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    DVR 510 problems w/ locals on 121

    I'm an SBCA Cert. Installer, and every single costumer I install a 121SD Type I w/a 510 (including myself...), the locals keep going in and out, freezing, loosing signal, etc.. does anybody have a clue about what's going on???? :confused: P.S.: the signal strenght on 121 it's about 85/95