Amron 8225-HP, Instruction Manual

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OPERATING PROCEDURES
WHAT IS SIMULCOM (Continued) 8.11
2.
Doesn’t the same thing happen with “Round-Robin”? No!
With “Round-Robin” you split the mic and earphones, but stack all the mics together. The
microphones load each other and you are right back where you started. Also, you have
another problem - the headset used by the tender usually has 600-ohm earphones and a
50-ohm microphone. With two diver mics we have an impedance of 4 ohms which really
loads the tender mic and the 600 ohm earphones tend to be rather low so you end up with
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 a AMCOM II Series Communicator
2. You must have 4 wires in your comm 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 to
binding post and both speakers. Attach red and green wires to leads from microphone. It
doesn’t matter which color goes to which lead. Use 8-32 x 1/4 S/S screw and nuts, cover
each with tape or shrink tubing. You are now finished with the diving hat/helmet.
2.
Install a 4 pin female marsh-marine connector on diver’s end of comm cable. Red and
green to light colored pair of common cable; black and white to black pair of common-
cable. You are now finished with this step.
3.
Install a black dual banana plug to black pair of wires on tender end of diver common-cable
and attach red dual banana plug to lighter color pair of wires. If you don’t have red dual
banana plugs, red tape will serve to identify that pair as the mic circuit.
You are finished!
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