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FRG-7 is the designation given to a HF communications receiver designed and built by Yaesu of Japan in the late 1970's.
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 RA-17L.
Owing to its 'Wadley Loop' circuitry, the FRG-7 has outstanding frequency stability and proved vastly superior to most all other comparable radios of that time.
It has a frequency coverage of 500 KHz to 29.99MHz - is analogue tuned - and may be powered by 'D' cells or from mains electricity.
There are also FRG-7 'clones' in existence by Sommerkamp of Germany and Sears of the USA - these are Japanese produced sets with different badges.
The Yaesu FRG-7 receiver has a large following of enthusiastic owners with many sets still in daily use worldwide.
This is the bit I always enjoy unpacking the latest aquisition for the shack. Its a bit like my childhood at Christmas when I am opening my presents and thinking is this going to be just what I want Hi.
The above two pictures (temporary better to follow)show my FRG-7 and its serial number. I am trying to get a date of manufacture out of curiosity !
This picture shows my friend Bill's FRG-7 and if you click the picture it will take you to a very interesting modification page.
Click on this picture to visit Greg's FRG-7 info page .
There are some interesting mod's and information on the history of the "Wadley Loop"
Doesn't look much different does it but this is a Sommerkamp FRG-7. !! Click on this picture to see some good hi-res images of the inside of a FRG-7.
Click this logo to get info on a FRG7 Mini Filter Switch Board upgrade.
Click the small FRG-7 picture to visit Monitor Internet's modifications page
