Tag: IFT
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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…
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Evolution of Radio Receivers – Part 2: The Superheterodyne Architecture Explained
In the early days of radio broadcast, performance of receivers were barely adequate. It was until the invention of the Superheterodyne architecture that made high-performance receivers a reality. This post examines the building blocks of a superheterodyne receiver in details, highlighting its advantages and limitations, and explains why it is still the best architecture nowadays.