Extra exam question E9A06
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9A
What is the effective radiated power (ERP) of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?
- A.317 watts (correct answer)
- B.2,000 watts
- C.126 watts
- D.300 watts
WhyA repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain has an effective radiated power of about 317 watts. Summing the dB terms: -4 dB feed line, -3.2 dB duplexer, -0.8 dB circulator, and +10 dBd antenna gain nets to +2.0 dB, and 200 watts times 10 to the power of 2.0/10 works out to about 317 watts, answer A. The other figures come from omitting one of the loss terms or misapplying the dB-to-power conversion.
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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