In a message dated 09/12/2006 00:04:00 GMT Standard Time, bruninga@usna.edu writes:

Yes. They are pulsed at different rates so the ranging station can tell which one they are seeing. The rates are between 1 to 6 flashes per second or so... Simply ON/OFF. Bob

Ahhhh.........I suspect that's going to be Vy difficult. 100 to 600Hz would have been much easier.

Good luck

David G0MRF