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Just curious of this would work...can I hook up a Hughes E-86 HD box (made for DirecTV and OTA) to a regular Comcast cable line (connected to the antenna in jack) and receive HD via the cable? Or is it only limited to the HD boxes that Comcast provides?
 

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From Miatasm's FAQ on the DCT5100:


Can the DCT5100 decode OTA HD programming?



Yes & No. The DCT5100 can only decode HD programming that your Cable Company sends over the cable lines, which could include some OTA channels, but you CANNOT connect an OTA Antenna to the DCT5100 and have it pick up HD Broadcasts. The reason for this is that the modulation standard for HD broadcasts is 8VSB (Eight Level Vestigial Side Band). Cable Companies use QAM (Quadrature Amplitude Modulation). The 5100 is only able to decode QAM.


More about the DCT5100: http://www.cjhengineering.com/5100faq.htm
 
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