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

[i8cvs]

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