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A marine gear is a reversible reduction gear provided in an inboard engine typically used as a propulsion unit for fishing boats. One of its functions is to provide “trolling speed” to make the boat go very slow. Some devices to attain the trolling speed is already available, in which hydraulic oil pressure for clutch coupling is mechanically controlled to achieve the boat's slow speed. However, conventional device is not satisfactory in view of performance and operational handiness. The new control system reported here resolves such problem by utilizing a solenoid to achieve optimal control over the hydraulic oil pressure. It assures easy handling, and provides the most desirable performance for a fishing boat to go dead slow. The system has an additional function to deal with another concern about a marine gear, that is, the rattling noise of the driving gear which often occurs while the engine is running in the low speed range.

A new mobile DBS TV receiving system has been developed which uses only one antenna (not divided) and tracks the satellite using steptracking. Through miniaturizing the antenna to the utmost, the total size of this system without a radome has been reduced to 200mm in height, 300mm in diameter and weighs only 5kg. The decrease in C/N (Carrier to Noise ratio) caused by the tracking error in the azimuth plane is within about 0.4dB.