POLMAR DB-10 - FM RADIO FUNCTION; DTMF Encoding; DTMF signaling

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Reverse the frequency
Under standby mode, long press to turn on this function, “R” will displayed
at the top of LCD when you turn on this function. At this time, radio’s transmitting
frequency is its receiving one, and its receiving frequency is its transmitting one.
If it is been set the CTCSS/DCS, the code will also been exchanged.
MONI
MONI: Press and hold this key disables the noise squelching action, allowing you
to hear very weak signals near the back-ground noise level.
FM radio
Under standby mode, press + MONI, you can input the frequency of radio or
press, then 1 to search the FM, it will stop when the FM found, if you want to
continue to search the FM press then 1. Can turn off the radio by pressing the
PTT, press + MONI, can exit the FM radio function.
Tone Calling (1750Hz Tone)
To access a repeater, press and hold in “call” key for the amount of the time
speciedbytherepeater.The transmitterwill automaticallybeactivated,and
a 1750Hz audio tone will be superimposed on the carrier. Once access to the
repeater has been gained, you may release “Call” key and use PTT for activating
the transmission.