Product details - Large Mammal Transmitter
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| Cheetah, Hwange National Park, Zimbabwe with large mammal transmitter © Chris Pfefferkorn |
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| Large mammal transmitter worn by a moose © John Arnemo |
Description:
Large mammal transmitters are a variation of the standard two stage transmitters which are used predominantly on medium to large sized animals. The capacitance of larger animals necks has a tendancy to absorb more radiated radio signal. The higher power output of the large mammal transmitter accomodates for this at a small expense to transmitter life compared to a standard two stage transmitter. They carry all the same available features as the standard two stage transmitters.
Features:
With the addition of a excellent linear digital temperature sensor, the transmitter can be used to measure temperature. The sensor has an accuracy of ± 0.5ºC with a resolution of 0.0625ºC.
The transmitters life can be extended to a long life version with the addition of a larger resistor. In some situations this is useful especially when range is not critical as the extra life comes at the expense of around 30% of the regular range.
The transmitter can be programmed to turn itself on and off in any sequence, called a duty cycle, e.g. 1 week on 1 week off, or 15 hours on and 9 hours off in a 24 hour period to extend the battery life. This is useful if you are only going to be tracking at certain known times.
With the addition of a small mercury switch the transmitter can be converted to a mortality and/or activity transmitter. It can be programmed to change its pulse rate to any higher or lower rate after a preset period of inactivity, indicating mortality or resting state. It can also be programmed to return to the normal pulse rate if/when movement or activity is resumed. Should the transmitter go into mortality mode, it can be further programmed to measure accurately the Time Since Death (TSD).
The mercury switch can also be used as a tilt switch to change the pulse rate as the transmitter moves through different pre-determined angles. This technique is used to determine animal posture and behaviour.
Feature summary: |
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| Transmitter life | Determined by pulse rate and battery size. The range varies from 1.5 months to 6 years and more. Contact us for life estimates. |
| Transmitter range | The range of large mammal transmitters, like all transmitters, depends upon its antenna, the environment and the quality of the receiving equipment. With a good whip antenna and line of sight; ground-to-ground ranges in the order of 2-5 kilometres are typical. |
| Pulse rates | Set during manufacture, typically 40 ppm to optimise life of transmitter with ease of tracking. |
| Pulse width | Typically 18ms to optimise life with ease of tracking. |
| Housing | Transmitters and cells are hermetically sealed with inert epoxy resins that are available in a range of colours upon request. Dental acrylic is often used for extra stength. |
| Activation | The transmitter is switched on and off by activating a reed switch with the swipe of a magnet. |
| Antenna | Typically stranded stainless steel wire with nylon coating of a variety of gauges and lengths. The antenna is virtually always a whip to maximise range. |
| Frequency range | 142-216MHz. |
| Frequency tolerance | ±3KHz from nominal frequency at -20ºC to 70ºC. |
| Power output | Typically 12-15mW. |
| Battery type | 3.6V Lithium. |
| Number of batteries | Typically one, but can have multiple in parallel for increased capacity. |
| Life | Rated shelf life of 10 years. |
| Min. temperature | -25°C. |
| Max. temperature | 80°C. |
| Weight | Typically used on collars 200g and upward, but not limited to this. |
| Colour | Black by default, variable upon request. |
| Attachment options | Collar, |
Animal suitability:
Testimonials:
I am really impressed with your workmanship of the collars and your great service in ensuring we got the equipment as fast as possible.
Thank you very much for all your trouble and please send my compliments to your team and all staff involved on a job well done.
Erik Muller, leopard research, Botswana
I would recommend Sirtrack, they are a great company to deal with aswell as always having the latest updates on collars.
Dr Greg Rasmussen, wild dog research, Zimbabwe
In Nov 99 we received 10 mortality radio collars for red deer and were very satisfied with the quality and prompt shipment. May I make another order of five collars of the same features.
Uros Kolar, Red Deer research, Slovenia
Just a quick note to say the leopard collars have arrived, thanks again for the great and speedy work.
Dr Luke Hunter, Carnivore Research, South Africa
My contact at Sirtrack is Kevin Lay and they are exceedingly helpful not only with design mods, but also tailor making collar output and life span to your exact needs.
Dr Greg Rasmussen, wild dog research, Zimbabwe
Sirtrack collars designed to last 3 years on feral goats have outlasted specifications spectacularly! Collar 150.462 released 10/4/97, recovered 18/11/03:6 years, 7 months and 18 days and still going loud and clear!!!!! Collar 150.060 released 16/10/98, recovered 18/11/03: 5 years, 1 month and 2 days and still beeping, well done and thanks.
Peter Fleming
Thanks so much for the prompt help and trial of the receiver, we are having good luck with Sirtrack collars and appreciate the kind of attention you give us.
Megan Parker, Wild Dog Research.
The two collars are on and working well. They get as good a range as the others that I have that cost twice the price.
Glyn Maude, Brown Hyaena research, Botswana
We are really satisfied with the deer collars. We are using them for the third year and still going full power with the strength and range of the signal still exactly the same.
Miha Adamic, Singapore
