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1.电视信号电平异常的原因剖析及对策1.1全频段信号电平偏低的原因及对策造成全频段信号电平下降的原因主要有温度变化、放大器工作异常、电缆老化、人为因素等四种原因。(1)温度变化导致电平下降及其对策:温度变化导致电平下降有两个方面的原因,第一温度降低,使电缆芯线热胀冷缩而接触不良引起电平降低。出现这种情况,低频段的电平下降比高频段的电平快,这种现象多发生于寒冷的冬季。出现这种故障必须重做接头,并紧固接
1. Analysis and Countermeasures of Abnormality of TV Signal Level 1.1 Causes and Countermeasures of Low Signal Level in Full Band There are four main reasons for the signal level drop in the whole band: temperature change, abnormal operation of the amplifier, cable aging, and human factors the reason. (1) temperature changes lead to the level of decline and countermeasures: temperature changes lead to the level of decline in two aspects, the first temperature decreases, so that the cable core thermal expansion and contraction and poor contact caused by the level of decline. When this occurs, the level of the low frequency band drops faster than that of the high frequency band, and this phenomenon occurs mostly in the cold winter. In the event of such failure, the connector must be redone and fastened