Transmitter for Telemetry of Biological Data from Birds in Flight

This paper describes a light weight, rugged, frequency modulated high frequency (HF) transmitter designed for telemetering biological data from birds in flight. The transmitter, including the batteries, weighs 36 grams, operates at 230 mc, produces 3 milliwatts of power, measures 3 inches in length and 1.25 inches in diameter, and has a range of 0.5 mile. It can be carried by pigeons and birds of larger size.