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© Joseph Naccarato 2016
Tag
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TW-1/2AA
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TW-2/3AA
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TW-AAx2
Our TW series of VHF tags have been used on thousands of projects over decades, facillitating data for researchers around the world.
Decide on the right balance of signal strength, operating life and sensing options, then specify the ideal tag for your study, with expert guidance from one of our Avian Telemetry Specialists.
For species that can take collars, see our VHF collars
• Strong signal strength for their size
• Successfully used for decades
• Choose Tag life versus Signal Strength
• Many customisations possible to suit the vast array of wonderful creatures you would like to track
While GPS and other technologies reduce labour costs, there are times when those technologies simply don’t work. For example, if animals do not get clear views of the sky then GPS locations may be infrequent or even unobtainable, or the data may not be transmitted far enough. Moreover, often you can get more locations by tracking manually for the same weight of tag by using VHF.
VHF tags allow you to find the your tagged individual in the field which can be important, for example
They are therefore ideal for looking at local home-range movements, survival and sociality.
The traditional beeper VHF has advantages over coded VHF when tracking manually; you can tune to an individual frequency and not have interference from other tags, plus the tags pulse quicker which makes direction finding much easier. Nevertheless, they can still be logged using our SRX receivers.
VHF tags require a receiver and antenna to track the tag.
Case Studies
Walls S., Kenward, R. and Holloway, G. 2005. Weather to disperse Evidence that climatic conditions affect vertebrate dispersal. Journal of Animal Ecology 74: 190-197.
Walls, S.S. & Kenward, R.E. 2001. Spatial consequences of relatedness and age in buzzards. Animal Behaviour 61: 1069-1078.
Kenward, R.E., Hall, D.G., Walls, S.S. & Hodder, K.H. 2001. Factors affecting predation by buzzards (Buteo buteo) on released pheasants (Phasianus colchicus). Journal of Applied Ecology 38: 813-822.
Kenward, R. E., Walls, S. S., Hodder, K. H., Pahkala, M., Freeman, S. N. & Simpson, V. R. 2000. The prevalence of non-breeders in raptor populations: evidence from rings, radio-tags and transect surveys. Oikos 91: 271–279.
We can customise these tags to suit your species and study aims. contact one of our Telemetry Specialists to get the optimal tag for your project.
| Model | Weight (g) | Life (days) | Size (LxWxH) (mm) |
| TW-CR2032 | 6 | 250 | 24 x 24 x 15 |
| TW-10-28 | 10 | 550 | 37 x 17 x 18 |
| TW-1/2AA | 15 | 1100 | 40 x 20 x 21 |
| TW-2/3AA | 20 | 1800 | 50 x 20 x 21 |
| TW-AA | 30 | 2100 | 66 x 20 x 21 |
| TW-1/2AAx2 | 30 | 2100 | 40 x 30 x 21 |
| TW-2/3AAx2 | 40 | 4500 | 60 x 30 x 21 |
| TW-AAx2 | 65 | 5250 | 66 x 30 x 21 |
1. Minimum weight. Tags for some species require extra protection or range that can increase the weight.
2. Maximum life based on pulse length 12 ms and pulse rate 30 pulses per minute at 25°C
