Yamakawa M2180 - Manual (Page 12)

Operation
TA SEEK mode:
When newly turned station does not receive TA information for 5sec, the radio
retunes to next station which has not the same station (PI) as the last station, but
has the TA information. In TA seek mode, the current station can be changed to
the completely different station be cause the unit searches TA station when the field
strength of the current station is very weak, or the current station has no TA signal.
-TA ALARM mode:
Any automatic retune mode is not activated, just can be heard Beep sound.
(2) PI MUTE / PI SOUND (2)
When press the SEL button for more than 2 seconds, it is activated as selecting
mode of these function.
(3) RETUNE L/S
When press the SEL button for more than 2 seconds, it is activated as selecting
mode of these function.
(4) MASK DPI (2)
When press the SEL button for more than 2 seconds, it is activated as selecting
mode of these function.
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