Quote:
Originally Posted by O-O
Piggie or anyone, when do phasing problems come into play when using a splitter combiner for antennas? Is it when both antennas have a pre-amp. 
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There are a lot of places you can boo boo and run into trouble with splitter combiner.
Most of them don't involve a pre-amp.
One is when stacking antenna to combine a VHF and a UHF antenna in fringe conditions, when for $10 you can use a UVSJ and gain 3db, or the equivalent of doubling the length of the boom or elements of both antennas.
When you don't use the same length coax cut from the same piece when stacking two identical antennas to increase gain.
Pointing two antenna on the same band in different directions to remove the need for a rotor but by pure chance aiming on into a reflection of a station the other antenna is trying to receive (mega mulit path). It's trial and error anytime you combine two antennas on the same band that you are not trying to stack.
There are mistakes on where to place an amp in a combined system, which I plan to cover in another thread.
Did I even answer your question? If you have a specific situation let me know.