Thank YouWe are grateful you have chosen Kenwood for your landmobile radio applications.noTices To The user◆ Government law prohibits the operation of unlicensed radiotransmitters within the territories under government control.◆ Illegal operation is punishable by fine and/or imprisonment.◆ Refer service to qualified technicians only.Safety: It is important that the operator is aware of, andunderstands, hazards common to the operation of anytransceiver.Terminal DescriptionsSpeaker/ Microphone JacksIt is possible to use a resin-based cover for the Speaker/ Microphone jacks.NO. Name Description Impedance I/O1 PTT / RXD External PTT Input / SerialData Input CMOS I2 MIC External MIC Input 1.8 kΩ I3 MICIN Internal MIC Output 1.8 kΩ O4 OPTDET External Option Detect High Impedance I5 5M 5V Output 100 Ω O6 AE GND GND −7 TXD Serial Data Output CMOS O8 NC No Connection − −9 SPO Audio Input 8 Ω I10 SPI Received Audio Output 8 Ω OAntenna Terminal50 Ω impedanceBattery TerminalThe battery terminal uses a spring plate.The negative terminal connects to the chassis ground.The battery is mounted on the rear side of the transceiver using a latchmounting method.