These are QSL cards from the lighthouse radio stations of the Nyudou, the Tappi, and the Hachijyojima. All of them are on the air every hour for approx. a minute on 1670.5kHz, just like other stations. They can be observed well all through the night here in Saitama, Japan. The Japan's lighthouse radios share the same frequency of 1670.5kHz, and transmissions of each station go out in turn.
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