Abstract
Beat-to-beat blood pressure in a free ranging dog within laboratory has been measured by a simple F. M. monolithic transmitter with chronic intra-arterial cannulation. The oscillator was modulated directly by semiconductor pressure transducer changing E base. Center of irradiated frequency was 78MHz. A conventional F. M. radio was used as signal receiver and also as demodulator, since DC signal output could be taken between center of AFC switch and common base. The calibrated DC output was 76.4mV per 100mmHg and linear up to ±300mmHg. Maximum telemetered distance of the system was 30 meters in an ideal condition. Single battery, H-2D, 2.6V survived 130 hours without changing DC output.
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