...and I'd add the cheap Chinese LED's are a serious issue. Our garage door opener was randomly working during and after a recent kitchen remodel. After befriending Google, used the KX3 with a snoop loop, and found that switching on either of 2 banks of new LED's generated enough RF to swamp the garage door opener receiver about 15 feet away. At least in our case the KX3 and loop did a good job of identifying which LED fixtures were the offending culprits, but finding a listing of good vs. bad brands remains difficult, if anyone has seen one would love to know... 73 Scott ka9p
In a message dated 2/2/2016 8:30:33 A.M. Central Standard Time, [email protected] writes: I don't usually chime in on these threads, but not all LED's are culprits. I had originally replaced all the incandescent bulbs in my house with the compact fluorescent (CFL) type. My noise floor went up a couple of dB when any of them were on, so after a couple of those so called "5000 hour" Chinese CFL's actually burned up (yes, smoke, fire and flames) I bit the bullet and replaced all the fluorescent lights in the house with LED's, including some ceiling fixtures that used 2 and 4 foot tubes. Even though I don't have any "light dimmers" in the house, I bought the "dimmable" LED 60 and 75 watt equivalents and now my noise when they on is exactly the same as when they are all off. Getting rid of the CFL's and doing to the LED's dropped my noise floor to whatever the atmospheric (plus whatever the neighbors generate) noise floor is. Sure glad those CFL's tried to burn down my house as it caused me to get rid of them. I was able to hear and work the South Georgia VP8SGI station on 15 meters and he was only maybe S1 here. Bad propagation to that part of the world from Kansas even with 500 watts and a beam so I missed the South Sandwich part. Never heard them except on 30 meters and my antenna favors East/West and I swear some of the people that worked them on 30 were so strong here that HAD to be using more than the legal power limit on 30. Jim - W0EB > > > >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. >> >> --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ 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]
