Basic Qualification · B-002 Operating and procedures · B-002-001-005
What is a CTCSS tone?
- AA sub-audible tone that activates a receiver audio output when present
- BA tone used by repeaters to mark the end of a transmission
- CA signal used for telemetry by amateur radio satellites
- DA signal used for radio control of model craft
Correct answer: A — A sub-audible tone that activates a receiver audio output when present. From the official ISED question bank, verified word for word.
Why
CTCSS stands for Continuous Tone Coded Squelch System, which uses a low-pitched tone below the range of human hearing to open a receiver's squelch. The full explanation — and one for every question — is in Pro.
Practise this section
Operating and procedures is section B-002 of the Basic exam: How to operate: calling, phonetics, Q-signals, repeaters, nets, emergency traffic, and the courtesies that keep a band usable.
Drill B-002 — free, no account