Radio-TV Broadcast History
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  • Date: December 7, 1921-2012...
  • Frequency:
    • 500 khz (...January 3, 1922...) [concurrently with other listed frequencies, see history page]
    • 833 khz (December 7, 1921-June 30, 1924...) [concurrently with other listed frequencies, see history page]
    • 1000 khz (...January 3, 1922...) [concurrently with other listed frequencies, see history page]
    • 1210 khz (...March 1925-June 30, 1926...)
    • 870 khz (...June 30, 1927-June 30, 1928...)
    • 1200 kHz (...March 29, 1941)
    • 1230 kHz (March 29, 1941-2012...)
  • Location:
  • Owner of license:
    • Portable Wireless Telephone Company ( NOTE: also listed in some lists as Portable Wireless Telegraph Co.) (December 7, 1921-June 30, 1928...)
    • IHR Educational Broadcasting (...2012...)
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