SITOR-A Unknown data

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SITOR-A Unknown data
4158khz.jpg
Frequencies 4.158 MHz
Frequency Range 4.158 MHz - 4.158 MHz
Mode USB
Modulation FSK QPSK
ACF
Bandwidth 2 kHz
Location Eastern Asia
Short Description When I was receiving the SITOR-A signal,A 2khz signal similar to QPSK modulation suddenly appeared.
I/Q Raw Recording Download file
Audio Sample