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How about that AM in Cuba on 570AM with the time signal seconds tick overlayed on the talk-radio audio all the time. At the top of the minute is the time tone followed by a Morse code signal ("RR" I think) coming in to Philadelphia. Either CMNA at 10kw or CMEA at 30kw. There are a few US 570 stations with a nighttime 5kw rating that may interfere.
Heard it tonight on the car radio 50 miles north of Phila. Any corrections appreciated.
Dave A
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