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本文针对高电平高频调制的老制式的黑白电视发射机所存在的严重缺陷,提出了利用性能好的单通道低电平中频调制的新制式及节能效果好的“黑灯丝”技术等多项综合技术手段对旧机进行系统地全面改造,使改造后的彩色电视发射机图像伴音技术指标及实际收看效果远胜于旧机水平,而且经济效益显著。本文具体介绍了改机方案,元器件选择,“黑灯丝”技术应用,主要技术指标和实际应用效果。
In this paper, aiming at the serious defects of the old-style black-and-white TV transmitters with high-level and high-frequency modulation, a new single channel low-frequency IF modulation system and a “black filament” technology with good energy- And many other comprehensive technical means to systematically and comprehensively transform the old machine so that the technical indicators of the modified color TV transmitter audio-visual and the actual viewing results far better than the old machine level, and significant economic benefits. This article specifically describes the change program, component selection, “black filament ” technology applications, the main technical indicators and practical application results.