Plastic on cable, UHF flashback prevention?

In summary, the blob of plastic on the mouse cable is called a ferrite core or torroid and is used to help lower RF emissions from the PC and mouse by acting as a filter for parasitic common-mode signals. This is to comply with FCC regulations on unintentional RF noise from electronic devices.
  • #1
philip041
107
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On my mouse cable, there is a blob of plastic which coils the wire once around, I don't know what the material is that encompasses it.

Someone said it was for to stop UHF flashback. What does this mean? I also have it on loads of electrical appliances..

Cheers

Philip
 
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  • #2
Woops, I say plastic but I actually don't know if it is at all...
 
  • #3
philip041 said:
On my mouse cable, there is a blob of plastic which coils the wire once around, I don't know what the material is that encompasses it.

Someone said it was for to stop UHF flashback. What does this mean? I also have it on loads of electrical appliances..

Cheers

Philip

It is a ferrite core or torroid. The cable is wrapped around it (or just passes through it once) to help lower RF emissions from the PC and mouse.

It's like a filter, a low-pass filter. And because of the way it is around the cable, it does not affect the differential mode electrical signals in the cable (which do the work, like track the mouse), but only filters the parasitic common-mode signals, which can use the cable as an antenna and radiate away, and cause interference with broadcast TV and radio. The FCC has rules about how much "unintentional RF noise" you can put out of PCs and such.
 

Related to Plastic on cable, UHF flashback prevention?

1. What is the purpose of plastic on cable in UHF flashback prevention?

The plastic on cable serves as a protective layer to prevent UHF flashbacks, which are electrical discharges that can occur between the metal components of a cable. This can help to prevent damage to the cable and any connected devices.

2. How does plastic on cable prevent UHF flashbacks?

The plastic acts as an insulator between the metal components of the cable, preventing electrical current from passing through and causing a UHF flashback. It also helps to dissipate any heat generated by the electrical current, further reducing the risk of flashbacks.

3. Is plastic on cable necessary for UHF flashback prevention?

While plastic on cable is not always necessary for preventing UHF flashbacks, it is highly recommended as an added safety measure. Without it, there is a higher risk of flashbacks occurring and potentially damaging the cable or connected devices.

4. Can plastic on cable be used for all types of cables?

Yes, plastic can be used on a variety of cables, including coaxial cables, HDMI cables, and Ethernet cables. It is especially important for cables that are used for high-frequency signals, such as UHF signals, as these are more prone to flashbacks.

5. How can I tell if my cable has plastic for UHF flashback prevention?

Most cables that are designed for use with UHF signals will have a plastic coating or sheath. You can also check the specifications or packaging of the cable to see if it specifically mentions UHF flashback prevention. If you are unsure, it is best to consult with the manufacturer or a professional to determine if the cable has the necessary protection.

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