ri-2dtygon ri-2ddacron ri-2dchain

These units are designed as collar mounts for gallinaceous birds from quail to capercaillie. They can also be fitted to small mammals such as squirrels, rabbits, primates, and large bats.


Model Weight Standard Life Lifespan range Dimensions: L x W x H (mm)
RI-2D 7.5g 12 months 6-18 months 20 x 14 x 11
RI-2D 9.0g 18 months 12-18 months 27 x 14 x 11
RI-2D 11g 24 months 12-24 months 37 x 14 x 11
RI-2D 15g 30 months 12-36 months 26 x 19 x 15
RI-2D 22g 36 months 24-60 months 35 x 16 x 17

Frequency Range: 138 to 235 MHz.

Transmitter: Crystal controlled two-stage design, pulsed by a CMOS multivibrator.

Pulse Width (standard): 24 milliseconds (ms). Available from 22-30ms.

Pulse Rate (standard): 40 pulses per minute (ppm). Available from 20-120ppm.

Power Output: Set to use available battery power over the required transmitter life.

Housing: The battery and transmitter are encapsulated in an inert waterproof epoxy.

Attachment: A number of mounting options are available, such as an elastic or Dacron line neckloop, a wire loop for collar attachment, or a bead chain as a necklace.

Antenna: Stranded stainless steel cable covered with a black nylon coating. One or two layers of shrinkable tubing reinforce the antenna at its base.

Activation: Removing an external magnet starts the transmitter. Replacing it stops the transmitter.


Mortality (suffix “M”): The available delay is 12 hours. The 12 hour delay circuit indicates its activation by increasing the pulse rate from a nominal ~42 ppm to ~75 ppm. After the mortality mode has been triggered, any motion resets the transmitter to the normal pulse rate. This option adds ~0.5g to the finished weight of each transmitter.

Activity (suffix “A”): Every motion event exceeding a preset range of angles generates one extra pulse between the normal pulses. This activity pulse is distinctively shorter (~12 ms) than the normal pulses. This option adds ~0.5g to the finished weight of each transmitter.

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 ~15 ppm at 0°C to ~50 ppm at 40°C. Each transmitter is supplied with a plotted calibration curve. This option adds ~0.05g to the finished weight of each transmitter.

Position (suffix “P”): The pulse rate switches from ~24 ppm to ~50 ppm when the animal changes body position, pivoting the transmitter 10° or more from a preset orientation. This option adds ~0.5g to the finished weight of each transmitter.



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