Kenwood FM Transceiver TK-481 Service Manual

Also see for FM Transceiver TK-481: User manual Instruction manual Specifications Instruction manual Service manual

3TK-480/481OPERATING FEATURES1. Operation FeaturesThe TK-480/481 is an 800/900MHz band EFJ LTR™-com-patible trunked radio designed to operate in both trunkedand conventional modes. The programmable features aresummarized.Model Trunking modeConventional modeThis model can handle up to 32 systems with up to 250groups in each system. The transceiver can be used in bothtrunked mode and conventional mode. Systems, groups,and their functions are programmed.2. Transceiver Controls and Indicators2-1. Physical Layout541 2 3Microphone Speaker6101112978Note : The transceiver is also available without the DTMFkeypad ( ).2-2. Panel controlsThe key on the top and front panel is momentary-typepush buttons. The functions of these keys and knob are ex-plained below.Antenna connectorConnect the supplied antenna here.System or Group selector knob (Programmable)Turning the system (or group) selector knob clockwiseincreases the system (or group) number by one. Turningthe knob in the counterclockwise direction decreases thesystem (or group) number by one.After the system number (or group number) reaches thehighest system number (or group number), it goes backto lowest system number (or group number).System numbers (or group numbers) not set are skipped.Caution : The FPU (KPG-49D) allows selecting betweensystem selector and group selector.Volume/Power switchTransceiver Power and Volume switch. Turn clockwise toswitch On the transceiver. Turn counterclockwise fully toswitch OFF the transceiver. Also adjusts the volumelevel. When the power is switched off, all the param-eters, such as the system and group, are stored inmemory. When the power is switched on again, the sys-tem returns to the previous conditions.Auxiliary (orange) key (Programmable)Battery pack release catchPush down to release the battery pack. See Installing theNi-Cd Battery Pack.MONITOR key* (Programmable)PTT (Push-To-Talk) keyPress this key, then speak into the microphone to call astation.LAMP key* (Programmable)TX/BATT indicatorThis red LED lights during transmission (it does not lightduring busy or when transmit is prohibited). If the batteryvoltage falls below the programmed voltage during trans-mission, the brightness of this indicator decreases at in-tervals of about one second, so it can be used as the bat-tery voltage alert function.S, A, B, and C key (Programmable)DTMF keypad (keypad model only)Press the keys on the telephone keypad to send DTMFtones.Universal connectorConnect the external KMC-25 speaker/ microphone (op-tional) here. Otherwise, keep the supplied cover in place.* : MONITOR and LAMP are arbitrary names chosen forthese buttons. They can be used for any of the auxiliaryfunctions.2-3. Programmable keysThe FPU (KPG-49D) enables programmable keys to se-lect the following functions.Auto Tel, AUX(only when Voice Scrambler is not se-lected), DTMF ID (BOT), DTMF ID (EOT), Display Character,Emergency (only AUX key), Function, Group Down, GroupUp, Home Group, Key Lock, Lamp, Memory (RCL/STO),Memory (RCL), Memory (STO), Monitor A, Monitor B, Moni-tor C, Monitor D, Redial, RF Power Lo, Scan, Scan Del/Add,Scan Temporary Delete, Scrambler (Only when VoiceScrambler is selected), SP Attenuation (Only MIC switch),System Down, System Up, TEL Disconnect and none.These functions the FPU programs to the function keysare described in the following sections.