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  • Avian Transmitters
    • Solar PTTs
      • 2g Solar
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      • 9.5g Solar
      • 12g Solar
      • 18g Solar
      • 35g Solar
      • 50g Solar
    • Solar Argos/GPS PTTs
      • 17g Solar Argos/GPS
      • 22g Solar Argos/GPS
      • 30g Solar Argos/GPS
      • 45g Solar Argos/GPS
      • 50g Solar Argos/GPS Patagial
      • 70g Solar Argos/GPS
    • Battery Powered PTTs
      • 45g PTT
      • 95g PTT
      • 105g Argos/GPS LC4™
    • Implantable PTTs
      • 26g Implantable
      • 38g Implantable
    • GPS/GSM 20-70 Transmitters
      • 25g Transmitter
      • 30g Transmitter
      • 45g Transmitter
      • 50g Patagial Transmitter
      • 70g Transmitter
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  • Marine Transmitters
    • PSAT PTT-100
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IMPLANTABLE PTTs

For certain species that may not tolerate a backpack attachment, particularly aquatic diving birds, we offer two sizes of Implantable PTTs. These specialized PTTs are optimized for operation at body temperature, are hermetically sealed in a biologically inert material, and can also be made extra pressure resistant for deep-diving species.


Implantable PTT models



Minimum
Bird Weight*
Estimated Transmission Lifetime** Optional Double
Battery Lifetime

867 grams

~400 hours

N/A

1267 grams

~750 hours
~2025 hours


Argos Doppler Locations

Implantable PTTs transmit messages to the Argos satellite constellation. As a satellite passes overhead and receives those messages, a PTT's location is estimated using the perceived Doppler shift in signal frequency of successive transmissions. Triangulating PTTs' positions in this manner yields locations which are then categorized into "location classes" (LC) based upon their estimated accuracy. Over two-thirds of Argos locations provided by MTI PTTs are in the top three location classes:***
LC3: <250 m radius
LC2: <500 m radius
LC1: <1500 m radius
Please note that Implantable PTTs are not equipped with GPS.

Programmable Duty Cycles

PTTs are programmed with a user-defined duty cycle that dictates when the device will turn ON to transmit and OFF to conserve power. The customizability of these transmission intervals allows PTTs to best accommodate the activity of the species being studied and the project objectives, as well as to budget the battery life of the PTT over the study period, thus extending the usable lifetime of the transmitter.

Ground Track (GT™) Option

PTTs can be programmed with GT™. This feature enables a PTT to also function as a conventional radio transmitter, emitting a UHF frequency at prespecified times that can be heard via a Yagi antenna and receiver. Seasonal GT™ is helpful for locating birds in real time and pinpointing injured study subjects. Mortality GT™ for Implantable PTTs is temperature-sensitive, meaning a PTT will emit UHF signals and switch to continuous Argos transmission if its temperature drops below body temperature, thus allowing for the swift location of deceased birds. Please note that the additional power required for GT™ will reduce the operational lifetime of a PTT.



* While conventional thinking suggests choosing a transmitter weighing <3% of a bird's weight, we are aware that birds routinely carry weights greater, and sometimes less, than 3% of their body weight. Because each species is different, it is crucial that you review the literature on your study species and use proper discretion to determine the appropriate transmitter model for your project.

** Estimated transmission lifetimes based on a 6 hours ON / 72 hours OFF duty cycle.

*** Based on 2016 internal test data.

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