$220.00$2,000.00

This professional-grade neutrally buoyant tether combines rugged strength and durability with high-performance electrical characteristics for wide-ranging ROV and subsea applications. The 4UTP tether comes with a pre-installed Binder 770 connector and Wetlink Penetrator, while the 1UTP comes with preinstalled cable penetrator and Binder 770 connector.

Clear
SKU: FATHOM-TETHER-NB-XP-26AWG-VP
HS Code: 8544.11.00.30

Product Description

A note about the communication’s length: Blue Robotics has conducted ranged communications testing and found that 300m is the maximum communications length for the Standard Fathom Tether and 200m is the maximum communications length for the Slim Fathom Tether. We do not manufacture ROV-ready tethers in lengths longer than 300m for Standard and 200m for Slim.

The Fathom Tether is a high quality tether cable designed specifically for ROVs and other subsea applications. It is neutrally buoyant, has 300-350 lb breaking strength, and is embedded with water-blocking fibers to seal any leaks. With diameters of 4mm and 7.6mm, these tethers are slimmer than the vast majority of comparable ROV tethers.

The tether carries one or four unshielded twisted pairs (UTP) of 26AWG wire. These pairs are colored and arranged in the same fashion as a Cat5 networking cable including cross-talk resistance. A pre-installed Binder 770 plug makes it easy to connect to the FXTI and Fathom Spool. A cable penetrator is installed at the other end to interface with the BlueROV2 or any of our watertight enclosures.

The slim tether really shines when it comes to its size. Its slim profile makes it ultra low-drag, making it ideal for deep dives, high current dives, and long distance dives where the drag from the tether is really noticeable. The size also makes it incredibly portable and easy to handle. A hundred meter tether weighs just 3 lb (1.4 kg) and can be managed by hand very easily.

Since the slim tether only has two wires, it can only be used for the primary communication of the BlueROV2. There are no spare twisted pairs when using this cable, which means that it is not compatible with applications where you need extra tether pairs.

The core of the cable contains Kevlar strands for strength and Dacron fibers for space filling. Both fibers are impregnated with waterblocking compound to block any leaks caused by nicks or rips in the cable. The high-visibility yellow polyurethane foam jacket resists abrasion and provides neutral buoyancy.

The stiffness of the cable is designed to be flexible enough to give plenty of freedom to your ROV, but stiff enough that it does not become tangled easily.

The capabilities of this tether are meant to provide design flexibility and a wide variety of uses. Pololu carries the 3 position 0.1” (2.54mm) Crimp Connector Housings and male crimp pins that may be used for connecting your own devices to the spare tether terminations.

We also have this cable available by the meter with no terminations at either end.

Product Description

A note about the communication’s length: Blue Robotics has conducted ranged communications testing and found that 300m is the maximum communications length for the Standard Fathom Tether and 200m is the maximum communications length for the Slim Fathom Tether. We do not manufacture ROV-ready tethers in lengths longer than 300m for Standard and 200m for Slim.

The Fathom Tether is a high quality tether cable designed specifically for ROVs and other subsea applications. It is neutrally buoyant, has 300-350 lb breaking strength, and is embedded with water-blocking fibers to seal any leaks. With diameters of 4mm and 7.6mm, these tethers are slimmer than the vast majority of comparable ROV tethers.

The tether carries one or four unshielded twisted pairs (UTP) of 26AWG wire. These pairs are colored and arranged in the same fashion as a Cat5 networking cable including cross-talk resistance. A pre-installed Binder 770 plug makes it easy to connect to the FXTI and Fathom Spool. A cable penetrator is installed at the other end to interface with the BlueROV2 or any of our watertight enclosures.

The slim tether really shines when it comes to its size. Its slim profile makes it ultra low-drag, making it ideal for deep dives, high current dives, and long distance dives where the drag from the tether is really noticeable. The size also makes it incredibly portable and easy to handle. A hundred meter tether weighs just 3 lb (1.4 kg) and can be managed by hand very easily.

Since the slim tether only has two wires, it can only be used for the primary communication of the BlueROV2. There are no spare twisted pairs when using this cable, which means that it is not compatible with applications where you need extra tether pairs.

The core of the cable contains Kevlar strands for strength and Dacron fibers for space filling. Both fibers are impregnated with waterblocking compound to block any leaks caused by nicks or rips in the cable. The high-visibility yellow polyurethane foam jacket resists abrasion and provides neutral buoyancy.

The stiffness of the cable is designed to be flexible enough to give plenty of freedom to your ROV, but stiff enough that it does not become tangled easily.

The capabilities of this tether are meant to provide design flexibility and a wide variety of uses. Pololu carries the 3 position 0.1” (2.54mm) Crimp Connector Housings and male crimp pins that may be used for connecting your own devices to the spare tether terminations.

We also have this cable available by the meter with no terminations at either end.

Standard Fathom ROV Tether

  • 1 x Fathom ROV Tether with Installed Binder 770 Plug and WetLink Penetrator (of the selected length)
  • 1 x Header Pin to Ferrule Adapter to Connect to Fathom-X
  • 1 x Tether Cable Thimble
  • 1 x M10 Nut
  • 1 x O-ring for Bulkhead
  • 5 x Heavy Duty Zip Ties

Fathom Slim ROV Tether

  • 1 x Slim Tether Cable with Cable Penetrator and Binder 770 Connector (of the selected length)

Specifications

Standard Fathom ROV Tether

ParameterValue
Performance
Maximum Rated Depth (seawater)950 m3116 ft
Design Lifetime¹3 years or 500 cycles to rated depth
Temperature Rating (air)-25 to 60°C-13 to 140°F
Temperature Rating (water)0 to 40°C32 to 104°F
Installed Penetrators and Connectors
TopsideBinder 770 Plug
ROV SideWLP-M10-7.5MM-HC
Twisted Pairs0.1" Header Pins, 3 Position
Tools
Compatible Bulkhead WrenchWL-M10-BULKHEAD-WRENCH
Recommended Installation Torque3.5 Nm
Physical
Tether Diameter7.6 mm
Weight0.043 kg/m
Outer JacketPolyurethane Foam
Buoyancy in FreshwaterNeutral
Buoyancy in SaltwaterSlightly Positive
Wire Gauge0.14 mm²26 AWG
Working Strength35 kgf80 lb
Breaking Strength155 kgf350 lb
Minimum Working Bend Diameter75 mm3 in
Recommended WLP Thru Hole Diameter10.2 mm
Bulkhead ThreadM10 x 1.5
Bulkhead Thread Length20 mm
Bulkhead/Nut Wrench Flats16 mm
Overall Assembled Height From Endcap25 mm
Overall Outer Diameter18 mm
Bulkhead O-ring SizeAS568-013 Buna-N 70A
Bulkhead/ Plug Material7075-T6 Anodized Aluminum
Wetted MaterialsBuna-N Rubber
Molykote 111 Compound
7075-T6 Anodized Aluminum
PUR Foam
Electrical
DC Resistance @ 20°C0.0386 Ω/ft0.127 Ω/m
Insulation Resistance @ 500 VDC> 500 MΩ/kft> 1640 MΩ/km
Voltage Rating300 VDC
¹ Design life was used to inform testing in an accelerated environment, does not reflect warranty period.

Fathom Slim ROV Tether

ParameterValue
Physical
Tether Diameter4.0 mm0.16 in
Weight in Air0.012 kg/m0.00805 lb/ft
Jacket MaterialPolyurethane Foam
Buoyancy in FreshwaterNeutral
Buoyancy in SaltwaterSlightly Positive
Wire Gauge0.14 mm226 AWG
Working Strength35 kgf80 lb
Breaking Strength155 kgf350 lb
Minimum Working Bend Diameter25 mm1 in
Compatible WetLink PenetratorWLP-M06-4.5MM-HC
WLP-M10-4.5MM-HC
Electrical
DC Resistance @ 20°C0.0445 Ω / ft0.146 Ω / m
Voltage Rating300 VDC

Pinout

Standard Fathom ROV Tether

PairWireColorBinder Connector Pin #
Pair 1Wire 1Blue1
Wire 2Blue/White2
Pair 2Wire 1Orange3
Wire 2Orange/White4
Pair 3Wire 1Green5
Wire 2Green/White6
Pair 4Wire 1Brown7
Wire 2Brown/White8

Fathom Slim ROV Tether

PairWireColorBinder Connector Pin #
Pair 1Wire 1Blue1
Wire 2Blue/White2

Cross Section

Standard Fathom ROV Tether

Fathom Slim ROV Tether

Revision History

14 March 2022

  • FATHOM-TETHER-NB-4P-26AWG-XX-R3 – Initial Release
  • Updated preinstalled penetrator to WetLink Penetrator

7 August 2018

  • FATHOM-TETHER-NB-4P-26AWG-XX-R2 – Update to new construction with polyurethane foam jacket

3 November 2017

  • FATHOM-SLIM-NB-1P-26AWG-XX-R1 – Initial Release

Quick Start

1. Install the cable penetrator on a watertight enclosure end-cap, such as the back of the BlueROV2.

2. Firmly attach the tether to your vehicle by following the thimble strain relief tutorial or some other method that prevents the tether from pulling directly on the tether penetrator. The tether can twist the penetrator loose if you do not provide strain relief.

Guides

Thimble use with Fathom Tether and Fathom Slim Tether
Learn how to securely attach the Fathom Tether to a subsea vehicle!

Community

Blue Robotics Forum – Product Support