The Basic lessons · Regulations and policies · B-001-019

Keeping Signals Stable and Clear: Frequency and Modulation Rules

Learn why your radio must stay on frequency and how to avoid distorting your voice. This lesson explains the rules for signal stability and the limits of voice modulation.

This lesson is part of SignalPrep Pro. The subsection's 6 exam questions are free to practise: practise B-001-019.

What this subsection asks

• What do Canadian regulations stipulate regarding frequency stability in the amateur radio service?
• Which of the following emission modes requires that an amateur radio station have means to prevent or indicate overmodulation?
• Amateur radio stations are required to have means of indicating or preventing a signal quality problem unique to voice transmissions. What is it?
• What is the maximum percentage of modulation permitted for amateur radio voice communications?
• What must all amateur radio stations be capable of reliably measuring, regardless of emission mode?
• What is the maximum percentage of modulation permitted for amateur radio voice communications?