User manual

MR-202/MR-204 Two- and Four-Channel Headset Stations Clear-Com Intercom Systems

Rev. B

• Talk Indication—The associated Talk lamp will illuminate green when

the Talk function is activated.

2—Call Button and Lamp

Pressing the Call button will send a call signal on the selected channel. All the

call lights on that channel will then flash. Call signals can also be sent while

talking if required. The Call lamp will light while the Call button is pressed, or

whenever a call signal is present on the selected channel.

3—Intercom Level Control

Turn this control to set the listen level required on the headset.

4—Sidetone Control

Sidetone is the level of the operator’s voice that heard while talking on the

intercom. Setting a comfortable level of sidetone will ensure that the intercom

line sounds alive and also helps modulate the operator’s voice relative to

other voices on the line.

Use the following procedure to correctly set the Sidetone level control.

1. Set the Intercom Level control to a comfortable level by having

someone talk to the operator from another station.

2. Press the Talk button and speak into the microphone while

turning the Sidetone control slowly back and forth until you hear

your voice at a comfortable level in the headset.

Note:

Do not force the trimpot past its stop points. This will damage it.

5—Channel Switch

This switch selects the intercom channel (A, B, C, or D) on which the headset

station is active.

6—Headset Connector

The headset connector is located on the front panel. All Clear-Com headsets

are recommended for use with the MR-202 or MR-204. The Clear-Com PT-4

Push-to-Talk Microphone or the HS-6 Telephone Handset will also plug into

the headset connector. The following is a description of the characteristics of

a suitable headset:

• Mic Type—Dynamic; 150 to 400 ohms impedance; -55 dB output level

• Headphone—Dynamic; 50 to 2000 ohms impedance.

The wiring of the headset is to be as follows:

• Pin 1—microphone ground (shield)

• Pin 2—microphone hot

• Pin 3—headphone ground

• Pin 4—headphone hot.