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Alinco DJ-S40T/E Service Manual

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    Page 1 DJ-S40T / E Service Manual CONTENTS SPECIFICATIONS 1) GENERAL................................................................ 2 2) TRANSMITTER........................................................ 2 3) RECEIVER............................................................... 2 CIRCUIT DESCRIPTION 1) Receiver system ....................................................... 3 2) Terminalmitter system............................................... 4 3) PLL, VCO...
    Page 2 2 SPECIFICATIONS 1) GENERAL Frequency coverage T : TX 430 ~ 449.995MHz RX 410 ~ 470MHz E : TX 430 ~ 439.995MHz RX 430 ~ 439.995MHz TA : TX 410 ~ 470MHz RX 410 ~ 470MHz Mode F3E (FM) Channel steps 5, 10, 12.5, 15, 20, 25, 30 & 50kHz Memory channels 99 channels+1 CALL channel Antenna connector SMA (50Ω unbalanced) Frequency stability ±5 ppm Microphone impedance 2kΩ nominal Power supply 4.5 ~ 16.0V DC (EXT.termonai) 3.6 ~ 16.0V DC (BATT terminal) Current 600mA (typical) Transmit high at 1W 150mA...
    Page 3 3 CIRCUIT DESCRIPTION 1) Receiver System The receiver system is a double superheterodyne system with a 21.7MHz first IF and a 450kHz second IF. 1. Front End The signal from the anntena is pssed through low-pass filter and input to RF coil L24 and L17(band pass filter). The signal from L24 and L17 is amplified by Q9,Q10 and led to the band pass filter, and let to the first mixer base of Q11. 2. First Mixer The amplified signal (f0) by Q9,Q10 is mixed eith the first local...
    Page 4 4 2)Transmitter System 1.Microphone Amplifier The input signal from built-in or external microphone is led to the microphone mute circuit Q15,pre-emphasis circuit ,IDC circuit IC4,the signal is input to the maximum deviation adjustment volume VR2.Then mixed at the add VR2 with the CTCSS tone signal which is generated by CPU,Then it is input to VCO as the modulation signal. 2.Power Amplifier The signal from VCO is amplified by IC1 and then passed through the low-pass...
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