Chapter7.18
FM Combining and Filter System Design
There have been many changes in the applications for filters, in today’s transmission facilities, in order to keep up with the ever-increasingly crowded FM spectrum. An ideal filter response curve looks like a perfect square wave as shown in Figure 7.18-10. Figure 7.18-47 shows a typical response when cross-coupling loops are added to a bandpass filter. The good news is with today’s computer programs and experienced technicians, while that elusive square wave has not been achieved, it is getting closer and closer every year. In general, these larger and faster computers are still using the same basic filter concepts in use since the early ...
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