Amateur radio : how and why of wireless with complete instructions on operation of receiving outfits (1922)
Grainger, Maurice J · New York : James A. McCann · leaf 114
TelephonesAmplifier Vacuum. Iv&<? Separate Hef-rodyne.oscillator 2 2A Vo/fs Fig. 12Receiving Circuit Showing Separate Heterodyne. … Telephones ori, Arr,piif>&r 22&VoL7sVariable A Battery Potentiometer Fig. 13Feed-Back Regenerative Circuit. 94 AMATEUR RADIO when slightly off tune with the incoming sig-nal. Honeycomb or other good compact coilsare recommended. Always vary the B battery when puttinga new detector tube…
Radio · Amateur radio stations
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