20 PCS EMI RFI Noise Filter Cable Ring/Noise Filter Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter/Video Cable Power Cord (Black)

LED headlights causing radio interference? These helped me solve my interference.

The cheap speakers in my bedroom that I use to play white noise at night were picking up my neighbor’s Morse code transmissions which woke me up constantly. On the advice of someone in a ham radio group I ordered these. I had to use most of the pack and it worked much better when I used the big ones and wound the cord around multiple times rather than just snapping on the small ones, but I’m no longer being jolted awake by taping every time my neighbor is feeling chatty at night and I didn’t have to ask him to mess with his antennas. Well worth the money to keep peace in the neighborhood.

The pack of filters made it easy for me to choose the right size, and to apply several filters to one line. Filters were very helpful at suppressing the RFI I was experiencing.

Bought these without knowing their class of ferric material. It most be class 31 or even lower. It does not provide filtering for 300-400Mhz band to filter cheap LED light noise from interfering with garage door opener. I'll keep them for a audio choke on computer items, but buyer beware if you buy chokes without the manufacturer telling you the class of ferric used.

My computer speakers would pick up AM stations on occasion. Super annoying. I wrapped a pair of these around the wire in and haven't heard it since. I'd call that a success. Plus, for the price I got a bunch of them. I think I'll give my car's bluetooth receiver the same treatment.

I put these on cell phone charge wire and headphone wire for using my cell phone as GPS and music on my motorcycle. I had a lot of alternator and ignition system whine from the cell phone through my helmet speakers which I believed was coming from the phone's USB charging wire. I put 2 of these on each the USB charge wire and the headphone wire and it eliminated probably 75% of the noise. Good assortment of sizes and they clip on tight and don't move.

These don’t work. I installed them on both power wires to the stereo, as well as the power to my amp for my door speakers, I still have an alternator whine through my speakers. I even put three on each power to the stereo and all four medium sized on my amp power, and tried 2 on the ground for the stereo. Nothing. No change. Easy to put on and super cheap, comes with a lot of them, but they don’t work.

I purchased these because the LED lights in my shop were interfering big time with my CB Radio. I could not even here a local transmission with the lights on. I installed 4 of them on the feed line to the LED shop light. One to the power converter that powers the Radio and one on the external speaker. These took away 98 % of the distortion. Still need to keep the light off for SWR tuning. I am very pleased so far

Product functions properly