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 136
mine three blocks away from his instru-ments with the windows shut. Two kinds of amplification are in commonuse at the present time—radio frequency am-plification and audio frequency amplification.With the first system the signals are amplifiedfirst and detected afterwards. With the sec-ond the… … INDUCTANCE
Radio · Amateur radio stations
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