Alinco Dj-296t Circuit Description Manual
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de-emphasis circuit (R106, R107, C127 and C128) and amplified by the AF amplifier (Q27). The signal is then input to pin 2 of the electronic volume (IC6) for volume adjustment, and output from pin 1. The adjusted signal is sent to the audio power amplifier (IC5) through pin 2 to drive the speaker. 2) Transmitter System 1. Modulator Circuit The audio signal is converted to an electric signal in either the internal or external microphone, and input to the microphone amplifier (IC8). IC8...
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frequency of 5 or 6.25 kHz. 2. Reference Frequency Circuit The reference frequency appropriate for the channel steps is obtained by dividing the 12.8 MHz reference oscillation (X1) by 2048 or 2560, according to the data from the CPU (IC9). When the resulting frequency is 5 kHz, channel steps of 5, 10, 15, 20, 25, 30 and 50 kHz are used. When it is 6.25 kHz, the 12.5 kHz channel step is used. 3. Phase Comparator Circuit The PLL (IC1) uses the reference frequency, 5 or 6.25kHz. The phase comparator...
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“H” level reset signal is output form the reset IC (IC11) to pin 33 of the CPU (IC9), causing the CPU to reset. The reset signal, however, waits at 100, and does not enter the CPU until the CPU clock (X3) has stabilized. 4. S (Signal) Meter Circuit The DC potential of pin 8 of IC5 is input to pin 1 of the CPU (IC9), converted from an analog to a digital signal, and displayed as the S-meter signal on the LCD. 5. DTMF Encoder The CPU (IC9) is equipped with an internal DTMF encoder. The DTMF signal is...