MICROWAVE TRANSMITTER

Figure 2-10.—Basic microwave relay system. and a receiving terminal. Figure 2-10A shows you such a system. A duplex relay system (figure 2-10B) provides two-way communications by using two simplex systems, one transmitting in one direction and the other transmitting in the opposite direction. The duplex system is further refined by using a single antenna for transmitting and receiving. This is done by using different transmitting and receiving frequencies and by using a duplexer in the transmission line. The rf equipment in terminal and repeater stations are basically the same. Terminal equipment can be converted to repeater equipment and vise versa. Let’s take a look at a typical microwave transmitter and receiver. MICROWAVE TRANSMITTER A typical microwave transmitters shown in figure 2-11. In operation, the output of a telephone multiplex terminal, which consists of a frequency multiplexed AM carrier signal, is applied to the terminal transmitter. This input signal (baseband signal) also could be a television signal or any other form of signal to be transmitted. A pre-emphasis network accentuates the high frequencies, relative to the low, to improve the 2-10