Clip-on Ferrite Choke Core 20 Pcs - Ferrite Bead RFI EMI Noise Suppressor

Great product! Easy to use and install

I got some of these ten years ago when I got rid of my loathesome cable TV company. I had put two of them on the coax cable, right before the antenna amplifier. It helped get rid of the noise the cable attracted between the outside antenna and TV.More recently, a favorite TV station, with a high quality signal, had major pixeling and sometimes signal loss for a few hours a day. Starting around noon. At first I thought the station was illegally cutting power. More recently, AI told me power stations can create noise, that might affect a certain wavelength, and might affect only 1 channel.I tried using these on every cable connected to the power stations. AC out from power station, and DC input from solar panel. Putting a choke on the input wire going into the TV, right next to it, helped significantly. However, my power stations are on rollers, and get moved depending on use. AFter finally solving the interferecne problem with that last choke, the problem came back after moving the power stations in the room. So i saw the one power station seemed to be the culprit. With a choke on, when it was DC inputting to a power station around noon, pixels started and signal gone. I pulled the dc inuput from the solar panel array, and the signal instantly came back on. So I tried twisting the dc input wire. Its said that twisting can offset interference coming from your MPPT inverter. The next day I plugged in the regular cable, signal goes out. I plugged in the twisted cable, and signal comes back on. AI says about 4 to 6 twists per foot (my cable was 10 awg). I didnt twist a cable with both red and black together. I had a 10 foot 10 awg with andersen connectors, and the wires were separated from end to end. Pulled the plastic sleeve down, separated the housings, taped and twisted the wire starting from about 4 feet away, and twisted it as close as possible to the plastic housings. reassembled, and finally, with chokes and a wire twist on the stubborn one, no mid day interfernce from my biggest power station on my OTA tv signal. Its amazing the interfernce from 12 feet away could not only ruin the reception, but also give an error message on the TV that there was no signal. Plenty of signal now. OTA signals are not very powerful, and are easy to interfere.

I thought I was going to have to do a lot more work than just slapping a ferrite clamp on my amp cable, but yet, that and one on the HDMI cable that was causing my EMI issues seems to have resolved it.This wasn't your usual 60 cycle hum. The humbuckerknocks that right out. This was a much higher tone, around an A5, fluctuating hiss coming from, of all things, the HDMI cable on one of my computer monitors where I do my home studio recording.I don't pretend to understand what voodoo science is going on here, and I won't pretend to give you advice on how to deal with specific EMI issues. I just followed advice I received on /r/AudioEngineering, but in my case I didn't even need to wrap the cable as a few posts had suggested I might need to do. Just the ferrite chokes wasd enough.For that matter, I don't even know if I needed a choke on my amp cable since the EMI seems to originate from the HDMI cable and was being picked up by my guitar pickups (unfortunately no amount of shielding in the cavity was going to help here!).But yeah, these are cheap, and they work.

It's a nice assortment to start out with. The biggest one fits on 3/8 inch (1cm D) cable easily, maybe 1/2 inch. Clamp-on Ferrite beads like this are for low RF frequencies, 100kHz-10MHz. May suppress AC line noise (from motors and dimmers), which often interferes with 0.5-1.7MHz AM broadcast radio.

I bought the ferrite choke cores hoping to eliminate RFI (Radio Frequency Interference) on two radios in my home. I recently purchased a new washing machine that is located in my basement. While doing a wash, I turned on a radio in my kitchen which is on the first floor of my home. The radio was making sounds, loud buzzing and squealing, that seemed to coincide with the washer's washing and spinning cycles. Doing some research, I discovered that the motor type of my new washer emits radio signals when operating and are received in older radios (such as my radio.) Who knew? Anyway, my research found that these ferrite bead cores are recommended to eliminate the radio frequency emitted by the washing machine. Well, the cores helped to reduced the loudness of the buzzing a little but not completely eliminate the sounds. The bead cores themselves appear to be well made, came in a variety of sizes, and were packaged nicely. They would probably work better on a newer radio. Anyway, I'll just not use the radio while the washing machine is going through its cycles. It's not really a problem but I learned something along the way. I never knew about the use of ferrite bead cores before.

Unable to find the ferrite mix formula. I don't see much difference in the noise level after installing them. Easy to use. But are they effective?? Go buy ferrite with clearly defined mix number. Yes, you'll pay more.

I ordered this product to eliminate spark noise on an airplane that I fly. The product arrived in 24 hours and I installed the choke the next day. The noise was reduced by 90% where nothing else had worked. I can now use the airplane radio and a hand held radio with no interference. I would suggest that anyone with similar problems buy this product! The beads worked as advertised. I saved hundreds of dollars vs installing resistor plugs and wires, and the chokes were compatible with all the wiring. It took about 10 minutes to install after removing cowlings.

Didn't do anything to help with the audio interference sound coming from my speakers. The fit was fine if a bit loose, and the clasps were either very loose or almost impossible to snap into place. I really wish this had worked, but my speakers still make a constant high pitched whine.