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3.8.4 Primary versus Secondary Microphone
3.8.4.1 Without a Speaker Microphone Attached
The primary microphone is located on the front of the radio and the secondary is on the back of the radio.
See Figure 3-6 for the location of these microphones.
Figure 3-6: Without a Speaker Microphone Attached
3.8.4.2 With a Speaker Microphone Attached
When a speaker microphone is attached, the radio electronically switches over to use the radio’s front
microphone as secondary. The microphone on the attached speaker microphone becomes primary (see
Figure 3-7).
Figure 3-7: With a Speaker Microphone Attached
3.8.5 When using an SCBA Mask
When using the 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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