Kenwood YK-88C, PS-50, SP-430, PS-430, MB-430, AT-440, VS-1 Fig PLL circuit block diagra m PLL4, PLL3

Page 16

TS-440S

CIRCUIT DESCRIPTION

VCO I A 45 .08. . 52 .55 MHz

852 .55 ... 59 .55 MH z C 59 .55 . . 67 .05MH z D 67.05 ., . 75 .05MHz

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Fig . 12 PLL circuit block diagra m

•PLL4

PLL4 consists of IC1 (MN6147) and its associated loo p circuit . VC04, Q3 (2SC2668), is locked at a frequenc y of aproximately 91 MHz, which differs depending on th e operational mode . The 9 MHz reference frequency is ap- plied to pin 3 of ICI, where the signal is divided by 180 0 to generated the 5 kHz signal for frequency comparison . The output of VC04 is supplied to IC1 pin 16 via buffe r amplifier Q4 (2SC2668) . In ICI, the output is divided b y an appropriate division ratio (18200 or so) which differ s depending on the mode . The phase of the signal is com- pared with that of the 5 kHz reference signal by the phas e comparator and the VC04 oscillation frequency is locked . Frequency division data is sent from the digital unit (DA O to DA3 and CK3) .

The output from PLL4 goes through buffer amplifier Q 5 (2SC2668) and is divided by 20 in IC2 (M54459L( . Th e signal is further divided by ten in the carrier circuit of IC 3 (SN74LS90N) and then fed into the IF unit as the carrie r signal via the LPF, and buffer Q7 (2SC2458) and Q 8 (2SC 1959) . In AM or FM receive mode, switching circui t Q6 (2SC2458) operates when an SFT signal is sent, an d as a result, IC3, Q7, and Q8 are stopped to cut carrie r signals .

The PLL4 output signal also goes through the LPF an d buffer amplifier Q9 (2SC2458) and is fed into the mixe r in the main loop, where the signal is used to form the dig - ital VFO signal . As a result, the operating frequency doe s not change even if the carrier frequency is changed, whic h enables USB and LSB mode switching IF shift and fine car -

rier point adjustment . In SSB, CW, or FSK reception mode , the may be shifted +/– 1 kHz or more and the carrie r point can be adjusted in the range from – 400 Hz to + 35 0 Hz .

•PLL3

PLL3 consists of IC4 (MN6147) and its associated loo p components . VCO3, Q12 (2SC2668), is locked in th e range of 99 MHz to 103 .995 MHz . The 9 MHz referenc e frequency signal is supplied to pin 3 of IC4, where the sig - nal is divided by 1800 to generate the 5 kHz signal fo r frequency comparison . The output of VCO3 goes throug h buffer amplifier Q13 (2SC2668) and is applied to IC4 pi n 16 . In IC4, the output is divided by L and the phase o f the signal is compared with that of the 5 kHz referenc e signal by the frequency comparator, and VCO3 oscillatio n frequency is locked (in 5 kHz steps) . The division ratio , L, is supplied by the microprocessor, in the digital unit , (DAO to DA3 and CK2) . L is in 1000 steps (19800 t o 20799) corresponding to 0 .00 kHz to 9 .99 kHz . In C W receive, in order to obtain 800 Hz beat signals in the oper - ation frequency display, the L is shifted -80 (19720 t o 20719) and when RIT/XIT operates, the Lis changed s o that fvco is shifted +1– 1 .2 kHz or more . In AM or F M mode, the L is shifted by 10 steps to change fvco by 10 0 Hz steps .

Output from PLL 3 goes through buffer amplifier Q1 4 (2SC2668) and it is divided by ten in IC5 (M54460L) an d then by five in IC6 (SN74LS90N) . The signal is then fe d

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Contents KEN Wood Semiconductors Dimensions TS-440SSensitivity Image ratio If rejection SelectivityFrequency accuracy RIT/XIT OFF Frequency stabilityFig Frequency configuratio n Circuit Descriptio N IpllFig Receiver circuit configuratio n USB, LSB, FS KAM, FM Displayed frequencie sCircuit Description Fig Selectivity control circuitMCF L71-0259-05 RF Unit Fl Filter selectiveCeramic filter L72-0355-05 if Unit CF2 Circuit Descriptio N BX7I91- 851BX719 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 Fig PLL circuit block diagra m PLL4 PLL3Circuit Descriptio N Unloc kCircuit Description Fig Control circuit block diagra mFig Encoder waveform timing chart Fig Encoder circui tFig Digital circuit Key scan matrixFig A/D convertor circui t %--- 1 9 LRIT If Shift Reset output 7800 port B7 RL output 7800 port A6BZ Buzzer output 7800 port A7 MT output 8255 IC2 port A7Band information 7800 PBo 3, B3B2B1B o VCO SW VCOFig Band information generation circuit BCD DECFig Mode control circuit ~ tControl unit X53-1450 Expand functionOperation procedure BZ OFFTES T Conditio nSW Monitor Display changes by Test numbe r SN74LS138H Control unit IC51 Rese T SE T DAT a Clock ResetTOP View MB4052 Pin Descriptio n Signal Pin Function s AD CCLK DataBPD SN74LSI38Semiconducto R Pin connectio n Semiconducto RNF B TPD8255AC-5 Control unit IC2 Semiconducto R SCKParts List Chip capacitorsM2 General Marke T For U .S .AFor Europ e For Australi a Warranty Card DC Power Cord ASS YWire with Conneltnr Fuse 20AACCESSNR YRef . No Address Parts No Description DestiRP. * -g Nation 40HFR MAfN PnnhSwitch Unit PIN Connectnr Ceramic CC45RHIH330J CeramicCeram IC Cerom CElectr CE04W Odium Elec CROCE04WIH010M Electro CE04IAIHO Elec .1ROAddress New Parts No Descriptio n Desti Natio nCnnnect I NG Wire CC45CF-II.HO50C CeramicCeramic Ooopf Elec -FRO OUFAddress New Parts No Description Desti- Re nation mark sAddress New Parts No IR .g Desti NationParts No Descriptio n Ref . NoDesti Re nation mark s New Parts Ceramic 56OPFCK45FIH223Z Ceramic Screw PUL LEYRAN Hfad Machine SCR K W Prone R5004`-,0111-1220 Cioo Ceramic 6BPFCeramic 1OPF CC45CHI.F-IOR5C Ceramic0107 Small Fixed Inducto R L40EIOII-13 Small Fixed Inducto RSmall Fjxed Inducto R Oscillating LOILVCO395MH7Desti Re nation marks CST LOU Trmming POT 50V Protectio NMimng POI RelayElellrn 47LIF EleltpnOoiuf Ceramic Hinf112 AT Unit TS-440S G5 a It ,4-$ Ceramic Oiouf CK45FIH223Z CeramicCC45SLIHO50C Ceramic CK45FIIJ223Z CeramicCO92M1H1O3K CE04WIH010MCE04W1HR47M CE04W H4RIMSig 1F F TS-440$ DTC114ES Digital Transistor PC Board TS-440S BDF016 C36 NilYPW M Tl .I J PLL Unit Page Page Page Page Page Page Page Page Disassembly Disassembly Sems55x2 OcDC o TS-440E/8 000- N TS-440S Packing Adjustmen T RECSpectrum Analyzer SPE-ANA AdjustmentJapanese SG American SG 25µ Detector Power on DC V .M RF Gain MAX Mode USB Stby RECMode USB Mode a MUnit Adjustmen T 5612 Mode F M DI PANT AN T VR6Stby SEN D Power SW OFF Mode SWMode USB Function SW aTOP View TP4I TP3ITP8I TP11I ITP1 Adjustment MV AF 25mV 4.9mV AF Output 0 .68V/811Input DBu 44 FMIf Unit MIC MI CRF UNI T TIF DRV=KO= Power SW of F Power SW onPS-50 Warranty AP B AL Power for DAC Power ORD AF Power CordWire HAN D Power IronsinrmerPower Cord Pushing NotRS14GB3A01DJ RI1JZF1OD FL---PROOF RSSchematic Diagramipc Boar D 220V Version 240V VersionSLP144B Specificationsiparts LIS TRS14GB3D4R7J CE04W1HR22M CS15E1EO10M CS15E1VOR1MMN6401TRA IC N IC N ICSchematic Diagram Languag E SelectPage Weight MB-430/SP-430YK-88S/SN,YK-88C/C N Ratin gCommunications & Test Equipment Grou P Incorporated in N .S
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Manual 4 pages 53.32 Kb

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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