Icom IC-746PRO Manual page 120

• This function is useful when you don't
want unmodulated signals pausing or
canceling a scan. When the voice scan
control function is activated, the
receiver checks received signals for
voice components.
• If a receiver signal includes voice
components, and the tone of the voice
components changes within 1 sec., scan
pauses (or stops). If the received signal
includes no voice components or the
tone of the voice components does not
change within 1 sec., scan resumes.
VSC