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Hawkfinder Systems
In 1994 HAWKFINDER developed the worlds first medium-priced pocket size falconry telemetry system based on industrial telemetry modules. That system has been in continuous production ever since, and last year we added an ultra low cost system, & a super compact VHF set with telescopic antenna rods. We produce a range of Falconry Telemetry, Rocketry, & Pet Location Systems operating on UK/EU allocated bands The systems can operate on the UK VHF frequency 173 MHz , (173.225), the worldwide frequency 433/434 MHz UHF, (433.92), and the obsolete UHF frequency 418 MHz. (mainly for compatibility with friends/clubs). We can supply CE compliant transmitters for most systems which have been sold legally in the UK, but we DO NOT supply on 216 MHz. Both Receivers & Transmitters are CE marked & compliant with all relevant CE regulations Weare the UK’s largest manufacturer of UHF Falconry Telemetry and enjoy an enviable reputation for reliability, performance and quality. Our receivers are so reliable that we are now able to offer a five-year warranty on our premium models. VHF v UHF & operating range There are differences in the transmission characteristics between VHF & UHF. Range is dependent on height of transmitter & receiver and nature of intervening terrain, and on operating band. UHF offers lower cost, smaller size & superior performance from tree height, in (or just above) wooded or broken terrain, and offers height gain advantages and more accuracy, whereas VHF which gives better signal curvature over intervening barriers and offers greater range under many conditions, particularly from a transmitter positioned low to the ground, and thus gives an excellent minimum operating radius. For both bands, under optimum conditions, a system will track an airborne falcon for up to 30-40 miles, (up to 50 for VHF) or locate a hawk in a tree at distances up to 10-15 miles.
To generalise, for ranges up to around 1 mile UHF is better. For ranges from about 1 mile to around 3-5 miles VHF is better. For ranges beyond this, there is probably not much to choose between them. In certain circumstances, one will give a better result, in others the opposite will apply. Whatever system is used, its range will be dictated by the height above ground of the transmitter and receiver. Maximum range will be achieved at a considerable height, the range at ground level being only 10-30% of this. Thus if a bird is out of range go to the nearest high ground to sweep for it. Transmitter batteries should be changed with an adequate reserve, otherwise they may run out five minutes after losing your bird. You should always carry a spare receiver battery. Hawkfinder H-Beam Technology Hawkfinder systems are built around our unique H-Beam which offers performance to match a 5-element yagi, yet has a length of only half that of a typical 3 element yagi. The detachable elements (telescopic at VHF) are/close to 7" or less. Most yagis give rise to side lobes (areas of unwanted high gain at the sides) together with a pronounced back lobe. The H-Beam gives an almost perfect cardoid (heart shaped) detection pattern with more forward gain, which steadily reduces towards the back, culiminating in a deep and very noticeable "Null" at the back. This makes Hawkfinder systems true geometric trackers, rather than just audio trackers |
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Copyright
P.T. Chapman 1990-2007
