Port to port isolation is typically in the upper teens to mid twenties,
depending on manufacturer and frequency. The 90 and 130dB you see in
those specs (that appears to be about the only spec they give, in
addition to bandwidth) is the RFI immunity. One of the specs they don't
list is the return loss. Are the 90dB ones solder backed or epoxy? Are
they made utilizing a PCB design, or are the components just soldered
together and stuck in the housing?

Like Richard wrote, fork out the extra couple of bucks and get some real
splitters. One good place to get some is
http://www.cencom94.com/gpage.html. They're made by CATV industry
manufacturers and used by cable companies. Holland is Comcast approved
and PDI is widely used by Time Warner.


CIAO!

Richard Clark wrote:
- 1GHz 90dB 2-Way F-Pin Splitter
- 1GHz 130dB 2-Way F-Pin Splitter
- 2GHz 90dB 2-Way F-Pin Splitter DC Passing


DC passing would suggest that all these are rated for satellite TV
systems (hence the high frequency rating). The dB ratings are port
isolation (one side interfering with the other). Choose one with
highest number (either frequency or dB or both) in anticipation of
future needs - price is hardly an issue with these components.

73's
Richard Clark, KB7QHC