Advanced Qualification · A-007 Feedlines and matching · A-007-006-006
A transmitter has a power output of 100 watts. There is a loss of 1.30 dB in the transmission line, a loss of 0.2 dB through the antenna tuner, and a gain of 4.50 dBd in the antenna. The Effective Radiated Power (ERP) is:
- A800 watts
- B400 watts
- C100 watts
- D200 watts
Correct answer: D — 200 watts. From the official ISED question bank, verified word for word.
Why
The transmitter puts out 100 watts, but the antenna adds 4.50 dB of gain while the feedline and tuner remove only 1.50 dB of power. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.
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