Icom IC-718 Quick Start Manual page 15

'Initial Set' mode – RF/SQL p.20
One uses the [ Up ]
to RF/SQL
Rotating the main tuning
rS = optimizes rf & squelch settings
At = use for best AM mode quality
Sq = Sets squelch level only
Default is 'rS'
& [ Dwn ] Buttons to navigate to navigate
knob for one of: