MULTI-CHANNEL WAVE RECEIVER

摘要

A television signal receiving circuit having a solid state VHF and UHF tuner. The VHF tuner includes a number of resonant circuits and solid state switching means to switch between low and high bands within the VHF frequency range. The UHF tuner is coupled directly to an input of the mixer associated with the VHF tuner. The local oscillator associated with the VHF tuner has two means for injecting the oscillator voltage into the mixer. One of the injection means operates only on high frequency band and is controlled by a switching diode. The various resonant circuits of the VHF tuner utilize dumping impedances which are switched in and out of operation in order to equalize the resonant gain between low and high frequency band operation.