Motorola PMLN6540 Manual page 5

Figure 1.Behind the Head Model
PUSH-TO-TALK (PTT) OPERATION
1. Always switch the radio OFF before
connecting the headset.
2. Attach the audio connector to the radio.
Note: Once the headset has been installed the
radio speaker and the radio microphone
are both disabled. The user must speak
into the headset microphone and use
the headset speaker to listen to
incoming calls.
3. For Push-To-Talk operation, place the
PTT/VOX switch in the PTT mode.
Switch the radio ON. Care should be
taken not to set the volume level too
loud.
4. The flexible boom mounted Noise
Canceling microphone should be
positioned approximately 1.2 cm to 2.0
cm (½ inch to ¾ inch) from the user's
lips. Adjust the flex boom assembly to
this position. Do not twist the Noise
canceling module with windscreen,
either clockwise or counterclockwise to
avoid poor noise cancellation
performance.
5. Press the Ear cup Push-To-Talk button
located at the top of the left ear cup and
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