DPRE4-6VL duplexer

摘要

A duplexer is a device that allows a transmitter and a receiver to simultaneously connect to a common antenna and operate without mutual interference or damage. There are two basic types of duplexer; the band pass and the band reject. The band reject type is better suited to close-spaced transmit and receive frequencies, such as those used within the amateur 144-146MHz amateur band. Within this band, speech repeaters use a transmitter to receiver separation of just 600kHz. This duplexer is described as being of the bandpass/reject type but seems to bernbased on band-reject (notch) cavities with matching cable sections between the individual cavities. The configuration of the duplexer is shown in Figure 1.