These units are designed to be mounted (glue or bolt-on) the carapace of turtles.
|Model||Weight||Standard Life||Lifespan range||Dimensions: L x Diameter (mm)|
|SB-2F||4.8g||5 months||3-6 months||14 x 9.5|
|SB-2F||6.0g||10 months||6-12 months||19 x 9.5|
Note: Because the larger (6.0g – 10 month) SB-2C unit uses two batteries in parallel, it must not be stored for more than 2 months prior to use.
Frequency Range: 138 – 235 MHz.
Transmitter: Crystal controlled two-stage design pulsed by a multivibrator.
Pulse Width (standard): 19 milliseconds.
Pulse Rate (standard): 35 pulses per minute (ppm). Available from 20-120ppm.
Power Output: Set to use available battery power over the required transmitter life.
Activation: Removing an external magnet starts the transmitter. Replacing the magnet stops the transmitter.
Housing: The battery and transmitter are hermetically sealed in a brass case.
Attachment: Brass tabs are attached at the mid-point or at the ends for screw attachment to a turtle carapace. The transmitter is usually mounted above a back leg.
Antenna: Stranded stainless steel cable covered with a black nylon coating. Additional layers of shrinkable tubing and/or a spring reinforce the antenna at its base.
Temperature (suffix “T”): An increase or decrease in temperature results in a corresponding increase or decrease in pulse rate. At the standard settings, the pulse rate changes from ~25 ppm at 0°C to ~40 ppm at 40°C. Each transmitter is supplied with a plotted calibration curve. This option adds ~0.05g to the finished weight of the transmitter.