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Re: Multiple Antennae on IEM transmitterTo expand on the concept, it is possible to create a "different RF environment" between the primary IEM TX antenna (for the performers on stage) and a secondary antenna by the monitor mixer, and essentially Jens has the right idea. (I do recommend, and have used the Spotlight for this application. Do note I am a consultant to RFVenue.) Given that we're currently dealing with FM systems, and its characteristic capture ratio, all that's required is a consistent difference of >12dB between the two TX signals at the receiver's antenna to eliminate phase distortion. Thus if the primary antenna's signal is weak enough at the monitor position to actually drop out, this would mean the average signal strength is likely hovering around -80 to -85dBm. Using a 2-way way splitter (an unequal directional coupler is even better) and placing a small whip antenna down low amongst the electronics racks right by the monitor mixer's knees or ankles, or the Spotlight on the floor, will provide more than enough signal strength to reliably surpass the 12dB difference needed to mitigate phase distortion at the monitor mixer's IEM pack while providing sufficient signal to avoid drop outs, yet will completely fall into the noise floor by the time it hits the near side of the stage.
Re: Multiple Antennae on IEM transmitter
To expand on the concept, it is possible to create a "different RF environment" between the primary IEM TX antenna (for the performers on stage) and a secondary antenna by the monitor mixer, and essentially Jens has the right idea. (I do recommend, and have used the Spotlight for this application. Do note I am a consultant to RFVenue.) Given that we're currently dealing with FM systems, and its characteristic capture ratio, all that's required is a consistent difference of >12dB between the two TX signals at the receiver's antenna to eliminate phase distortion. Thus if the primary antenna's signal is weak enough at the monitor position to actually drop out, this would mean the average signal strength is likely hovering around -80 to -85dBm. Using a 2-way way splitter (an unequal directional coupler is even better) and placing a small whip antenna down low amongst the electronics racks right by the monitor mixer's knees or ankles, or the Spotlight on the floor, will provide more than enough signal strength to reliably surpass the 12dB difference needed to mitigate phase distortion at the monitor mixer's IEM pack while providing sufficient signal to avoid drop outs, yet will completely fall into the noise floor by the time it hits the near side of the stage.
