[Spooks] XSL Question

[Leif Dehio]

At 07:12 27.10.2011, you wrote:
>After listening to XSL (Slot Machine) on 8587.5 kHz this evening for a
>bit, it strikes me that it sounds an awful lot like the other HF radars
>I've heard, but with the tone sequences.  I haven't found any similar
>speculation in my google searches though.
>
>Everything I've found via google searches seems to simply repeat the same
>thing--that it's some kind of telemetry transmission from the Japanese
>Military.  I find it very odd that anyone would transmit telemetry for
>anything on 8 - 13 frequencies (or more) where that telemetry repeated the
>same pattern for hours.
>
>Why couldn't this be some multi-frequency HF radar, but where the
>frequency spread was very narrow, centered on each of the well known
>frequencies?
>
>Or maybe even a mix of data interleaved with radar pulses?
>
>I'm new to this, so be gentle.  :-)
>
>Mike


Mike,

it's a PSK-waveform used by the Japanese Navy to broadcast
messages to vessels out at sea. Just like you'll see several
NATO circuits broadcasting "shore -> ship" traffic via several
parallel STANAG 4285 channels, the Japanese Navy does the same,
however using a proprietary (non-standardized) waveform.

The part that sounds like a slot machine is the system in idle
mode, while the audio changes over to a more rushing sound when
the system sends message traffic.

It's definitely not a radar system.

BRGDS

//Leif


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