Spoiler
I'm really curious to hear peoples thoughts on this.
They act as common mode current chokes. The serve both to reduce emissions of, and reduce susceptibility to, RFIGara wrote:Do Ferrite beads on analog video cables have any benefits or disadvantages? Why are they on so many officially released cables?
They are on a lot of official RGB Scart cables for various systems that have Ferrite beads. I've also seen them on various Extron BNC cables, but only their "Mini High Resolution" line. The thicker "Super High Resolution" stuff doesn't have them. Would that indicate the filtering a Ferrite core is supposed to provide is only useful on cables with less shielding?Spoiler
I'm really curious to hear peoples thoughts on this.
maxtherabbit wrote: They act as common mode current chokes. The serve both to reduce emissions of, and reduce susceptibility to, RFI
This has been my approach. I had some, so I figured why not. I've always been curious to know if they actually do anything.kitty666cats wrote: I’d say it is worth picking up a cheap bag of various sized ones if you ever find yourself finishing a setup you know you are gonna have assembled for a good long while. The kinda thing you buy with the remnants of an Amazon gift card or whatever
Yes. That's the only time they would benefit you. The main reason that manufacturers install them is for FCC compliance with respect to RF emissions. That doesn't benefit you as the user, but theoretically may benefit those around you trying to work weak signal radio contacts.Gara wrote: I personally see no difference in my setup by clamping or unclamping one from a video cable. If I lived in a radio station next to a cellphone tower then would that be different result?
I believe it was Panasonic plasmas that used to bundle clip on ferrite beads for the power cables.Syntax wrote:Clip on ferrite cores don't really work. Waste of money.
For a ferrite core to be effective you need one that is an unbroken ring, and your wires need to loop around that at least once. (3x more effective)
Anything else is snake oil.
A while back I had a cheap car dash cam that introduced audible noise to the radio. A clip on ferrite bead at either end of the power cable reduced this noise significantly. I'm sure the type of installation you suggest is better, but "anything else" may still be of benefit in certain scenarios (in my case a cheap, easy and effective fix).Syntax wrote:Clip on ferrite cores don't really work. Waste of money.
For a ferrite core to be effective you need one that is an unbroken ring, and your wires need to loop around that at least once. (3x more effective)
Anything else is snake oil.
Konsolkongen wrote:I believe it was Panasonic plasmas that used to bundle clip on ferrite beads for the power cables.Syntax wrote:Clip on ferrite cores don't really work. Waste of money.
For a ferrite core to be effective you need one that is an unbroken ring, and your wires need to loop around that at least once. (3x more effective)
Anything else is snake oil.
In my previous apartment I had an issue where every time the fridge would start the TV signal would drop out. I made a loop on the coax cable and clipped the ferrite bead on and it helped a lot. Almost completely eliminated the problem to the point where it was just a brief hick-up.
I later realized that I could get fully shielded plugs for the coax. That of course did fix it, without the ferrite bead. But they do work to some extend.