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. -- 73's, and thanks, Dave For software/hardware reviews see: http://www.nk7z.net For MixW support see: https://groups.yahoo.com/neo/groups/mixw/info For SSTV help see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Mon, 2016-02-01 at 22:48 -0500, johnpierce wrote: > My kitchen, under cabinet lights, are LEDs. With those lights turned > on my > noise floor changes from -128db to -102db. If the circuit is changed > to a > different phase the noise improves by 6db. All of this at 7mhz and > other > higher bands. Needless to say the AM broadcast band is highly > affected by > the LEDs. > > > > Placing a type 31 core with three turn of the AC line feeding the LED > power > supply and a clamp on 31 core on the LED side of the power supply > provides > no improvement! I do not have an oscilloscope to look at the > waveforms. > But given what I have done, why is there no improvement? I was > following > recommendations provided by NK7Z. > > > > AD2F, John > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
