Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-009-005
Direct sequence is used with which type of transmission?
- A Packet
- B RTTY
- C Spread spectrum
- D AMTOR
Correct answer: C — Spread spectrum. From the official ISED question bank, verified word for word.
Why
Direct sequence is a method that spreads a signal across a wide range of frequencies to make it harder to jam or intercept, which is the defining feature of spread spectrum transmission. 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.