Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-009-007
Why is it difficult to monitor a spread spectrum transmission?
- A It varies too quickly in amplitude
- B The signal is too distorted for comfortable listening
- C Your receiver must be frequency-synchronized to the transmitter
- D It requires narrower bandwidth than most receivers have
Correct answer: C — Your receiver must be frequency-synchronized to the transmitter. From the official ISED question bank, verified word for word.
Why
Spread spectrum signals hop rapidly across many frequencies or spread their energy thinly, making them sound like background noise to a standard radio. 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.