Cat-V Interference help

[Dispatrick]

I've located the source of interference in my home on my scanner in the 25-54MHz band area to be a cat-v cable running from my modem to my basement wifi extender. I confirmed it by trial and error, unplug-plug of different devices and other strands of wire in my home. My guess is the reason this particular strand of wire is causing interference is A. The wire has a cut in it somewhere and is leaking signal or B. It's a cheap piece of wire and the outer shielding is not thick enough and is leaking signal.

Does anyone have any suggestions on how to eliminate the interference? I've added a few ferrite chokes and no success, should I add more or is this even a solution in the first place? Is their anything else I can do before I replace the wire?

Thanks!

 

[krokus]

I've located the source of interference in my home on my scanner in the 25-54MHz band area to be a cat-v cable running from my modem to my basement wifi extender. I confirmed it by trial and error, unplug-plug of different devices and other strands of wire in my home. My guess is the reason this particular strand of wire is causing interference is A. The wire has a cut in it somewhere and is leaking signal or B. It's a cheap piece of wire and the outer shielding is not thick enough and is leaking signal.

Does anyone have any suggestions on how to eliminate the interference? I've added a few ferrite chokes and no success, should I add more or is this even a solution in the first place? Is their anything else I can do before I replace the wire?

Thanks!

Cat 5 is typically unshielded, unless you bought shielded cables.

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[jonwienke]

Network cable is generally 4 twisted pairs--essentially 4 ladder lines in one cable, with no shielding around them. The RJ45 connector doesn't have anywhere to connect a ground, even if the cable had shielding braid around the twisted pairs. You could try replacing with category 6 cable (Which has the same basic construction), but your best bet is probably to put the cable inside some grounded metal conduit.

 

[Ubbe]

Shielded cat cables have a metal housing over the plastic connector that the aluminum foil are connected to. I get a huge impovement with shielded cat cables even if they are connected to devices that only have a plastic connector without any metal. I even tried short runs of stiff cat7 shielded cables (expensive) that made the interference dissapear completly.

I noted that there now are cat 8 cables available. The higher the cat number the higher the frequency it can handle and have less resistance/impedance, which is important to keep the radiation down.

Standard unshielded cat 5 cable that comes with some routers and modems are totally useless if you have any radio or antennas nearby.

/Ubbe