Does Mexico have a time transmitter like NIST's WWV in the United States?
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No, there are no radio stations that broadcast time and/or accurate frequencies in Mexico.
According to these webpages, here are no time or frequency stations anywhere in Central America.
- https://www.smeter.net/stations/hf-time-frequency.php
- https://en.m.wikipedia.org/wiki/Radio_clock#
- https://en.m.wikipedia.org/wiki/Radio_clock#List_of_radio_time_signal_stations
According to the last link above, there are some in South America if that helps you.