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  1. J

    Notch filter question

    Hi, I live in a condo. Comcast gave us channel 90 to sent CCTV(front door) to 24 units. For some reason they are sending something on channel 90 now. and we can't see the CCTV. They came out but did nothing except say hummmm. We where thinking about using a 7822c notch filter everyone has...
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