User manual

KB-211/KB-211GM Two-Channel Speaker Stations Clear-Com Intercom Systems

Rev. A

• Pin 4—headphone hot.

The microphone and headphone wiring in the headset cord must be

individually shielded.

Note:

Do not connect Pins 1 and 3 together. Headset extension cords or

headset ”Y” cables are not recommended because they may increase

crosstalk between channels.

11—Panel Mic Connector (KB-211GM only)

Clear-Com recommends the GM-9 (9 in. long) and GM-18 (18 in. long) plug-in

panel microphones be used with the KB-211GM. Both are the electret type.

The 1/4-in. phone jack on the microphone mates with the Panel Mic

receptacle on the KB-211GM’s front panel.

To install a GM-9 or GM-18 microphone:

1. Remove the plastic plug from the jack, if present.

2. If a set screw is present in the microphone-mounting flange,

check and unscrew it to make sure it is clear of the threads in the

bushing.

3. Screw the microphone into the bushing and tighten.

4. Optional: Replace the set screw supplied with the gooseneck

microphone on top of the microphone-mounting flange and turn it

clockwise to lock the microphone in place.

12—VOX Control (KB-211GM only)

When the panel microphone is selected on the KB-211GM, the VOX control

should be adjusted for proper operation. This control is located to the right of

the panel microphone connector and is recessed slightly into the front panel.

Use a narrow, flat-blade screwdriver such as a "greenie" or "tweaker" for this

adjustment. When the adjustment is correctly set, the Talk lamp will be red

when speaking into the panel microphone and will be green when hearing

audio from the speaker. Turning the control clockwise makes the KB-211GM

more sensitive. The VOX feature can be disabled by turning the VOX control

fully counterclockwise.

Internal Adjustments and Connections

The controls and connectors inside the KB-211 are shown in the following

figure and described by the following text. The controls can be accessed

without completely removing the panel from its wall box or V-Box enclosure

by removing the top two screws and loosening the bottom two screws a few

turns. The panel can then be leaned out from the wall to make the controls

accessible as shown in the lower view of Figure 2 on page 7.