Operator's Manual

Table Of Contents
14221-1800-2050
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5.17.3 The Effect of Distance from the Microphone
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 Primary versus Secondary Microphone
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.
5.17.5 When using a Self-Contained Breathing Apparatus (SCBA) Mask
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.
5.18 PTT OPTIONS
The radio can be programmed via RPM2 with one of the following PTT options:
Radio and Accessory - In this mode, when the radio is PTTed the audio source will correspond
with the PTT source.
If the source of PTT is radio, the audio is routed via the radio microphone.
If the source of PTT is an external microphone accessory, the audio is routed via the
external microphone accessory.
Accessory Only - Any PTT input will have the audio routed through the external microphone
accessory.
The Bluetooth Speaker Mic is unaffected by this setting.
PTTing the Bluetooth
Speaker Mic always results in audio being routed via the Bluetooth Speaker Mic.
NOTE