KENWOOD UBZ-LJ8 free download

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FM TRANSCEIVER UBZ-LJ8 SERVICE MANUAL © 2002-12 PRINTED IN JAPAN B51-8644-00 (N) 506 Cap (SP/MIC) (B09-0673-03) Knob (VOL) (K29-9258-03) CONTENTS CIRCUIT DESCRIPTION ... 2 COMPONENTS DESCRIPTION ... 7 TERMINAL FUNCTION ... 7 SEMICONDUCTOR DATA ... 8 PARTS LIST ... 9 EXPLODED VIEW ... 13 PACKING ... 14 ADJUSTMENT ... 15 PC BOARD TX-RX UNIT (X57-6672-70) (A/2) ... 20 TX-RX UNIT (X57-6672-70) (B/2) ... 24 SCHEMATIC DIAGRAM ... 26 BLOCK DIAGRAM ... 30 LEVEL DIAGRAM ... 32 UBC-4 (BATTERY CHARGER) ... 33 UPB-1 (BATTERY PACK) ... 33 SPECIFICATIONS ... BACK COVER Antenna (T90-1016-05) Front glass (B10-2742-03) : B (B10-2748-03) : SL,Y Button knob (PTT) (K29-9257-03) Key top (4 keys) (K29-9256-02) Cabinet assy (Front) (A02-3794-03) : B (A02-3795-03) : Y (A02-3796-03) : SL B : Black Y : Yellow SL : Silver UBZ-LJ8 CIRCUIT DESCRIPTION Frequency Configuration ANT Simplex 446.00625~446.09375MHz LPF BPF 446MHz ANT SW RF AMP Simplex 424.30625~ 424.39375MHz RF AMP RF AMP RF AMP 1st MIX 21.7MHz MCF MIX, IF DET AF AMP SP ANT 3T 3R D8 LPF L32 L31 Q9 21.25MHz MIC PLL VCO MIC AMP 21.25MHz 1st local OSC VCO Q10 3R D10 XF1 FM IC Q11 Simplex 446.00625~ 446.09375MHz 3R TCXO Fig. 3 Receiver front end and Mixer circuit Fig. 1 Frequency configuration Reception method Double super heterodyne 1st IF frequency 2nd IF frequency Transmission method Modulation 21.7MHz (Lower) 450kHz (Lower) Item Nominal center frequency (fo) Pass bandwidth Attenuation bandwidth Ripple Insertion loss Ultimate attenuation 21.7MHz ± 3.75kHz or more at 3dB ± 14kHz or less at 40dB 1dB or less 3.5dB or less 80dB or more (fo ± 910kHz) 40dB or more (fo ± 1MHz) 850± 5% // 5pF± 0.5pF Rating VCO direct amplification Variable reactance phase modulation Table 1 Receiver System Front End The high-frequency signal received from antenna passes through a LPF (Low pass filter : components between ANT and C73) to filter out unwanted high frequency signal. A switch diode system (D8, L32 and D10) allows this signal to pass through and enters the BPF (Band pass filter : L31) to eliminate unwanted signal when receiving. The resulting signal is amplified by high-frequency amplifier (Q9) and goes to the first mixer (Q10). Spurious responses Terminating impedance Table 2 MCF (L71-0616-05) : TX-RX Unit XF1 Item Rating 450kHz ± 4.5kHz or more ± 10kHz or less 3dB or less 40dB or more 4dB or less 2.0k± 10% Nominal center frequency (fo) 6dB bandwidth 50dB bandwidth Ripple (450kHz ± 3kHz) Guaranteed attenuation (± 100kHz) Insertion loss I/O matching impedance First Mixer The amplified signal that reaches Q10 is