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man using a hand held antenna to do radio telemetry wildlife tracking.


Operate Your Transmitters

Turning transmitters on and off

  • You should have received a one page sheet with your order, explaining how your VHF transmitters operate. It's also available here.
  • After unpacking, ensure all transmitters are off by monitoring each frequency with a telemetry receiver.
  • Each transmitter has an on/off reed switch controlled by a magnet.
  • If the on/off reed switch is not visible through the transmitter resin, dots indicate where the magnet should be placed.
  • When the magnet is affixed, the transmitter will be off. As soon as the magnet is removed, the transmitter is on and enters a start-up mode.

Checking transmitter operation

  • Important: prior to releasing the animal, and after removing the magnet, confirm your transmitters are operating by monitoring each transmitter’s frequency, (even if you have previously checked them).
  • Occasionally, the reed switch may stick in the off position. A light tapping of the transmitter should activate the switch.
  • Transmitters with microprocessors will transmit from 16 to 50 start-up pulses when the magnet is removed, prior to beginning a normal pulse rate.

Storing your transmitters

  • Separate them by at least 5 cm. (2 in.) so the magnets do not “cancel” each other, and allow the transmitters to turn on inadvertently.
  • Larger transmitters can be programmed (designated as micro-processor controlled) and can include features like mortality, duty cycle, etc.
  • Some models offer an increased range option (a two stage vs. a three stage circuit), indicated with a “B” suffix.
  • Higher pulse rates and widths reduce transmitter life, lower increase life.
  • Store in a cool, dry location, away from heating sources.

Using mortality, duty cycle, and trap transmitters

  • A mortality program option will start-up in the mortality mode after the magnet is removed. Shake the transmitter to reset the mortality switch and program.
  • A duty cycle program turns the transmitter on and off at pre-programmed intervals. If the magnet is removed, the program resets its clock. The most recent removal of magnet determines when the program begins.
  • After the transmitter has been started, keep all magnets away from transmitters to avoid restarting the program.
  • Keep the data sheet(s) and job number sent with your order for future reference..
  • Details on trap transmitter operation can be found here. Additional details regarding the decoding of PET transmitters is here.

100% Satisfaction, Guaranteed

We provide a 100% satisfaction guarantee on all transmitters equal to one half the battery life (in days), up to two years; up to three years on select collars.