Posted: 7/18/2010 4:21:05 PM EDT
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My Arris cable modem is causing bad interference on HF, mostly around 40 meter band and lower. I have put ferrite cores on every cable going into it and it helped very little. The only way I can get the interference to go away is to unplug power to it. Any ideas on how to fix this? |
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Quoted:
It sounds like you have a leak somewhere in the cable system, either in your home or nearby in the outside plant. If it was a cable "leak", the problem would still remain when his modem was unplugged (due to "leakage" from other modems connected to the cable). As A_Free_Man mentioned, wall warts that use switching power supplies are notorious RFI generators. If you could temporarily power the modem with a linear power supply of some sort instead, it would positively identify (or rule out) the switching wall wart as the cause of your RFI problems. |