How To Design Tracking Devices To Study Wild Animals
journal article
The Journal of Wild animals Direction
, pp. 9-24 (16 pages)
Published By: Wiley
https://www. jstor .org/stable/3797775
This system of radio location has been used on rabbits (Sylvilagus floridanus), striped skunks (Mephitis mephitis), and raccoons (Procyon lotor). Size, weight, life, physical and electrical stability, and radiated power are of import parameters of the transmitter. Mercury cells provide nigh 115 milliwatt hours per gram and were chosen every bit the transmitter power source. The transmitter is a transistor, crystal-controlled oscillator with the tank coil for the oscillator interim also as a magnetic dipole transmitting antenna. Antenna efficiencies of the order of 0.1 percent are obtained, yielding radiated ability in the sub-microwatt region. The antenna is constructed of copper or aluminum and has a figure eight directional pattern. The consummate transmitter without batteries weighs approximately 10 grams and costs approximately $viii.00 for parts. Instructions for building transmitters are given. Transmitters were attached to rabbits and skunks by means of harnesses and to rabbits, skunks, and raccoons past collars. The harnesses did not prove satisfactory for long-term attachment. The receiver is a portable, bombardment-powered unit of measurement weighing ten lbs including the batteries. Information technology is crystal controlled on 44 switched channels with a four db noise figure and a 30 CPS bandwidth. A receiving system was assembled with commercially available units and used successfully for tracking skunks. The components of this system are a armed forces surplus receiver (BC-453), a radio range filter (FL-13), and ii transistorized radio frequency converters. The portable receiver is well adjusted for tracking on foot using the cipher of its attached loop antenna for obtaining bearings on the animals carrying transmitters. The transmitters operate on different frequencies to avert interference in taking bearings and to provide for private identification.
The Journal of Wildlife Management contains data from original research that contributes to the scientific foundations of wild fauna management. Suitable topics include the results and interpretations of investigations into the biology and ecology of wild fauna that tin can be used for management.
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The Periodical of Wildlife Management © 1963 Wiley
Source: https://www.jstor.org/stable/3797775
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