Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-002-001
The output tuning controls on a transmitter power amplifier with an adjustable PI network:
- A allow efficient transfer of power to the antenna
- B allow switching to different antennas
- C reduce the possibility of cross-modulation in adjunct receivers
- D are involved with frequency multiplication in the previous stage
Correct answer: A — allow efficient transfer of power to the antenna. From the official ISED question bank, verified word for word.
Why
The output tuning controls on a transmitter power amplifier with an adjustable PI network adjust the circuit to match the impedance of the amplifier to the antenna system. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.