Furuno Electric Company Limited

Asao Kitabatake

Minoru Handa

Akio Funae

Hitoshi Ueda

Naozumi Tamaoka

Kazutaka Ishida

Kenichi Wada

Hideki Tanaka

The invention provides a magnetron drive circuit which drives a magnetron to produce a generally rectangular-shaped narrow transmission pulse having sharply shaped rising and falling edges. The magnetron drive circuit includes a nonlinear load circuit and an active damper circuit. The nonlinear load circuit becomes on at around 80% of a peak output voltage of a pulse transformer (at which the magnetron begins to oscillate) is connected to a secondary winding of the pulse transformer in parallel with the magnetron. The active damper circuit absorbs residual energy left in the pulse transformer without any need for an absorption resistor conventionally connected between both ends of a primary winding of the pulse transformer.

Magnetron drive circuit

Antenna orienting apparatus for vehicles

Position detecting device for use with omega navigating apparatus which includes a receiver for receiving two omega signals from different stations, a synchronous generator for producing first and second signals synchronized with the omega signals and frequency dividing the synchronized signals by a common divisor to produce first and second frequency-divided waves, frequency dividing means for dividing the phase difference between the frequency-divided waves by the period of the omega signals to produce an integral quotient which constitutes a lane number while the remainder represents the phase difference between the first and second omega signals.

Position detecting device for omega receiving system

Growing community of inventors

Nishinomiya, Japan

Asao Kitabatake