Using Noise Cancellation; The Effect Of Distance From The Microphone; Primary Versus Secondary Microphone; When Using A Self-Contained Breathing Apparatus (Scba) Mask - L3Harris XL Extreme Series Operator's Manual

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14221-1800-2050, Rev. G

5.17.2 Using Noise Cancellation

When using the noise cancellation feature, observe the following:

Verify NOISE CANCELLATION is enabled (see Section 5.17.1).

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Talk within two (2) inches of the primary microphone (see Figure 5-5).

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Ensure the primary and secondary microphones are not covered. See Section 5.17.4 for more

information on the primary and secondary microphones.

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Speak clearly, loudly, and with authority.

In noisy environments, it is o.k. to yell into the radio. The radio can handle loud input levels.

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Unlike a normal microphone system, noise cancellation makes the level of your voice diminish

quickly as you move away from the radio. The radio starts to see your voice as surrounding noise.

Whereas you may be comfortable speaking up to a foot away under normal operation, noise

cancellation requires that you hold the radio close.

5.17.4.1 Without a Speaker Microphone Attached

The primary microphone is located on top of the radio and the secondary is on the bottom of the

radio (refer to Figure 5-1 for microphone locations).

5.17.4.2 With a Speaker Microphone Attached

When a speaker microphone is attached, the radio electronically switches over to use the radio's

top left microphone as secondary. The microphone on the attached speaker microphone becomes

primary.

When using an SCBA mask, the primary microphone can be held directly against the voice port.

If the SCBA has a voice amplifier, the same rule applies. Ensure that the secondary microphone

is uncovered. If possible, point the secondary microphone toward the noise source.

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