Abstract: An improved tuning apparatus for a receiver of the automotive type which includes a tuning core axially slidable within a tubular coil form having an inductance coil wound therearound in which vibratory movement is minimized. The tuning core is formed with a channel at one end to receive one end of an elongated flexible member. The opposite end of the flexbile member extends away from the axis of the tuning core and abuts against the interior surface of the tubular coil form. In this manner, sliding movement between the tuning core and tubular form and wire is permitted during the tuning operation but a resistance to side-to-side (radial) movement of the core is maintained at other times to minimize the effect of mechanical vibrations thereon which give rise to undesirable microphonics on an associated receiver.

Abstract: Upon pushbutton depression, a face in the key slot of a button slide forcibly engages the T lug extending from a tuner slide, thereby translating the tuner slide. Coupled to the tuner slide is a memory cam the angular position of which is presettable, corresponding to a desired receiver tuning. The cam is forced to engagement with a tuning mechanism which senses the angular position of the cam and tunes the receiver accordingly. The face is predeterminedly curved, and the vertical height of the slot so dimensioned, to decouple vertical deflections of the button slide from the tuner slide, thus minimizing deviations of the cam from its preselected position. When mounted in a chassis, the chassis is provided with a guide detail which further minimizes vertical deflection of the tuner slide.