Abstract: An experimental 8mm-wave multi-functional transmission system has been set up for the transmission of color TV, telephony, and data in a bi-directional manner. In this paper, the design and performance of this system is presented with regard to detailed system considerations and description. A series of measurements and experiments have been carried out to measure the practical transmission performance, and to observe the transmission quality. At a given bit error rate, the deterioration of signal-to-noise ratio in a nonlinear band-limited channel have been predicted with a MSK modulation. The link availability of this system at different data rates are given in reference to the rainfall distribution of Hong Kong. The experimental results show that the transmission range $GRT 1km for TV signal under clear-air conditions, transmit-receive isolation $GRT 50dB, low bit error rate at a serial data communication, and high quality of TV programs transmission can be observed. !6
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