[RFI] Anyone know what this might be

[Kelly Johnson]

I've been noticing an RFI source lately.  It sounds like a short 1
second blast of "white noise" which occurs at 25 or 30 second
intervals.  It appears to be there 24/7.  I hear it on 40 through 17
meters.  It peaks at about S7 or S8 in a 2.4KHz bandwidth.  That's
pretty strong considering that my noise level at nigh in a 2.4KHz
bandwidth is only about S1 or S2.  It's not strong enough for my
portable receiver to pick up so I've had trouble DFing it.  I have yet
to try to DF it with my HF yagi.

Anyone have an idea what this may be?