Here's a 30 second clip I just made:http://ac8rc.org/ac8rc/audio/20m_rfi.mp3
I made this recording on 14.260Mhz, where supposedly 9L1X is transmitting. It's about S-7 there.
I can hear it from 13-18 MHz right now, 1845Z, 11 OCT 2008.
I can hear it strongest from my shack with my Cobra Ultralite Sr antenna at about 30 feet. I can also hear it from my mobile rig in the driveway.
This noise is very common for me. Sometimes I can hear it all the way up to 6m, sometimes as far down as 40m. Most of the time 10m is wiped out by it.
Seems to vary in strength, possibly with atmospheric conditions.
The frequency of the pulse is quite stable.
I can't hear it with my HT at all, or I'd try to radio-locate.
I've turned off the main breaker to my house and still hear it.
Anyone heard anything like this before? Power lines or something?