The Tuner Diode: Electronically Tuned and Switchable TV Tuners Employing Diode Types BA14l and BA142

Two new variable capacitance tuner diodes are described which are designed for use in TV VHF and UHF tuner applications plus as AFC diodes and as FM tuner diodes. A combined VHF-UHF tuner circuit is described utilizing these diodes for electronic tuning. This tuner also incorporates newly developed diode switches which provide for band switching by DC voltages at the panel of the receiver. Thus, a complete TV tuner that is tuned and switched only by DC voltages is shown to be feasible.