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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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

Product ID: 455296255

Details

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

🔌5 sizes fit 3-13mm cables

🖇️Clip-on design for easy install

🛡️Blocks RF & EMI interference

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Description

🛡️ Silence the static, amplify your focus!

VERSATILE APPLICATION - Ideal for power lines, USB, audio, video, and data cables—perfect for home, office, or professional setups.
EFFORTLESS INSTALLATION - Innovative clip-on ferrite cores snap on quickly without tools, saving you time and hassle.
ULTIMATE NOISE SUPPRESSION - Effectively reduces RF and EMI interference, keeping your workspace and devices interference-free.
UNIVERSAL FIT FOR EVERY CABLE - Five precision sizes (3mm to 13mm) ensure a perfect clip-on fit for all your essential cables.
DURABLE BUILD FOR LONG TERM USE - Crafted with high-quality plastic housing and ferrite core for reliable, long-lasting performance.

The Ceedmon 20 Pieces Clip-on Ferrite Ring Core set offers a versatile, easy-to-install solution to suppress RF and EMI noise across a wide range of cable diameters (3mm to 13mm). Designed with durable plastic housing and magnet ferrite cores, these clips ensure long-lasting interference reduction for your power, USB, audio, and data cables—perfect for professionals seeking a clutter-free, high-performance workspace.

Specifications

ASIN	B07CWCSNW9
Best Sellers Rank	#147,337 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #215 in Cables & Adaptors
Brand Name	Mateda
Colour	Black
Country of Origin	USA
Customer Reviews	4.2 4.2 out of 5 stars (2,567)
Enclosure Material	Plastic
Indoor Outdoor Usage	Indoor
Installation Type	Clip On
Manufacturer	Ceedmon
Manufacturer Part Number	FR1
Model Number	FR1
Number of Packs	1
Number of Pieces	20
Style Name	Industrial
UPC	797646534142
Unit Count	20 Count

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KD 15.22

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In stock

Sold byAmazon KUWAITDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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