[mythtv-users] Coax splitters - how painful are they?
brian.phillips at gmx.net
Tue Sep 25 20:12:15 UTC 2007
Guillaume Filion wrote:
> Brian Wood a écrit :
>> A "perfect" two-way splitter would have 3db. loss. Since nothing is
>> perfect in this world, most splitters actually lose 3.5db. per leg
>> for a two-way split, and 7db. for a four-way.
> I think that I remember being told that there's a resistor in the
> splitter to ajust the impedance. That way, a two way splitter would
> give 1/3 of the signal in each leg -- with 1/3 lost in the resistor.
> Is my memory serving me right?
Maybe older ones. But you can match impedances with just 3.5dB per loss.
3dB is a loss of 1/2 the power, so the 3.5dB is just under half the input
power delivered to each leg. If you still have 1/3 power splitters, it's
time to upgrade.
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