Abstract: An external motor is coupled to a tuning rod extending into a resonant cavity of a transmitter combiner. A microprocessor tuning control system generates motor control signals that cause the motor to rotate the tuning rod, varying the resonant frequency of the cavity so as to minimize the reflected power from the cavity. Incident and reflected power are detected by diodes in the transmitter cable connecter of the cavity. The standing wave ratio is computed and composed with a threshold value to determine if the cavity needs to be retuned. The microprocessor effectuates reading of digital numbers representing the incident and reflected power and makes a "best effort" attempt to tune the resonant frequency of the cavity to the transmitter frequency, using the motor to rotate the tuning rod.

Abstract: A duplexer includes an integral interdigital transmitter filter and parallel interdigital receiver filter in a common housing. A three-quarter wavelength antenna transformer section couples rf energy from the transmitter filter to an antenna and also couples rf energy from the antenna to the receiver filter and to an antenna cable connector.

Abstract: A transmitter combiner includes a plurality of adjacent square prism filters, each of which shares at least one square wall with another of filters. Tuning of the individual square prism filters is accomplished by adjusting the position of tuning rods located in the high electric field region of each cavity. Tuning of each filter is achieved by rotating a control rod perpendicular to and extending through a rectangular end wall to pivot the tuning rod in that filter. In one embodiment of the invention, the control rod extends through a conductive tube attached along a square wall of the filter and perpendicular to the rectangular wall. In another embodiment of the invention, the control rod extends from the center of the rectangular wall and supports the tuning element near the center of the cavity. Temperature compensation is accomplished by variation in the length of the control rod as a function of temperature to compensate for changes in the dimensions of the cavity with the temperature thereof.

Abstract: Antenna mount comprised of an essentially tubular length of an elastomer, to which, at one end, a fitting adapted to receiver an antenna is secured and, at the other, a fitting adapted to receive a lead-in connector is also secured. A flexible conductor extends between the portions in the fittings where electrical contact is made with, respectively, the antenna and a coupler for the lead-in to the radio set. Noise-free duplexing can be obtained.

Abstract: A mounting bracket for an automotive vehicle rear view mirror. The bracket includes a mirror-supporting arm which normally extends outwardly from the side of the automotive vehicle. A spring-loaded detent maintains the mirror-support arm in its normal position. Manually applying a pivoting force above a certain magnitude to the arm overcomes the biasing force of the detent and permits rotation of the mirror-support arm and its mirror inwardly towards the automotive vehicle to reduce the overall vehicle width.

Abstract: A duplexer includes an integral interdigital transmitter filter and parallel interdigital receiver filter in a common housing. A three-quarter wavelength antenna transformer section couples rf energy from the transmitter filter to an antenna and also couples rf energy from the antenna to the receiver filter and to an antenna cable connector. The receiver filter selectivity is improved by providing a notch resonator between a receiver transformer section and the housing, and the transmitter filter selectivity is improved by providing a notch resonator between a transmitter resonator and the housing.

Abstract: A three-stage amplifier circuit specially configured to provide a high input impedance. An initial emitter follower transistor stage amplifies the current level of an ac input signal to produce a first intermediate signal, a common-base transistor stage amplifies the voltage level of the first intermediate signal to produce a second intermediate signal, and a final emitter-follower transistor stage amplifies the current level of the second intermediate signal to produce an output signal in phase with the input signal. A feedback circuit feeds back the output signal to the input of the common-base transistor stage, to supplement the first intermediate signal input. This effectively increases the input impedance of the common-base transistor stage and, likewise, the initial emitter follower transistor stage, whereby the amplifier circuit can be used to amplify signals produced by high impedance sources.

Abstract: An improved method for securing an antenna to a vehicular window. Adhesive securance of a base portion of an antenna assembly is accomplished by an adhesive means including a conformable foam layer and a pressure sensitive adhesive layer. A bridge of silicone adhesive is provided to surround the adhesive means, and a shield is disposed thereabout and is adhered to the window and base to protect the adhesive means and to restrain removal of the base portion from the window.

Abstract: An isolator assembly for isolating a transmitting and receiving communications antenna member from a mast and connector. The isolator assembly electrically couples an antenna member to a connector for passage of radio frequency energy but also electrically isolates the antenna member from the connector and the mast from a high voltage on the antenna member.

Abstract: A conversion kit for an automotive wheel cover, which has a central opening defined therein, is provided by securing a hub spacer to a vehicle wheel against a bolt-on flange formed as part of the vehicle wheel. The hub spacer is secured by lug bolts or nuts. The hub spacer forms a guide which extends from the vehicle wheel toward the central opening of the wheel cover. A fastener, which is longitudinally constrained with respect to the hub spacer, is included within the guide and is laterally movable to allow the fastener to be aligned within the central opening of the wheel cover. A replacement hub cap is mounted in place of the conventional non-locking hub cap. An annular concentric recess is formed in the replacement hub cap and is disposed in a direction away from the automotive wheel. The annular recess forms a narrow bearing shoulder and a small diameter axial bore through which the fastener is disposed.

Abstract: A decorative wheel cover is devised for an automotive wheel hub which allows for the arbitrary multiplication of decorative designs displayed by the wheel covering. The wheel cover includes a rim which is coupled to the wheel and a plurality of decorative segments which couple to the rim. Each of the segments is reversible or may be displaced with respect to each other to vary the pattern formed by the segments.

Abstract: An automotive vehicle sun visor is provided with an improved glare shield in which a flat sheet of glare reducing plastic is hinged to a backing and secured to the sun visor by means of metal clips inserted in the backing. The backing has a latch adapted to receive the edge of the glare reducing sheet opposite the hinge when the glare reducing sheet is folded into face to face relationship with the backing.

Abstract: A gauge mounting device is provided for use in the instrument panel area of a vehicle and includes a pair of frames arranged to fit back to back in mating disposition. The outwardly facing surface of each frame is color, texture and style coordinated with the vehicle interior and to suit the preference of the user. The frames include congruent bezels with at least one gauge mounted against a bezel in one frame with an umbilical sensor connector extending through the corresponding bezel in the opposite frame.

Abstract: A timing circuit is provided for the headlights of an automotive vehicle to maintain the headlights in an illuminated condition for an adjustable, predetermined time after the vehicle ignition is turned off. The timing circuit is housed in an enclosed casing that includes an access port that allows insertion of a tool to effectuate timing adjustment. The casing includes a locking mechanism for immobilizing insulated electrical wires relative to the casing at locations displaced from the contact terminations of those wires.