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These are available from TV equipment suppliers, not very expensive, so probably not really worth building them yourself. Unless you have access to good test gear, it is not that easy to do high frequency RF.
If you have to design one, it must be able to handle the input power. The signal level into the house is anywhere between +15dBmv to -15dBmV per channel and there are about 110 channels in a fully loaded cable system. These signals will generate CSO, CTB, and XM through your amp which will distort your signal. Look on the Mini Circuit's website for their forward cable amp design.
professional cable tv amplifier ic's r made by Motorola, Phillips & NEC.
It is then very easy to make one. But u need good test equipment to tune it. Hope this helps u.
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