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Summary

DescriptionIF transformer cutaway.jpg	English: Drawing of an IF (intermediate frequency) transformer with the front surface of the shield can cut away to show the transformer itself. An IF transformer is a resonant transformer used as a bandpass filter in the intermediate frequency section of a superheterodyne receiver. It consists of two windings of fine wire (flat cylinders) around a tube containing an adjustable powdered iron slug core. Each winding has an adjustable mica capacitor (top) connected across it to make a resonant circuit. The two resonant circuits are adjusted so their resonant frequencies are equal to the intermediate frequency of the receiver. The resonant transformer has a much higher Q factor than an ordinary resonant circuit, and is responsible for the selectivity of the receiver, allowing through a narrow band of frequencies from the desired radio station and rejecting nearby stations. Several IF transformers are used in the typical superheterodyne. The aluminum can surrounding it shields nearby stages from its electromagnetic field, preventing feedback which can cause parasitic oscillations
Date	February 1941
Source	Retrieved March 7, 2015 from Radio and Television magazine, Popular Books Corp., Vol. 11, No. 10, February 1941, p. 595 on http://www.americanradiohistory.com
Author	Unknown authorUnknown author
Permission (Reusing this file)	This image is from an advertisement for Meissner Co. without a copyright notice published in a 1954 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain.

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