| 摘要 |
PURPOSE:To simply make the detection of reception level, by providing a display device which displays the reception of carrier simply and another display device which displays that the level of carrier is sufficient to receive the data. CONSTITUTION:The reception level of the carrier signal is checked with carrier detectors CD1, CD2. When the carrier level attenuated at an attenuator ATT is in excess of the threshold level of a carrier detector CD2, it naturally exceeds the threshold level of the carrier detector CD1, not giving any disadvantage to the reception. But, if the reception signal does not exceed the threshold level at the carrier detector CD2 and the lamp CDL2 does not illuminate, it is judged as the decrease in the reception level. |
