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Because it does not have a ATSC nor a Quam tuner in it. Just a regular tuner. As it says HDTV ready. This meant back when you bought it that it will receive HD when a hd cable box is used and connected to the DVI or the Component input in the back. This was a low end set at the time. It will still receive regular cable without a box.
Your Hitachi 51UWX20B is an HDTV-Ready TV. No Digital Tuner. HDTV-Ready means that your TV set is capable of displaying analog and high-definition digital pictures, but without a digital tuner, it cannot receive the digital signal. An HDTV-Ready requires an external high-definition TV receiver (digital tuner) in order to receive HDTV signals. These external receivers can be called an HDTV Tuner, set-top-box, decoder or DTV Converter Box . So you will be required to purchase a converter box to receive over the air programming from an external antenna.
you will need a Hd input. In the uk there are 3 ways to obtain this
1 sat Box that will receive HD
2 Freebox that will receive HD
3 Blue ray Dvd Player
Note not all ditgal transmitters at the present time do not transmitte HD and will not do so untill the DSO is complete in2012.Hope this will be of help.
Sorry to say, your HDTV-Ready - Requires separate receiver to view HDTV signals. SDTV (Standard Definition) - has built-in digital receivers/decoders
and do not require the purchase of any separate components in order to
display digital signals. It provides lower image quality than EDTV or
HDTV, but higher image quality than analog TV. SDTV is displayed using
an aspect ratio of 4:3. I hope this helps and good luck. Please remember to vote if this was helpful in any way. Thanks.
Someone did not explain to you what HDTV "Ready" means. It means you do not have a ATSC tuner in it to except over the air digital signal. The only way you will get digital reception is either from a HD Cable box with RGB outputs that plug into your RGB inputs, or being on Satellite connecting the same way. Seven years ago manufacturers never made it easy to understand and Salesmen only made it worse. So in short the term HDTV Ready meant it can, with a BOX.