Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-004-010
How much is the carrier suppressed below peak output power in a single-sideband phone transmission?
- A At least 60 dB
- B At least 40 dB
- C No more than 20 dB
- D No more than 30 dB
Correct answer: B — At least 40 dB. From the official ISED question bank, verified word for word.
Why
In a single-sideband phone transmission, the carrier is intentionally removed to save power and bandwidth, and regulations require it to be reduced by at least 40 decibels compared to the peak output. 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.