[mythtv-users] HDTV antenna quandry

Brian Wood beww at beww.org
Wed Apr 25 15:05:03 UTC 2007


Boleslaw Ciesielski wrote:
> Rich Osman wrote:
>> The splitter will add loss, a two-way  
>> splitter is half the signal level even when used as a combiner.
> 
> Is this really true? I thought that say a 2-way splitter has a 
> "theoretical" loss of 3dB (half the signal) plus an "imperfection" loss 
> of 0.5-1dB for a total loss of 3.5-4dB on each leg. When used as a 
> combiner the theoretical part of the loss would not apply, leaving only 
> the 0.5-1dB loss which is much less than half a signal. Is this incorrect?

It's more or less correct, at least as an approximation, and assuming
that phasing effects can be ignored.

Obviously if the signals are out-of-phase you could wind up with
absolutely nothing, minus the insertion loss.




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