[mythtv-users] How to best deal with Comcast's "Improved" Lineup?

Brian Wood beww at beww.org
Wed Jul 21 20:22:54 UTC 2010

On Wednesday, July 21, 2010 01:34:07 pm Douglas Peale wrote:

> You won't know until you try, but trying is really cheap. just get a 2 way
> splitter and use that to combine the signals, and give it a try. If you
> don't already have a splitter, it will cost you about $5.

It would be better to use directional couplers to do the combining, and not hybrid splitter/combiners, as you would get 
much better isolation between the two devices being combined. The isolation spec on hybrid combiners is based on the 
assumption that each port is seeing precisely 75 ohms, while with DCs the isolation isn't dependent on precise 
termination, and the isolation is better in any case.

The problem is that you would lose more signal by using DCs. I don't know what level the devices put out, it would have to 
be at least +10 dbmv. or more, assuming 8 db. loss DCs.

Might not work well, due to insufficient output levels, I just wanted to point out that DCs make a much better combining 
network than hybrid splitter/combiners do.

A couple of DC would run about $10 or $12, more than a splitter, but technically a better solution.

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