Processing circuit for signals from directional VHF aerial - has tuned circuits coupled via band pass filters to couplers in bus

摘要

The processing circuit, for signals from a directional VHF aerial, has a low noise broadband amplifier coupled to the aerial at its input and to a bus at its output. The bus contains couplers and is terminated in a reflection-less termination. The outputs of the couplers are decoupled from the bus. Each coupler output is connected to a barrowband bandpass filter consisting of the series combination of three resonant circuits tuned to the wanted receive frequency. The outputs of the resonant circuits are connected to the inputs of a distributor to combine the individual different receive frequencies.