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

[Jim Brown]

On 9/15/2012 10:07 AM, Eddy Swynar wrote:
>   with ferrite devices installed at both ends of it.

If you've studied my RFI tutorial, you would know that simply clamping 
cores onto a cord isn't likely to do much on the HF bands, even 10M, 
because the resonant frequency of a single turn through most cores is 
around 150 MHz. For 10M, you must WIND 3-4 TURNS through the core to 
lower the resonant frequency to 10M.

Another point that your story, and Pete's stories makes quite well -- 
persistence pays off!

73, Jim K9YC