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#400
by
Prober
on 23 Nov, 2011 21:00
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Second communication slot has started five minutes ago.
(21:53–22:03 GMT)
ahhhh that makes this exciting as I can see her on the map near Auz in sunshine.
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#401
by
Skylab
on 23 Nov, 2011 21:02
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Also, wandering why only Perth can reach the spacecraft...
Only Perth has an 'upgraded' (adapted) antenna right now, in the area that sees daylight passes.
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#402
by
bolun
on 23 Nov, 2011 21:05
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Second communication slot is finished (21:53–22:03 GMT)
And now, we have to wait ...
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#403
by
lbiderman
on 23 Nov, 2011 21:06
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Also, wandering why only Perth can reach the spacecraft...
Only Perth has an 'upgraded' (adapted) antenna right now, in the area that sees daylight passes.
Alright, I get that, but what I was referring to is the aparent inability of Baikonur to communicate with the spacecraft. Mainly, if it is a power problem (batteries) or a station config issue
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#404
by
Prober
on 23 Nov, 2011 21:07
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Also, wandering why only Perth can reach the spacecraft...
Only Perth has an 'upgraded' (adapted) antenna right now, in the area that sees daylight passes.
You have any links to info on this.........Perth is now in the spotlight and sure Chris could use the info for his article.
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#405
by
Svetoslav
on 23 Nov, 2011 21:09
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I have difficulties to access Novosti-Kosmonavtiki. Reminds me of the first hours after launch of Phobos-Grunt... Too much traffic... If we lose Novosti-Kosmonavtiki for this evening, we lose the best news source.
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#406
by
Skylab
on 23 Nov, 2011 21:11
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You have any links to info on this.........Perth is now in the spotlight and sure Chris could use the info for his article.
No primary sources, but it was mentioned in the link to the RIA article. Of course you'll also have seen the mention of an extra 'horn' on the 15-m dish in Perth, through which a lower-strength signal was sent. This was to prevent overwhelming the receiver, which would be tuned to longer-distance communications.
Edit:
http://www.esa.int/esaCP/SEM4NEZW5VG_index_0.html - official source
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#407
by
hop
on 23 Nov, 2011 21:13
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Alright, I get that, but what I was referring to is the aparent inability of Baikonur to communicate with the spacecraft. Mainly, if it is a power problem (batteries) or a station config issue
I think this is unknown, but telemetry should help clear it up.
According to earlier reports, the Baikonur stations would have had difficulties tracking PG in the current orbit, so failing to make contact doesn't necessarily mean PG was incapable of communicating in those passes.
http://www.russianspaceweb.com/phobos_grunt_kik.html discusses some of this.
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#408
by
asdert
on 23 Nov, 2011 21:20
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Also, wandering why only Perth can reach the spacecraft...
Besides adapting the antenna, you maybe need some more RF equipment. Amplifiers of the right frequency range, duplexer, transmitter and receiver... And then there is modulation and coding. I don't know whether there are established standards in satellite communication, or whether each agency may transmit its own type of signal.
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#409
by
bolun
on 23 Nov, 2011 21:23
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#410
by
Skylab
on 23 Nov, 2011 21:24
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Besides adapting the antenna, you maybe need some more RF equipment. Amplifiers of the right frequency range, duplexer, transmitter and receiver... And then there is modulation and coding. I don't know whether there are established standards in satellite communication, or whether each agency may transmit its own type of signal.
The ITU has dedicated a portion of the X-band range to satellite communications only.
From reading loads over these past few days, I think Perth's higher slew rate also helped, but can't provide a link right now.
Edit: And Kourou is also an option, I've noticed. But Perth is almost all there is in the Southern hemisphere.
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#411
by
bolun
on 23 Nov, 2011 21:28
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#412
by
Michael J
on 23 Nov, 2011 21:31
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According to a tweet from Russian Space Web, normal power and radio operations have been confirmed.
I have to discount this one ......."normal power" that can't be right.
That's what he tweeted. He didn't provide a link.
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#413
by
pm1823
on 23 Nov, 2011 21:44
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According to a tweet from Russian Space Web, normal power and radio operations have been confirmed.
I have to discount this one ......."normal power" that can't be right.
That's what he tweeted. He didn't provide a link.
it's says only about of "normal power" for X-band radioset, when TM frame was received. Not about "normal power" status of all FG. Radio set have own "emergency TM frame".
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#414
by
PeterAlt
on 23 Nov, 2011 21:57
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Why has P-G missed its window and MSL's window is still open? Same neighborhood.
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#415
by
Lee Jay
on 23 Nov, 2011 21:59
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Why has P-G missed its window and MSL's window is still open? Same neighborhood.
Different trajectory.
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#416
by
Cbased
on 23 Nov, 2011 22:01
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TM = telemetry
TMI = trans Mars insertion [rocket burn]
Easy to confuse!!
To add to the confusion, the posters on NK forum appear to abbreviate telemetry "ТМИ" which google translate renders as "TMI"
"ТМИ" in Russian is "ТелеМетрическая Информация" i.e. TeleMetry Information (I deliberately made a capital "M" in both cases)
P.S. So happy! Thank you ESA, thank you Perth!
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#417
by
Prober
on 23 Nov, 2011 22:04
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Yes thank you Perth.....next fly by in about half hour or so.
Edit : aprox 23:17 in the sun.
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#418
by
PeterAlt
on 23 Nov, 2011 22:05
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Can they adjust P-G's tragectory to be more inline with MSL? Could they spend some of that extra fuel to get it back on course? Too bad it can't berth with MSL and hitch a ride!
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#419
by
e of pi
on 23 Nov, 2011 22:12
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Thank you, ESA and Perth! However...is there some reason this wasn't tried sooner? Was the orbit not right for contact from Perth, or is that Russia only finally asked?