Maas PT-555 User Manual - page 68
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TX CTCSS/DCS setting
Under standby mode, press [ ] twice to enter menu 02, LCD
display "TX CT/ TX DCS".
The setting method is the same to the RX CT/RX DCS setting.
Scrambler on/off
Under standby mode, press [ ] continuously to enter menu 04,
LCD displays "SCR ON/OFF",
then select [ON] by rotating the knob, then press [PTT] to confirm,
the scrambler is on. Likewise, select [OFF] by rotating the knob,
then press [PTT] to confirm, the scrambler is off.
Scan mode
Under standby mode, press [ ] continuously to enter menu 05,
LCD displays "SCN OFF/CH/CT/DCS",
then select the desired one by rotating the knob, then press [PTT]
to confirm.
OFF: Scan off
CH: Channel scanning
CT: CTCSS scanning
DCS: DCS scanning
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Priority scan
Under standby mode, press [ ] continuously to enter menu 06,
LCD displays "PRI OFF/01~128",
then select the desired one by rotating the knob, then press [PTT]
to confirm.
OFF: priority scanning off
1~128: priority scanned channel
Squelch grades settings
Under standby mode, press [ ] continuously to enter menu 08,
LCD displays "SQL 0~9",
select desired squelch grade by rotating the knob, then press [PTT]
to confirm.