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Page Title: Typical MC Unit
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instance, does not want the cabin blasted with calls for individuals to lay down to the spud locker. The BM of the watch is responsible for passing the word; but if he or she is absent and you are required to pass the word by yourself, be sure you know which circuits should be left open, Some parts of the ship have independent MC circuits  of  their  own,  such  as  the  engineers'  announcing system (2MC) and the hangar deck announcing system (3MC). The bull horn (6MC) is the intership announcing system, but it seldom is used for actual communication between vessels. It is, however, a convenient means for passing  orders  to  boats  and  tugs  alongside  or  to line-handling parties beyond the range of the speaking trumpet. If the transmitter switch is located on the 1MC control  panel,  you  must  be  careful  to  avoid  accidentally cutting in the bull horn when you are passing a routine word. The 1MC, 2MC, 3MC, and 6MC are all one-way systems. Such MC circuits as the 21MC, familiarly known as squawk  boxes,  differ  from  the  preceding  PA  systems  in that they provide means for two-way communications. Each unit has a number of selector switches. To talk to one or more stations, you need only throw the proper switches and operate the press-to-talk button. A red signal light mounted above each selector switch shows whether the station called is busy. If it is busy, the light flashes; if it burns with a steady light, you know that the station is ready to receive. Following is an example of how to operate the intercom. You are on the signal bridge, at the 24MC transmitter (fig. 2-19), and you want to call conn. First you push the selector button marked CONN. We will assume the line is clear for your message, which means that  a  steady  red  light  appears  over  the  SIGNAL BRIDGE selector switch at the conn transmitter. When the operator at conn pushes on the SIGNAL BRIDGE button, the signal lights at both stations begin to flash. Now you can operate the PRESS-TO-TALK button and start your message. Any other station attempting to cut in gets the flashing busy signal. The chief disadvantage of the intercom is that it raises the noise level in any space in which it is used. For this reason, it seldom is used when telephones are manned. Intercom circuits that may be located on the bridge  are  identified  briefly  as  follows: The  20MC,  combat  information  announcing system, connecting the same stations as the 1JS Figure 2-19.— Typical MC unit. 2-18

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