Philip - Are you serious about these things having a power output of a kW ? Neville. Just guessing Neville, as I was only giving you an example., They would surely be radiating much or many more times what one would expect from reflected light which is all the telescope would have to focus on. I will get the real power roday.. I was vaguely referring to the output of Australias own Aussat Network. Also power radiated by an antenna is a numerical multiple of the actual power in. " directivity gain. " Think of a 5 watt flashlight bulb without a reflector, compared with a reflector. A 5 watt bulb could give a beam equivalent of say 50 watts. So I will need to check the actual transmitter figures. Philip.