4
Figure 1. MK2-DCI Two-Diver Air Intercom
talk. This is a momentary switch.
24)
Diver Select:
Switch used to select Diver 1, Diver 2, or Both-Divers
communications.
25)
REM:
This connector is used if a headset/boom microphone
with a PTT switch is used.
3.2
TWO-WIRE MODE
In normal two-wire operations, the two wires within the diver communication
cable are connected to the corresponding binding post (Divers #1 and #2) on the
surface unit (Fig. 2). If a four-wire cable is used, two wires are normally twisted
together for one side of the microphone binding post, and the remaining two wires
twisted together for the other microphone binding post.
This configuration allows the tender to talk to the divers individually or both divers
simultaneously. The diver(s) may also communicate with each other when the
tender engages the cross-talk switch. The divers’ speaker and the surface unit
speaker both function as speaker and microphone. If required, a separate micro-
phone and earphone can be used with the divers’ masks or helmets. If a speaker is