The electronic tether project consists of an interrogator and transponder unit which are both portable. The interrogator is powered by two AA batteries and the transponder by two button cell batteries. The interrogator unit consists of digital components including a microprocessor, two VCOs, and RF equipment. These VC0s have an equivalent load of 167 ohms while operating at 3 V and the microprocessor is 333 ohms at 5V. For this reason, there are two DC to DC up converters on the interrogator which maintain constant output until the input level drops beneath 1.6V. The transponder consists of digital components and one VCO. One DC to DC converter is required for the 3 V required by the VCO. The converters have low power indicators which trigger an alarm when the input voltage falls beneath 2V.
 

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