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On Thu, 27 Oct 2011, Leif Dehio wrote: > 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 Thanks very much Leif, Is it a PSK waveform while idle, or just when transmitting data, or both? The idling sound pattern is what is intriguing to me, and it got me thinking about it being a radar, or something else that act similarly. I've heard the data sound pattern and it does sound exactly like STANAG 4285 data transmissions as you mention. However, the chop-chop part of the idle sound seems remarkably like the Russian "woodpecker" and other OTH radars I've heard. It didn't seem beyond possibility that the additional tone patterns were laid on top of (or interleaved with) the "chop-chop" part, and I was curious about it. There are lots of examples of signals embedded, or interleaved with other signals which are then later stripped out. X10 devices might be a good example, which use signalling over the 110v AC power lines. Another example might be IP over AC power lines. I'm very new to this, so I'm sure this has been brought up before and dismissed for various reasons. I just couldn't find any discussion about it in my Google searches. Thanks again, Mike ______________________________________________________________ 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
