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rca: AR-812 'Semi-Portable'; Radiola Superhet

Martin Renz Ernst Erb Vincent de Franco Martin Bösch Mark Hippenstiel Bernhard Nagel Otmar Jung Heribert Jung Eilert Menke 
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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » rca: AR-812 'Semi-Portable'; Radiola Superhet
Moisés Piedade
Moisés Piedade
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28.Aug.14 11:16

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Armstrong explains some of his research  work trying to do the first super heterodyne radio viable.

Obtained from a copy of Wireless Age, April 1924, stored in