![4-5-2 D/A CONVERTOR IC (MAIN UNIT: IC5)](/images/new-backgrounds/17577/1757721x1.webp)
4-5-2 D/A CONVERTOR IC (MAIN UNIT: IC5)
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2 | MOD | Outputs transmit devetion control sig- | |
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3 | SQLATT | Outputs attenuator control signal. | |
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| • Outputs tunable bandpass filter con- | |
10 | T1 | trol signal while receiving. | |
• Outputs TX power control signal | |||
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| while transmitting. | |
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11, 23 | T2, T3 | Output tunable bandpass filter control | |
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14 | SQLIN | Outputs squelch control signal. | |
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15 | DTC | Outputs DTCS’s gradient control sig- | |
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22 | FC | Outputs reference frequency control | |
signal to X1. | |||
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4-5-3 I/O EXPANDER IC (MAIN UNIT: IC2)
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| Outputs cooling fan control signal. | ||||||
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| The fan speed is depended as shown | ||||||
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4 | FANC1 |
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7 | FANC |
| Fan speed | FANC | FANC1 |
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12 | FANC2 |
| Hi | H | H |
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| Middle | H | L |
| H |
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| Low | H | H |
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6 | AFMUTE |
| Outputs AF mute circuit control signal. | ||||||
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| High : While AF mute is ON. |
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| Outputs TX and RX VCO’s regulator | ||||||
11 | SHIFT |
| control signals. |
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| High | : While receiving. |
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| Low | : While transmitting. |
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13 | RXC |
| Outputs R5 regulator control signal. | ||||||
| Low | : While receiving. |
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14 | TXC |
| Outputs TX power control signal. | ||||||
| High : While transmitting. |
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