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Popularly known as the 'Frog Seven', it was one of the first commercial SWL receivers to utilise a triple-conversion superhet circuit with the 'Wadley Loop' system - although such an architecture had been seen in earlier tube radios manufactured for government use, most notably in the Racal RA17.
It has a frequency coverage of 500 kHz to 29.99 MHz. It is analogue tuned and it may be powered by D batteries or from mains (AC) electricity.
The earlier FRG-7 that appeared in Europe were marketed under the Sommerkamp brand.
The Yaesu FRG-7 receiver has a large following with many sets still in daily use worldwide.