Holohil Systems Ltd. RI-2D

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 and large fruit bats.

Frequency Range: 138 to 235 MHz.

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

Pulse Width & Rate: 20 to 24 ms, nominal 0.6p/s (36p/m).

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, tubes for the passage of harness material, or a wire loop for attachment to a necklace. See diagrams below.

Antenna: Stranded stainless steel cable covered with a black nylon coating.

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

Mortality (suffix "M"): After a nominal delay of 12 hours the pulse rate increases from a nominal ~42 p/m to ~75 p/m. 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.

Left: RI-2D (7.5g) with wire collar and Tygon tubing forming collar.
Right: RI-2D (12g) with Dacron and heat shrinkable tubing forming collar.




When used on bats, the transmitter is placed on the back of the neck and the antenna emerges from the center of the transmitter and lies down the back. A small amount of glue under the transmitter prevents it from rotating on the neck

Diagrams represent examples of configurations used by various researchers. Battery size will vary depending on lifespan required. Antennas may be longer.

MISC. ANIMALS