“The Magic of Mixers:
From Tuner Radio Frequency Receivers to Superheterodyne Receivers”
Speaker: James Hedrick, WB2LKZ
Abstract: The first RF receivers used chained-tuned RF amplifiers all operating at the same frequency. These receivers were difficult to design and even harder to tune. A mixer is a three port circuit that is used to modulate, or demodulate, an RF signal. In this talk we will be exploring how mixers work and how they led to the superhererodyne receivers we use today.
James Hedrick has always been interested radio communications and has been an amateur radio operator for about fifty years. He got his FCC commercial radio license as a teenager and designed, installed and repaired public safety radios and marine electronics. He spent eleven years with the New York State Thruway Authority designing a new toll collection system to replace the aging electromechanical system, and adding E-ZPass. For the last twenty+ years Jim has been a member of the Electrical and Computer Engineering Faculty at Union College, specializing in radio communications, digital design, data communications and networking, and embedded systems.