A 150-MHz coaxial line radar transmitter for the study of radar aurora

This paper describes 150-MHz, 20-kW coaxial line pulse transmitters constructed for the study of radar aurora. Tuned quarter-wave lines have been used in the high power r.f. amplifier stages and a novel method has been developed to decouple the r.f. input and output feed points from the anode and grid d.c. supply voltages. A solid-state pulse modulator provides the anode and screen power to to the final stage r.f. amplifier. The transmitters have been operated successfully at remote, unattended field stations, where reliability, stability of the output pulse power and self-protection shut-down controls were important design criteria.