Kenwood Comprehensive Guide to Marine Radio Features and Functions
Page 13

TS-440S

CIRCUIT DESCRIPTIO N

VsF is compared with voltage from IC8 pin 6 (5 .5 V) . When SWR increases, VSF lowers and the voltage leve l of IC8 pin 8 rises . At IC7 pin 3, a triangular wave is moni - tored . The triangular wave is compared with the wav e from IC8 pin 8 and output . The triangular wave is con- verted to a square wave by IC10 and sent to switch Q 3 and Q4 . This voltage is used as the SWR control voltage .

Output voltage from IC8 pin 2 consists of the voltage com - pared with VsR/Vs F and + 5 DC voltage . It is distribute d to IC4 the level shift/meter amplifier to move the needl e in the SWR meter and IC5 the V-I convertor to control th e AT440 .

VR14 is used to adjust the SWR meter ZERO point . VR 13 is for SWR meter adjustmen t

3) FULL/SEMI BREAK-IN and VOX circuits

 

 

RL TXB RX B

MICROPROCESSOR

STAND-B Y

CONTRO L

CIRCUIT

POWER SUPPLY

CONTRO L

 

 

CIRCUIT

 

 

KEYIN G

 

 

CIRCUI T

 

 

VO X

CIRCUIT

Fig . 9-1 FULL/SEMI BREAK-IN block diagra m

When the standby switch, the key, or the VOX switchin g transistor are activated, a ground is applied to the input pi n of the control circuit, which causes a standby signal to b e fed to the microprocessor to determine if a valid transmit con - dition has been met . When that condition has been met, th e

KEYIN G

STAND-B Y

VOX

standby circuit in the IF unit will be turned on .

A keying signal is generated by the control circuit, wheneve r the key is depressed, to control the keying circuits in the I F unit . This keying signal is also used as the transmit/receiv e signal during break-in operations .

o KEYING (FULL)

o CONTROL( FULL )

o KEYING(SEMI )

0 CONTROL(SEMI )

Fig . 9-2 FULL/SEMI BREAK-IN timing chart

13

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Contents KEN Wood TS-440S Semiconductors DimensionsImage ratio If rejection Selectivity SensitivityFrequency accuracy RIT/XIT OFF Frequency stabilityFig Frequency configuratio n Ipll Circuit Descriptio NUSB, LSB, FS K Fig Receiver circuit configuratio nAM, FM Displayed frequencie sFig Selectivity control circuit Circuit DescriptionMCF L71-0259-05 RF Unit Fl Filter selectiveCeramic filter L72-0355-05 if Unit CF2 BX7I91- 851 Circuit Descriptio NBX719 D27 D2 Fig Notch circui tTransmitter Circuit Descriptio n TS-440$ SWR protection circuit Fig Antenna tuner circuitSWR automatic arithmetic circuit Fig -1 FULL/SEMI BREAK-IN block diagra m Fig -2 FULL/SEMI BREAK-IN timing chartControlsemi Fig -3 FULL/SEMI BREAK-IN timing char t Circuit DescriptionFig Standby keying timing char t Circuit Descriptio N PLL3 Fig PLL circuit block diagra m PLL4Unloc k Circuit Descriptio NFig Control circuit block diagra m Circuit DescriptionFig Encoder circui t Fig Encoder waveform timing chartKey scan matrix Fig Digital circuitFig A/D convertor circui t %--- 1 9 LRIT If Shift RL output 7800 port A6 Reset output 7800 port B7BZ Buzzer output 7800 port A7 MT output 8255 IC2 port A7VCO SW VCO Band information 7800 PBo 3, B3B2B1B oFig Band information generation circuit BCD DEC~ t Fig Mode control circuitControl unit X53-1450 Expand functionBZ OFF Operation procedureTES T Conditio nSW Monitor Display changes by Test numbe r SN74LS138H Control unit IC51 Rese T SE T DAT a Clock ResetTOP View AD C MB4052 Pin Descriptio n Signal Pin Function sCLK DataSN74LSI38 BPDSemiconducto R Pin connectio n Semiconducto RNF B TPD8255AC-5 Control unit IC2 SCK Semiconducto RChip capacitors Parts ListM2 General Marke T For U .S .AFor Europ e For Australi a DC Power Cord ASS Y Warranty CardWire with Conneltnr Fuse 20AACCESSNR YParts No Description Desti Ref . No AddressRP. * -g Nation 40HFR MAfN PnnhSwitch Unit PIN Connectnr CC45RHIH330J Ceramic CeramicCeram IC Cerom CCE04W Odium Elec CRO ElectrCE04WIH010M Electro CE04IAIHO Elec .1RONatio n Address New Parts No Descriptio n DestiCC45CF-II.HO50C Ceramic Cnnnect I NG WireCeramic Ooopf Elec -FRO OUFDesti- Re nation mark s Address New Parts No DescriptionDesti Nation Address New Parts No IR .gParts No Descriptio n Ref . NoDesti Re nation mark s Ceramic 56OPF New PartsCK45FIH223Z Ceramic PUL LEY ScrewRAN Hfad Machine SCR K W Prone R5004`-,0111-1220 Ceramic 6BPF CiooCeramic 1OPF CC45CHI.F-IOR5C Ceramic0107 L40EIOII-13 Small Fixed Inducto R Small Fixed Inducto RSmall Fjxed Inducto R Oscillating LOILVCO395MH7Desti Re nation marks CST Trmming POT 50V Protectio N LOUMimng POI RelayEleltpn Elellrn 47LIFOoiuf Ceramic Hinf112 AT Unit TS-440S G5 a It ,4-$ CK45FIH223Z Ceramic Ceramic OioufCC45SLIHO50C Ceramic CK45FIIJ223Z CeramicCE04WIH010M CO92M1H1O3KCE04W1HR47M CE04W H4RIMSig 1F F TS-440$ DTC114ES Digital Transistor BDF PC Board TS-440S016 C36 NilYPW M Tl .I J PLL Unit Page Page Page Page Page Page Page Page Disassembly Sems Disassembly55x2 OcDC o TS-440E/8 000- N TS-440S Packing REC Adjustmen TSpectrum Analyzer SPE-ANA AdjustmentJapanese SG American SG 25µ Detector RF Gain MAX Mode USB Stby REC Power on DC V .MMode USB Mode a MUnit Adjustmen T 5612 DI P Mode F MANT AN T VR6Stby SEN D Mode SW Power SW OFFMode USB Function SW aTOP View TP4I TP3ITP8I TP11I ITP1 Adjustment AF Output 0 .68V/811 MV AF 25mV 4.9mVInput DBu 44 FMMIC MI C If UnitRF UNI T TIF DRV=KO= Power SW on Power SW of FPS-50 AL Power for D Warranty AP BAC Power ORD AF Power CordPower Ironsinrmer Wire HAN DPower Cord Pushing NotRI1 RS14GB3A01DJJZF1OD FL---PROOF RS220V Version 240V Version Schematic Diagramipc Boar DSLP144B Specificationsiparts LIS TRS14GB3D4R7J CS15E1EO10M CS15E1VOR1M CE04W1HR22MMN6401TRA IC N IC N ICLanguag E Select Schematic DiagramPage MB-430/SP-430 WeightRatin g YK-88S/SN,YK-88C/C NIncorporated in N .S Communications & Test Equipment Grou P
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SP-430, VS-1, PS-430, AT-440, YK-88C specifications

The Kenwood MB-430, PS-50, YK-88S, YK-88CN, and YK-88SN are notable components that enhance the capabilities of Kenwood's transceiver products, particularly in the amateur radio segment. Each of these units plays an essential role in expanding functionality, improving performance, and providing users with valuable features that are beneficial in various communication scenarios.

Starting with the Kenwood MB-430, it serves as a versatile mobile bracket designed for specific Kenwood radio models. The MB-430 enhances mobility, allowing operators to mount their radios securely in vehicles or portable setups. Its sturdy construction ensures reliability during operation, and it offers a simple installation process, making it user-friendly for both beginners and seasoned enthusiasts.

The PS-50 power supply is a crucial accessory that complements Kenwood's transceiver line. This power supply is known for its compact design, providing 13.8 V DC output, which is essential for powering radios effectively. With a current rating that adequately supports various transceivers, the PS-50 is equipped with short-circuit protection and thermal overload features. These safety mechanisms protect both the power supply and the connected equipment, making it a dependable choice amongst operators.

The YK-88S, YK-88CN, and YK-88SN are all filters that enhance the performance of Kenwood transceivers. The YK-88S is a high-performance SSB filter, designed to improve the clarity of SSB signals while reducing adjacent channel interference. It offers narrow bandwidth options that facilitate more precise tuning, making it particularly valuable in crowded band conditions.

Meanwhile, the YK-88CN is known for its crystal filter technology, optimizing the transceiver's performance for CW and digital modes. This filter helps in eliminating unwanted noise, allowing operators to enjoy clearer reception and improved decoding of weak signals.

The YK-88SN, similar in function to the YK-88S and YK-88CN, provides additional narrow filtering options, enhancing the agility of transceiver operation in various modes. It effectively enhances selectivity and reduces interference from strong signals, providing a cleaner audio output.

Together, these components contribute to a seamless operating experience for amateur radio enthusiasts. Whether enhancing filter characteristics, providing reliable power, or ensuring secure mobility, the MB-430, PS-50, YK-88S, YK-88CN, and YK-88SN demonstrate Kenwood’s commitment to quality and performance in the radio communications field.
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