We are going to be looking at multi-path interference, and how to resolve this problem.
Multi-path interference is when the radio signals reach the receiver at different times. This can cause fading. Multi-path interference happens when waves bounce off of reflective surfaces, like walls. It is important to note that the polarity of a wave changes 180º each time it is reflected off a surface. Multi-path interference is often created as performers are in motion with their wireless mics, changing the angle of the transmitter.
Most systems battle this problem through diversity receivers. Diversity receivers use two antennas, with the receivers switching to the one picking up the stronger signal. The logic being that it is very unlikely that both will be experiencing a null at the same time. An easy way of trying to combat multi-path interference with a diversity receiver is by just relocating the receiver system to a more optimal location.
While addressing multi-path interference, a problem that can arise with diversity receivers is that a poor signal will often cause the system to rapidly switch back and forth between antennas, leading to quick dropouts and “swooshing” sounds caused by switching noise.
An Advanced Solution!
If you are having problems with the built-in diversity receiver, a great investment is in a good external antenna. RF Venue makes a fin antenna that combats polarization, and reduces dropouts, and that “swooshing” sound. Their Diversity Fin is a multi-purpose antenna for wireless microphones that reduces dropouts using a cross-polarized, hybrid design. It will greatly increase the quality of your antennae switching, and combat polarization.
Thanks for Reading!