Maas PT-555 User Manual - page 71
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RX power saving
Under standby mode, press [ ] continuously to enter menu 09,
LCD displays "SAV ON/OFF",
select the desired one by rotating the knob and then press [PTT] to
confirm.
ON: power saving is on
OFF: power saving is off.
TOT setting
Under standby mode, press [ ] continuously to enter menu 010,
LCD displays "TOT OFF/15/30---/300".
select the desired time by rotating the knob and then press [PTT]
to confirm. If choose "OFF" there is no limitation on transmitting.
When you choose 30S, if transmitting time more than 30S, it will
automatically turn off.
Busy channel lock
Under standby mode, press [ ] continuously to enter menu 11,
LCD displays "BCL OFF/WAV/COD", select the desired one by
rotating the knob and then press [PTT] to confirm. When choose
"OFF" BCL is off. When choose "WAV" radio will stay in the channel
which has the same frequency till signal disappears. When choose
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Beep setting
Under standby mode, press [ ] continuously to enter menu 12,
LCD displays "BP ON/OFF",
select the desired time by rotating the knob and then press [PTT]
to confirm.
ON: Beep on
OFF: Beep off
COD, radio stays on the channel which receiving carrier and QT/DQT
should be the same. It will exit until the signal disappears.
LCD display setting
Under standby mode, press [ ] continuously to enter menu 13,
LCD displays "LMP ON/KEY/OFF",
select desired VOX grade by rotating the knob, then press [PTT] to
confirm. When choose "ON" LCD lights all the time; when choose
"OFF" LCD is off. When choose "KEY" LCD will be off automatically
after 10S without any operation.