RADIO-FREQUENCY RESISTANCE AND INDUCTANCE
OF COILS USED IN BROADCAST RECEPTION
By August Hund and H. B. De Groot
This paper gives experimental data on the radio-frequency resistance and
inductance of certain "low loss" coils within the range of broadcast frequencies.
The coils are of different shapes and wound with different kinds of wire. The
results are plotted in graphs so that the reader can use them for selecting a
coil for a desired purpose. For the data to apply it is necessary that the coil
be constructed in accordance with the information given in a table. The dimensions are such that the coils are suitable for modern broadcast reception. A
discussion of the important characteristics of coils is given. Of the coils measured
the loose basket weave coil and the single-layer coil have the lowest radiofrequency resistance. Where a binder is required for holding the turns in position, collodion introduces the least amount of resistance. For the entire range
of broadcast frequencies (500 to 1,500 kc) No. 32-38 litz has somewhat smaller
resistance than No. 24 AWG d. c. c. wire; however, for most work No. 24 wire is
suitable.
Washington, May 25, 1925
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