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本文主要介绍了用于比相接收机系统的两种高性能低频 LC 单边带滤波器。在所要求的通带范围内,两条滤波器输出端相位差的变化:0——79.5KC 滤波器相位差小于3°,4——76KC 滤波器即使在-50——+55℃环境温度下亦小于6°。前一种滤波器的阻带过渡很窄,40分贝阻带边界频率和3分贝通带边界频率之比近于1.01。附录中还列出了基群转接108KC 低通晶体滤波器和通路机械滤波器 LX—118的相移等实测数据。
This article describes two high-performance, low-frequency LC single-sideband filters for phase-only receiver systems. In the required passband range, the phase difference between the two filter output changes: 0--79.5KC filter phase difference is less than 3 °, 4--76KC filter even at -50 - +55 ℃ ambient temperature Under less than 6 °. The former filter has a very narrow stopband transition, and the ratio of the 40 dB stopband boundary frequency to the 3 dB passband boundary frequency is approximately 1.01. The appendix also lists the measured data of the phase shift of the 108KC low pass crystal filter and the passway mechanical filter LX-118.