Yaesu FT-991A Operating Manual page 85

Using the Built-in Electronic Keyer
For left-handed operators in a contest, for example, the polarity can be reversed easily in the Menu mode without
changing the keyer connection ( the default setting is "NOR" ) .
1. Press the MENU ( SETUP ) button to engage the
Menu.
2. Rotate the MULTI knob to select Menu item "013
KEYER DOT/DASH".
3. Press the [ SELECT ] button, then rotate the
MULTI knob to select "REV."
4. Touch [ ENTER ] on the LCD to save the new
setting.
5. Press the MENU ( SETUP ) button or touch
[ BACK ] on the LCD to exit to normal operation.
FT- 991 Operating Manual
CW Mode Operation
Reversing the Keyer Polarity
Advice:
 In the steps on the left, only polarities of the
ELEKEY and ACS keyers can be changed.
MENU ( SETUP ) Button
MULTI Knob
Page 83