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Alinco Dr-135 Service Manual

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    Page 1 DR-135 Service Manual CONTENTS SPECIFICATIONS 1) GENERAL ................................................................ 2 2) TRANSMITTER ........................................................ 2 3) RECEIVER ............................................................... 2 CIRCUIT DESCRIPTION DR-135 1) Receiver System .................................................. 3, 4 2) Transmitter System ............................................... 4, 5 3) PLL Synthesizer Circuit...
    Page 2 2 SPECIFICATIONS 1) GENERAL Frequency coverage DR-135T, TG (U.S amature) 118.000 ~ 135.995MHz (AM RX) 136.000 ~ 173.995MHz (RX) 144.000 ~ 147.995MHz (TX) DR-135E, EG (European amature) 144.000 ~ 145.995MHz (RX, TX) DR-135TA, TAG (Commercial) 118.000 ~ 135.995MHz (AM RX) 136.000 ~ 173.995MHz (RX, TX) Operating mode 16K0F3E (Wide mode) 8K50F3E (Narrow mode) Frequency resolution 5, 8.33, 10, 12.5, 15, 20, 25, 30, 50 Number of memory channels 100 Antenna impedance 50Ω unbalanced Power requirement 13.8V DC...
    Page 3 3 CIRCUIT DESCRIPTION DR-135 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 received signal at any frequency in the 136.000MHz to 173.995MHz range is passed through the low-pass filter (L116, L115, L114, L113, C204, C203, C202, C216 and C215) and tuning circuit (L105, L104 and D105, D104), and amplified by the RF amplifier (Q107). The signal from Q107 is then passed through the tuning circuit (L103, L102, and...
    Page 4 4 5. Squelch Circuit The detected output which is outputted from the pin 12 of IC108 is inputted to pin 19 of IC108 after it was been amplified by IC104:A and it is outputted from pin 20 after the noise component was been eliminated from the composed band pass filter in the built in amplifier of the IC, then the signal is rectified by D106 to convert into DC component. The adjusted voltage level at VR101 is delivered to the comparator of the CPU. The voltage is led to pin 2 of CPU and compared with the...
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