A Logarithmic Response Resistor-Capacitor Telemetry Modulator.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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A unique electronic circuit has been developed for use in a rocket-borne temperature sonde to convert a thermistor resistance to a modulation frequency for telemetry application. The modulators frequency versus resistance curve drifts less than 4 as the temperature of the electronics varies from 60C to -60C. The drift is easily corrected by including a reference circuit in the sonde. The modulator can be made almost entirely insensitive to power supply voltage changes, and can be made to dissipate less than 0.1-microwatt power in the thermistor without degrading resolution, temperature stability, or voltage stability. Because it passes alternating current through the thermistor, it possesses a nearly logarithmic frequency versus resistance curve with a resistor-capacitor R-C network instead of a transistor.
- Atmospheric Physics