XSL - 'JAPANESE SLOT MACHINE'

XSL is a Japanese military station that transmits data in the form of QPSK (quadrature phase-shift keying) at 1500 Bd. It is known as the 'Japanese Slot Machine' due to the signal resembling the sounds made by a slot machine. It operates on several frequencies, including 4291 kHz. The XSL signal is transmitted from the Japanese Maritime Self-Defence Force Ichihara Transmitting Station in Ichihara, Japan. (Numbers 2016)

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VIDEOS OF MY RECEPTION OF XSL.

4291 kHz - 17th August 2025.
1317 UTC.

References.

1. Number Stations Research – Numbers Stations Research and Information Center. (2016). The Japanese Slot Machine – XSL XSL – Japanese Navy. [online] Available at: https://www.numbers-stations.com/japan/the-japanese-slot-machine/ [Accessed 30 Aug. 2025].‌
2. Rogers, B. (2025). Mystery Signals. [online] Signalshed.com. Available at: http://www.mysterysignals.signalshed.com/page20.html [Accessed 30 Aug. 2025].‌