Abstract: A triple 3db, 90.degree. coupler four-way power divider provides four balanced power outputs by combining therewith a fourth coupler, each of whose two inputs is connected to a different one of the two unbalanced outputs of the divider, with the two outputs of the fourth coupler and the two balanced outputs of the divider providing the four-way divided output power.

Abstract: A post type electrical terminal having at one end at least one channel for receiving electrical wires. This channel follows a nonlinear path so as to impose a bend in any wire inserted therein.

Abstract: A mechanical bandpass filter employs bar resonators operated in a longitudinal mode of vibration which are aligned in parallel array along their longitudinal axes by rigidly joining them together with at least two support rods at their aligned nodal planes, the number and location of nodal planes being determined by operating the filter in a bandpass frequency range which corresponds to one of the harmonic longitudinal-mode resonant frequencies. Piezoelectric transducers affixed to the longitudinal surfaces of two resonators provide means for mechanically driving the resonator assembly from an electrical input signal and for extracting an electrical output signal.

Abstract: Phaselock circuitry including phaselock loop means having an input signal and a feedback signal. Two signals S.sub.X and S.sub.Y are provided which are synchronous respectively with the input signal and the feedback signal. A decision circuit provides a lock or no-lock indication based on the degree of concurrence between S.sub.X and S.sub.Y.

Abstract: The present circuit comprises a simple variable capacitive coupling to ground for two outputs of a two-output amplifier wherein the frequency gain is either boosted or cut in accordance with the setting of a reactive coupling device. For high frequencies this may be capacitive and for low frequencies this may be inductive.

Abstract: Noise suppression in a radio receiver is accomplished by clamping the receiver detector output for a predetermined period each time the noise content in the receiver signal exceeds some predetermined threshold value.

Abstract: A method and means for obtaining a linear rate of change signal from an input analog signal whose magnitude exhibits a logarithmic amplitude variation over at least a portion of the range of the independent variable defining said signal. The nonlinear rate of change of the input signal is obtained by differentiation, and the resulting nonlinear rate signal is multiplied by the nonlinear function of the dependent variable defining the input signal, which function is implemented in accordance with that defined from a mathematical differentiation of the expression defining the nonlinear characteristic of the input signal.

Abstract: Phase detection in a phase lock loop circuit is performed by periodically sampling the A. C. carrier communication signal applied thereto in response to a sample timing signal having a periodic frequency twice that of the carrier and a polarity check signal which is indicative of the polarity of the communication signal at a predetermined interval prior to each sample timing signal, one polarity enabling a sample to be taken and the opposite polarity inhibiting it.

Abstract: A modulating system using a surface acoustic wave device for receiving impulses and providing, as an output, shaped carrier signals for transmitting data. The preferred embodiment uses impulses of positive and negative polarities to provide minimum shift keyed modulated output signals wherein the carrier frequency is an odd one-quarter multiple of the repetition rate of the impulses.

Abstract: An automatic radio direction finding system employing an integrated antenna unit containing both sense and loop antennas in a single compact enclosure. Signal processing circuitries by means of which a low-frequency switching modulation is imposed on one of the antennas, as well as broad-band R-F preamplification and signal combining circuitry for the antenna outputs, are accomplished within the unit. The combining circuit output in the antenna unit, and the remote receiver input, have impedances matching that of a standard coaxial cable interconnect, such that the voltage dividing action effected by conventional antenna cable interconnect means is removed, permitting a small sense antenna of considerably less H.sub.e C.sub.a product to provide necessary sensitivity.

Abstract: A telephone amplifier circuit comprising a transmit amplifier and a receive amplifier provides gain in both the transmit and the receive directions. Loss is voice-switched into the receive amplifier in response to the sum of the transmit and receive speech levels to provide sidetone and gain control.

Abstract: Digital function generator apparatus providing an output Y from an input X according to ##EQU1## Included in the apparatus is a digital memory, a digital adder, a digital multiplier, and also timing control means.

Abstract: A digital hysteresis circuit which generates delayed, clock-synchronous output pulses from input pulses having a random timing relationship with the clock. Input pulses slewing generally in or out on a repetitive clock defined time base may back up from the direction they are slewing by a predetermined time interval without changing the time position of the clock-synchronous, time-delayed output pulses which they successively generate. The circuit is useful in reducing jitter in the read-out of a digital counter while the counter is operating by preventing a load command pulse occurring at counter transition time from effecting a read-out at that instant, and further effective in reducing jitter in the commanded read out from a digital counter where system uncertainty might otherwise cause shift of successive input commands from their normally predictable time positions.

Abstract: A method and apparatus for providing improved telephonic conferences is presented. A speaker is selected for each conferee from the signals of the other conferees. The peak values of the speaker signal establish a variable reference level which another conferee must first exceed in order to become the new speaker and establish a new reference level. The reference level is continuously allowed to decay so that new speakers may gain the floor when the current speaker's peak signals fall below the peak signals of another speaker. Both an analog and a digital embodiment of the invention are presented. A specific feature of the invention involves directing all signals of other conferees to all conferees and each conferee station selects the loudest signal (maximum amplitude) for that conferee.

Abstract: A backlighted display apparatus including a light source, and a display means having both transparent areas and light diffusing areas. Located therebetween is light refractive means for concentrating and controlling light illuminating the display means. Light absorptive means are appropriately disposed to provide contrast.

Abstract: A signal presence detector selective over at least a frequency range of F.sub.L to F.sub.H. The detector includes timing signal generating means, clock signal generating means, and means responsive to both of these for providing, in a predetermined manner, a time window following each timing indication. Also included is means for detecting time coincidence between certain time windows and certain timing indications.

Abstract: The method of and apparatus for changing the inductance of a high power air core coil through the process of selectively shorting out predetermined numbers of turns. The apparatus comprises a conductive belt which is positioned interior the coil whereby the problems of corona discharge from the winding contents are substantially reduced. Since the shorting conductor is a thin film of conductive material attached to a tape, the mass is very low and vibration forces applied to the unit have much less effect in producing interruptions of contact.

Abstract: Crossed dipole antenna apparatus configured so that the ends of adjacent dipoles are connected together to form a version of folded dipole antennas wherein there are slot antennas between adjacent dipole antennas. The combination slot and dipole antennas provide relatively broadband usable frequency range with acceptable radiation patterns.

Abstract: A circuit for providing AC gain control while minimizing the change in AC impedance and eliminating any effects on DC biasing of following stages.

Abstract: A method and means for employing digital means to calibrate an analog sweep waveform in a range determining system. The method imparts digital accuracy in maintaining the voltage-distance analog of the sweep waveform by generating a clock defined strobe at a time when the sweep voltage should reach a reference voltage level, comparing at strobe time the sweep voltage with a precision voltage source of reference level, and correcting the slope of the sweep voltage in accordance with any discrepancy existing at the time of comparison.