Kenwood TK-940 SystemIGroup Revert, Last call revert, Last use revert, Scan Message Wait

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OPERATING FEATURES

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3-5. SystemIGroup Revert

SystemIGroup revert can be programmed for one of the following:

Last call revert

The system or group changes to the revert system or group when a call IS received with the system or group being scanned.

Last use revert

If a systemlgroup call is received during scanning and the PTT button 1s pressed for transmission and re- sponse within the drop out delay time, the system or group is assigned as the new revert system or group.

3-6. Scan Message Wait

The time for staying wlth the home repeater that receives a signal during system scan and monitoring data messages can be programmed. If there is no sig- nal from the home repeater, the system is scanned for about 50ms. If there is a signal, three data messages are monitored. Normally, three data messages are monitored for each system, and it can be increased in multiples of three data messages per line to up to eight lines.

If the repeater data message indicates that there is no call, data monitoring is terminated and the home repeater of the next system is scanned.

3-7. Call Indicator

The call lndlcator can be programmed for each group In trunked systems, ~tcan be set to respond to a selectable decode ID or one of t w o flxed IDS, except block IDS When a call IS recelved wlth a selectable decode ID, the call Indicator flashes When a call 1s recelved wlth a flxed ID, the call lndlcator lights con- tinuously.

In a convent~onalsystem, the call indicator can be programmed t o l~ghtfor each QT or DQT code It keeps flashlng while a call IS belng recelved It IS turned off by presslng any front panel key

3-8. Time-Out Timer

The tlme-out timer can be programmed In 15 sec- onds increments from 15 seconds to ten mlnutes for patch and Interconnect operat~ons If the transmlt- for longer than the pro- ter IS dlsabled and a warn- P l T button IS held down. he P l T button IS released. ute for dlspatch and three

3-9. Priority ID Codes

The priority of the programmable decode ID codes for each system is as follows:

1)Fixed ID code 1

2)F~xedID code 2 3 ) Selected ID code

4)Other selectable ID codes (Group scan only)

5)Block decode codes

When a call with a higher priority is received, that call is received immediately (except when the trans- ceiver is trunked out).

3-10. Group Scan Operation

Group scan can be programmed for each group. In addition to the ID codes of the selected group, the ID codes of the other groups that are permitted for group scan are decoded. (The t w o fixed ID and block decode codes are always decoded.)

If, during group scanning, a call is recelved with one of the selectable group ID codes for which group scan is enabled, the group display indicates the group num- ber that the call came in with. That group then be- comes the new selected group. Group scan resumes after the specified drop-out delay time or dwell time shared by the system scan elapses.

3-11. Transmit Inhibit

The transceiver can be programmed wlth a transmit inhibit block of ID codes. If an ID code within this block is decoded the preset time before the PTT button is 'pressed,transmission is inhibited. The BUSY indicator lights and a busy tone sounds until the PTT button is released to indicate that transmission is not possible (except clear-to-talk mode).

Transmission with the group for which the encode ID is not set is inhibited, and the busy tone is output while the PTT button is held down, regardless of the clear-to-talk setting.

3-12. TEL ID Codes (TEL MODE)

The ID code in the TEL ID block can be used to make a phone call by programming the block. To make a phone calls, an optional DTMF microphone is required.

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Contents $@$, ~\, !? .- $LU~CO .i@&4170-XX FX-R%~?ONIT1x57-4590-XXI BIZTesting GeneralDC Power and wiring Installation Planning Control Stations 5-1. Antenna systemAntenna RadioSystem SET-UP Operating Features Front Panel Displays and Indicators System display Scan indicatorDelete 1 indicator Busy indicatorDetails of Features Time-Out Timer TEL ID Codes TEL ModeSystemIGroup Revert Last call revertFree System Ringback System SearchTranspond Preferred System RevertDelay tone Auto TELAudible User Feedback Tones Proceed toneTransmit disable receive-only channels Call indicator, alert toneConventional System Operation Talk-aroundHorn Alert Non-continuousContinuous System Scan Type Fix system scanData Program Mode Transceiver ProgrammingIr 4-1.lntroduction KPG-4 Description Optional PC programming interface cableClone Mode Figure Dealer modeDescription of Each Modes System keyPanel Tuning Mode Volume keyGroup key Scan keyInstalling the Signaling Unit KDD-4 Dtmf Option KDD-4assemblyInstallation Installing the KDD-4 in the transceiverAccessory Connection Cable KCT-19 Option Jumper setup chartsMonireset ON-HOOK OFF-HOOK JU2 JU3 JUJ Mute UrimuteTerminal function GNDConnecting the KCT-18 to the transceiver R5 and R6 setup chartIgnition Sense Cable KCT-18 Option Modifying the transceiverConnection procedure External SpeakerKES-3 Option KES-4 OptionFitting the Control Panel Upside Down Page Page Page Page RF unit If unitMCF ANT AMP If System -AMPSP PLL MIC AMPAudio amplifier unit Squelch circuit Microphone amplifier PLL Buff IRF AMPVcxo DET InvswControl unit Horn control Power supply circuitPLL data output LCD Assembly Power switch circuitCPU Tone generatorBlock diagram Terminal connection diagramTerminal connection diagram Terminal function Eeprom AT24C02NlOS12.7 TX-RX Unit IC201Test DEC DINMicroprocessor 78312AGF3563BE TX-RX Unit IC209 Microprocessor 75308BGK740BE9 LCD Assy IC2 TEST2 TEST1 CLKOutput a NJM78L05UA EepromDTA114EU--DC DTA114YULCD Assy B38-0731-05 Cc4riq Rating wattageTK-940/941 KusaTapttte Screw A T Head T a P T T I E Sciiewpannel Screw SET Insulating Tube ANT Cable Speaker 16 QHM 1W MicrqphqnbY4U Icpqwer Modulej .. Drive TX-RXW w w W W 1 W l I P C X E D C UuupiU U P F U P FR c Hesbnatuh ES $j Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Pattern Page Foil side IC20E Dtci 14EU DTCI44EU Page Page Component side PC Board View ~ o h ~ o n esident Page TX-RX Unit TX-RX Section X57 4590 XX A/2 11 TK A1 PLL O w m o d +4- aLIE- - aIz23z= Page Ccrl--------ASSYDISPLAY S~ECTION838 Eqqzj

TK-940 specifications

The Kenwood TK-940 is a highly regarded mobile two-way radio that has earned a reputation for its ruggedness, reliability, and excellent communication capabilities. Designed for professionals in various sectors such as public safety, transportation, and construction, the TK-940 incorporates advanced technologies to meet the demanding needs of users in the field.

One of the standout features of the TK-940 is its robust design, which complies with military specifications for durability. Its construction allows it to withstand harsh environmental conditions, making it suitable for outdoor and challenging work environments. The radio is also equipped with a water-resistant casing, ensuring that it can function reliably even in wet conditions.

The TK-940 operates in the VHF frequency range, providing wide coverage and strong signal penetration. With a power output of up to 110 watts, users can achieve long-range communication, essential for coordinating activities over large areas. The radio supports both analog and digital modes, allowing seamless integration into various communication systems while maintaining high audio clarity.

Another significant feature of the TK-940 is its enhanced audio quality. The radio is equipped with Kenwood's advanced noise cancellation technology, which minimizes background noise and ensures clear voice communication even in noisy environments. The audio output is powerful and adjustable, catering to individual user preferences.

Moreover, the TK-940 supports a variety of signaling options, includingDTMF, MDC-1200, and 2-Tone/5-Tone signaling, facilitating efficient communication. These signaling features enhance interoperability with other communication devices and systems, allowing users to communicate seamlessly with teams or dispatch centers.

Kenwood has also incorporated user-friendly functionalities into the TK-940. It boasts an intuitive user interface with programmable buttons, enabling quick access to essential features. The large, backlit display provides clear visibility and is easy to read in various lighting conditions.

The TK-940 is designed with safety in mind, featuring emergency alerts and lone worker protection, ensuring users can communicate their status in critical situations. Overall, the Kenwood TK-940 is a powerful and versatile mobile radio that combines durability, advanced technology, and user-friendly features, making it an ideal choice for professionals who require reliable communication in the field.