View source for HD2IOA

{{Short description|Time signal radio station in Ecuador}}
'''HD2IOA''' is the callsign of a [[time signal]] radio station operated by the [[Military of Ecuador|Navy of Ecuador]].<ref>Instituto Oceanográfico de la Armada, Casilla 5940, Guayaquil, Ecuador</ref> The station is located at [[Guayaquil]], [[Ecuador]] and transmits in the [[high frequency|HF]] band on 3.81 and 7.6&nbsp;MHz.<ref>{{cite book | author=Gerd Klawitter | title=List of Time Signal Stations | year=1980 | pages=22 | edition=9th }}</ref>

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&nbsp;Hz tone pulses repeated every ten seconds and voice announcements in Spanish.

While sometimes this station is described as defunct, reception reports of this station on 3.81&nbsp;MHz appear regularly at the [https://groups.io/g/UDXF/search?q=HD2IOA Utility DX Forum].<ref>Recently, logs of HD2IOA appeared at the UDXF in March 2008.</ref>

==See also==
{{Portal | Ecuador }}
*[[BPM (time service)]]
*[[DCF77]]
*[[Time from NPL]]
*[[TDF time signal]]
*[[RBU (radio station)]]
*[[RWM]]
*[[YVTO]]

==Notes and references==
{{reflist}}

{{TimeSig}}
{{Time Topics}}
{{Time measurement and standards}}

{{DEFAULTSORT:Hd2ioa}}
[[Category:Ecuadorian Navy]]
[[Category:Science and technology in Ecuador]]
[[Category:Time signal radio stations]]