Icom IC-4A Instruction Manual page 14

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АМТЕММА СОММЕСТОВ
Connect Ше supplied flexible antenna.
An external antenna can Бе used, using а ВМС соппестог.
TRANSMIT/BATTERY INDICATOR
SOUELCH CONTROL
Sets the squelch threshold level. To turn OFF the squelch function, rotate this control com-
pletely counterclockwise. To set the threshold level higher, rotate the control clockwise.
VOLUME CONTROL and POWER SWITCH
When the control is turned completely counterclockwise, the power is OFF. Ву turning the
control clockwise beyond the "click", the unit is turned ON and the audio level increases by
further rotating it clockwise.
EXTERNAL SPEAKER JACK
When an external speaker (or an earphone) is used, connect it to this jack. Use a speaker with an
impedance of 8 ohms. When the external speaker is connected the built-in speaker does not
function.
EXTERNAL MIC JACK
When an external microphone is used, connect it to this jack. See the schematic for the proper
hookup. When the external microphone is connected, the built-in microphone does not function.
The IC-HM9 optional speaker-microphone can also be used.