Extra exam question E9A02
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9A
What is the effective radiated power (ERP) of a repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain?
- A.469 watts
- B.78.7 watts
- C.420 watts
- D.286 watts (correct answer)
WhyA repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain has an effective radiated power of about 286 watts. Effective radiated power totals the dB gains and losses and applies that net figure to the transmitter power: -2 dB feed line, -2.2 dB duplexer, and +7 dBd antenna gain sum to +2.8 dB net, and 150 watts times 10 to the power of 2.8/10 works out to about 286 watts, answer D. The other figures come from omitting one of the loss or gain terms, or applying the dB conversion incorrectly.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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