Tag: superheterodyne receiver
-
Evolution of Radio Receivers Part 6: Image Rejection, Dual/Multiple Conversion, and the Sony ICF-7600A
Part 6 of the series discusses the why and how of dual/multiple conversion. We will quantify the image problem with simple calculations, examine why a single high IF is rarely ideal, and show how dual conversion solves both requirements at once. As an example, we will examine the Sony ICF-7600A dual-conversion multi-band portable. Finally we…
-
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…
-
Evolution of Radio Receivers Part 3: Build a Classic 6-Transistor Superhet Pocket Radio
In Part 3 of the Evolution of Radio Receivers series, we build and align a classic 6-transistor AM superhet pocket radio. Complete schematic, parts list, construction tips, step-by-step alignment, and real-world listening test results. Perfect hands-on project for electronics hobbyists and students.
-
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.