WT4 Millimeter Waveguide System: Line and Repeater Equalization

The WT4 millimeter waveguide system requires equalization of the loss and delay of the line which is made up of both the waveguide itself and the diplexer (waveguide channelizing filter) arrays. 2 Furthermore, the RF and IF portions of the WT4 receiver require equalization for optimum performance. In Fig. 1, we show a simplified block diagram of a repeater hop. In the WT4 system all equalization is performed about the IF of 1371 MHz. Theoretically, a single equalizer package could be designed to equalize simultaneously the line and the repeater. However, as a maintenance philosophy 3 evolved, it became desirable to separate the line equalizer and the repeater equalizer. The repeater equalizer equalizes only the RF and IF portions of the repeater and resides in the repeater package while the line equalizer is designed to equalize only the 2077 TRANSMITTER DIPLEXERS WAVEGUIDE DIPLEXERS REPEATER Fig. 1--Repeater hop.