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R. Bögel, G. Fluch et al.:
"A Six-Channel Telemetry System For The Acquisition Of Eco-Physiological Parameters Of Wild Animals";
Vortrag: XVI International Conference on Biotelemetry, Wien; 06.05.2001 - 11.05.2001; in: "Proceedings of the XVI International Symposium on Biotelemetry", (2001), S. 28.

Based on earlier designs (Schober et. al. 1997), a six-channel telemetry system for the acquisition of the following parameters was developed: 1) heart rate, 2) body temperature, 3) ambient temperature, 4) air pressure, 5) movement, and 6) changes in head orientation. Endogenous parameters are processed by an implanted unit and transferred to an external repeater via a digital data link. The repeater system handles various tasks: i) reception of internal parameters, ii) recording of external parameters, iii) coding and transmission of all parameters according to a pulse duration / pulse interval modulation mode (PDM/PIM of carrying frequency), and iv) on-board storage of data in a non-volatile memory. The air pressure measurements serve as a barometric altitude metering relative to reference air pressure levels. Animal activities are indicated by transmitter movements (acceleration sensor) and changes in head orientation (mercury switch). After retrieval of the repeater, on-board data can be downloaded via an infrared data link. Both units are microprocessor controlled. Therefore, programming of the data sampling routines and on-board data aggregation can be altered according to the specific study needs. For real-time data recording, a telemetry receiving system was developed which consists of 1 or more micro-processor-controlled receiving stations which are based on a B+R 2360 receiver. These receiving stations are controlled via a RS232-interface by a IBM-PC software program. This software package handles channel selection and scanning, frequency fine tune, gain control and storage of all parameters. Utility software modules with filter and data resampling options are available. The system works in the 2 m band and is designed for distances of up to 5 kilometers (10 mW ERP).