Extra exam question E9A07
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9A
What is the effective isotropic radiated power (EIRP) of a repeater station with 200 watts transmitter power output, 2 dB feed line loss, 2.8 dB duplexer loss, 1.2 dB circulator loss, and 7 dBi antenna gain?
- A.159 watts
- B.252 watts (correct answer)
- C.632 watts
- D.63.2 watts
WhyA repeater station with 200 watts transmitter power output, 2 dB feed line loss, 2.8 dB duplexer loss, 1.2 dB circulator loss, and 7 dBi antenna gain has an effective isotropic radiated power of about 252 watts. EIRP references gain to an isotropic radiator directly, so no dBd-to-dBi conversion is needed here: summing -2 dB feed line, -2.8 dB duplexer, -1.2 dB circulator, and +7 dBi antenna gain nets to +1.0 dB, and 200 watts times 10 to the power of 1.0/10 works out to about 252 watts, answer B. The other figures come from omitting a loss term or misapplying the dB conversion to these particular values.
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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