What is infradin? Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Modern all-wave (LW, MW and HF) receivers and transceiver receive paths operating at frequencies up to 30 MHz are often performed according to a superheterodyne upconversion scheme, with a first intermediate frequency (IF) in the range of 45 MHz and higher. Such receivers typically use multiple frequency conversions, with the second and third IFs being low.
The main advantage of such a solution lies in the large suppression of interference penetrating through the image channel, and the main disadvantage is the difficulty in creating IF filters with good characteristics at high frequencies.
However, few people know that upconverting receivers used to have a special name - infradyne. Historically, it was given in the 1920s by E. M. Sargent (E. M. Sargent, Rem-loc Radio Co) to his company's CB receiver with an IF of 3500 kHz. The main goal was to circumvent the patents for superheterodyne receivers owned by the "Radio Group" of companies (RCA, GE, Westinghouse, etc.). It is curious that in the first infradyne of the IF it was not the difference between the frequencies of the local oscillator and the received signal, but their sum.
So, infradyne is a superheterodyne receiver with an IF higher than the frequencies of the received radio stations.
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