Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-004-002
How can a single-sideband phone signal be produced?
- ABy using a reactance modulator followed by a mixer
- BBy using a balanced modulator followed by a filter
- CBy driving a product detector with a DSB signal
- DBy using a loop modulator followed by mixer
Correct answer: B — By using a balanced modulator followed by a filter. From the official ISED question bank, verified word for word.
Why
A balanced modulator creates a double-sideband signal that contains both upper and lower frequencies but no carrier. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
Drill A-005 — free, no account