Are IEM antenna combiners linear on the RF output side? E.g. if my Shure PSM900 RF output is set to 50mW, should I expect roughly the same output out of my Combine4?
What happens if I have 4 transmitters going through the combiner at varying power levels?
I believe you're inquiring about system gain/loss, not linearity (which has a different meaning when discussing RF amplifier stages). Almost all of the combiners sold for use with low power IEM's, IFB's and intercom outbounds are unity gain devices; the input power level per carrier is what will be output per carrier, +/- a dB or so for manufacturing tolerance and input power imbalance. For the most part it doesn't matter if the input power levels are different: The unity gain is on a per carrier basis.
The exception to the unity combiner design is the RAD TX-8 (and TX-8U) which has individual output level selection for each input.
