Kenwood TM-241A Instruction Manual

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4.2.2 Fixed StationA regulated DC power supply (13.8 VDC capable ofsupplying at least 11 amperes) is required. PS-33 isrecommended.1. Never connect the AC power cable to the ACoutlet until all other connections have beenmade.2. Before connecting and disconnecting the powerconnector, be sure to turn OFF the POWER :switches of both the transceiver and the DCpower supply.| 3. Observe polarity of the DC power cable. Thetransceiver operates on 13.8 VDC, negative|ground. Battery polarity must be correct. Thepower cable is color coded :Red — + (Positive polarity)Black — — (Negative polarity)4-2-3 AntennaThetypeofantennathatisusedwillgreatlyaffect theperformanceofthetransceiver.Useaproperly adjustedantenna,ofgoodquality,toenable your transceivertoperformatitsbest.Theantennainputimpedanceis50ohms.Use50-ohmcoaxial cable suchasRG-8Uor8D-2Vforthisconnection.Iftheantennaisfarfromthetransceivertheuseoflowlosscoaxial cable,suchasRG-8Uisrecommended.Matchtheimpedanceofthecoaxial cableandthatoftheantennasothattheSWRislessthan1.5 to1.TheprotectioncircuitinthetransceiverwillactivateiftheSWRisparticularlypoor(greater than3to1).HighSWRvalueswillcausethetransmitter outputtodrop,andmayleadtoTVIorBCIreports.»Caution:||;We recommendthatyouinstallahighqualitylightening arrestorinyourantennalinesforprotection againstfire,electricshock,personalinjury,or damage to the radio itself.