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RedPhone-D
Underwater telephone. Diver’s unit
User’s manual

RedPhone-D
Underwater telephone. Diver’s unit
User’s manual

Contents

1. RedPhone-D: Device description

1.1. Purpose

Diver’s wireless voice communication unit RedPhone (hereinafter - the station) is intended for the wireless exchange of voice messages between divers, as well as divers and a surface control station, equipped with diving communication devices that maintain signal parameters common with the station.

The general view of the station RedPhone is shown in Figure 1.

RedPhone
Figure 1 - RedPhone general view

The device is made in a plastic case with a serviceable battery compartment, where rechargeable batteries of 18650 type are located. On the upper part of the device, there is a hydroacoustic transceiver antenna and a cable entry with a cable and a connector for a telephone headset with a push-to-talk (PTT) button. Versions are possible both for headsets with built-in push-to-talk button, and without it, in this case, the device can be equipped with its own push-to-talk button.

1.2. Controls and Connectors

The device does not contain external controls and turns on automatically when it submerged into the water. Charging is performed with a complete cradle (chassis) with a charger. Switching channels and switching on the compatibility mode with the navigation tracking system RWLT is carried out using a DIP-switch located in the battery compartment.

Figure 2 shows the location of the channel selector and the compatibility mode with the RWLT navigation system.

RedPhone dip-switch scheme
Figure 2 - The location of the channel selector in battery compartment

Table 1 describes the functions of the switch sections.

Table 1 - Switch Section Functions

Section number Function
1 RWLT navigation system compatibility mode
2 Channel selector - bit 2
3 Channel selector - bit 1
4 Channel selector - bit 0

1.3. Technical specifications

The station uses single sideband amplitude modulation (engl. SSB, Single side band) and supports the bands most commonly used in such systems, which ensures compatibility with almost all analogs. Table 2 shows the correspondence of station channel numbers and frequency bands.

Table 2 - Correspondence of channel number, position of switch sections and signal parameters

Channel number Bit 2 Bit 1 Bit 0 Carrier, Hz Side band Bandwidth, Hz
1 0 0 0 32768 Lower 28468 .. 32468
2 0 0 1 32768 Upper 33068 .. 37068
3 0 1 0 31250 Lower 26950 .. 30950
4 0 1 1 31250 Upper 31550 .. 35550
5 1 0 0 28500 Lower 24200 .. 28200
6 1 0 1 28500 Upper 28800 .. 32800
7 1 1 0 25000 Lower 20700 .. 24700
8 1 1 1 25000 Upper 25300 .. 29300

General technical specifications of the device are shown in table 3:

Table 3 - Technical specifications

PARAMETER VALUE
DIMENSIONS1 203 x 105 x 45 mm
WEIGHT2 (dry) 1.55 kg
MAX. DEPTH 70 m
MAX. OPERATING RANGE3 1000 m
ACOUSTIC SOURCE LEVEL 150 dB re 1 uPa @ 1 m
VOICE BANDWIDTH4 300 .. 4300 Hz
NUMBER OF SUPPORTED CHANNELS 8
BATTERY LIFE (RX MODE)5 up to 80 hours
BATTERY LIFE (MIXED MODE)5, 6 up to 2 hours
BATTERY LIFE (MIXED MODE)5, 7 up to 2.5 hours
WORKING TEMPERATURE RANGE 0 .. 50° С
BATTERIES 3 x 18650 Li-Ion
CHANNEL SWITCHING DIP-switch in the battery compartment
BODY MATERIAL Delrin
CABLES INSULATION MATERIAL Polyurethane
NAVIGATION SIGNAL CARRIER8 20050 Hz
NAVIGATION SIGNAL MODULATION TYPE BPSK
NAVIGATION SIGNAL DURATION 200 msec

1 Including transducer.
2 With a battery, a PTT and a mask connector, deepending on the specific connector, the value may differ by the weight of the connector.
3 A parameter that determines the maximum range at which a signal can be received based on the electro-acoustic parameters of the transmitter and receiver, spatial decrease in the intensity of sound energy, attenuation in the medium and level of acoustic noise.
4 The actual audible frequency range depends on the headset used.
5 With new, fully charged batteries with a capacity of 3000 mA*h or more, at an ambient temperature of 20 °C.
6 While transmitting 2 minutes per 10 minutes.
7 While transmitting 5 minutes per 10 minutes.
8 The function is provided by buoys of the RWLT navigation system.

1.4. Equipment set

Table 4 - equipment set

Item Quantity Description
1 RedPhone-D with belt clip and headset connector 1 pcs.  
2 Charger with cradle 1 pcs.  
3 SPTA kit (bit for a hex nut, a set of bolts and nuts, spare o-ring seal) 1 pcs.  

2. Using the device

2.1 Preliminary checks

Before immersing the appliance in water, it is the user’s responsibility to ensure that:

Before starting work, the user must:

2.2. Working mode

Before work, all preparations and checks must be accomplished provided in 2.1..

Diver’s wireless voice communication works on a half-duplex scheme: transmission and reception alternate, if the device is in transmission mode, it cannot receive incoming messages.

2.2.1. Sound alerts

Possible sound alerts are summarized in Table 5.

Table 5 - Sound alerts

Alert Meaning
Short rising and then falling tone On power on
Short rising tone Switching to the receive mode
Short falling tone (~ every 30 seconds) Internal power supply low

2.2.2. Receiving voice messages

To receive voice messages from divers, the PTT button on the headset must be released. In this case, incoming messages will be played by the headset.

The volume of the reproduced incoming voice messages depends on the distance between the acoustic antennas, on hydrological conditions. It may decrease when the diver enters the acoustic shadow zone (when elements of the underwater landscape, parts of structures, ships, algae, etc. are on the signal path).

2.2.3. Transmitting voice messages

To transmit voice messages, the following sequence of actions is performed:

2.3. Finishing work

Upon completion of the work, the diving station does not require any additional manipulations and turns off automatically in the air. Before placing in the shipping container, it is necessary to rinse and/or desalinate in fresh water, followed by wiping with an absorbent cloth and air drying for at least 30 minutes.

3. Storage and maintenance

3.1. Storage and maintenance conditions

The station does not need special storage conditions, except for the following:

PROHIBITED:

- OPENING EQUIPMENT FROM THE DELIVERY SET ACCORDING TO p. 1.4.
- ACCESS TO USE OF EQUIPMENT FROM THE DELIVERY SET ACCORDING TO p. 1.4. PERSONS WHO ARE NOT FAMILIAR WITH THESE INSTRUCTIONS
- ACCESS TO USE OF EQUIPMENT FROM THE DELIVERY SET ACCORDING TO p. 1.4. PERSONS UNDER THE ADVANCED

3.2. Charging the device

Charging of the built-in power supply of the station is allowed only with the charger from the equipment set when the headset connector is disconnected. Before using the charger, read the operating instructions for the charger. To charge the device, you must install it in the charging cradle and connect the complete charger in the household electrical network. The end of the charge is determined by the indicator of the charger from the equipment set.

3.3. Battery replacement

The device has a serviceable battery compartment, which houses 3 Li-Ion batteries of size 18650. Dismantling of the battery compartment cover should only be carried out by qualified persons and only to change channel settings and/or switch compatibility with the RWLT navigation system, and also for replacing batteries at the end of their service life. It is highly discouraged to frequently open and close the battery compartment in order to quickly replace discharged batteries with charged ones: the user must monitor the state of charge of the batteries and charge them in a timely manner, especially before use

To remove and install the cover of the battery compartment:

RedPhone battery compartment screws
Figure 3 - Location of screws of the battery compartment cover

WARNING !!!

It is strictly forbidden to unscrew any other screws and nuts on the device, except for those that secure the battery compartment cover! This may damage the device!

4. Liability and disclaimer

4.1 Terms of replacement and free warranty service

The manufacturer’s warranty applies only to factory defects that were discovered during the operation of the device in accordance with this manual during the warranty period (2 years from the date of purchase).

The manufacturer guarantees free repair or replacement of faulty equipment from the equipment set that has failed due to a factory defect.

The reasons for refusing free warranty service, free repair and replacement include:

4.2 Disclaimer of the manufacturer


ANY OF THE PARTS OF THE EQUIPMENT SET ACCORDING TO par. 1.4. SEPARATELY AND IN THE COMPOSITION OF THE SYSTEM, NAME FURTHER “DELIVERED EQUIPMENT”:

- ARE NOT DESIGNED FOR WATER RESCUE USE
- NOT TESTED AS RESCUE EQUIPMENT
- NOT RESCUE EQUIPMENT
- THE MANUFACTURER DECLARES THAT THE DELIVERED EQUIPMENT IS SAFE WHEN OPERATING ACCORDING TO THESE INSTRUCTIONS AND IS NOT RESPONSIBLE FOR ANY CONSEQUENCES OF USE OF THE DELIVERED EQUIPMENT


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