I have a Direct TV HD set-up and want to add my off-air antenna and diplex it down same cable. I can't get my local channels in San Diego, so I am pointing at LA. Need a pre-amp for the Antenna (Winegard AP-4700). Now, since the sat. dish needs a power pass and the pre-amp needs a power pass I obtained a SVI 35-SDX100DC Power pass Diplexer - with power pass to both sat and antenna. Will the different voltages on each link be a problem? If so how do I solve this problem?