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

[Jari Koivurinne]

> 
> I disagree about having to have a EME class station if we put a
> transponder on the moon.
> The reason being, since the same side is always facing the earth, a
> directional high gain antenna may be used on the transponder itself!
> 
> Lee
> W5LMM

How big antenna and what band should be used? Please calculate the best
combination here:

http://www.changpuak.ch/electronics/calc_10.php

Note that you need about -120dBm signal to be heard in receiver.
The path is about 400000km (240000 miles).

-jari oh3uw  ;-)