Does anyone know if they design diplexers specifically to separate QAM in the clear frequencies and those used by cable internet services? Somebody correct me if I am wrong, but since you can get both cable TV and internet services from the same provider at the same time, I am assuming that their frequency ranges don't overlap. Or are they separated streetside or in the junction box?
And again- correct me if I am wrong, but a splitter would halve the signal strength and introduce loss from interrupting the line, while a diplexer would only cause the insertion loss? I am assuming that the upstream cable modem signals would not be too severely affected even by a splitter since there should be nothing in that frequency range on the other split? Or would there be some kind of reflection issue?
I am thinking of adding a new ATSC TV in the room that currently receives internet service, but ideally, I would like to avoid simply splitting the line to avoid bandwidth problems.