High-vision FPU using millimeter-waves

38-GHz-band HDTV FPU

Fig.1 38-GHz-band HDTV FPU

42-GHz-band high-vision wireless camera

Fig.2 42-GHz-band high-vision wireless camera

Aiming at broadcasting of high-vision TV (HDTV) programs, research and development on a wireless-relay transmission equipment, called a field pickup unit (FPU), using millimeter-waves was started in 1980.

In that year, NHK Science & Technical Research Laboratories played a major role in producing the first FPU capable of broadcasting HDTV signals by using the 38-GHz band in the millimeter wave frequency range. However, in line with changes in the frequency allocation policy of the Ministry of Posts and Telecommunications, this frequency allocation for FPUs was transferred to the 42-GHz band. In 1985, an experimental radio station license was acquired, and propagation tests were performed. As an outcome of these comparative investigations on various transmission methods, the time-compressed integration (TCI) transmission method was applied, and a 42-GHz-band HDTV analog FPU using this method was later put into practice.

In 1989, NHK Science & Technical Research Laboratories started research and development on a HDTV wireless camera using the 42-GHz band for broadcasting sports events. The HDTV component signals of Y, PB and PR are frequency modulated, respectively, and multiplexed utilizing frequency-division and circular-polarization techniques. As a result, wireless camera with bandwidth of 80-MHz was realized. This camera has made successful HDTV broadcasts from outdoor locations such as the “Super Bowl” game of the North American Football League (NFL).

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(Radio and Optical Fiber Transmission)

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