Fixed System Considerations
Why we raise important points requiring a response from you
Scarecrow's fixed systems represent an entirely novel scientific approach to bird control and dispersal which is both humane and hygienic and does not harm the birds.
Scarecrow's fixed systems are intended for permanent installation at sites with a major bird problem – Marinas, Ships, Docks, Harbours, Beaches, Offshore Helidecs, Oil and Gas Platforms, Public Buildings and Places, Historic Buildings – anywhere that birds present a safety or health hazard, or just plain nuisance.
Importantly, natural bird calls played at natural levels are not intrusive and sometimes not even noticed in places where the public may be present; not so with any other, unnatural, sounds, holography, dummy birds or flashing lights, to which birds may eventually become habituated.
The areas and structures that are, or are likely to be, occupied by birds have to be fully identified; this means defining the areas to be properly covered by the loudspeakers to be installed, with the object of minimising ‘overspill’ to surrounding areas, where their sound may be intrusive and unnecessary.
Using fully automatic and ‘random’ electronic processors, dispersal can take place without human intervention 24 hours a day, or from dawn to dusk, as the location demands.
About the loudspeakers we use
Scarecrow engineers use only high quality, high efficiency, loudspeakers designed for external use in all types of environments and weather conditions, including for use where there is a potential for explosion or chemical hazard.
All the loudspeakers we use are defined as re-entrant horns; a small efficient ‘driver’ feeds sound into a specially designed tube of increasing diameter and of a length calculated to perform to a required efficiency and frequency response.
Generally, the larger the horn in length and final diameter, the greater the efficiency and directivity. The horn is folded within itself – the reason they are called re-entrant horns – to make them smaller and therefore less environmentally obtrusive, yet maintaining sound quality and efficiency.
By using their directional properties and installing an appropriate number of loudspeakers, it is possible to very efficiently cover the area from where birds are to be dispersed and keep most of the reproduced sounds within the area, with minimum overspill.
External Mounting Considerations
When installed outside, the effect of wind and temperature can modify the directional characteristics of horn loudspeakers. This will be most noticeable when installed on the flat roof of a building in full sunlight and the following diagrams demonstrate how the sound will be affected.
