -
#176 by Jorge on 14 Jun, 2007 20:43
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Blade_Pride - 14/6/2007 1:26 PM
Why does the NASA page say that with the building of the Guam Remote Ground Terminal ZOE had been eliminated, when it has not? It also says TDRSS provides customers with 100% coverage. Did somthing not work out the way they wanted to?
TDRS Z (relayed through Guam) did eliminate the ZOE, but NASA does not schedule it for every pass - only for complex mission phases.
And of course, 100% TDRS coverage does not mean 100% comm, since structural blockage is still a factor. -
#177 by JimO on 14 Jun, 2007 20:56
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My MSNBC analysis is up. I hope it doesn't sound too alarmist, but if it does, suck it up.
Space station glitch puzzles the experts
Computer system plays crucial role in stabilizing orbital outpost
http://www.msnbc.msn.com/id/19228925/
By James Oberg, NBC News space analyst // Special to MSNBC // Updated: June 14/ 2 PM CDT
HOUSTON - The failure of all six main control computers on the international space station's Russian segment has baffled space engineers in Houston and in Moscow. Temporary repairs aren’t enough. If the cause of the sudden simultaneous failures cannot be quickly identified and remedied, the space station's future operations are under threat. -
#178 by JimO on 14 Jun, 2007 20:57
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There was supposed to be an emoticon after the 'suck it up' phrase!! Oops! :frown:
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#179 by rdale on 14 Jun, 2007 21:05
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JimO - 14/6/2007 4:56 PM
If the cause of the sudden simultaneous failures cannot be quickly identified and remedied, the space station's future operations are under threat.
That's not what I heard at today's press conference... Do you have inside info you can share?
