HF bridge branching circuit - has input and output directional couplers, and two additional couplers between input coupler and filters

摘要

The circuit combines without reaction two HF oscillations in different frequency bands. It has a 3db input directional coupler bridge and a 3db output directional coupler bridge. They are connected by coaxial cables of suitable electrical length in which a filter is inserted. The input bridge receives the input signal in one frequency band, and the output bridge the input signal of the other frequency band. The output bridge is connected to a common aerial. A further directional coupler is inserted in the cables between the input bridge and the filter. The conductors connected to them are preceded or followed by a rectifier and a terminating resistor.