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Originally Posted by Ranch TV
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I'm just a retired phone guy... a bit more than a third of my career was spent serving TV and radio broadcasters, delivering broadcast quality private line services. Our crew also maintained several company base stations, including paging, pre-cell-phone mobile phone systems and internal company two-way radios. The last dozen or so years were spent installing and configuring routers and switches for Internet and private customer networks.
The links you've posted are the commercial equivalent of the SiliconDust tuner I mentioned. They are in essence TV tuners that output data or standard definition analog signal for re-modulation by a similar module. These are examples of what a cable company might use. You would need one demodulator for each channel + a modulator. You also need the mounting rack and power supply along with a multi-input combiner that would accept the signal from each modulator.
Here is an example of a cable system modulator unit, it does not use ATSC/8VSB format, but the QAM digital format common to cable TV networks.
http://www.techtoolsupply.com/Produc...roductCode=PQM
This equipment requires some commercial grade test equipment to be able to accurately set signal levels. If not adjusted to within a few dB of the ideal level, there will be interference between channels. A system supporting a dozen channels could quickly cost $20,000 by the time you've purchased some used test gear and the various components.