Channel selecting control system for television tuner including unused channel skip system

In a receiver having an electrically controlled tuner, a sequential tuning system comprising:

• a plurality of actuable stages corresponding to a plurality of frequencies only some of which are to be selected, each stage having an adjustable resistor which can be varied to change the level of a tuning signal coupled when the stage is actuated to the tuner to control the frequency thereof;
• each adjustable resistor being adjustable to generate a predetermined level of tuning signal when the associated stage is to be effectively skipped during a scanning sequence;
• sequence means for sequentially actuating at a slow rate each of the plurality of stages to sequentially generate tuning signals from the adjustable resistor in order to step the tuner sequentially through the entire plurality of frequencies;
• switch means responsive to generation of tuning signals having the predetermined level for causing the sequence means to step at a fast rate to actuate the next stage to thereby effectively skip stages which are not to be selected during the scanning sequence;
• frequency stopping means actuable for stopping the sequence means when the tuner has been stepped to any desired frequency in order to maintain the receiver tuned to the desired frequency;
• and
• cycle stopping means for stopping the sequence means after the entire plurality of frequencies has been scanned once without actuation of the stopping means in order to return the tuner to the frequency to which the tuner was tuned when automatic scanning was initiated by actuation of the sequence means.