[TenTec] Interference II

[KD7EFQ at aol.com]

Hello, Speaking of interference, has anyone noticed what sounds like a 
digital data stream
or maybe BPL on 40 meters?  It shows up 3 or 4 places about 80Khz apart, but 
it is the same signal each place. it also moves back and forth across the band 
slowly, keeping its 80khz spacing. It also kind of sounds like SSTV but I 
dont think it is. Could we have some BPL propagating? Anyone else hearing this?  
73,  Todd