Re: Injecting IR into CATV

[nobody@xxxxxxxxxxxx (Dave Houston)]

Wouldn't it be simpler to use an IR2RF extender (e.g. X10 Powermid)?

"E. Lee Dickinson" <ltek1@xxxxxxxxx> wrote:

>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