By Robert E. Kenward
Keeping the introductory taste of the now vintage First variation, this revision contains the entire most up-to-date recommendations within the box. New details on equipment of radio tag harnessing, new sections on satellite tv for pc monitoring thoughts and new varieties of facts research are all incorporated. nonetheless the single accomplished, up to date, advent to this primary process for natural world and behavioral biologists. * a different consultant to the topic* complete insurance of the very most modern concepts in either terrestrial and satellite tv for pc monitoring* specified, useful assistance in how one can healthy tags, song animals, resource and evaluation equipments and methods and examine ensuing facts
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Additional info for A Manual for Wildlife Radio Tagging, Second Edition
The next section of this Basic Equipment 41 chapter outlines these other aspects of tag design. There is guidance on the principles that dictate choice of tag type, life and other options, but decisions on these issues must also involve tag manufacturers, who have specific information on their products and on projects that have used them. Advice on buying tags, and on building tags from purchased transmitters, is given in Chapters 4 and 5. However, the need for timely consultation with manufacturers, and of placing orders well before the transmitters or completed tags will be needed, cannot be stressed too highly.
14 dB). g. , 1974; Kolz and Johnson, 1975; Cederlund and Lemnell, 1980). For instance, adding elements to a Yagi antenna increases both its gain (Fig. 10) and its accuracy. Thus, a twelve-element Yagi has a gain of about 14dB over a dipole, and some 7 dB over a three-element Yagi. This gain is not achieved without cost, however, because the higher the gain the narrower the angle (beamwidth) in which it can be obtained. The peak gain of a Yagi is obtained with the antenna pointing directly at the signal source, and this drops by 3 dB when a three-element Yagi points about 30° to either side of this line, giving a total half-power beamwidth of 60° (Fig.
3 Fixed stations For non-directional recording of activity data or other telemetered information, many projects use a vertical whip with ground plane elements (Amlaner, 1980; ARRL, 1984) placed near the centre of the study area. Sometimes, however, the recording site is to one side of the study area, because of local topography or because of a convenient building in which to keep the receiving system. In this case it is often wise to use a Yagi antenna. The distance and width of the study area will determine the optimum number of Yagi elements, bearing in mind that gain increases at the expense of beamwidth.