VHF Systems for Marine Applications

Most marine applications utilize satellite-linked transmitters working through the Iridium or Argos systems, and utilizing salt-water-switch technology to synchronize position attempts and transmissions with surfacings. However, there are applications where users want a VHF transmitter to aid in recovery of devices (e.g. floats, buoys, UAVs, balloons) or for what is typically short-term active tracking of marine mammals. Users must be aware that VHF transmissions are blocked by seawater, so signals will be detected only when the transmitter is out of the water.

Some of the Telonics models that have typically been utilized in such applications are highlighted below; however, other models could potentially be customized in similar ways.

Models

The “MOD” models listed below are fully-hermetically sealed for maximum reliability, with the transmitter, battery, and interconnects sealed into a single metal housing. This is the same technology used by NASA for maintaining high performance electronics in harsh environments. With hermetic packaging, there is no problem with moisture penetration even after years of deployment, except in cases of severe physical damage to the canister. No polymeric packaging offers this level of reliability.

Model Dimensions L x W x H (in, cm) Weight (g) Battery Life (months)
MOD-080-3 1.3 x 0.7 x 0.9
3.3 x 1.8 x 2.3
36 8.0
MOD-125-3 1.6 x 0.9 x 0.8
4.1 x 2.3 x 2.0
53 12.0
MOD-210-3 1.7 x 1.3 x 0.7
4.3 x 3.3 x 1.8
75 16.0
MOD-225-3 1.8 x 1.3 x 0.7
4.6 x 3.3 x 1.8
85 19.8

Battery lives listed above are calculated using Telonics Product Programmer (TPP), with assumptions of standard power, 60 beats per minute, and operation 24-hours per day at 10°C. Operation for extended periods at lower temperatures will decrease operational life. For short-term projects, users may opt for faster pulse rates and higher output power, which would decrease battery life.

Key Features

  • When used in marine applications these units typically are provided with the CAST-2 (antenna end cast), and sometimes CAST-3 (internal cast) options.
  • The listed models can use either Telonics MK-11 or MK-12 electronics, excepting the MOD-050, which only uses the MK-12. Both the MK-11 and MK-12 are microprocessor-controlled transmitters which can be programmed using Telonics Product Programmer (TPP). The MK-11 has synthesized frequencies programmed through TPP; the MK-12 is crystal controlled.
  • Customized transmission duty cycling (on/off periods) is available, including seasonal cycles which can vary throughout the life of the transmitter. All timing is controlled by a Real-Time-Clock, which allows seasons to start and end on any desired calendar date and time and sensor data to be accurately time stamped.
  • MS6 mortality-motion option available at no additional charge. (Note that this option, where "mortality" is triggered based on lack of motion may have limited application in marine applications.) Other sensor options are available, including the MA activity option, MS4 temperature option, and MS5 temperature-triggered mortality option (sensor descriptions are provided below).
  • Data Logging Option 350 is available to store mortality, activity, and/or temperature data in transmitter memory for download if the transmitter can be recovered.
  • Transmission power levels are selectable to accommodate either greater range or greater life.

Sensor Options for VHF Transmitters using the MK-11 or MK-12 Electronics

MK-11 or MK-12 Sensor Options

Data Logging Option (Option 350)

Specifications for Transmitter Electronics

MK11/12 Transmitter General Specifications

Photo Gallery

Related Products

Satellite-linked systems are frequently used on marine turtles, including:

Implantable transmitters are frequently used on snakes and lizards.

Legacy Products

This information on discontinued products is provided for individuals who are still using these older systems. Product descriptions may be time sensitive or even outdated. Please contact Telonics if you have questions.

Telonics supports these products as possible based on availability of parts, software, or other considerations; but no longer sells them new.

Lithium Battery Shipping Regulations

Telonics Inc. ships all systems containing lithium batteries in accordance with the US Department of Transportation rules for hazardous materials set forth in 49CFR and the IATA Dangerous Goods Regulations.

Shipping dangerous goods can be complicated and confusing, consult a dangerous goods specialist if needed. The general requirements for shipping lithium batteries according to 49CFR are located in Part 173, Subpart 173.185 in the link below.
http://www.ecfr.gov/cgi-bin/text-idx?SID=e8334217c2c8d081457a5156872ad037&tpl=/ecfrbrowse/Title49/49cfrv2_02.tpl#0

Service Commitment

Since 1970, Telonics has built a reputation based on product quality, product support, service, and customer satisfaction. Telonics strives to produce the highest quality products, and to support those products accordingly.

Because of extreme conditions and the unpredictable nature associated with most telemetry applications, problems occasionally arise. Most problems can be resolved quickly. In all cases, we hope to be able to work in partnership with users to resolve problems to the user's satisfaction and to uphold our demonstrated commitment to excellence. If problems should arise, all products must be returned to our factory for failure analysis.

Warranty: VHF Transmitting Subsystems