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| Keywords: Edwin Armstrong and superregenerative receiver.jpg Edwin H Armstrong and his new invention the superregenerative receiver in 1922 This was probably taken at the June 28 1922 meeting of the Radio Club of America in room 306 Havemeyer Hall Columbia University New York at which Armstrong demonstrated the superregenerative receiver The receiver used only 3 vacuum tubes visible but was as sensitive as existing receivers with 9 tubes However it didn't prove as useful as the other receiver circuits he invented the regenerative receiver and the superheterodyne receiver which is used in virtually every radio and television today The black metal bell left is the horn loudspeaker modern cone loudspeakers hadn't been invented yet and the wires on the frame right is the loop antenna for the radio The caption of the photo read <br /><br /> THE MAN WHO ORIGINATED THE ARMSTRONG CIRCUIT Hertz Marconi De Forest - and now Edwin H Armstrong head the list of scientists who have made radio as we know it today possible Armstrong has the honor of making three definite contributions to radio FIRST he originated the regenerative feedback vacuum tube circuit SECOND he originated the super-heterodyne circuit the most sensitive receiver ever produced THIRD he invented the superregenerative receiver which has just taken the world by storm and which bears his name Downloaded August 26 2013 from http //books google com/books id yffNAAAAMAAJ pg RA1-PA159 Popular Radio Popular Radio Inc New York Vol 2 No 3 November 1922 p 159 on Google Books author 1922 Edwin Howard Armstrong PD-old-70-1923 | ||||
