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我们台处在远离电视发射台几百公里的高山上,以前用一部高2m,宽0.8m的黑白电视收转机来接收远方电视台传来的电视信号,这种收转机需采用人工控制信号的强弱来调整图象电平才能获得比较清晰的图象。这样做往往容易产生过调和负象,并且只能接收固定频道。在长期的实践中,我们装制了一种视频放大器,这种放大器和电视机共用一个电源.并且采用电视机本身的自动增益控制,解决了不产生负象和达到图象稳定的效果,同时减轻了值班人员的劳动强度。由于它不需要单独的电源,大大节省了电能。对暂时没有微波传送装置的电视台,可以用一台九英寸的黑白电视机(彩色电视
Our station at a distance of a few hundred kilometers from the TV launch pad in the mountains, before using a 2m high and 0.8m wide black and white TV receiver to receive television signals from distant television stations, which take the machine control signal Strength to adjust the image level to get a clearer image. This tends to produce overharmonics and can only receive fixed channels. In the long-term practice, we have assembled a video amplifier that shares a power supply with the television and uses the automatic gain control of the television to solve the problem of no negative effects and image stabilization, and at the same time Reduce the labor intensity on duty. Because it does not require a separate power supply, significant savings in power. For a television station that does not have a microwave transmission temporarily, a nine-inch black and white TV set (color TV