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Author Topic: Communicating with the Mars Robot ???  (Read 439 times)
WA4ONV
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Posts: 51




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« on: June 01, 2008, 06:29:29 AM »

Hi Folks,

Was just wondering what frequencies and type of antennas are used by NASA to communicate with the new Robot that just landed on Mars ?? Wow, talking about DX...lol

Also wondering if any type of repeater are used along the way to facilitate the communications.  Thanks in advance for all the answers.

Best of 73 to all.

Joe...WA4ONV  
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KZ1X
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Posts: 3227




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« Reply #1 on: June 01, 2008, 06:48:00 AM »

So far as I know, both X band and Ka bands are used.  The two repeaters used are orbiting Mars, and then the Earth stations are the NASA DSN facilities, located in various places around the world.
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TANAKASAN
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Posts: 933




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« Reply #2 on: June 01, 2008, 07:37:58 AM »

NASA use the antennas of the Deep Space Network which were (I think) originally constructed to hear signals from the Voyager probes in the 1970's. There are three antennas each about 120 degrees apart to ensure continuous coverage, these are sited in Spain (Madrid), Australia (Canberra) and the USA Goldstone. Here's some pictures:

http://deepspace.jpl.nasa.gov/dsn/gallery/images/goldstone7.jpg (Goldstone)

http://www.jpl.nasa.gov/files/images/browse/pcd1823_14.gif (Madrid)

http://upload.wikimedia.org/wikipedia/commons/3/3e/Dsn_canberra.jpg (Canberra)

Tanakasan

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KB4QAA
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Posts: 2264




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« Reply #3 on: June 01, 2008, 03:16:09 PM »

The two Mars orbiters act as the go-betweens, and also store and forward data earthward.  I saw a mention earlier this week, when they lost communications briefly that the link between the orbiters and the lander is UHF.

Bill
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WA9SVD
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Posts: 2201




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« Reply #4 on: June 01, 2008, 03:36:59 PM »

Was just wondering what frequencies and type of antennas are used by NASA to communicate with the new Robot that just landed on Mars ?? Wow, talking about DX...lol


Aww, geez.  Doesn't everybody have a 70 Meter dish in their backyard?
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K9COX
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Posts: 53




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« Reply #5 on: June 01, 2008, 05:29:12 PM »

http://www.rfspace.com/Blog/Blog.html
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DROLLTROLL
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Posts: 265




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« Reply #6 on: June 02, 2008, 06:46:30 AM »

27.185 mHz is the frequency of choice, with co-phased whips on the rover and stacked Moonrakers on the terrestrial side:-)
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WA3SKN
Member

Posts: 5436




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« Reply #7 on: June 02, 2008, 09:17:20 AM »

Well, Joe... NASA's secret for deep space is to use microwave frequencies and those 210 foot dishes at Madrid, Goldstone, and Canberra... along with liquid helium cooled LNAs in the front end.  They then send the data to JPL via satellite links.
What's REALLY impressive is the concrete pads for those antennas!  Talk about wind-loading!
73s.

-Mike.
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KE4DRN
Member

Posts: 3714




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« Reply #8 on: June 02, 2008, 06:08:57 PM »

hi,

our HOA won't let me have a big enough
dish on my roof to receive the
video from the rovers and landers.

wonder what language they are using
to control the lander ?

73 james
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