Abstract: The molded resonator includes at least one formed resonator element having an resonator portion and opposed end leg portions which provide electrical connections to the main portion. A dielectric portion is molded about the resonator element. A conductive ground plane is carried by the dielectric portion and electrically shields the resonator element. The resonator element is formed of wire having a circular cross-section.

Abstract: In system capable of self turn-off, a circuit arrangement for providing a controlled turn-off includes a detecting circuit for detecting actuation of a turn-off switch, thereby providing a turn-off authorization signal. A turn-off protection circuit is coupled to the detecting circuit and a controller is coupled to the turn-off protect circuit and the detecting circuit. The controller disables the turn-off protect circuit when the turn-off authorization is received and present. The controller generates a turn-off signal for powering the system down after the turn-off protect circuit has been disabled.

Abstract: For proper pre-assembly alignment of the hinge plate holes (e.g., 120b and 136b), stops (e.g., 140a) are engaged in notches (e.g., 119b). A hinge pin (128) is then inserted into the aligned holes to attach the clip (130) to the base plate (102). The pin is locked in position by a spring finger (204) that forcibly engages the semicircular wall (202) of one hinge plate hole (120a) into a groove (304) on the pin. A coil spring (122) is unloaded during assembly because its free ends (124a and 124b) project through apertures (116a and 116b) in the base plate. After assembly, the spring is pre-loaded by engaging its free ends under tabs (116a and 116b) that project into the apertures. The base plate has a "U" shaped bracket (502) at one end and a tab (112) on a torsion bar (110) at the other end to attach the assembly to a radio housing.

Abstract: A method and apparatus are provided for generating a uniquely shaped prototype digital pulse which is transmitted with minimal frequency spectrum consumption and yet a relatively high bit rate. Such uniquely shaped digital pulse is stored in a memory included in a transmitter until transmission is desired, at which time a positive of the pulse is transmitted to correspond to a first logic level or the negative of the pulse is transmitted to correspond to a second logic level.

Abstract: An balun-antenna arrangement is provided which is capable of being fabricated on a printed circuit board by automated equipment. The balun-antenna includes a microstrip transmission line which is coupled to one end of a split microstrip transmission line having opposed ends. An antenna which is symmetric about its feedpoint is coupled to the remaining end of the split microstrip transmission line.

Abstract: This antenna includes a helically formed wire coil having a lower end that is positioned in a connector a solid dielectric material is injection molded into the coil and connector to precisely maintain the coil dimensions and support the coil. An outer cover is injection molded over the coil and dielectric material.

Abstract: A paging station remote control system capable of providing analog or binary modulation modes is described. Control of the paging base station is effected through a signalling scheme comprising a combination of tones and timed pauses generated in response to control signals supplied either manually or by a paging terminal. The paging system is capable of transitions between binary and analog modulation modes without first dekeying the paging transmitter.

Abstract: A speech amplifier circuit increases the maximum perceived loudness at the speaker (412) and reduces distortion at high volume levels without increasing the power consumed by the speech powder amplifier (410). When a low volume is selected by the volume control (414), the microcomputer (418) sets the step attenuator (406) at a correspondingly high attenuation level and the high-pass filter (408) is bypassed. As the volume control (414) is advanced and the speech power amplifier (410) is 12 dB into clipping, the microcomputer (418) activates the high-pass filter (408) and simultaneously steps the gain of the step attenuator (406) by 6 dB.

Abstract: An expandable chassis includes a four sided frame with a central opening to receive a plate or "shield" which is allowed to move within the frame between two predetermined positions. Protuberances on the shield contact the frame and limit its inward movement while outward movement is limited by a spring clip on the shield that snaps into an aperture in the frame. Tabs on the frame support integrally formed spring fingers on the shield which tend to force the shield outward. A membrane switch contact assembly and a speaker are respectively attached to the inside and outside surfaces of the shield. By compressing the shield partially into the frame, the chassis assembly slides into a molded plastic housing. A rubber key actuator pad on the outside of the housing has a plurality of keys each having a protrusion or "actuator" that extends partially into an actuator hole in the housing. When the key is depressed, the actuator depresses and activates one of the switches in the membrane switch contact assembly.

Abstract: A controller module includes a cast module base having a central recess with a peripheral ledge. A cover plate is positioned in the recess and supported by the ledge. A flexible circuit is attached to the inside surface of the cover plate and includes two integral flexible circuit connectors. One connector protrudes through an opening in the side of the module base while the second connector wraps around an edge of the cover plate and is adhesively bonded to the outside surface of the cover plate. The flexible circuit includes a polyimide substrate with electrical circuit patterns disposed on opposite sides of the substrate. A polyimide cover layer is adhesively bonded over one electrical circuit pattern and the cover layer is then adhesively bonded to the inside surface of the cover plate. A solder resist layer is applied over portions of the other electrical circuit pattern leaving exposed areas for soldering and electrical contact.

Abstract: An improved synchronization system for use with simulcast transmission systems is described. The invention provides a method and means for keeping the information signals for adjacent transmitters in the system in synchronization. This invention utilizes a centrally located master transmitter and control unit and a plurality of secondary transmitters disposed in an annular fashion around the master transmitter. In operation, the innermost annular band is synchronized to the master transmitter, while the remainder of the system is disabled. The next adjacent annular band is then synchronized to the innermost annular ring. The process is repeated until every annular band in the system is synchronized.

Abstract: An electrically variable three terminal monomorphic piezoelectric capacitor is manufactured with thick or thin film hybrid microelectronic circuit technology. A first capacitor plate and a ridge, which substantially surrounds and extends above the first capacitor plate, are formed on the surface of a substrate. A monomorphic piezoelectric wafer having a control plate and a second capacitor plate on opposing surfaces is bonded to the upper surface of the ridge. During bonding, a force is applied at the center of the wafer which fixes a permanent bow in the wafer in the direction of the first capacitor plate. A four terminal monomorphic embodiment and three and four terminal bimorphic embodiments are also described.

Abstract: A clear plastic lens contains a fluorescent dye. The lens is substantially parallelepiped in shape with two major opposed parallel surfaces and four sides. Three of the sides are reflecting sides. Each reflecting side has two flat transparent surfaces positioned at angles of 135 degrees relative to the opposed parallel surfaces. The fourth side is a transmitting side that has one flat transparent surface perpendicular to the opposed parallel surfaces. Light enters the lens through an opposed parallel surface, is absorbed by the fluorescent dye, and is emitted a short time later. The emitted light is reflected at the reflecting sides and opposed surfaces, and redirected towards the transmitting side where it passes into the environment as a collimated beam.In another embodiment, the transmitting side is at an oblique angle relative to the opposed parallel surfaces and has a plurality of small steps. Each step has two surfaces, one perpendicular and one parallel to the opposed parallel surfaces.

Abstract: An electrical connector is provided for making electrical connection to a mating connector. The connector includes a body portion that has a substantially cylindrical cavity. A contact block is located in the cavity and carries three contacts. A spring engages the contact block for applying biasing force to the contact block and contacts for providing electrical connection of the contacts to the mating connector. A peripheral resilient seal is located above the contact block and provides a seal between the contact block and a cylindrical cavity. The peripheral seal includes a bead portion that engages the mating connector for providing a water seal about the contacts.

Abstract: A tone generator for producing a plurality of output tone waveforms for a plurality of frequencies, includes an encoder for selectively generating a first waveform that has a first number of states and second waveform that has a second number of states which are less than the first number of states. A control circuit is connected to the encoder and selects the second waveform for higher frequency output tones and the first waveform for lower frequency output tones. The control circuit provides a control clock signal to the encoder for determining the frequency of the output tones. A low pass filter is connected to the encoder for filtering the output tones. The encoder includes a plurality of flip flips having outputs connected to a summer by gates that are actuated by the control circuit.

Abstract: A variable capacitance circuit includes a varactor having an anode side and a cathode side. A first variable bias voltage is applied to one of the sides and one of a plurality of voltages is applied as a second bias voltage to the other side for controlling the capacitance of the varactor. A voltage multiplier circuit connected to a voltage divider network is used for supplying the plurality of voltages. A decoder is responsive to input signals for selecting and applying one of the multiple voltage outputs. The variable capacitance circuit is used in a voltage controlled oscillator of a frequency synthesizer for providing extended frequency range.

Abstract: A trimmable circuit includes a first transistor for generating an output current and a plurality of programmable trimming networks connected to the first transistor for regulating the output current of the first transistor. The plurality of programmable trimming networks include a network for decreasing the output current of the first transistor by introducing a second transistor into the trimmable circuit to draw current away from the first transistor and a network for increasing the output current of the first transistor. The trimmable circuit further includes a voltage-divider circuit connected to the plurality of programmable trimming networks, for limiting the voltage across any trimming network during programming.

Abstract: A system for assembling a hard crystal blank onto a base which includes connecting pins, using an apparatus providing self-locating and self-fixturing features, is described. The apparatus comprises a hard crystal blank supporting structure which provides vertical, horizontal and transverse locating features. The vertical, horizontal and transverse locating features are contiguous to the crystal supporting structure and locate the hard crystal blank to the crystal supporting structure. The hard crystal blank once located may be secured to the crystal supporting structure with a suitable adhesive. Connecting features for securing the crystal supporting structure to the base are provided. Once the crystal supporting structure has been secured to the base, the vertical, horizontal and transverse locating features are separated from the crystal supporting structure. The hard crystal blank and crystal supporting structure so assembled are precisely aligned to the base.