Regenerative loop antenna

The regenerative loop antenna can consist of a tuned signal winding on an open X frame with a feed back winding in close proximity. High effective gain is achieved, for example by placing this feedback winding in the drain circuit of a JFET (junction field effect transistor). An antenna of this type employing vacuum tubes was constructed by Vladimir Zworykin in the 1920s.

• ARRL publication QEX, January/February 2007, pages 45–46.

• billyoungradio.com: A Regenerative Loop Antenna

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