In this test, you will need to make some loud noises at the microphone, but be able monitor the output of the receiver in a fairly quiet environment. It’s best done with two people. The purpose of this test is to listen to how well the transmitter input limiter can handle audio peaks well above the average level.
Set up the wireless system for an average level so that the system indicates brief peaks at full modulation with a normal voice, with the microphone at a distance of 2 feet from the talker’s mouth. While the talker speaks at a constant level, bring the microphone closer and closer to their mouth. Make sure breath pops don’t get into the microphone when it gets close to the mouth by keeping the microphone to the side of their mouth. If the transmitter has a poor limiter, or no limiter at all, the signal will get louder and then begin to distort as the loudness increases. In a system with a good limiter, the sound will get louder up to the beginning of limiting, and then will remain at a fairly level volume even as the mic is moved closer to the mouth. The character of the sound may change due to the different distances as the mic is moved closer to the talker’s mouth, but the system should be able to handle the higher levels without distortion.
You can also test a limiter by shouting into a microphone, but keep in mind that the character of the talker’s will change as they go from a speaking voice to a shout. This makes this method harder to judge. Some wireless system designs try to prevent overload by having low microphone gain available to the user. This compromise will result in a poor signal to noise ratio when the RF signal gets weak