This page explains the use of multiple microphones (channels) and radio interference.

Within the receiver, there is a component known as the tuner. Each tuner is configurable to a specific channel. Some receivers have the capability to accommodate multiple tuners. For instance, a receiver with 2 tuners can be configured to 2 channels simultaneously. Additionally, the tuner may be an optional component, referred to as a "Tuner Unit."

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​Multiple Channel Use and Interference

To use 2 transmitters (such as microphones) in the same location, 2 channels are necessary. This implies that 2 tuners are required.

If the two transmitters transmit on the same channel, they will interfere with each other, leading to noise output from the receiver.

​For example, as illustrated in the left figure, even with only one receiver, if there are two tuner units inside, and two different channels are set, reception will be possible without any issues. This is essentially identical to the diagram in the upper left, emphasizing the relationship between the transmitter, tuner, and channel.

Next, let's consider a scenario where the number of transmitters and tuners is not the same.

It is possible to receive the signal from one transmitter with two tuners.

Of course, signals transmitted from two transmitters cannot be correctly received by only one tuner.

“Interference”ed Sound

What are the consequences of interference? What type of sound is produced by the receiver (tuner) in the presence of interference? ...These are sounds we don't want to hear on site.

This is a file that records the audio output of the interfered receiver. This is one of various symptoms. The noise is generated, and the voice saying "Check One, Two" becomes choppy.