Kenwood FM Transceiver TK-481 Service Manual

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

4TK-480/481 OPERATING FEATURES Auto TELAutomatically connects available repeaters that are con-nected to telephone circuits when operating as LTR system.The time allocated to search for available repeaters is 60seconds, after which connection failure occurs, a DTMFtone is output and the function terminates.If connection to an available circuit is made, only ID 253,EOT or hang-up time-out can terminate the function. AUXThis function can be programmed when the voice scram-bler board is not installed.If this key is pressed, an underscore (“_”) appears at theextreme right of the LCD and AUX port which is inside of thetransceiver turns to the active level. If pressed again, theunderscore disappears and the AUX ports turns to thedeactive level. DTMF ID (BOT)Pressing this key in Conventional mode, automaticallysends the preset Connect ID. DTMF ID (EOT)Pressing this key in Conventional mode, automaticallysends the preset Disconnect ID. Display characterThis key switches the LCD display between the system/group number and system/group name. EmergencyPressing this key for longer than the programmed “Emer-gency Key Delay Time” causes the transceiver to enter theemergency mode. The transceiver jumps to the pro-grammed “Emergency System/Group” and transmits forthe programmed “Active Time”.The transceiver disables mic mute while transmitting.After finishing transmission, the transceiver receivers forthe programmed “Interval Time”. The transceiver mutesthe speaker while receiving. Following the above sequence,the transceiver continues to transmit and receive.If “Man Down Switch” has been programmed on the ra-dio and the switch is activated, the radio enters Emergencymode after the specified “Man Down Delay Time” expires. FunctionPressing this key causes the transceiver to display“FCN”. Then, pressing a DTMF key causes the correspond-ing programmed function to start. This key may be conve-nient when using many functions with the 12-key keypad(K2 type). Group up/downWhen the key is pressed each time, the group number tobe selected is incremented/decremented and repeats if heldfor one second or longer. Home groupEach pressing of the key selects a preset system/group. Key lockPressing this key causes the transceiver to accept entryof only the [Function], [Key Lock], [PTT], [Lamp], [Monitor A],[Monitor B], [Monitor C], [Monitor D], and [Emergency] keys.The locked keys also include the tuning control. LampThis key illuminates the LCD and keys on the front panel.When the key is pressed, the LED lamp goes on.When it is released, the lamp goes off after about fiveseconds. If any key is pressed while the LED lamp is on, thelamp is kept on for five seconds. MemoryThis key allows DTMF memory data to be recalled; up to32 memories each with a memory dial of up to 16 digits andan A/N of up to 10 digits per memory. MonitorUsed to release signalling or squelch when operating as aconventional. It is also used to reset option signalling. RedialPressing this key when System/Group is shown, displaysthe previously transmitted DTMF code. Pressing [PTT] atthis time, transmits the code that is currently displayed. RF power lowUsed to temporarily switch transmission output to lowpower. Turning the function on enables:Hi→Low, Low→LowKey states are backed up, except in the PC mode whenthey are reset. ScanPress this key starts scanning. Pressing this key stopsscanning. Scan Del/AddUsed to select whether system scan routines are usedduring system scan. Each pressing of the key (to ON)toggles between lockout and lock. The scan routine isstarted when on lock. The DEL indicator flashes when thesystem is on lockout. Scan temporary deleteThis key is temporarily deleted a system being scanned.If you press this key when scan is stopped (when a call isbeing received from another station), the system is tempo-rarily deleted and scanning restarts.This key operates even when “Scan Type” is set to “ListType System Scan”. ScramblerIf a scrambler code (1 to 4) has been set in the FPU, anunderscore (“_”) appears at the extreme right of the LCDdisplay when scrambler is active. Pressing this key changesON/OFF of scramble operation.Holding this key down for 2 seconds sets Scramble CodeSelect Mode.