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Q.應用在DTV監控系統的光發射機的輸出功率大致要選多少？
Q.應用在DTV監控系統的光發射機的輸出功率大致要選多少？
應用在DTV監控系統的光發射機的輸出功率大致要選多少？
這個問題和使用的情境有關，如果傳輸距離在數公里到十數公里的範圍，0dBm上下的光發射機應該是足夠。
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