Aquacom MK2-DCI User manual

User Guide
“Technology in Depth”
Two- or One-Diver Intercom
AQUACOM®MK2-DCI

- Notice -
This manual and the information contained herein are provided for the use as
a maintenance and operation guide. No license or rights to manufacture,
preproduce, and/or sell either the manual or articles described herein are given.
Undersea Systems International, Inc., dba Ocean Technology Systems, re-
serves the right to change specifications without notice. It is recommended
that all users read and fully understand this manual before using MK2-DCI.
All statements, technical information, and recommendations herein are based
on tests we believe to be reliable, but the accuracy or completeness thereof is
not guaranteed; and the following is made in lieu of all warranties, expressed
or implied, including the implied warranties of merchantability and fitness
for purpose: Seller’s and Manufacturer’s only obligation shall be to replace
such quantity of the product proved to be defective. Before using, user shall
determine the suitability of the product for intended use, and user assumes all
riskandliabilitywhatsoeverinconnectiontherewith.NeitherSellernorManu-
facturer shall be liable either in tort or in contract for any loss or damage,
direct, incidental, or consequential, arising out of the use of or the inability to
use the product. No statement or recommendation not contained herein shall
have any force or effect unless in an agreement signed by officers of the
Seller and Manufacturer.
- IMPORTANT SAFETY NOTICE -
(Please read before using product.)
IT IS ABSOLUTELY ESSENTIAL THAT ALL DIVERS ARE PROP-
ERLY TRAINED AND EQUIPPED AND FULLY UNDERSTAND THE
OWNER’S MANUAL BEFORE ATTEMPTING TO USE THE
AQUACOM®MK2-DCI.
WHILE AQUACOM®MK2-DCI PROVIDES DIVERS WITH GOOD
UNDERWATER COMMUNICATIONS, IT DOES NOT CHANGE OR
ELIMINATE THE POTENTIAL HAZARDS OF DIVING!
DO NOT ATTEMPT TO CHARGE BATTERIES BEFORE READING
PAGE 9, NUMBER 2, THE RB-6V SIX-VOLT OPTIONAL RECHARGE-
ABLE BATTERY SECTION. WITHOUT FOLLOWING PROPER PRO-
CEDURES, DAMAGE TO THE MK2-DCI, AN EXPLOSION, AND/OR
INJURY MAY OCCUR.
© Copyright 2001 Ocean Technology Systems
PN 506049-000 Rev. D

Table of Contents
Introduction (Section 1)........................................................... 1
MK2-DCI Specifications (Section 2) ...................................... 2
MK2-DCI Operating Instructions (Section 3)...................... 3-4
Figure 1 (MK2-DCI Two-Diver Air Intercom)........................ 5
Two-Wire Mode (Section 4) .................................................... 6
Two-Wire Mode (Figure 2), Four-Wire Mode (Figure 3)........ 7
Four-Wire Mode ...................................................................... 8
Batteries (Section 7) ........................................................... 9-12
Helpful Hints ......................................................................... 13
Limited Warranty................................................................... 14
i

SECTION 1
INTRODUCTION:
Congratulations! You have just purchased the finest, state-of-the-art
hard-wire intercom in the world. Your new MK2-DCI Two- or One-
Diver Air Intercom represents state-of-the-art technology and innova-
tion—the choice of discriminating divers throughout the world. Please
take the time to read this owner’s manual. With proper care and use,
your Ocean Technology Systems product will provide you with the ul-
timate in high-quality communications and reliability.
The MK2-DCI is a compact, self-contained Two- or One-Diver Air In-
tercom providing clear communications between the operator and
diver(s). The MK2-DCI offers two- or four-wire communications.
This manual will cover Specifications, Operating Instructions, Two-
Wireor Four-WireCommunications, Batteries,Helpful Hints,and War-
ranty Information.
These guidelines and illustrations are presented to assist you. If you
need additional information, do not hesitate to confer with your local
OTSdealer orrepresentative.If yourequireservice, contactOceanTech-
nologySystems,3133 WestHarvardStreet, Santa Ana,California92704,
Telephone [phone], Toll-Free [phone], Fax (714) 966-
1639, www.oceantechnologysystems.com.
1

SECTION 2
MK2-DCI SPECIFICATIONS:
BatteryLife: 20 hours continuous use
BatteryType: (2) 6-volt lantern batteries, recommended
batteries (Eveready Heavy Duty Alkaline
#528 or Duracell Heavy Duty Alkaline ID
#9150) or an external 12-volt source; op-
tional 6-volt rechargeable batteries.
Power Output: 20 watts
Frequency Response: 600 to 12,000 Hz
Cabinet Material: ABS plastic
Front Panel: 1/8” aluminum, chemically treated and
coated with a tough, durable, urethane fin-
ish to withstand the marine environment.
Size: Height: 6 5/8” (16.8 cm)
Width: 16 3/8” (41.6 cm)
Depth: 8 3/8” (21.3 cm)
Weight: 14.0 lbs.
2

SECTION 3
MK2-DCI OPERATING INSTRUCTIONS (see page 5):
1) Record Out: Permits tender to record diving operations (Line
level).
2) Volume: Tender-to-diver(s) volume control.
3) Power ON: Turns the power ON or OFF.
4) Battery Level: Color LEDs illuminate to alert tender to condi-
tions of batteries.
5) Ext. Power: A 12-volt, DC power source can be used.
6) Push-to-talk: Push button used in two-wire mode by tender to
talk to divers.
7) Tender Tender-worn earphones connect via banana
Headset: plug connectors.
8) Mic. (RED): Used for hand-held or boom mic. via banana plug
connector.
9) Volume: Diver #1: diver-to-tender volume control.
10) Earphone: Diver #1: earphone connection (banana or bare-
wire style).
11) Microphone: Diver#1:microphone connection(bananaorbare-
wire style).
12) Volume: Diver #1: tender-to-diver volume control.
13) Microphone: Diver#2:microphone connection(bananaorbare-
wire style).
3

14) Earphone: Diver #2: microphone connection (banana or
bare-wire style).
15) Handle: Front panel handle (right & left side).
16) Volume: Diver #2: tender-to-diver volume control.
17) Volume: Diver #2: diver-to-tender volume control.
18) Speaker: Front panel speaker.
19) Thumb Screw: One of four front panel screws (captive).
20) Speaker: Remote speaker output (speaker level).
21) Volume: Volume control for front panel speaker.
22) Speaker: Switch to turn the front panel speaker ON or
OFF.
23) Cross Talk: Switch used to cross-talk Diver 1 to Diver 2
or vice versa. Tender must hold the switch in
the directioin of the cross talk. This is a mo-
mentary 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 mi-
crophone with a PTT switch is used.
(Note: See page 5, Figure 1 for a panel description.)
4

MK2-DCI TWO-DIVER AIR INTERCOM
Figure 1
5

SECTION 4
TWO-WIRE MODE:
In normal two-wire operations, the two wires within the diver commu-
nication cable are connected to the corresponding binding post (Divers
#1 and #2) on the surface unit (see Figure 2). If a four-wire cable is
used, two wires are normally twisted together for one side of the micro-
phone 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 mi-
crophone. If required, a separate microphone and earphone can be used
with the divers’ masks or helmets. If a speaker is located in a diving
bell or recompression chamber, the MK2-DCI can be used as the com-
munications link between the divers and the outside. When the system
is used where conditions are noisy, the tender can switch off the speaker
and use a headset and boom microphone. However, when using a head-
set with a boom microphone, the tender must use a push-to-talk (PTT)
button to communicate. Our headset with a boom microphone has a
PTT button located on one side of the headset. The MK2-DCI also has
a PTT. The divers’ communication is the primary signal. When the
tender uses the PTT button, his signal becomes the primary signal. If
the diver is trying to say something while the tender is talking, the ten-
der will not hear the diver until he releases the PTT button.
The divers’ helmets and/or full face masks are typically wired with the
earphones and microphones tied together. When wired like this, the
divers’ earphone and microphones are functioning together. Bubbles
passing by the earphones while the diver is talking will be picked up
via the earphones. This will cause the communications to be noisy.
When the tender is talking to the diver, his voice is heard not only from
the diver’s earphone, but also from the microphone!
6

7
TWO-WIRE MODE (Figure 2)
FOUR-WIRE MODE (Figure 3)