[amsat-bb] Fw: Fw: AMSAT-DL Hears Mars Science Laboratory X-Band Downlink
domenico.i8cvs at tin.it
Sun Nov 27 18:22:05 PST 2011
----- Original Message -----
From: "James R Miller" <g3ruh at jrmiller.demon.co.uk>
To: <domenico.i8cvs at tin.it>
Cc: <peter.guelzow at kourou.de>
Sent: Monday, November 28, 2011 1:57 AM
Subject: Re: Fw: [amsat-bb] AMSAT-DL Hears Mars Science Laboratory X-Band
> Dear Domenico,
> > I was really impressed reading your report about receiving the
> > MSL beacon of MSL on the following page:
> Thank you!
> It is not difficult; we receive lots of the NASA spacecraft all the time.
> Stereo-A/B every day, and when they have gone LOS, we (I) check Grail-A
> and Grail-B and also Juno. When Juno was new, the signal was huge, and
> enabled the beam shape to be determined with greater depth than before.
> Grail-A/B have very high performance Ultra Stable Oscillators (USO) and
> they are free running. A daily check allows us to check independently
> that our own station oscillators remain in accurately lock.
> Reception of MSL required adding its trajectory data to the spacecraft
> database, and the frequency to the radio control computer. Provided the
> given frequency is with +/- 40 kHz of the actual frequency, we can lock
> onto it in 1 sec via an FFT acquisition process. As it happens, the
> actual frequency was within 8 kHz of the DSN channel centre, so finding it
> was immediate.
> The station computers can be remotely accessed from home to do software
> maintenance jobs. Hardware requires people to go to the site, of course.
> Remote software management is probably the most important part of this
> Article about telescope systems:
> Article about Stereo A/B reception:
> Hoping you are in good health. Wish I was in Italy for the winter!
> 73 de James G3RUH
> James R Miller WWW/PGP: http://www.jrmiller.demon.co.uk/
> Cambridge, England Stardate: 2011 Nov 28 [Mon] 0053 utc
HI Peter, DB2OS and James, G3RUH
I was really impressed reading your report about receiving the
MSL beacon of MSL on the following page:
Congrats to you Peter and James , I am sure that in the future
AMSAT-DL will be able to launch P3-E and P5-A
Thanks also to JoAnne K9JKM for providing us with the above
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