Instruction Manual - Amron International Inc.

INSTALLATION & OPERATIONSIMULCOM - WHAT WHY AND HOW (continued) 6.12DOESN’T THE SAME THING HAPPEN WITH ROUND ROBIN? NO!With Round Robin you split the microphone and earphones, but also stack all the microphonestogether. The microphones load each other and you are right back where you started. Also, youhave another problem - the headset used by the tender usually has 600-ohm earphones and a 50-ohm microphone. With two diver's microphones we have an impedance of 4 ohms, which reallyloads the tender microphone, and the 600-ohm earphones tend to be rather low so you end upwith a volume imbalance as well as low signal levels from the diver & tender microphones.So it sounds as though it might be worth trying; how do you go about doing it?Okay - step by step:1. First you must have an AMCOM III series unit.2. You must have 4 wires in your communication cable.3. You must have 4 wires to your hat/helmet, (i.e., Marsh Marine connector or such).With those three things we can begin:1. Install male marsh-marine 4-pin connector in hat/helmet. Attach black and white wires tobinding post and both speakers. Attach red and green wires to leads from microphone. Itdoesn’t matter which color goes to which lead. Use 8-32 x 1/4 SS screw and nuts, covereach with tape or shrink tubing. You are now finished with the diving hat/helmet.2. Install 4-pin female marsh-marine connector on diver's end of communication cable withred and green wires to the light colored pair of comm cable wires and black and whitewires to black pair of comm-cable wires. You are now finished with this step.3. Install black dual banana plug to black pair of wires on tender end of diver comm-cableand attach red dual banana plug to lighter color pair of wires. If you don’t have red dualbanana plugs, red tape will serve to identify that pair as the microphone circuit.YOU ARE FINISHED!26