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)

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!

My welding rotator was rebooting every time I’d trigger the high frequency start on my TIG welder. I bought these as part of my remedial action to prevent this. Snapped them onto the power and ground lines on the DC power supply as well as a larger one on the incoming AC and it now works perfectly.

Works good

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!

My stations are already heavily grounded, so I may not be the best reviewer, but they do seem to quiet mobile noise.

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.

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

I am a new ham and bought this set just to have, not entirely understanding when and how they're used.Since then, I've set up antennas inside my computer room on the ceiling (yes, i know, bad idea, but it's temporary). Anyway, transmitting on 6m/10m/12m FT8 would cause all kinds of USB devices to disconnect/reconnect, and monitors to turn off/on.Adding these ferrites, especially the largest size with the wire doubled over about 3 times per ferrite, solved all of the issues. Attach them close to the connection to the PC, or where power cords connect to monitors/PCs.I'm very glad I've gotten them and will probably need to buy another pack soon.