By Robert E. Kenward
ISBN-10: 0124042422
ISBN-13: 9780124042421
Maintaining the introductory style of the now vintage First version, this revision contains all of the most modern concepts within the box. New details on equipment of radio tag harnessing, new sections on satellite tv for pc monitoring ideas and new forms of facts research are all integrated. nonetheless the single complete, up to date, advent to this primary method for flora and fauna and behavioral biologists. * a different consultant to the topic* complete insurance of the very most modern recommendations in either terrestrial and satellite tv for pc monitoring* particular, functional suggestions in easy methods to healthy tags, song animals, resource and assessment equipments and methods and examine ensuing information
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Additional resources for A Manual for Wildlife Radio Tagging, Second Edition
Example text
In some cases the manual gain control is supplemented by a signal attenuator switch. In this case, it is extremely important that the switch cannot be accidentally flicked into the 'attenuator on' position. The user of such equipment should be aware of the need to check the position of the attenuator switch before searching for distant tags. 1 Portable designs At frequencies above 140 MHz, the three-element Yagi is the most commonly used antenna for tracking on foot. When well tuned, this antenna has a gain of 6-7 dB over the '1\/2 dipole.
This is the case with the mainly urban and evening application of radio microphones. Sharing with military communications has been practical in some countries. Where there is a choice of frequencies, several factors must be taken into account, including antenna efficiency and directional accuracy, habitat effects on signal propagation, and ease of transmitter construction. Antenna dimensions are often expressed as fractions of a wavelength. These may be readily calculated from frequency, since radio waves travel at about 300 X 106 m s", by the formula: ----wavelength (A, in m) == - - - - 300 frequency (jin MHz) For instance, at 150 MHz the wavelength is 2 m.
In the upper band, there is little evidence of interference from radio microphones. However, a few powerful transmitters licensed to broadcast on other frequencies produce appreciable signals on harmonics within the band. Intermittent voice and data signals from these powerful transmitters are a nuisance when searching for wildlife tags from aircraft. In a world with continual increase in radio traffic, some governments are already charging commercial groups for allocation of frequencies. It therefore behoves biologists to be vigilant in defence of their frequency requirements.
A Manual for Wildlife Radio Tagging, Second Edition by Robert E. Kenward
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