Abstract
A radiotelemetry transmitter conforming to British Governmental specifications for biomedical telemetry has been devised for either intermittent or continuous recording of intra-arterial pressure in fully ambulant subjects. A1 kHz subcarrier is frequency modulated by the pressure waveform, the subcarrier being in turn frequency modulated on to a crystal-controlled oscillator at 17·060 MHz which, after frequency multiplication, produces an output to drive an integral halfwave aerial at 102·360 MHz. The apparatus has been successfully used for monitoring for periods of 3 to 36 h.
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