[RFI] Noise changes when room lights turn on / off

[Tony]

All:

The noise that appeared this evening at 7:00pm may have something to do 
with AC power coming into the house. I noticed that the noise changed 
when I turned the shack light on and off. This video shows what happens: 
http://www.youtube.com/watch?v=EYHbpLfQ1gc

There are no florescent lights or touch lamps in the house. Unplugging 
the shack light does not make the noise go away. Turning the shack's 
light switch on or off with the light unplugged does not change the 
noise. The noise persists with power supplies, computers and TV's turned 
off or unplugged.

I'll investigate further and report back tomorrow.

Thanks,

Tony -K2MO