Abstract
A digital microwave OB link system has been developed for use in program production, such as in broadcasting and in news material transmission. The system employs multi-level digital FM modulation, which allows conventional analog equipment to be used as the digital link by adding a digital interface unit. It provides spectrum compatibility, i.e., transmission bandwidth, adjacent channel protection ratios, etc., with conventional analog systems. Therefore, it can serve in the analog-digital mixed environment during the analog-to-digital transition period. An eight-level system was developed and examined in laboratory and field tests. The results showed that the system can transmit a bit rate of 45 Mbps over a conventional microwave channel of 17 MHz bandwidth.
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