GENERAL INFORMATION
DESCRIPTION 2.1
The AMRON INTERNATIONAL Inc., AMCOM II Model 2820A-4003 and 2820A-4003E are
decompression chamber communication systems, providing two-way communications between
the chamber operator and the occupants of the chamber. The Model 2820A-4003 & 2820A-4003E
are used in conjunction with a chamber talk back speaker i.e., the Amron Model 3113, 3114, 3115,
3125 or 3126. The Model 2820A-4003E is exactly the same as the 2820A-4003, but also includes
a separate entertainment channel, amplifier. This is used with the Model 3130 entertainment
speaker to provide music (audio) to the chamber occupants. All references to the Model 2820A-
4003 apply as well to the 2820A-4003E.
The AMCOM II chamber communication systems are full feature hard wire, two lock communicator
systems. The AMCOM II has independent volume controls (operator, inner lock, & outer lock.), as
well as separate on/off controls for each lock. Both models are supplied with hand-held
microphones, for use by the operator.
The 2820A-4003 has the capability of two modes of operation, a simple intercom type operation,
or telephone type operation using headsets both inside and outside the chamber. The two modes
are known as, 2-wire and/or full duplex (4-wire) communications.
The two-wire mode of operation is a simplex type system. The operator monitors the chamber
conversations via a talkback speaker mounted on the front panel of the unit. The operator can talk
to the occupants by using the hand held microphone, or by using the Push-To-Talk (PTT) switch
and speaking into the front panel talk back speaker. Inside the chamber is a talk back speaker,
which picks up the sounds within the chamber. When the operator speaks to the chamber, the
2820A-4003 connects the chamber internal speaker to the amplifier output and the operator voice
is broadcast to the chamber occupants. All switching operations take place outside the chamber.
The full duplex mode of operation requires the use of two headsets, one for the operator and one
for use inside the chamber. Conversations are full duplex, and occur as with a telephone, and do
not require the use of the PTT switch. Additional headsets can be used both inside and outside the
chamber, allowing several parties to communicate. The system also permits mixed operation,
however any mixed operation does require the use of the PTT switch. The PTT switch also
provides an over-ride function, operator conversation over-rides occupant. 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 communications.
The unit operates from 115/230 VAC 50/60 Hz and has internal rechargeable battery back-up. It
also can be operated from an external 12 VDC power source.
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