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Those common hand speaker mic compliant to this pin definition can be
used. When using normal Condenser or Dynamic microphone, Connect the
microphone to MIC-PTT and GND then KC908 considered the PTT is pressed.
The sensitivity of microphone is about 50mV. The speaker should be
connected to the SPEAK and GND pin. When using headphone user should
turn down the volume before plugging. In KC908's FUNC menu user can set
turn off or not the built-in speakers after plugging in this port.
This port does not support other signal input, avoid inputting a high
power signal or it may be damaged.
2.2.7 Knobs
KC908 has two knobs on the left side. The upside one is a multifunctional
knob, in different menus it has different functions. Such as after RF/CF button
has been pressed, this knob is used to switch the frequency. This knob can be
pressed to confirm the input or move the marker.
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