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1.欧洲调频电视规划采用的技术标准1.1 最低可用场强最低可用场强是指在有自然噪扰、人为噪扰而没有其它发射机干扰的场合,在规定的条件下使接收效果满意所必需的场强最小值.这个值是通过主观评价和实际测量确定的.早些时侯主观评价认为可按收的质量等级是3.5分,现在规定为3分.实际测量考虑了接收机在规定的输入阻抗、噪声指数,同时计入了接收天线增益和馈线损耗后,以达到某一信号噪声比时的最小输入电平折算
1. Technical Specifications for European FM Television Planning 1.1 Lowest Available Field Strength The lowest available field strength is required for satisfactory reception under specified conditions where there is natural or artificial noise and no other transmitter interference The minimum value of the field strength.This value is determined by subjective evaluation and actual measurement.More subjective evaluation that the quality of the receivable quality rating is 3.5 points, now the provisions of 3. The actual measurement takes into account the receiver in the specified Input impedance, noise figure, while taking into account the receiving antenna gain and feeder loss, to achieve a signal-to-noise ratio of the minimum input level conversion