Cecil,

Check with Melles-Griot on this one.

Hint: Think conservation of energy. Them joules gotta go somewhere.

However, in reality the opposite happens. As the antenna load goes to
infinity the scattering cross section (i.e. retransmission) goes to zero
faster than the capture cross section.

(Plagiarized from Kraus Antennas, 2nd ed.)

73,
Gene
W4SZ

Cecil Moore wrote:


Something I have wondered about: If we simply amplify
the receiver voltage through a near infinite impedance
FET with virtually no load on the signal, do we get the
signal information but lose virtually all the power to
re-radiation? (assume high S/S+N)