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.

Sources
  • ARRL publication QEX, January/February 2007, pages 45–46.
gollark: That sounds mean.
gollark: Again, the consequences for getting a test wrong are much lower.
gollark: Lots of things are "possibly good systems". They should probably be demoted in the rankings after repeated failures.
gollark: When they were tested at scale we were pretty sure they wouldn't be particularly harmful.
gollark: I actually don't want multiple things.
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