Howling Suppression; Audio Toggle; Volume Adjustment Mode - Motorola MTP3100 User Manual

4.7.5.2

Howling Suppression

The howling suppression is a mode increasing the stability of the acoustic feedback loop. The radio
eliminates howling caused by the feedback loop from the receiving radios to the sending radio in
simplex calls. You can toggle the howling suppression during an active call.
To enable this anti-howling function, you can either use the radio menu or the corresponding One-
Touch Button.
4.7.5.2.1
Setting Howling Suppression
Procedure:
1 From the home screen, press the Menu key.
2 Select Setup → Audio → Howling Suppr..
3 Select required setting.
NOTICE: Your service provider can set up the state of the howling suppression on
powering up the radio. Depending on the settings, the radio can either disable the
howling suppression or set the last remembered state.
4.7.5.3

Audio Toggle

You can control audio routing between the speaker and earpiece for any private or group call through
the dedicated Speaker Control key. You can also define through the menu to have all group calls in
high audio or controlled by the Speaker Control key.
4.7.5.3.1
Setting Audio Toggle
Procedure:
1 From the home screen, press the Menu key.
2 Select Setup → Audio → Audio Toggle.
3 Select one of the following:
• Always Loud – The audio sound comes from the speaker (high audio only).
• Spkr Cntrl – The audio goes through the earpiece or the speaker.
4.7.5.4

Volume Adjustment Mode

You can set the volume to Individual or Common. When it is set to Individual, the volume level for
Voice, Duplex, Simplex, Keypad, Tones, and Call-Out can be set per user preferences. When set to
Common, the audio has one setting for all items. The Volume Control Mode is configurable using the
Customer Programming Software (CPS).
The max volume offset (dB) and the volume range (dB) are configurable through CPS (Audio Settings
→ User Profile). The volume control in the radio is divided into 13 steps, from 0 to 14. If, for example,
the vol. range is set to 39, each step on the volume indication bar is 3 dB.
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