AVS Forum Special Member
Join Date: May 2007
Location: Taylorsville, UT
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The input level specification for cable modems is-15 - +15dBmV. You want to stay within ~-10 - +10, though, to allow for a little signal fluctuation in the cable system. Cable modems perform equally well anywhere within that range -- +10dBmV is no better than -10dBmV. Output needs to be ~+50dBmV or below.
While insertion losses do vary a little with manufacturer, they are typically within 0.2-0.4dB of one another. Insertion loss also increases with frequency.
Extreme 2-way splitters lose 3.5dB on the low end and 3.9dB on the high end. By comparison, both Holland and PCT lose 3.3dB on the low end and 3.8dB on the high end.
Other specs to be taken into consideration when looking at splitters are port-to-port isolation and return loss. In both of those, the higher the number the better. Of the 3 manufacturers mentioned, PCT has the best isolation and return loss specifications, with Holland coming in 2nd and Extreme being 3rd.