[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

Narrow MUSE is developed for terrestrial broadcasting of the 1125 line/60Hz Hi-Vision signal.
This system is designed for transmitting below the 6 MHz RF bandwidth to bring the Hi-Vision signal in line with the terrestrial ATV (advanced television) system adopted by the FCC of the US. System development required examination of band compression principles, and involved computer simulation and production of experimental hardware. The resulting Narrow MUSE format posseses sufficient ATV system capabilities.
This report discusses base-band processing for the Narrow MUSE system.

View full abstract

This paper describes the transistorization of a SITs*-equpped 100kW medium-wave radio transmitter.
This new transmitter was designed with regard to countermeasures against power refrected to the transmitter with the antenna base grounded, power variations in load change, breakdown of SITs in instantaneous power interruption, etc, to obtain 100kW output power with high stability.
The transmitter is composed of three 50kW transmitters : two in parallel and one stand-by. Each transmitter consists of six 10kW transmitters composed of two 5kW power amplifiers and one 10kW modulator.
The transmitter displayed an overall efficiency of 65% or more, low distortion of 0.5% or less, and a signal-to-noise ratio of 76dB.
(* Static Induction Transistor)

View full abstract

[in Japanese]

View full abstract