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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 ++++++++++++++++++++++++++++++++++++++++ Location: near Munich/Germany IRC #wunclub on starchat.net / nick: LDO Website: http://www.signals.taunus.de/ PGP-key : 0x9B4992F9 or 0x0133BD80 ++++++++++++++++++++++++++++++++++++++++ ______________________________________________________________ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Spooks@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
