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=== Model 381 ===This is a SD (Standard Definition) satellite receiver with HD capabilities for over the air signal. This satellite receiver has a built in Digital TV Receiver for broadcast TV. The 381 is the same as a Model 811, less HD satellite capability. Dish Network describes this strange receiver as "A standard definition satellite receiver with the added benefit of being able to view analog/digital (HD) over-the-air broadcasts using HD outputs.[[Image:dishnetreceiver381.jpg]]=== Model 922 HD DVR ===Connects two independent TVs for viewing at home, plus watch live and recorded programming on your computer or mobile device. Includes 1 terabyte hard drive. [[Image:dishnetreceiver922.jpg]]The term "dual" was already established to refer specifically to an LNB that can receive from a single satellite and that has two outputs for two receivers. So when Dish Network wanted a name to refer to their single housing that contained LNBs for pointing at two satellites they used the word "Twin" with an uppercase T. Twin is a name created by Dish Network with a different meaning than the word twin (lowercase t). There is no such thing in the Dish Network word as a Twin dual LNB unit.The term "dual" was already established to refer specifically to an LNB that can receive from a single satellite and that has two outputs for two receivers. So when Dish Network wanted a name to refer to their single housing that contained LNBs for pointing at two satellites they used the word "Twin" with an uppercase T. Twin is a name created by Dish Network with a different meaning than the word twin (lowercase t). There is no such thing in the Dish Network world as a Twin dual LNB unit.