On Thu, 04 Nov 2004 00:14:26 GMT, Jerry wrote:

Would it be best to run a coax from
Room 1's unused outlet through the wall to my main media room and have
no additional loss for one of my recording devices?

Hi Jerry,

Don't make things difficult, just spend the big bucks for the high
price spread.

Also, I want to make the best choice for the existing 2-way split in the
main media room. What's the difference between...

- 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

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

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?

What would be the difference in having a solder back or an epoxy?

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?

What would be the difference in having a solder back or an epoxy?

A splitter which has a solid (or completely seam-soldered) metal
enclosure is going to be more RF-tight than one which simply has a
poured-epoxy or plastic back. The sealed-metal variety will keep the
cable-TV signal from leaking out, and will keep other signals from
leaking into the cable feed.

This is beneficial for several reasons, all having to do with the fact
that many cable-TV channels use frequencies which are not authorized
for TV-broadcast use - they're assigned to other radio services
(police, fire, aircraft, amateur).

Signals leaking out of a cable-TV wiring plant (e.g. from a poorly
built splitter, or an unterminated port on a splitter or junction box)
can interfere with these other radio services. Similarly, a nearby
transmitter operating on these frequencies can leak into an open port,
mix with the cable-TV signals, and cause video or audio distortion or
interference.

Cable-TV companies are required by the FCC to keep their wiring plants
"tight", and they usually run "sweeps" of residential neighborhoods
looking for signal leakage. If they find it, they'll either fix the
wiring fault (if it's outside the building), or require that the
building owner or tenant fix the problem as a condition of continuing
to receive cable TV service.


--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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