Kenwood TK-780 Service Manual

Also see for TK-780 series: Programming instructions Instruction manual Service manual supplement Service manual Instruction manual

3TK-7804. INSTALLATION PLANNING – CONTROL STATIONS4-1. Antenna systemControl station. The antenna system selection dependson many factors and is beyond the scope of this manual.Your KENWOOD dealer can help you select an antenna sys-tem that will best serve your particular needs.4-2. Radio locationSelect a convenient location for your control station radiowhich is as close as practical to the antenna cable entrypoint. Secondly, use your system’s power supply (whichsupplies the voltage and current required for your system).Make sure sufficient air can flow around the radio and powersupply to allow adequate cooling.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, and align-ment procedures contained in this manual.NoteWhen you modify your radio as described in system set-up, take the following precaution.The rating of pin 7 (SB) of the accessory connector cable(KCT-19) on the rear of the radio is 13.2V (0.75A). Insert a 1Afuse if you use the SB pin for external equipment.Accessory connectorcable (KCT-19)If you do not intend to use the 3.5-mm jack for the exter-nal speaker, fit the supplied speaker-jack cap (B09-0235-05)to stop dust and sand getting in.GENERAL / OPERATING FEATURESSpeaker-jack cap(B09-0235-05)1. Operation FeaturesThe TK-780 is a VHF FM radio designed in both 5-tonemodel and DTMF/2-tone/DMS model. The programmablefeatures are summarized.This transceiver can handle up to 250 groups with 250channels in each group.Model 5-tone BasicDTMF/2-tone/DMS FullFull (Special setting)1-1. 5-tone ModelIn this model, you can program Basic or Full level fea-tures. When you select Basic level, only 1 frame 5-tone canbe programmed, and various functions are limited.When you select "Special setting" in the Full level, youcan use encode/decode format. Using encode/decode for-mat, you can further program the transceiver to run thescript.1-2. DTMF/2-tone/DMS ModelYou can use option signalling which is DTMF or 2-tone(only for decode) or DMS (Digital Message System-FFSKsignalling) for every channel.2. Transceiver Controls and Indicators (Fig. 1)2-1. Front Panel ControlsAll the keys on the front panel are momentary-type pushbuttons. The functions of these keys are explained below.• POWER keyTransceiver POWER key. When the power is switchedoff, all the parameters, such as the group and channel, arestored in memory. When the power is switched on again,the transceiver returns to the previous conditions.• CHANNEL UP/DOWN key• CALL key (Programmable)• key (Programmable)• A, B, C and D key (Programmable)• VOLUME UP/DOWN key (Programmable)• BUSY/TX LEDThe BUSY indicator (Green LED) shows that the channelis in use. The TX indicator (Red LED) shows that you aretransmitting.13+–761315