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Dust Storm
marsophile
post Yesterday, 05:55 AM
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The DSN Now display shows 4 antennas at each complex. However, there may actually be more than 4. For example, Goldstone seems to have 8.
https://en.wikipedia.org/wiki/Goldstone_Dee...omplex#Antennas

Are the antennas that are not displayed idle, or are they doing stuff that we can't see, such as attempts to transmit commands to Opportunity? This might explain why we don't see the every-day attempts discussed in the most recent MER press release.
QUOTE
With more sunlight reaching the rover's solar array, the Opportunity team at NASA's Jet Propulsion Laboratory in Pasadena, California, are increasing the frequency of commands it beams to the 14-plus-year-old rover via the dishes of NASA's Deep Space Network from three times a week to multiple times per day.

[EDIT] Uplink to MER1 from Goldstone now (12:30am). Maybe the action just happens while I'm asleep...
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djellison
post Yesterday, 03:18 PM
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QUOTE (marsophile @ Sep 16 2018, 10:55 PM) *
Are the antennas that are not displayed idle


They are no longer used for routine DSN operations.
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xflare
post Today, 07:53 AM
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QUOTE (mcaplinger @ Sep 15 2018, 08:19 PM) *
There's a good chance that the first signals will only be seen in radio science recordings, which won't show up in the realtime DSN status anyway.


arggh you're right, was just watching the DSN status page and their twitter page, and another false alarm, this time with Maven. laugh.gif

edit: Here is the History of MAVEN from the DSN status twitter feed https://twitter.com/search?f=tweets&q=M...us&src=typd

And Opportunity's last DSN comm from June 10th? https://twitter.com/dsn_status/status/1005823559166459908
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akuo
post Today, 08:02 AM
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Well, that momentary carrier lock at 8.4351GHz was a lot closer to the expected Oppy frequency (8.4358GHz you pointed before), than Maven's 8.4454GHz... But yeah, maybe it's the doppler shift around the orbit.


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Antti Kuosmanen
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djellison
post Today, 03:20 PM
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-148dBm is FAR too strong for a MER LGA on the surface. That last DSN Now entry was a high gain antenna. Not the low gain that will be used now. Expect something more like -160 dBm.


Honestly - given the idiosyncrasies of how the DSN works - it is unlikely you're gonna be able to identify a successful vehicle recovery via DSN Now.
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