• Date: September 27, 1921-March 1925... ( Note: According to published sources,[1]the station was converted from experimental amateur to commercial in 1923. However, this call appears in a March 1925 listing.)
  • Frequency:
    • 1053 khz (...March 1925...)
  • Location:
  • Owner of license:
    • Tarnava & Co. (...March 1925...)
  • Subsequent call letters: CYO

The station was created in 1921 by Constantino de Tárnava Jr.[1]


  1. 1.0 1.1 Early Mexican Broadcasting, by Marvin Alisky, The Hispanic American Historical Review, Vol. 34, No. 4 (Nov., 1954), pp. 513-526

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