Gain Control; Change Gain Settings With The Application Setup - RTS WKP-1 Manual

14 Installation

Gain Control

System Diagram depicting gain control
FIGURE 4.
The WKP-1 Industrial Keypanel is susceptible to a feedback squeal due to the placement of the mic in relation to the speaker.
When this occurs a continuous audio loop forms which creates a feedback or squeal. For example, in Figure 4, audio enters the
mic in the WKP-1, goes to the Matrix, then out the speaker on the KP-32. If the mic on the KP-32 is on, the sound emitting
from the speaker may be picked up by the mic and sent back to the Matrix and to the WKP-4, thus creating an audio loop.
However, if at some point within that loop a break occurs, due to the half-duplex mode or gain control settings, the loop cannot
complete and the feedback is not heard.
There are several ways to reduce audio feedback:

Change Gain Settings with the Application Setup

•
Run in Half-Duplex Mode
•
Talk Latch Disabled
•
Change Gain Settings with the Application Setup
There are several different points within the system setup where the user can set the gain control so as to limit the mic or
speaker sensitivity to reduce the occurrence of feedback. The gain control can be modified in the WKP-1, in the Matrix on the
crosspoints (using AZedit), or in the keypanel on the other side of the Matrix. For example, if the purpose of the industrial
keypanel is to overhear work being done in a warehouse, which may or may not be close to the speaker, the sensitivity of the
speaker must be set to pick up audio from a distance. And, since the main use of the keypanel is listen, the mic gain control is
set low so as to not allow the speaker to pick up any audio.
For more information on how to set the gain control within the WKP-1, see "Gain Control" on page 14.
WKP-1