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楼主 |
发表于 2017-3-25 08:40:08
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显示全部楼层
这是说明书写的
1-10. EQUIPMENT DATA
VOICE TRANSMISSION RANGE . . . . . . . . . . . . . . . . . . 4 miles using field wire WD-1/TT (approximate)
SIGNAL RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 miles using field wire WD-1/TT (approximate)
FREQUENCY RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 to 4000 Hz
SIGNAL VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to 80 Vac at 20 Hz
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