In this paper

the tapped delay line synthetic filter is investigated analytically and experimentally

hoping that the problem of wide-band and large compression ratio can thus be solved. The paper is written in two parts. In the first part

the principle of linear frequency-modulation compression filter using delay-line synthesis is discussed. Methods to realize it and the increase in side-lobes due to differences in the amplitude-phase characteristics of the actual filter from ideal filter are investigated. The amplitude-phase characteristics of the compression filters synthesized by two different band-pass filter （one is two-stage single-tuned

the other is of sinc function） are also discussed. The effects of the amplitude weighting of band-pass filters on the amplitude-phase characteristics of the compression filter is computed. Finally

the writers come to the conclusion that nearly ideal results can be obtained by using the method of discrete weighting. In the second part

the experimental results of two compression filters constructed by two different types of band-pass filters are described. In this experiment

both active and passive methods of measurement are used

the bandwidth used is 1 MC

and the compression ratio obtained is 100.