[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: NASA's American Student Moon Orbiter...



Drew-

Your math is feasible (e.g. too lazy to check it), but with advances
in digital comms and personal computing, forward error correcting
schemes can result in a huge "digital gain" of 6, 12 even 20+ dB
towards the link budgets.

That is of course if you don't want to do SSB voice...  ;-)

73,

Dave
AF6KD (ex n0tgd)

On Wed, Jul 2, 2008 at 5:28 PM, Andrew Glasbrenner
<glasbrenner@mindspring.com> wrote:
> The moon is roughly 360,000 to 400,000 km away. By comparison, AO-40 had a
> apogee of about 60,000km. At 2.4Ghz, that's about 16db difference each way.
> Put AO-40 at the moon, and if I'm doing this right, you'd need about 32
> times the ground station antenna both coming and going to get with a few db.
> I'm gonna need a bigger rotor for sure! I'm sure smarter folks will check my
> math....
>
> 73, Drew KO4MA
>
> ----- Original Message -----
> From: "Joe" <nss@mwt.net>
> To: "Andrew Glasbrenner" <glasbrenner@mindspring.com>
> Cc: "Trevor" <m5aka@yahoo.co.uk>; "AMSAT BB" <amsat-bb@amsat.org>
> Sent: Wednesday, July 02, 2008 6:05 PM
> Subject: Re: [amsat-bb] Re: NASA's American Student Moon Orbiter...
>
>
>> what would a sample average link budget be?
>>
>> Andrew Glasbrenner wrote:
>>
>>>As far as I can recall we are pursuing both Eagle and the P4 opportunity
>>>equally, concentrating on common elements until the details are ironed
>>>out. Neither has been identified as a primary or secondary objective.
>>>
>>>I agree a package on a lunar orbiter would be neat, but also that it is
>>>not the best use of what volunteers we have. We need more folks to step up
>>>to do things, AND we need to make better use of them when they do.
>>>
>>>73, Drew KO4MA
>>>
>>>----- Original Message -----
>>>From: "Trevor" <m5aka@yahoo.co.uk>
>>>To: "AMSAT BB" <amsat-bb@amsat.org>
>>>Sent: Wednesday, July 02, 2008 4:53 PM
>>>Subject: [amsat-bb] Re: NASA's American Student Moon Orbiter...
>>>
>>>
>>>
>>>>--- On Wed, 2/7/08, Dave hartzell <hartzell@gmail.com> wrote:
>>>>
>>>>>http://www.spaceref.com/news/viewpr.html?pid=25839
>>>>>http://asmo.arc.nasa.gov/
>>>>>
>>>>>Wouldn't it be fun to have a transponder on this!  ;-)
>>>>>
>>>>Fun yes, but dare I say it, a waste of precious Volunteer resources.
>>>>
>>>>All lunar orbits are inherently unstable and will impact after a couple
>>>>of years. The link budget requirements would not attract a mass user
>>>>base.
>>>>
>>>>I suspect the number of Technically Capable volunteers is already being
>>>>thinly stretched in trying to provide both the primary objective Phase-IV
>>>>Lite (funded by Federal Government dollars) and the secondary objective
>>>>the Eagle HEO.
>>>>
>>>>73 Trevor M5AKA
>>>>
>>>>
>>>>
>>>>     __________________________________________________________
>>>>Not happy with your email address?.
>>>>Get the one you really want - millions of new email addresses available
>>>>now at Yahoo! http://uk.docs.yahoo.com/ymail/new.html
>>>>
>>>>_______________________________________________
>>>>Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
>>>>Not an AMSAT-NA member? Join now to support the amateur satellite
>>>>program!
>>>>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>>
>>>_______________________________________________
>>>Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
>>>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>>>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>>
>>>
>>>
>>>
>
> _______________________________________________
> Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb



AMSAT Top AMSAT Home