Unknown "whistle" signal on 49m broadcast band

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Unknown "whistle" signal on 49m broadcast band
6065 short.jpg
Frequencies 6.065 MHz
Frequency Range 6.065 MHz - 6.065 MHz
Mode USB
Modulation
ACF
Bandwidth 10 kHz
Location South Korea
Short Description Unknown whistling signal at 6065 khz
I/Q Raw Recording
Audio Sample

Hello, using a KiwiSDR located in South Korea found a strange whistling signal at 6065 khz (49m broadcast band). I suppose that this is pirate or marine beacon, but is it something else? Also, this signal is heard through many KiwiSDR receivers located in East and Southeast Asia.


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