Vhf/uhf interlock circuit

Claim 2

The combination of: a television receiver having a first plurality of channels; an electronic control system detachably connected within said receiver for electronically switching the tuning of said receiver from one to another channel of a group of said channels; and means responsive to the physical disconnection of said control system from the remainder of said receiver for automatically tuning said receiver to a particular one of said channels.

Claim 3

The combination of claim 1, wherein said particular one of said first plurality of channels is associated with tuning said receiver to a second plurality of channels and wherein said receiver includes means for manually tuning to any of said second plurality of channels.

Claim 4

The combination as set forth in claim 2, wherein said first plurality of channels comprises a plurality of VHF channels, and said second plurality of channels comprises a plurality of UHF channels.

Claim 5

The combination of: a television receiver having a plurality of channels which are selectively tuned by means of control signals applied to a plurality of terminals, each terminal corresponding to a different channel; a plurality of drivers, each driver having an output coupled to a different one of said terminals and an input, each one of said drivers generating a control signal at its output adapted to tune the receiver to its corresponding channel in response to a signal applied at its input; an electronic control system including sequencing means having a plurality of output lines, each output line corresponding to a different channel, said sequencing means suitable for generating a pulse on successive output lines; connector means for detachably connecting each of said sequencing means output lines to a different one of said driver inputs; and means responsive to the disconnection of said connector means for applying a signal to the input of one of said drivers.

Claim 6

The combination of: a television receiver having a plurality of channels which are selectively tuned by means of control signals applied to a plurality of terminals, each terminal corresponding to a different channel; a plurality of drivers, each driver having an output coupled to a different one of said terminals and an input, each one of said drivers generating a control signal at its output adapted to tune the receiver to its corresponding channel in response to a signal applied at its input; an electronic control system including sequencing means having a plurality of output lines, each output line corresponding to a different channel, said sequencing means suitable for generating a pulse on successive output lines; connector means for detachably connecting each of said sequencing means output lines to a different one of said driver inputs; and means responsive to the disconnection of said connector means for applying a signal to the input of one of said drivers.

Claim 7

The combination as claimed in claim 4, wherein said disconnection responsive means includes a transistor coupled to the input of one of said drivers, said transistor being maintained in the ''''off'''' condition by means of a signal line coupled from the electronic control system through said connector means and said transistor being enabled and suitable for generating an enabling signal to the input of the driver to which it is coupled when the connector means are disconnected.

Claim 8

The combination as claimed in claim 5, wherein each of said drivers includes a transistor having its base coupled to one of said driver inputs and its collector coupled to one of said driver outputs.

Claim 9

The combination as claimed in claim 6, wherein said disconnection responsive means transistor has its collector to emitter path coupled to The base of one of said driver transistors and its base connected to said signal line by means of said connector means; and wherein said disconnection responsive means transistor when conducting causes said one driver transistor to conduct.

Claim 10

The combination as claimed in claim 6, wherein said electronic control system including said sequencing means are placed on a first board; wherein said plurality of drivers including said disconnection responsive means are placed on another board; wherein the two boards are interconnected by said connector means; and wherein said disconnection responsive means are activated when said first board is removed from the receiver.