FM regenerative receiver and regenerative shortwave receiver with two tuned circuits.
by D.A.W. Mast
I have built an FM receiver with a Q-multiplier based upon
the 'Kurzwellen Audion' receiver described at www.b-kainka.de/bastel3.htm and
the 'UKW-Audion ohne Störstrahlung' at www.b-kainka.de/Weblog/logbuch3.html#ukw. The FM-receiver has a tuned RF preamplifier
stage for more sensivity and more selectivity and a separate infinite impedance
detector with a J-FET which is biased as a drain bend detector. A drain bend
detector is a detector in which the J-FET is biased near the cut-off point of
its -Ugs/Id characteristic.