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RedPhone-OS
Underwater telephone (surface station)
User’s manual

RedPhone-OS
Underwater telephone (surface station)
User’s manual

Content

1. Description of the RedPhone-OS station

1.1. Purpose of the device

The surface station for voice underwater acoustic communication RedPhone-OS (hereinafter referred to as the station) is intended for wireless transmission of voice messages from an overhead control point for diving descents to divers and receiving voice messages from divers equipped with wearable diving telephony devices that support signal parameters common with the station.

The general view of the station RedPhone-OS, with the connected transducer and microphone, is shown in Figure 1.

RedPhone-OS
Figure 1 - The general view of the station RedPhone-OS

The device is made in the form of a shockproof plastic device case, which, with the lid closed, provides protection class IP67. The built-in power supply made of LiFePO4 batteries that operate at low temperatures and provide more than 1000 charge-discharge cycles.

1.2. Controls and Connectors

The dashboard of the device is made of high-quality stainless steel, on which, using laser engraving, are applied informational inscriptions. Figure 2 shows the location of the controls and connectors.

RedPhone-OS top panel scheme
Figure 2 - Location of controls and connectors
1 - charger connector, 2 - speaker grill, 3 - transducer connector, 4 - volume control, 5 - channel switch, 6 - device toggle switch, 7 - speaker switch, 8 - microphone and PTT connector, 9 - headphone connector

1.3. Specifications

The station uses single-band amplitude modulation (SSB, Single side band) and supports the bands most commonly used in such systems, which ensures compatibility with almost all analogues.

Table 1 shows the correspondence of station channel numbers and frequency bands.

Table 1 - Correspondence of the channel number and signal parameters

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

General technical characteristics of the device are given in table 2:

Table 2 - Specifications

PARAMETER VALUE
DIMENSIONS (length х width х height) 259 x 202 x 115 mm
WIGHT (dry) 2 kg
MAX. OPERATING RANGE1 1000 m
ACOUSIC SOURCE LEVEL 160 dB re 1 μPa @ 1 m
TRANSDUCER’S CABLE LENGTH2 7 m
NUMBER OF SUPPORTED CHANNELS 8
VOICE BANDWIDTH3 300 .. 4300 Hz
BUILT-IN BATTERY LiFePO4 60 W*h
BATTERY LIFE (RX MODE)4,5 up to 30 hours
BATTERY LIFE (20% TX, 80% RX)4,5,6 up to 24 hours
BATTERY LIFE (50% TX, 50% RX)4,5,7 up 12 hours
WORKING TEMPERATURE RANGE -10 .. 50 °С
MICROPHONE Handheld, with PTT
EXTERNAL HEADPHONES RESISTANCE (not less) 8 Ohm
PROTECTION CLASS IP678

1 A parameter that determines the maximum range at which a signal can be received, based on electro-acoustic parameters of the transmitter and receiver, spatial decrease in the intensity of sound energy, attenuation in the medium and the acoustic noise level.
2 By agreement, delivery with increased cable length is possible.
3 The actual audible frequency range depends on the headset used.
4 When playing on the built-in speaker, with a volume level of 40%.
5 With a fully charged, new battery. At an ambient temperature of 20 ° C.
6 In the mode, 2 minutes of transmission and 8 minutes of reception.
7 In the mode, 5 minutes of transmission and 5 minutes of reception.
8 With top cover closed

1.4. Contents of the standard delivery set

This paragraph describes the standard delivery set (see table 3). By an additional agreement with the manufacturer, it is possible to supply a transducer with an extended cable.

Table 3 - RedPhone-OS Standard delivery set

No. Name Quantity Notes
1 Station RedPhone-OS 1 PC.  
2 Transducer 1 PC. cable 7 m
3 Tangent Microphone 1 PC.  
4 AC Charger 1 PC.  
5 Carabiner for attaching antenna cable 1 PC.  
6 Waterproof bag for transportation and storage of transducer and microphone 1 PC.  
7 Adapter with Jack 3.5 mm jack for connecting headphones (earphones) 1 PC.  

2. Work with the device

2.1. Preparation for work

RedPhone-OS case lock
Figure 3 - Lock

2.2. Testing routines

2.2.1. External visual check

It is carried out with the station cover open. During this check, it is controlled that:

If the expected conditions do not coincide with those observed, the operation of the station is prohibited!.

2.2.2. Checking device performance

It is carried out after a successful visual inspection, according to p. 2.2.1.

Additional verification conditions:

During the inspection, it is controlled that:

Sound example

After the check the toggle switch “Power” should be moved to the position “Off”

If the expected conditions do not coincide with those observed, the operation of the station is prohibited!.

2.2.3. Checking the transducer and microphone

It is carried out after successful checks in accordance with p. 2.2.1 and p. 2.2.2.

Additional verification conditions:

During the inspection, it is controlled that:

After the check the toggle switch “Power” should be moved to the position “Off”

Sound sample

If the expected conditions do not coincide with those observed, the operation of the station is prohibited!.

To check the operability of the headphones, the toggle switch “Speaker” must be in the state “Off” and all sound signals, including the background noise, should be controlled using the headphones according to the method described above.

Video tutorial: RedPhone-OS check before usage

RedPhone: check before usage

2.2.4. Before work

It is carried out after successful checks according to paragraphs. 2.2.1 .. 2.2.3.

Make sure that:

2.3. Working with the station

Before work, all preparations and checks provided in p. 2.2.

The underwater telephone works in half-duplex mode: transmission and reception alternate; if the device is in transmission mode, it cannot receive incoming messages.

2.3.1. Sound signals

Possible sound alerts are summarized in table 4.

Table 4 - Sound alerts

Alert Description Cause of alert Example
Short rising and then lowering tone The station power-on and switch to receive mode Sound sample
Short rising tone Switching to receive mode after completion of transmission (releasing tangents PTT) Sound sample
Short falling tone (~ every 30 seconds) Low charge internal power supply  

2.3.2. Receiving voice messages

To receive voice messages from divers, the PTT button on the microphone must be released. In this case, incoming messages will be played by the device’s speaker (or headphones, if the latter are connected and the toggle switch “Speaker” is in the state “Off”).

The volume of reproduced incoming voice messages depends on the slant range between the antenna station and the diver, as well as on hydrological conditions. It may decrease when a diver enters the acoustic shadow zone (when elements of the underwater landscape, parts of structures, ships, algae, etc. are on the signal path).

The user must independently set a comfortable volume level using the Volume control depending on the current communication conditions.

2.3.3 Sending voice messages

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

2.4. Shutdown

Upon completion of the work, the actions should be performed in the following sequence:

3. Storage and maintenance

3.1. Storage and Maintenance conditions

The station and the complete equipment: transducer, microphone and charger do not have special storage conditions, except for the following:

FORBIDDEN:

- OPENING OF EQUIPMENT FROM THE DELIVERY SET ACCORDING TO par. 1.4.
- ACCESS TO USE OF EQUIPMENT FROM THE DELIVERY SET ACCORDING TO par. 1.4. PERSONS WHO ARE NOT FAMILIAR TO THESE INSTRUCTIONS
- ACCESS TO USE OF EQUIPMENT FROM THE DELIVERY SET ACCORDING TO par. 1.4. PERSONS WHO ARE NOT ADULTS
- ENABLING TRANSMISSION MODE (PRESSING THE PTT BUTTON ON THE MICROPHONE) WHILE TRANSDUCER IS UNCONNECTED

3.2. Built-in Power Supply Charge

The charge of the station’s built-in power supply is allowed only with the original charger when the station is off (toggle switch “Power” in position “Off”) and all other connectors are disconnected. Before using the charger, you must read the operating instructions for the charger.

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 delivery 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 DELIVERY 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 SUPPLIED EQUIPMENT IS SAFE WHEN OPERATING ACCORDING TO THESE INSTRUCTIONS AND IS NOT RESPONSIBLE FOR ANY CONSEQUENCES OF USE OF THE SUPPLIED EQUIPMENT


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