Example of a Bi-Directional Mixer


The following block diagram shows an example of a bidirectional passive mixer with RF selectivity and a terminating diplexer which should itself be terminated in 50ohms. The mixer may be a commercial type like the SBL-1, a home made equivalent using discrete diodes and transformers or a high performance type like the H-Mode mixer using FET switches instead of diodes. See elsewhere on this site for more details.

It is suitable for both reception and transmission and may be used as a building block for more complex applications.


BPF - Band Pass Filter

DBM - Double Balanced Mixer