Kenwood FM Transceiver TK-481 Service Manual

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

10TK-480/481 Number of RetriesNumber of Retries is the maximum number of retrytransmission when no acknowledgement is received in theMaximum ACK Wait Time. Increase this item to improvedata communication reliability. TX Busy Wait TimeTX Busy Wait Time is the maximum amount of time be-fore giving up the data transmission when the channel (or allthe repeater channels for Trunking mode) is busy. Also, thistimer affects if it expires during Random Access period. Maximum ACK Wait TimeMaximum ACK Wait Time is the maximum amount oftime to wait for an acknowledgement from the called radiounit. It is used as an interval time of retries. It must be setgreater than the ACK Delay Time of the called radio unit. ACK Delay TimeACK Delay Time is the amount of time from the end ofreceiving a data to the beginning of sending anacknowledgement. It should be adjusted as the repeater’shang-up delay time. Also, it must be set less than the Maxi-mum ACK Wait Time of the calling radio unit. TX Delay Time (RX Capture)TX Delay Time is the amount of unmodulated transmis-sion to let the called unit stop scanning or exit its batterysave mode. It is used only when starting a data communica-tion sequence. Data TX Modulation Delay TimeData TX Modulation Delay Time is the amount of timefrom the beginning of transmission to the beginning of adata modulation. It is used every time data is transmitted.It must be set to more than 300ms if data communication ismade in Trunking Mode.7. Audible User Feedback TonesThe transceiver outputs various combinations of tones tonotify the user of the transceiver operating state. The maintones are listed below.The high tone is 1477Hz, the mid tone is 941Hz, and thelow tone is 770Hz.7-1. Power On ToneThis tone is output when the transceiver is turned on.(The high tone is output for 500ms.)7-2. Alert ToneThis tone is output when the transceiver is TX inhibitionfor TOT and PLL unlocked. It is output until the PTT buttonis released. (The 697Hz tone is output.)7-3. DBD On ToneWhen a D.B.D. code is received, transpond tone sounds.7-4. DBD Off ToneWhen a D.B.D. release code is received, transpond tonesounds.7-5. Password Agreement ToneWhen the correct password is entered, the tone sounds.The optional feature's control tone can be set to yes or no.7-6. PTT Release ToneWhen you release the PTT switch, the PTT release tonesounds.7-7. Busy ToneSounds in LTR mode, when you cannot use a repeater(system busy or TX inhibit). Sounds in conventional mode,when busy channel lockout is functioning. You can selectyes or no for the optional feature's warning tone.7-8. Group Call ToneSounds when a group call with the correct DTMF optionsignalling is received, repeats 7 times. You can select yes orno for the optional feature's warning tone.7-9. Individual Call ToneSounds when an individual call with the correct DTMFoption signalling is received. You can select yes or no forthe optional feature's warning tone.7-10. Key Press Tone [A]Sounds when a key is pressed. For toggle keys, soundswhen toggle function is turned on (key press tone [B]sounds when it is turned off). You can select yes or no forthe optional feature's control tone.7-11. Key Press Tone [B]Sounds when a key is pressed. For toggle keys, soundswhen the toggle function is turned off (key press tone [A]sounds when it is turned on). You can select yes or no forthe optional feature's control tone.7-12. Key Press Tone [C]Sounds when a key is pressed. Also sounds when stor-ing data, adding a DTMF code to memory, and when chang-ing test mode settings. You can select yes or no for theoptional feature's control tone.7-13. Key Input Error ToneSounds when a key is pressed but that key cannot beused. You can select yes or no for the optional feature'swarning tone.7-14. Roll Over ToneSounds at the smallest system/group. You can selectyes or no for the optional feature's control tone.7-15. Transpond ToneSounds when an individual call with the correct LTR/DTMF option signalling is received. For group calls, only thegroup tone will sound, not the transpond tone.OPERATING FEATURES