2830A THREE DIVER COMMUNICATOR USER MANUAL
2830A-UM
REV 5.0
1
1 INTRODUCTION AND SPECIFICATIONS
1.1
INTRODUCTION
The AMCOM III series of diver communication systems are full-featured, hard wire, three-
diver communicators. The AMCOM III has independent microphone and earphone volume
controls for each diver and the tender.
All AMCOM III series have push-to-talk, and separate isolated inputs for each diver. The
AMCOM III Model 2830A/24 is a portable three diver communication system, delivering 20
Watts of "voice power", operating from either a 110/220 V
AC
, an external 12 V
DC
power
source, or an internal 12 V
DC
backup battery.
The Model 2830A has the capability of 2-wire and/or Full-Duplex (4-wire) communication
modes. 2-Wire and Full-Duplex (4-wire) modes can be used simultaneously. Full-Duplex is a
communications system designed from the "ground-up" to take advantage of the current
"state of the art" in semiconductor technology and provide superior diver hard wire
communication.
This portable diving communicator has the ability to work with the Dynamic and Pre-Amplifier
microphone in both 2-wire and 4-wire modes. This unique design has the ability to detect
both pre-amp and dynamic diver microphones that are in use. This feature will automatically
switch from a preamp mode to a dynamic mode and will adjust the specific diver gain
(volume).
The Model 2830A’s with 20 watt
s of power is the most powerful communicator on the market.
The untouched volume and clarity allows the tender’s volume to be set at very high levels
especially in noisy environments while the divers are at a comfortable listening level.
1.2
ELECTRICAL SPECIFICATIONS
Input Impedance (Each Input) .................................................................................. 250 Ohms
Frequency Response ........................................................................................ 300 - 10000 Hz
Common Mode Rejection (minimum) ................................................................................ 40 dB
Current Drain Maximum Full Volume ............................................................................. 3 Amps
Typical Quiescent ............................................................................ 0.25 mAmps
Minimum Load Impedance ............................................................................................... 2 ohm
Nominal Power Supply Voltage ....................................................................................... 12 V
DC
Operational Supply Voltage ........................................................... 90-264 Volts AC, 47-440 Hz
Sensitivity (Input) ..................................................................................................... 0.5 mVRMS
Maximum Output Power (4 Ohm Load, 14 V
DC
) ........................................................... 20 Watts
Battery Life (typical) ..................................................................................................... 15 Hours