JTS R-4 Instruction Manual page 51

Sensitivity: microphone input sensitivity
Normal GAIN：+15dB
sensitivity
GAIN：+12dB
GAIN：+9dB
GAIN ：+6dB
GAIN：+3dB
GAIN：0dB
GAIN：-3dB
GAIN：-6dB
GAIN：-9dB
GAIN：-12dB
GAIN：-15dB
◎     A TT: Microphone input attenuation
At oFF No attenuation for
audio input
At on 20dB attenuation for
audio input
◎  R FP: RF power of the transmitter
Two output levels can be chosen
(as per local regulation)
rF Lo 10mW(default)
rF Hi 50mW
◎AUTO-OFF: time to turn off microphone automatically (in Mute status)
OFF Deactivated
1 1 minute to auto off
10 10 minutes to auto off
30 30 minutes to auto off
Note: default is 10 minutes.
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The sensitivity is at GAIN 0dB (default)
as shown above.
The audio input attenuation is
20dB as shown above.
RFP low
RFP Hi