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  • 21 Aug, 2019

  • By, Wikipedia

File:Large Spiral Inductors In Radio Transmitter - France 1922.jpg
The spiral shape of the coils reduced resistive losses at radio frequency due to proximity effect. The copper conductors are made in the form of wide strips to increase their surface area in order to reduce their resistance at radio frequencies, since radio frequency currents flow along the surface of conductors due to skin effect.

Caption: "Large tuning inductances required to operate on long wavelengths"
Date Source Retrieved September 4, 2013 from "The New French Radio Central" in The Wireless Age", Vol. 10, No. 1, October 1922, p. 57 on Google Books Author Unknown authorUnknown author

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