what are the impedance @ frequency specs for these?

I don’t know - it would be good if someone told what mix of ferrite these are made of. Then all the specs could be looked up.

Do you attach one on each end of the cable near the plug? Or just use one per cable?

I suggest you attach one on each one of the cable near the plug.

Has anyone figured out if these are type "Material 43" or is it something else?

probably something else, based upon the price.

How could I use these on a radio antenna attached to my alarm clock? Place on the end of the antenna or at the base attached to the clock?

If your antenna is a single wire, it'll choke off the signal entirely and ruin the antenna. If the antenna has a two-wire or coaxial connection at the clock, place one at the end where the antenna cable enters the clock. It'll choke off interference signals which are usually identical on both conductors (known as "common mode"), but will pass differential mode signals that go in one conductor and out the other, like legitimate signals an antenna would receive.

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Ceedmon 20 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/5mm/7mm/9mm/13mm Diameter Cable, Black

Ceedmon 20 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/5mm/7mm/9mm/13mm Diameter Cable, Black

Product ID: 455296255

Details

Brand
Mateda
Colour
Black
Material
Plastic
Style
Industrial
Installation Type
Clip On

📏5 clip sizes for 3-13mm cables

🔇20-piece noise suppression set

🛡️Durable ferrite core & plastic housing

37960CFA

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Description

🔇 Silence the static, amplify your focus.

BUILT TO LAST - Premium ferrite and plastic materials guarantee long-term durability and performance.
PERFECT FIT VARIETY - Five sizes (3mm to 13mm) ensure a snug fit on all your essential cables.
VERSATILE APPLICATION - Ideal for power lines, USB, audio, video, and data cables—keep your workspace interference-free.
ULTIMATE NOISE BLOCKER - Clip-on ferrite cores eliminate RF & EMI interference for crystal-clear signals.
EFFORTLESS INSTALLATION - Snap-on design clips easily without unplugging—no tools, no hassle.

The Cedmon 20 Pieces Clip-on Ferrite Ring Core set offers a comprehensive solution to reduce RF and EMI noise across a wide range of cable diameters (3mm to 13mm). Featuring durable ferrite cores housed in plastic clips, these easy-to-install suppressors fit snugly on power, USB, audio, and data cables, ensuring long-lasting interference reduction for a cleaner, more reliable electronic environment.

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37960CFA

Duties & taxes included

In stock

Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cote D' Ivoire.

Secure transaction

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Brand	Mateda
Manufacturer	Ceedmon
Country of Origin	USA
Model number	FR1
Colour	Black
Item Weight	308 g
Package Dimensions	15.29 x 8 x 3.2 cm; 308 g
Item model number	FR1
Are batteries included?	No

Ceedmon 20 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/5mm/7mm/9mm/13mm Diameter Cable, Black

Details

Details

Description

Specifications

Common Questions