Why moon natural satellite of earth is not used communication satellite?

Answer 1

The Moon is, sometimes, used as a natural reflector for radio signals. The problem is that the surface of the Moon is so rough and uneven that most of the signal scatters back into space instead of bouncing back to Earth.

Another reason is that the Moon can only reflect signals. Modern communications satellites actively rebroadcast the signal back to Earth.

And finally, the Moon is only available for half of the day, and it keeps moving. Modern satellites in geosynchronous orbit appear to hang motionless in the sky, so your Earth-based antenna doesn't have to move to track it. To use the Moon as a reflector, you would need motors and tracking mechanisms to slew the dish to point at the Moon. The cost of the tracking mechanisms would certainly be over $100 each. $100 per dish times how many satellite dishes are there? and pretty soon putting a satellite in geosynch looks like the lower-cost option.

Answer 2

Moon cannot be used for communication purposes as it does not have any equipments and its time period of rotation differs from that of the earth.