This video shows how we located and eliminated rf interference that we were getting on our amateur Radio. Interference was being caused by a battery charger on the AC power mains.
Some devices that I have found to cause RFI on the shortwave (HF) bands: switching power supplies (including most wall wart power supplies), front loading washing machines, garage door openers, touch lamps, security lights, fluorescent lights (including CFLs), street lights (including LED types), day/night photocell lighting controls, LED lights, light dimmers, flat screen TVs, CRT screen TVs, electric fences, gas stove igniters, battery chargers, high-speed internet junction boxes, electric motors, refrigerators, hot tubs, overhead power lines and transformers, wired smoke and CO detectors, computers, and surge suppressing power strips, etc.
You are right! Jim K9YC who holds a BSEE degree, says there are around 36 devices in a typical household. His publications can be found here: audiosystemsgroup(dot)com/publish.htm
I had the same exact RFI from a battery tender in my garage. Didn’t need it anymore so I took it out of service. Months later, I had the same problem with another charger for my boat in the backyard. I used a Mix 31 clamp-on ferrite on the AC power cord and RFI disappeared! de K6TQ
Other than a welder, battery charges are the worst emitters of dirty power. Try reading the output ever with a True RMS multi-meter and you are not going to get a valid reading. I discovered this while trouble shooting why my 12 volt fridge wouldn't run on my boat until I took the battery charger out of the act. I put my meter on it without getting a reading yet, it does indeed charge my batteries. Go figure. In commercial electrical applications we use to have to install isolation transformers upstream from these things to CLEAN UP the noise. Good Video. Thanks.
I have a AM/FM cassette radio that the FM is blanking out every time I key up a transmitter. I‘ve tried RF chokes on the AC line and on the antenna input to the transmitter but they don’t seem to do anything. Do you have any suggestions on how to fix it? de N0IAV
Hello, I wondered if you could offer me some advice. I own a Rhodes electromechanical piano. Previously it had a passive output, so I installed a purpose built active pre-amp, working on a 24V power supply. Since I installed it, I am now getting interference on the audio from the piano that was not there before. Specifically there is some static, and behind the static I can hear radio music coming from a radio station. So clearly the piano is picking up RF interference. Do you have any tips on how I might block this interference from my piano? If I plug a guitar amp into the same surge protector that the piano is plugged into, the interference also comes out of the guitar amp. As soon as I unplug the piano power supply from the surge protector, the interference in the guitar amp disappears. Thank you for any advice.
Hi Tom, Sam here (K6UA)... what are your thoughts on power conditioners and regeneration units for cleaning RF noise on electrical mains before powering HiFi audio equipment? Snake oil? or makes a difference?
Hi Sam, i dont have any experience on that. I have found that there are a number of the cheap wall warts will cause a lot of interferrence. I have put ferrites on my ac cords but i didnt see much change. finding that battery charger was a big improvement.
@@chuckdebian2205 sadly I don't... this property was taken by some members of Dale's family and dismantled .. I currently don't operate at all, as I'm living in a Condo in NorCal..
I have a pole at the end of my drive way, my neighbours plasma tv was pumping noise in to the mains and it was travelling from the phone line back to the pole at the end of my drive way so it is possible, I stood at the end of my drive with a Tecsun PL660 and followed the noise to the exact house causing the issue
I've got a window a.c that causes faint specs on my led t.v. when the compressor kicks on. Now I have to find some folks that would know how to deal with it.
53 is the earth's natural golden ratio frequency. It's becoming more and more stronger as the density of earth is changing. And I'm interested to know what it is recording now.
I have a portable AM/FM cassette radio that the FM blanks out every time I key my amateur radio and CB radio. Tried to stop it without success. I tried RF chokes on the coax from my antenna and AC line both on FM radio and amateur and CB and still no solution I don’t know what else to do. Any idea of what I can do?
sounds like tipical front end over load of the receiver. That means they receiver might not be so selective. See if it does it on other radios. Also you did not mention power. how much power are you running. based on how close and high power this may be pretty normal.
I wish the FCC would do a better job at policing these noisy switching mode power supplies and chargers on the market today. It's really bad. Can't even charge an iphone without it destroying the entire ham band with high noise.
