Abstract
Summary
A transmitter for radio telemetering a wide range of physiological phenomena has been described. It consists of a small (65 gram over-all weight) three-transistor device with a minimum number of components, having a usable frequency spectrum from 0.1 to 10,000 cycles per second. It offers an input impedance of 500,000 ohms. The system is versatile because a low frequency response can be added or eliminated depending upon the recording needs. It uses a single cell battery which has a life of approximately 330 hours.
The transmitter has been used to telemeter and to allow recording of electroencephalograms, electrocardiograms, and respiratory rates from cattle, sheep, chickens and pigeons. Tracings made simultaneously by a direct wire system and radio telemetry were comparable in quality.
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