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1.2.
The Intercom Control Unit, or ICU, is the individual's link to the intercom system and the radios
connected to the intercom system's IMU. The ICU provides the user with:
1.
Jack for a headset with a U-174/U connector
2.
Personal earphone volume control
3.
Personal radio selector switch
4.
INTERCOM push-to-talk button to talk with others in the vehicle
5.
RADIO push-to-transmit/talk button
The user talks through the intercom by pushing the INTERCOM P-T-T button or transmits over a
selected two way radio by using the RADIO P-T-T button (these transmissions are also heard by all
intercom users). All AMCVIS users (intercom and radio) hear all voice communications.
All five users can be talking on the intercom or radio at the same time.
All switches and controls are protected by guards.
The volume control permits the user to adjust the listening level in his headset from a preset minimum
volume to maximum. This is an individual control and will not affect the listening level of the other
users.
The system accommodates most types of dynamic and 2-wire electret type microphones and headset
speaker impedances from 50 to 2000 ohms.
INTERCOM CONTROL UNIT (ICU):
FIGURE 4: INTERCOM CONTROL UNIT (ICU)
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