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kenwood - Ts-2000 2000x - Service Manual - ts-2000/x 68.985mhz 75.825mhz tx mix tx mix tx mix tx mix...

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  • 2000-12 PRINTED IN JAPANB51-8558-00 (N) 889

    ALL MODE MULTI-BAND TRANSCEIVER

    TS-2000/XSERVICE MANUAL

    CIRCUIT DESCRIPTION ............................. 2

    DESCRIPTION OF COMPONENTS ......... 24

    SEMICONDUCTOR DATA ....................... 34

    PARTS LIST .............................................. 51

    EXPLODED VIEW..................................... 93

    PACKING .................................................. 97

    ADJUSTMENT ......................................... 98

    TERMINAL FUNCTION .......................... 124

    WIRING.................................................. 133

    PC BOARD VIEWS / CIRCUIT DIAGRAMS

    FILTER UNIT (X51-315X-XX) ............. 135

    FINAL UNIT (X45-360X-XX) .............. 137

    DISPLAY UNIT (X54-3320-00) ........... 151

    CONTROL UNIT (X53-391X-XX) ....... 155

    TX-RX 1 UNIT (X57-605X-XX)........... 169

    TX-RX 2 UNIT (X57-606X-XX)........... 186

    TX-RX 3 UNIT (X57-6070-00) ............ 209

    BLOCK DIAGRAM .................................. 223

    LEVEL DIAGRAM ................................... 229

    MC-52DM ............................................... 233

    UT-20 ..................................................... 235

    RC-2000 ................................................. 235

    ARCP-2000 ............................................ 235

    SPECIFICATIONS ................................... 236

    Knob(K21-1104-03)

    Knob ring(K29-5395-04)

    Knob(K29-5397-13) x 2

    Knob(K29-5398-03) x 3

    Knob(K29-5399-03) x 3

    Knob(K29-5396-03) x 2

    Key top(K29-5391-02)

    Key top(K29-5393-12)

    Key top(K29-5394-12)

    Key top(K29-5392-12)

    Front glass(B10-2608-02)

    Cabinet (Upper)(A01-2176-01)

    Foot(J02-0442-04) x 2

    Foot(J02-0440-04)

    RF coaxial receptacle (Round)(E06-0858-15)

    Phone jack (9P)(E11-0438-05)

    CONTENTS

  • 2

    TS-2000/X

    Overview of the OperationThe TS-2000/X basically consists of an all-mode-receiver

    incorporating an IF/AF DSP for satellite communication withan independent FM/AM sub-receiver for the VHF and UHFbands.

    Overview of the operation of the all-mode trans-ceiver unit (main band side) with an IF/AF DSPfor satellite communicationThe receiver unit has an independent front end for each

    of the HF, 50MHz, 144MHz, 430MHz and 1.2GHz bands(some products do not support the 1.2GHz band). The cir-cuits following the 10.695MHz IF stage are common to allthe bands. (Thus, it cannot receive two SSB signals at thesame time.)

    The IF frequency of the transmitter unit is shifted fromthe IF frequency of the receiver unit by 100kHz to enablesatellite operation (full duplex operation). The final section isindependent of the HF, 50MHz, 144MHz, 430MHz and1.2GHz bands. Consequently, you can select a combinationof bands permitting satellite communication from the HF,50MHz, 144MHz, 430MHz and 1.2GHz bands.

    The transmitter unit and receiver unit on the main bandside operate simultaneously during satellite transmission.The receiver unit on the sub-band side does not work. (Thesub-band receiver is not used during satellite operation.)

    Two 16-bit DSP ICs are used; one performs IF processing(main band side) and the other carries out AF processing(main and sub bands). Although the DSP IC is a 16-bit unit, itcarries out double-precision operations for critical parts ofIF processing to perform 32-bit equivalent processing. Inaddition, the DSP IC uses a 100-MHz high-speed internalclock. The conversion from an analog signal to a digital sig-nal (A/D conversion) is performed with 24 bits at high preci-sion.

    The DSP circuit for IF operates in any mode other thanFM mode for both transmission and reception. FM modula-tion, detection and squelch processing are conventional ana-log processes. (The processing prior to modulation and af-ter demodulation in FM is performed by the DSP.)

    In the mode in which the IF DSP circuit operates, it car-ries out modulation and demodulation, digital IF filtering,digital AGC, and CW waveform processing during transmis-sion, as in the TS-870. All these functions are operated in allthe bands on the main band side, including satellite opera-tion.

    The AF unit is processed by the DSP in all modes. Theoperating range of the DSP circuit depends on the mode,but it performs beat cancellation, noise reduction, AF DSPfiltering, etc.

    Overview of the operation of the independentFM/AM sub-receiver unit (sub-band side) for theVHF and UHF bandsThe local oscillator system and IF/AF signal system of the

    sub-receiver unit are independent of the main band side.Therefore, the sub-band receiver can receive signals whilethe main band receiver is sending a signal. (Except whenreception is impossible due to harmonics of the transmit fre-quency and when the main band and sub-band are on thesame frequency band.)

    The sub-band receive signal is branched from the RF uniton the main band side. It is, therefore, not necessary toinstall a dedicated antenna for sub-band reception.

    Transmission can be performed with the sub receive fre-quency by shifting the PTT band to the sub-band side. Itis made possible by internally using the transmission func-tion on the main band side.

    AF processing is also carried out by the DSP on the sub-band side and the noise reduction function works.

    The sub-band reception function, including display, canbe turned off.

    Frequency Configuration (Fig. 1)This transceiver utilizes double conversion in FM mode

    and triple conversion in non-FM modes during transmission.It utilizes triple conversion in FM mode and quadruple

    conversion in non-FM modes during reception. The fourth12kHz IF signal is converted from analog to digital and con-nected to the DSP.

    When the carrier point frequency of the signal input fromthe antenna is fIN, the relationship between these signalswhen demodulating this signal is expressed by the followingequations:

    HF MAIN fIN = fLO1 fLO2 fLO3 + fLO4 12kHzVHF MAIN fIN = fLO1 fLO2 fLO3 + fLO4 12kHzUHF MAIN fIN = fLO1 + fLO2 + fLO3 fLO4 + 12kHz1.2G MAIN fIN = fLO1 x 2 + fLO2 + fLO3 fLO4 + 12kHz

    Reference Signal Generation CircuitThe 15.6MHz reference frequency fstd for PLL frequency

    control is generated by the TCXO (X400). The signal passesthrough a buffer amplifier (Q420) and is used as the refer-ence signal for the second local oscillator (HFLO2) for HFband reception and the first local oscillator (SLO1) subbandreception.

    The reference signal is doubled by Q412, and the result-ing 31.2MHz signal is used as the reference signal for DDSs(IC406, IC407, IC408, IC601, IC602, IC603).

    The 31.2MHz signal is supplied to the TX-RX2 unit (X57-606 A/11) as LO2 for VHF and UHF bands.

    CIRCUIT DESCRIPTION

  • 3

    TS-2000/X

    68.985MHz

    75.825MHz

    TX MIX

    TX MIX TX MIX

    TX MIX TX MIX

    69.085MHz10.695MHz

    10.595MHz

    75.925MHz

    RX MIX RX MIX RX MIX DET

    TCAR10.583MHz

    455kHz

    LO311.150MHz

    LO1HF75.955~

    129.085MHz

    LO258.390~

    65.230MHz

    RCAR467kHz

    41.795MHz

    LO1TX183.795~418.205MHz (K)185.795~398.205MHz (E)

    RX MIX RX MIX41.895MHz

    SUBRX MIX 58.525MHz

    LO1RX183.895~418.105MHz (K)185.895~398.105MHz (E)

    SLO258.070MHz

    TX MIX TX MIX135.395MHz

    RX MIX RX MIX135.495MHz

    1.2GLO11104~1165MHz

    LO3131.2MHz

    MixerIF detector

    2

    SLO1322.95~465.04MHz (K)371.475~409.050MHz (E)

    HF/50MHz

    UHFVHF

    1.2G

    1.2GLO2124.8MHz

    DSP

    MICinput

    AFoutput

    HF/50MHz LO1When the HF and or 50MHz band is operating in the main

    band, the HF REF VCO (Q427) generates 31.17 to 32.834MHz. (See Table 1, frequency configuration.)

    The output signal from the DDS (IC408) is input to pin 8of the PLL IC (IC409) for HF REF, divided into 1/16 in IC409to produce comparison frequency f 2 of 487 to 513kHz.

    The output signal from the VCO (Q427) goes to pin 6 ofPLL IC (IC409), is divided into 1/64 in IC409, and comparedwith the signal with comparison frequency f 2 by a phasecomparator. The frequency is locked and the HF REF signalis output.

    The output signal from the PLL IC (IC409) for HF REF isfed to pin 8 of the PLL IC (IC414) for HF LO1 as a referencefrequency, and divided to produce comparison frequencyf 1 of 975 to 1358kHz.

    The HF LO1 VCO (Q459, Q460, Q464) generates 75.955to 129.185MHz. The output from this VCO goes to pin 6 ofIC414, is divided into 1/N 1 in IC414, compared with the sig-

    nal with comparison frequency f 1 by a phase comparator.The frequency is locked and the HF LO1 output frequency isgenerated.

    The DDS (IC408) sweeps output frequency (7.792 to8.209MHz) in 10Hz steps by equation fDDS STEP (Hz) =(10*R 1)/(N 1*4) and in 1Hz steps by equation fDDS STEP(Hz) = (1*R 1)/(N 1*4), the HF LO1 covers the frequenciesof 75.955 to 129.085MHz in 10Hz or 1Hz steps.

    One of three VCOs (Q459, Q460, Q464) is selected bythe signal (HF VCO1,HF VCO2,HF VCO3) from the serial-par-allel IC (IC404).

    The output from the VCOs (Q459, Q460, Q464) passesthrough a buffer amplifier (Q462), is amplified by Q476, andpasses through a low-pass filter. The impedance is con-verted by an attenuator and the signal is output as HFLO1.

    The cut-off frequency of the low-pass filter in the outputsection is changed by turning Q474 ON/OFF with a VCO se-lect signal (HF VCO1).

    Fig. 1 Frequency configuration

    CIRCUIT DESCRIPTION

  • 4

    TS-2000/X

    HF LO2When the HF and or 50MHz band is operating, the

    HF LO2 VCO (Q409) generates 65.230 to 58.390MHz. (SeeTable 1, frequency configuration.)

    The 15.6MHz reference signal fstd is input to pin 8 of thePLL IC