[Spooks] XSL Question

[Mike Tibor]

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