Injecting IR into CATV

["E. Lee Dickinson" <ltek1@xxxxxxxxx>]

Is there a filter I can put on a coax splitter so an injected IR signal
doesn't get attenuated?

Working on this project at my mom's house:

She has a Tivo in her bedroom which she would like to watch in the
Living room.  I purchased a Modulator with built in IR "processor," IR
targets, injector for the living room, etc.

The first problem was that I could not get the video to show up until I
put an extra splitter outside the house, so that the bedroom and living
room are on their own splitter, which is then attached to the main
splitter which feeds the house. Slight loss in signal quality, but at
least the modulated chanels now show up.

The problem I have is with the IR. First, I had to power the IR target
locally. The modulator was supposed to be able to power it over the
coax, but  I guess it's just too far away. Oh well, at least it works.

However, it only works was long as the Tivo in the bedroom is not
connected to cable. There is another splitter in the bedroom -- I need
CATV into the tivo, and the modulator has to connect back to the wall
as well to inject the new channel.  I had a nice fancy 1ghz splitter,
that didn't work. Dropped back to an old one I had lying around, it
works as long as the tivo CATV is not plugged in. As soon as I plug it
in, the IR stops working.

If I were working on a DMX or a video system, I'd say the input
impedance of the Tivo is too low, and it's sucking the IR signal out of
the cable, attenuating it to the point the modulator can no longer use
it.

We have the same problem with X10 signal suckers, and solve it with
filters.

Is there a filter I can put on the splitter so the injected  IR signal
doesn't get attenuated?

Thanks,

:Lee