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Alinco Dj-296t Circuit Description Manual

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    Page 1 CIRCUIT DESCRIPTION DJ-296T 1) Receiver System The receiver system is a double superheterodyne system with a 30.85 MHz first IF and a 455 kHz second IF. 1. Front End The received signal at any frequency in the 216.00 to 249.995 MHz range is passed through the low-pass filter (L2, L3, L8, C2, C9, C10, C11, C62 and C189), high-pass filter (C56, C57, C58, C61, L22, L25 and D15), and amplified by the RF amplifier (Q9). The signal from Q9 is then passed through the tuning circuit (C12, C14, C65, C66,...
    Page 2 ADJUSTMENT DJ296T 1) Required Test Equipment The following items are required to adjust radio parameters: 1. Regulated power supply Supply voltage: 5 - 14 VDC Current: 3A or more 2. Digital multimeter Voltage range: FS = Approx. 20V Current: 10A or more Input resistance: High impedance 3. Oscilloscope Measurable frequency: Audio frequency 4. Audio dummy...
    Page 3 • All SSG outputs are indicated by EMF. • Supply voltage for the transceiver: 13.8VDC 2) Adjustment Mode The DJ-296 does not require a serviceperson to manipulate the components on the printed-circuit board, except the trimmer when adjusting reference frequency and deviation. Most of the adjustments for the transceiver are made by using the keys on it while the unit is in the adjustment mode. Because the adjustment mode temporarily uses the channels, frequency must be set on each channel...
    Page 4 Reference Frequency Adjustment 1. In the adjustment mode, select channel 1 by rotating the main tuning dial. 2. Press the PTT key to start transmission. 3. Rotate TC1 on the Main board until the value on the frequency counter matches the one displayed on the LCD. High Power Adjustment 1. In the adjustment mode, select channel 2 by rotating the main tuning dial. ( “L” at the upper-left of the display disappears). 2. Hold down the PTT key to start transmission. 3. While watching the reading of...
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