--
Ed Huntress
(remove "3" from email address for email reply)
"axolotl" wrote in message
...
Ed Huntress wrote:


For one thing, it's a matter of coherent radiation.

Say what?


Ed, antennas are reciprocal devices. One of the more convienient ways to
measure the characteristics of an antenna is to build two identical
antennas, point them at each other, using one as receive and one as
transmit, and divide the gain. An impedance mismatch on the receive side
means some of the energy you are trying to gather will be reflected back
out the antenna. The primary difference between transmit and receive is
that the transmit structure has to handle more power- bigger conductors
with more or better dielectrics to take the voltage. The Ls and Cs dont
change.

Kevin Gallimore


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