an X means that the receiver is equipped with an oscillator for crystal controlled fixed frequency operation, and.J will say that all components meet the JAN (Joint Army Navy) Standard requirements. An eccellent review of all types is found in the book "Shortwave Receivers Past & Present" by Fred Osterman, the original version of Les Locklear's listing under The typeplate is usually found on the cover of the r.f. The SP-600 has been produced in very many variants over the years. In French: TSF for Télégraphie sans fil.Īll listed radios etc. Here you find 141 models, 89 with images and 58 with schematics for wireless sets etc. See "Data change" for further contributors.
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