This really was a jumble of a bunch of time stations and you can hear them interfering with each other when WWV goes quiet. Of course WWV was the loudest, but you can hear all of the stations in there at different points.

WWV & WWVH - NIST (Fort Collins, CO/Kauai, Hawaii)
ON/DSHO - Observatório Nacional/Serviço Nacional da Hora (Brazil)
BPM - Chinese Academy of Sciences (Pucheng, China)

The software is SDRSharp ( SDR# ) and is available for free from [ Ссылка ]

Radio being used is a KB9YIG Softrock Ensemble II RX

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