[Elecraft] Noise from LEDs

[Bob McGraw K4TAX]

Also, consider wrapping the PS in Aluminum Foil.  That may provide some 
degree of shielding.

On that point, I have two Direct TV receivers that were prone to 
changing channels, resetting, and such when I transmitted.  This was 
proven to be the broad RF input for the RF remote control portion of the 
receiver.   No amount of ferrite on the cables helped.   Even after they 
were switched  to IR Remote, no improvement.   Finally  I wrapped the 
units in Aluminum Foil leaving a small 1/2" window for the IR remote 
signal access.   Problem solved.

73
Bob, K4TAX
K3S - sn 10163

On 2/2/2016 8:04 AM, Dave Cole wrote:
> Hi,
> Jim is correct, replace it...  I had a neighbor, and I had several
> ferrites on it, all with many many turns of cable, and got very little
> positive result, replacing it gave me a positive result...  :)
>
> Those things generate a horrendous amount of RFI, and the power cables
> to the lights are nothing but antenna...  Consider how much reduction
> you will need to get to your original noise floor.  If you must keep
> the PS, then more turns is better.  Replacement is always preferable to
> reduction techniques.