OTS DRS-100 Mod B User Manual

Undersea Systems International, Inc.

dba

OCEAN TECHNOLOGY SYSTEMS

“Technology in Depth”

Diver Recall System

DRS-100

Mod B

User’s ManuaL

- IMPORTANT SAFETY NOTICE -

It is absolutely essential that all users are properly trained and equipped and fully
understand this user’s manual before attempting to use the DRS-100 (mod B) Diver
Recall/Hydrophone System.

Read and fully understand the battery charging section of this manual before you
attempt to charge or operate the DRS-100.

While the DRS-100 provides divers with good underwater communications, it does
not change or eliminate the potential hazards of diving!

- NOTE -

This manual and the information contained herein are provided for use as a mainte­nance and operation guide. No license or rights to manufacture, reproduce, and/or
sell either the manual or the articles described herein are given. Ocean Technology

Systems reserves the right to change specications without notice.

© Copyright 1994, 2008 by Undersea Systems International, Inc., dba

Ocean Technology Systems. All rights reserved.

Specications are subject to change without prior notice.

i

Refer to the Library page of our Web site, www.oceantechnologysytems.com,
for a list of any changes made to this manual since its publication.

506016-000 (rev. J)

TABLE OF CONTENTS

Section 1: Introduction ...............................................................................1

1.1 Specications ...................................................................................2

1.2 Features and Functions ....................................................................3

Section 2: Setup and Operation .................................................................5

2.1 Setup ................................................................................................5

2.2 Operation ..........................................................................................5

2.2.1 Power and Volume Control ................................................5

2.2.2 Transmission ......................................................................6

2.2.2.1 Tone/Recall Mode ...............................................6

2.2.2.2 Voice Communication .........................................6

2.2.2.3 External Audio ....................................................6

2.2.3 Recording ..........................................................................6

Section 3: Batteries and Charging .............................................................7

3.1 Battery Charging Procedure .............................................................7

3.2 Battery Removal/Replacement ........................................................8

Section 4: Maintenance and Troubleshooting ........................................ 10

4.1 General ...........................................................................................10

4.2 Preventive Maintenance .................................................................10

4.2.1 Check Prior to Every Dive ..............................................10

4.2.2 Maintenance Following the Dive ....................................10

4.3 Troubleshooting .............................................................................11

4.4 Removal or Replacement of Parts ..................................................11

4.4.1 Electronics Chassis Removal ..........................................11

4.4.2 Battery Replacement .......................................................11

4.4.3 Fuse Replacement ............................................................11

Appendix: Spare Parts ..............................................................................12

Limited Warranty ......................................................................................13

Illustrations

Figure 1: Layout of the DRS-100B ................................................................3

Figure 2: Battery Compartment Layout .........................................................9

Tables

Table 1: Troubleshooting ..............................................................................11

ii

SECTION 1

INTRODUCTION

Thank you for choosing the Ocean Technology Systems DRS-100 (mod B) Diver
Recall/Hydrophone System. With the DRS-100, you can recall free-swimming
divers with a solid tone, intermittent tone, or voice transmissions. The underwater
listeners need not wear any special diving equipment to hear. Topside personnel
can even transmit music or any other audio signal by connecting the source to
the line-in jack on the DRS-100 panel. The DRS-100 can even be used as a hy­drophone, allowing the user to listen to marine biological and man-made sounds
present in the water. These sounds can be recorded easily via the external record
output jack on the front panel.

How do the divers hear? Sound is transmitted through the water omnidirectionally
by an underwater transducer. The typical range is 500 meters but depends on the
biological/ambient noise level. Divers within range listen using only their ears;
no electronic equipment is necessary.

The DRS-100 Diver Recall System provides the following:

• A self-contained control module with a housing that is sturdy, resistant to marine

corrosion, o-ring sealed, and constructed of lightweight materials

• A transducer attached to 25 feet of cable

• An HSM-10 hand-held microphone with a push-to-talk button

• Two maintenance-free rechargeable batteries

• An RCS-30 smart charger

Before operating or charging the DRS-100 Diver Recall System, read this entire
manual. In addition to the instructions for use and maintenance of the system, there
are some important safety issues all users must be familiar with before operation.
Should you have any questions, please contact your local Ocean Technology Sys­tems (OTS) dealer, or feel free to contact OTS directly (see p. 13 for OTS contact
information).

1

1.1 SPECIFICATIONS

Input voltage: 24 VDC

Input current: 7 amps maximum

Idle current: 75 mA

Audio power (PEP*): Recall & tone: 132 watts

Voice: 132 watts

Frequency response: 500–4000 Hz

Recall oscillation rate: 5 Hz

Beam pattern: Omnidirectional

Transducer cable: 25 feet in length

Transducer: Anodized aluminum

Fuse type: 6 amps, slow-blow (use slow-blow fuse only)

Transducer: Size: 9 in. diameter, 6 in. axial length

Weight: 13 lbs. in air, 2 lbs. in water

Low-battery LED: Flashes at approximately 20 volts

Battery type: Two 12-volt, 2.6 amp-hour, maintenance-free re-

chargeable cells (in series)

Battery life: 5 hours at 20% duty cycle (Recall/Tone mode)

3 hours nominal when using auxiliary input (medium
volume)

Microphone type: Push-to-talk, front panel (optional hand-held with

PTT available)

Size: Depth: 10.6 in. (including handle and hinges)

Length: 14 in.
Height: 4.7 in. without cover

6.5 in. with cover

Weight: 15 lbs.

Battery charging time: 2-3 hours (the RCS-30 automatically switches to

maintenance mode when the battery is fully charged,
indicated by the LED turning green)

RCS-30 smart charger: 90–260 VAC input; 24 VDC, 1300 mA, 50/60 Hz out-

put

2

* Peak envelope power