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An RCA 1802 microprocessor is used to locate fish in a 400 m outdoor experimental channel at the US EPA Monticello Ecological Research Station. The system consists of horizontally polarized antennas spaced at 30m intervals. The antennas are sequentially switched into a microprocessor controls all timing, switching and maeasurement functions. Each fish in this system is tagged with a rf tag which has a unique frequency in the 53 MHz band. Selecting a particular fish for tracking is equivalent to changing the frequency tuned on the receiver. A microprocessor determines the antenna sending the maximum signal level and prints out this data along with fish number and time of day. A signal to noise margin is calculated by comparing the average signal level to the signal level from the antenna closest to the fish. (ERA citation 05:032790)