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Features include a depth telemetry
capability for improved positioning accuracy, channel selection
via dual external controls (or optional serial data link)
and innovative 'screw-off' acoustic release mechanism. These
benefits are combined with an increased depth rating (2,500m,
4,000m or 6,000m) and compatibility with all HPR 300 and
HPR 400 channels. Where size and weight are important operational
factors a short housing version is available (requires external
power supply)
Applications for the PGT
include the accurate tracking of cable ploughs and deep
ROVs, long term marking of seabed targets (e.g. wellheads)
and as a position reference transponder for dynamic positioning
systems.
Technical Specifications
| Feature |
Type 7971 |
Type 7977 |
Type 7978 |
| Depth Rating |
2,500 Metres
(4,000 Metre option available) |
2,500 Metres
(4,000 Metre option available) |
2,500 Metres
(4,000 Metre option available) |
Operating Frequency Channels
|
HPR 300/400 Channels |
HPR 300/400 Channels |
HPR 300/400 Channels |
| Transducer Beamshape
|
Omni-Directional ±130º
|
Directional ±30º |
Super-directional ±12º |
| Transmit Source Level (dB
re 1µPa @ 1m) |
192dB ±3dB |
200dB ±3dB |
206 ±3dB |
Number of Transmission
(High Power on Channel 33) |
Alkaline:1.0 X 10
Lithium:2.3 X10 |
Alkaline: 0.8X10
Lithium: 1.8X10 |
Alkaline: 0.5X10
Lithium: 1.2X10 |
Receive Sensitivity
|
<85dB re 1µPa |
<85dB re 1µPa |
<85dB re 1µPa |
| Listening Life (Days) |
Alkaline: 3.7 years,
Lithium: 6.1 years |
Alkaline: 3.7 years,
Lithium: 6.1 years |
Alkaline: 3.7 years,
Lithium: 6.1 years |
| Mechanical Construction |
Aluminum Alloy,
Hard Anodised |
Aluminum Alloy,
Hard Anodised |
Aluminum Alloy,
Hard Anodised |
| Dimensions (LxDia) |
1107mm X 183mm |
1107mm X 183mm |
1107mm X 183mm |
| Weight in Air |
22kg |
22kg |
22kg |
| Weight in Water |
9kg |
9kg |
9kg |
| Features |
Pressure relief safety
valve, External channel selection control
External On/Off control, High/Low Transmit power set
via RS232 port (if fitted) |
Features
:-
- Depth rated to 2,500 Metres (4,000 Metre
rated option available)
- Channel selection via dual external
controls or optional serial data port
- Depth telemetry capability option
- 'Screw-off' acoustic release available
- Choice of housing lengths to suit deployment
scenario and application
Type 7977/7978
- Depth rated to 2,500 Metres (4,000 &
6,000 Metre rated option available)
- High power Directional and Super Directional
transducers
- Depth telemetry capability option
- 'Screw-off' acoustic release available'
- External On/Off and channel controls
- Choice of short (No battery) or long
housing available
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