Tag: ZN414
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Evolution of Radio Receivers Part 5: Improving Selectivity – From IFTs to Ceramic & Crystal Filters
In this part of our series we will discuss the key component that determine the selectivity of a superhet receiver. We will compare in details single-tuned and double-tuned IFTs, and discuss the usefulness and limitations of ceramic filters. For the hobbyists, I will present two practical circuits – 1. A pocket radio with an IC…