Abstract
FOR some years past it has been the practice of line communication engineers to make use of iron-cored inductance coils and transformers at speech frequencies and even at carrier frequencies up to 50,000 cycles per second. The cores of such coils were usually composed of iron or a magnetic alloy in the form of wire or of powder embedded in a suitable binding material. During the past year or so, the attention of those responsible for the design and production of wireless receivers has been directed to the possibility of using such magnetic cores in coils and transformers, the frequencies of operation of which may exceed one million cycles per second. It has been claimed that broadcasting receivers giving better performance in a smaller space can be designed by the use of such coils, on account of the facility in screening and the more effective coupling between the circuits which these coils afford.
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Magnetic Materials at Radio Frequencies. Nature 134, 428 (1934). https://doi.org/10.1038/134428a0
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DOI: https://doi.org/10.1038/134428a0