[amsat-bb] Re: European Lunar Lander - Call for Declarations

[i8cvs]

Hi Stefan VE4NSA, Peter DB2OS and folks on BB

It should be very nice to have a transponder on the Lunar Lander operating into the X/K band 10,5 GHz Uplink and 24 GHz downlink. As on AO40 the antennas are very small and probably there is room for a transponder.

For a good feasibility and assesment with ESA it would be very important to have also a 24 GHz Beacon relaying to us TLM data concerning some primary ESA experiments.  

Just my idea.

73" de 

i8CVS Domenico
  ----- Original Message ----- 
  From: Stefan Wagener 
  To: i8cvs 
  Cc: Peter Guelzow ; Amsat - BBs 
  Sent: Monday, June 04, 2012 9:26 AM
  Subject: Re: [amsat-bb] Re: European Lunar Lander - Call for Declarations


  Thanks folks, 


  That's a very helpful and constructive discussion. It will certainly allow for better assessment of the feasibility, options and limitations.


  Stefan, VE4NSA


  On Sat, Jun 2, 2012 at 8:54 PM, i8cvs <domenico.i8cvs at tin.it> wrote:

    Hi Peter, DB2OS

    I was reading the document in particular point 2.2.2
    Communication and 2.2.3 but in my opinion the Radio
    Hams are off side because everyting has been already
    designed and in my opinion there is no room available
    on the Lander for a Moon-Earth experimental communication
    transponder in our L band and S band because our antennas
    are too big.

    Since the main 7.2 and 8.5 GHz X band High Gain Antennas
    of the Lander are oriented toward the Earth in a fixed position
    to compensate the pointing for libration probably only a 5 watt
    pep and a circularly polarized horn on our 10.5 GHz should be
    possible.

    73" de

    i8CVS Domenico


    ----- Original Message -----
    From: "Peter Guelzow" <peter.guelzow at kourou.de>
    To: <amsat-bb at amsat.org>
    Sent: Sunday, June 03, 2012 12:57 AM
    Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations


    Hi together,

    Please also have a look at this document:

    http://wsn.spaceflight.esa.int/docs/lunarlander/LunarLander_EIDA_CDI_230512.
    pdf

    in particular see point 2.2.2 Communication and 2.2.3:

    "Visibility of the Earth from the landing site imposes the following
    constraint:
    • communications shall only be possible within a 13.7 day (TBC) window
    each month, and shall depend on the availability of the ground station."

    further:

    "the mean power available for an individual payload is expected not to
    exceed 20W"

    73s Peter DB2OS

    On 03.06.2012 00:29, Peter Guelzow wrote:

    > Check also this discussion from James Miller, G3RUH:
    >
    >                   http://www.amsat.org/amsat/articles/g3ruh/110.html
    >
    >
    > 73s Peter, DB2OS

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