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| Keywords: Edwin Armstrong wife and portable superhet radio.jpg American engineer Edwin Armstrong the inventor of the superheterodyne radio receiver with his new wife w Esther Marion MacInnis in Palm Beach Florida in 1923 The radio is a portable superheterodyne set that Armstrong built as a gift for her http //www k3dav com/edwinhowardarmstrong htm 1923 author PD-Old Edwin Howard Armstrong Esther Marion MacInnis Superheterodyne circuits History of radio 1923 in radio Radio in the 1920s Portable vacuum tube radios Portable radio receivers Palm Beach 1923 in Florida | ||||
