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卫星地面站设备之一——70MHz 中频滤波器,除满足幅频特性技术指标外,因中频滤波器本身具有较大时延特性,必需外加时延均衡器来均衡,以满足规定技术指标。本文介绍的是预先采用简易、直观的时延曲线样板法设计,初步得到时延均衡器参数作为初值,并将初值进一步用最优化理论——最小二乘法,由微型计算机选择时延均衡器最佳参数。最后,计算出均衡器元件值、各节时延曲线时间,按照时延曲线时间作为样板进行调测。例举带宽为17.5MHz 中频滤波器时延均衡器设计,列出本程序框图,采用 BASIC 语言和 TP803微型计算机,上机通过。一、时延曲线样板法设计(一)70MHz 中频滤波器时延曲线的要求先将中频滤波器在微波扫频仪上调测,满足了幅频特性技术指标外,在通带上、下两边频处具有较大时延峰,即具有高低两个时延峰。一般低频端时延峰稍大于高频端时延峰,要求通频带内时延曲线对70MHz
One of the satellite ground station equipment - 70MHz IF filter, in addition to meet the amplitude and frequency characteristics of technical indicators, the IF filter itself has a large delay characteristics, plus delay equalizer to equalize to meet the specified technical indicators. This article describes the pre-use of simple and intuitive model of time-delay curve design, the initial delay equalizer parameters as an initial value, and the initial value further optimization theory - least squares, the microcomputer selected delay equalization The best parameters of the device. Finally, calculate the equalizer component values, the time delay curve of each section, in accordance with the delay curve time as a template for commissioning. Example bandwidth of 17.5MHz IF filter delay equalizer design, listing the block diagram, using BASIC language and TP803 microcomputer, on the machine through. First, the delay curve model design (A) 70MHz IF filter delay curve requirements First IF filter on the microwave swept frequency analyzer to meet the amplitude and frequency characteristics of technical indicators, the pass band, the next two frequency Office has a larger delay peak, which has two high and low delay peak. Generally low-frequency terminal delay peak slightly larger than the high-frequency terminal delay peak, requiring the passband delay curve of 70MHz