[thecabal]

Check out this page for some videos that have the sounds of BPL. Maybe you can find a match here.

http://www.arrl.org/tis/info/HTML/plc/aud-vid.html

[InfraRed]

Thanks for that link! I've listened to around a dozen of those samples. So far, a couple of them sounded similar, but I haven't really found a match yet. I'll keep digging...