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The transmission is in AM mode with only the lower sideband (part of the time H3E and the rest H2B/H2D) and consists of 780 Hz tone pulses repeated every ten seconds and voice announcements in Spanish.
Notes and references
- Instituto Oceanográfico de la Armada, Casilla 5940, Guayaquil, Ecuador
- Gerd Klawitter (1980). List of Time Signal Stations (9th Edition). p. 22.
- Recently, logs of HD2IOA appeared at the UDXF in March 2008.