On Sat, 05 Jan 2013 04:02:59 -0800, JIMMIE wrote:

The beer got flowing the other day and some of my friends and I got to
BSing about the possibility of transmitting a microwave pulse and
reciving it reflected off the moon. Plans are to use a microwave oven
magnetron for the transmitter. We were wondering if this would be legal.

No, it would not be legal to do it as you described. However, there are
lots of ways to do it legally:

http://en.wikipedia.org/wiki/EME_%28communications%29

http://www.electronics-radio.com/art...r-propagation/
moonbounce-propagation-eme.php

etc. Google is your friend.