60 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter/Video Cable Power Cord (Black)

These are perfect, and just what I needed. My cable modem was dropping its connection at least once a day, sometimes many times a day. I put several of these on the coax line on the modem side of the splitter where the connection comes in and the interference on the line went away immediately.The great thing about these is they are packaged in separate bags by size. You can always have other sizes available to put on power cords, ethernet cables, audio cables, etc.

That are very easy to install.There are different sizes.Do a very nice job on the stray RF noise.I have them almost everywhere.On every piece of coax and on the mike cable.If you say I don't need them.Ok.I say not yet but you will.When you start running 1,500 Wat amplifier you will wish you had some.They work very well and are inexpensive.I bought this one time.I have them in the shack, pickup truck, wife's car (she's a ham also).I have some left over and have given some to my fellow ham operator'sGreat to have on hand.I keep them in a crown Royal bag.

This is a wide assortment of ferrite rings. If you are noticing video interference in your monitors then you just need to clip one of these rings to your main line going into your device and it should clear up the noise interference. I have these clipped on several different devices and I have noticed a difference in clarity. I recommend these ferrite rings to anyone seeing video interference on their devices.

Great product, I was having RFI issues on my ham radio setup, primarily on digital modes, as my USB cable is not shielded very well. Using 2 of these, 1 on each end, with 1 coiling I was able to mitigate all of the RFI issues which kept causing WSJT-X to crash, now to find out where that RFI is coming from in the first place!

Good variety pack for filter chokes. We deal with RFI occasionally on Field Day, and you never know what gauge of wire will need shielding. Throw a few of each size in a bag and you're ready for anything. Holds secure, but is usually pretty easy to release if you want it off.

This review is for the Phono Stage Analog Audio enthusiast. I bought these with some skepticism but thought “what the heck”. [My System] I have an all tube analog playback system: A VPI Scoutmaster Turntable, Sumiko EVOIII Bluepoint Special High Output 2.5mV cartridge, Ming Da MC767-RD Phono Pre Amp, Pangea Audio Premier XL Phono Turntable Cable with built in ferrite rings on each end and grounding wire, Antique Sound Labs (ASL) AQ 2001 DT Pre Amp, Mogami’s top RCA interconnects throughout and a pair of ASL Hurricane DT Mono Block Power Amps with 8 KT88s in each amp. [The Problem] As you already know, eliminating phono stage ground loop and RF Interference from any system can be a frustrating task, even after attaching the perfunctory ground cable from turntable to amp/pre-amp. Before clamping these ferrite clips on I kept getting the usual annoying electrical hum, faint background FM radio station interference and the dreaded/annoying CB Radio operator chatter (and the vile unlicensed discourse that comes with it). This was the case even after having a renowned high end audio tech make extensive grounding circuitry modifications on my Ming Da. [Methodology] I clipped a ferrite ring to each end of the grounding wire (2), each end of the left RCA and right RCA cables going into the phono preamp (4) and each end of the left RCA and right RCA cables going out of the phono preamp (4) and one on each end of the RCAs out of the ASL Pre Amp to the Mono Blocks Power Amps (4) for a total of 14 ferrite rings. [Outcome] To my pleasant surprise, when I turned everything back on, all the aforementioned noises above were gone! Even when I cranked the ASL Preamp gain full tilt, the radio stations (CB and FM) were nowhere to be heard, even faintly. The electrical ground buzz was gone, too. All I heard, and only at super high ridiculous volumes (that I would never use in real life) was the noise from the phono preamp which is to be expected due to the inherent burden of MC/MM amplification. At normal listening levels my noise floor is so scarcely audible it’s basically gone, even before I drop the needle. [Conclusion] To my fellow analogue/vinyl enthusiasts fighting the ground loop/RF monster, I say buy these things. I never write reviews but this one was a must. Happy Listening!

Seems to help with RF in Shack. But not great.

I was getting tons of loud GPU ground loop/common mode noise via USB to my external DAC. Nothing worked, even the ground loop isolation devices.After applying one medium choke to each of the PCI-E connectors, one large choke across both, and one large choke across the aux CPU power wires (all close to the noise source, so GPU and mobo respectively) I am hearing absolutely no noise - even with Furmark. These also double as cable management clips.Put simply: the medium chokes are large enough to clip over single PCI-E power wire bundles, and the largest chokes are large enough for two PCI-E power wire bundles.Super easy to install: open and click closed.