Kenwood TK-940 service manual Clk, Output a, TEST2 TEST1

Page 38

SEMICONDUCTOR DATA

PLL System : SC370651F or MC145190F-K (PLLIVCO I C I )

Terminal connection diagram

REFin

Din

CLK

VPD

 

 

OUTPUT A

P ;

I_UTP: : :

i3

Rx

 

 

TEST2

 

TEST1

9

12

Vcc

 

-

10

11

fin

 

fin

 

Block diagram

 

 

 

 

 

-

DATA OUT

 

 

20

P

 

 

f R

 

REFln

OSC OR

 

 

 

-

 

 

SELECTLOGIC

5OUTPUT A

 

4 STAGE

 

 

 

 

1

DIVIDER

1

/

 

N

 

REFout -

(CONFIGURABLE)

 

 

/ 3

/ 13

 

 

 

DOUBLE BUFFERED

* Bit GrabberTMR REGISTER

16 BlTS

t

Bit Grabberm C REGISTER

'1 8 BITS I

STANDBY POR

LOGIC

Bn Grabberm A REGISTER

+2 4 BlTS

 

6-STAGE

12-STAGE

 

 

A COUNTER

N COUNTER

 

fin 11

 

 

 

- 10

64/65

 

 

PRESCALER

CONTROL

 

fin

t

LOGIC

 

 

 

 

SUPPLY CONNECTIONS :

I A

Y y TEST1

 

 

 

PIN12= VCC (VcTO INPUT AMP AND 64/55pnCSCALERl

 

 

PIN5 = VPD(VcTO PHASEIFREQUENCY

'9RSA AND 8)

 

 

PIN14= VDD(V+TO BALANCE OF Cl'.f'.

 

 

 

PIN7 = GND (COMMON GROUND:

Page 37 Page 39
Image 38
Page 37 Page 39
Contents $@$, ~\, !? .- $LU~CO .i@&4170-XX FX-R%~?ONIT1x57-4590-XXI BIZTesting GeneralAntenna DC Power and wiringInstallation Planning Control Stations 5-1. Antenna system RadioSystem SET-UP Operating Features Delete 1 indicator Front Panel Displays and Indicators System displayScan indicator Busy indicatorDetails of Features SystemIGroup Revert Time-Out TimerTEL ID Codes TEL Mode Last call revertTranspond Free System RingbackSystem Search Preferred System RevertAudible User Feedback Tones Delay toneAuto TEL Proceed toneConventional System Operation Transmit disable receive-only channelsCall indicator, alert tone Talk-aroundContinuous Horn AlertNon-continuous System Scan Type Fix system scanIr 4-1.lntroduction Data Program ModeTransceiver Programming KPG-4 Description Optional PC programming interface cableDescription of Each Modes Clone Mode FigureDealer mode System keyGroup key Panel Tuning ModeVolume key Scan keyInstalling the Signaling Unit KDD-4 Dtmf Option KDD-4assemblyInstallation Installing the KDD-4 in the transceiverMonireset ON-HOOK OFF-HOOK JU2 Accessory Connection Cable KCT-19 OptionJumper setup charts JU3 JUJ Mute UrimuteTerminal function GNDIgnition Sense Cable KCT-18 Option Connecting the KCT-18 to the transceiverR5 and R6 setup chart Modifying the transceiverKES-3 Option Connection procedureExternal Speaker KES-4 OptionFitting the Control Panel Upside Down Page Page Page Page MCF ANT AMP If System -AMPSP RF unitIf unit PLL MIC AMPAudio amplifier unit Squelch circuit Microphone amplifier Vcxo PLLBuff IRF AMP DET InvswControl unit Horn control Power supply circuitPLL data output CPU LCD AssemblyPower switch circuit Tone generatorBlock diagram Terminal connection diagramTest Terminal connection diagram Terminal functionEeprom AT24C02NlOS12.7 TX-RX Unit IC201 DEC DINMicroprocessor 78312AGF3563BE TX-RX Unit IC209 Microprocessor 75308BGK740BE9 LCD Assy IC2 TEST2 TEST1 CLKOutput a DTA114EU--DC NJM78L05UAEeprom DTA114YULCD Assy B38-0731-05 Cc4riq Rating wattageTK-940/941 KusaY4U Tapttte Screw A T Head T a P T T I E Sciiewpannel Screw SETInsulating Tube ANT Cable Speaker 16 QHM 1W Micrqphqnb Icpqwer Modulej .. Drive TX-RXW w w W W 1 W l U U P F I P C X E D CUuupi 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.
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