What is an isotropic radiator?
AnswerA hypothetical lossless antenna that radiates equally in all directions and serves as a gain reference.
The isotropic radiator is an ideal reference, not a physically realizable practical antenna.
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E9 · Antennas and Transmission Lines
Amateur Extra · correct answers only, in question-pool order.
A repeater has 150 W transmitter output, 2 dB feed-line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain. What is its ERP?
AnswerApproximately 286 watts ERP.
Combine gains and losses in dB: net antenna-system gain is about +2.8 dB, which raises 150 W to roughly 286 W ERP.