AirCell ST 3100, Installation Manual

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4.7.1.2. Audio Level Adjustments (Revision N and later)
Handset Volume Trim Level, Audio Panel Side Tone Adjustment, and Mic Bias
1. The ST 3100 audio level adjustments are set by the factory to mid-range and in most installations
will not need to be altered in the field. The AirCell
®
ST 3100 Transceiver incoming audio
adjustment allows Handset A, B and C to be independently adjusted using the 14-turn
potentiometer. The factory sets the 14-turn potentiometers to a mid-range setting. These
adjustments are minor volume adjustments that don’t adjust from a minimum to a maximum
volume level. The Audio Panel side tone level and volume trim level are also adjustable. These
adjustments change the audio level out of the Audio Panel (A/P). The AirCell
®
ST 3100
Transceiver also provides a microphone bias level through the Audio Panel. This is an ON/OFF
Bias logic function enabled by a jumper.
2. The Handsets are identified by the letters A (HSA), B (HSB), and C (HSC) in the wiring
diagram. On the top of the Transceiver, there is an access panel to the audio level adjustment
potentiometers which are also identified A, B, and C. Caution: the cover screws are not
captive and can be easily lost. Adjust the sum of the audio from the other Handsets to match
the level of an incoming call or to the level desired. To increase the volume level, turn
clockwise. To decrease the volume, turn counterclockwise.
3. Use the additional potentiometers in the top of the Transceiver to adjust the Side Tone
transmit audio level from the Audio Panel (A/P SIDE) and the Volume Trim (VOL TRIM)
receive audio level to the Audio Panel. These are 14-turn potentiometers and set to mid-range
by the factory.
Note
These adjustments are minor volume adjustments that don’t adjust from a minimum to a
maximum volume level.
S/
N
:
ACCESS DOOR
SEE ACCESS DOOR VIEW
Figure 4.4. ST 3100 Transceiver (Top View) (Revision N and later)
Caution
The access door screws are not captive and may be easily lost.
Testing and Setup
Page 4-6
Section 4
800-10680-C, May 2007