Abstract: A transistor amplifier circuit operating in matrix interconnection for selectively amplifying signals received on a magnetic recording media by a low impedance head is disclosed which uses a common base preamplifier circuit for signal selection with a common collector amplifier and a common emitter feed-back network.

Abstract: The present invention consists of improved drive circuitry for a plasma display panel using low voltage switching devices to control charge storage diodes which in turn regulate high voltage currents. These circuits are implemented as clamp bus selection means coupled with high voltage selection pulse circuit means. Further improvements comprise means for grounding unselected clamp buses. In combination with a plasma display panel, other, prior art, drive circuits, the clamp bus selection means and the high voltage selection pulse circuit means, the invention includes special sustain drive circuits.

Abstract: Two or more processors share a large main memory in which are stored the programs and data sets on which the processors operate. Each processor operates independently from every other one, and selects its tasks for operation on the basis of information contained in tables which may be updated independently by each processor.

Abstract: A circuit card guide adapted to be fastened in a temporary fashion between permanently attached card guides so as to permit the guiding and retaining of circuit cards having a width substantially less than the spacing between the permanent guides.

Abstract: A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger pressure can cause electrical contact between any one of the first set of strips and any one of the second set of strips. The substrate may be either flat or curved, with the membrane conforming to its contour.

Abstract: A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger pressure can cause electrical contact between any one of the first set of strips and any one of the second set of strips. The substrate may be either flat or curved, with the membrane conforming to its contour. A vent in the membrane allows the membrane to assume its natural shape more quickly by allowing air to flow between the substrate and the membrane.

Abstract: A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger pressure can cause electrical contact between any one of the first set of strips and any one of the second set of strips. The substrate may be either flat or curved, with the membrane conforming to its contour.

Abstract: A location sensitive touch panel for use on a rigid substrate. The substrate carries a first set of conductive strips. A resilient plastic membrane overlaying it carries a second set of conductive strips orthogonal to and spaced from the first set. Finger pressure can cause electrical contact between any one of the first set of strips and any one of the second set of strips. The substrate may be either flat or curved, with the membrane conforming to its contour.A piezoresistant coating is interposed between the sets of conductive strips and may be disposed on either or both sets if strips.

Abstract: An improved disc memory module design in which mechanical force to shift the data transducers and to rotate the discs is supplied through magnetic couplings to the module, thereby avoiding radial stresses created by mechanical couplings such as belts, splined connection shafts, gears, etc. The use of bearings at each end of the spindle and the head arm shaft also reduces the errors induced by radial stresses on the axis of the head arm shaft and spindle.

Abstract: A frequency modulation oscillator circuit is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous frequency modulated signal with no discontinuities. For each desired output frequency, there is an input amplifier, responsive to an input binary signal, the output of that amplifier being summed with the outputs of the other amplifiers. For each input amplifier there is an active feedback network containing a delay element which will produce oscillation in the associated amplifier, the active feedback network from each amplifier being isolated from the other amplifiers and feedback networks. Input amplifiers comprising differential amplifiers emitter coupled to transistor switches are shown together with common base feedback amplifiers emitter coupled to the collectors of one of the transistors comprising the input differential amplifier.

Abstract: A frequency modulation oscillator is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous frequency modulated signal with no discontinuities. For each desired output frequency, there is an input amplifier, responsive to an input binary signal, the output of that amplifier being summed with the outputs of the other amplifiers. For each input amplifier there is an active feedback network containing a delay element which will produce oscillation in the associated amplifier, the active feedback network from each amplifier being isolated from the other amplifiers and feedback networks.

Abstract: A method and apparatus for removing the effects of radar platform movement and for otherwise processing doppler radar signals in a moving target indicator doppler radar in which targets in the main beam having reflective characteristics sufficient to override side lobe attenuation are tracked relative to the side lobes and the residual doppler frequency for such targets resulting from side lobe detection calculated. Based on this calculation, the appropriate ones of a bank of doppler filters are inhibited at the appropriate range bin to prevent a false target indication without inhibiting the display of moving targets in the main beam at the same range but having different doppler frequencies.

Abstract: A linear motor having a permanent magnet armature whose interaction with the field provided internally by a closed flux path field core having a winding on one leg, provides the driving force.

Abstract: A circuit receiving a degraded synchronous pulse signal which has missing pulses and phase-shifted pulses, and producing an output signal similar to and at a constant phase angle with the input signal, in which the missing pulses have been replaced and the phase-shifted pulses shifted to the correct relative position. Provision is made for adjusting output signal frequency to long term drift in input signal frequency.

Abstract: A TV monitor includes an antenna coupler capable of selectively coupling the TV receiver being monitored to an antenna or an r.f. oscillator. The oscillator is selectively operated to impose an r.f. signal onto the antenna input of the receiver between successive horizontal blanking periods on an active video line. One probe, connected to the horizontal retrace circuit of the receiver monitors the receiver for an "on " or "off" condition, while another probe, connected to the kinescope circuits of the receiver detects the channel to which the receiver is tuned. By successively stepping the r.f. oscillator through successive frequencies within the bandwidth of individual channels, and by monitoring the kinescope probe for that frequency which compares to that generated, channel identification may be determined.

Abstract: An airborne early warning moving target indicator radar in which targets in the main beam having reflective characteristics sufficient to override side lobe attenuation are tracked relative to the side lobes and the residual doppler frequency for such targets resulting from side lobe detection calculated. Based on this calculation, the appropriate ones of a bank of doppler filters are inhibited at the appropriate range bin to prevent a false target indication without inhibiting the display of moving targets in the main beam at the same range but having different doppler frequencies. In addition to side lobe blanking, an automatic gain control circuit is provided in which the interpulse period is divided into a large number of equal time intervals on the order of 0.4 microseconds each to thereby separate the return signal from each radar pulse into a large number of range bins.

Abstract: A printed circuit card guide having a surface adapted to closely mate with a corresponding surface on the printed circuit card and restrict the card to a precise path during a portion of its travel prior to reaching its mating position. This assures that the pins and sockets correctly engage.

Abstract: A TV monitor includes an antenna coupler capable of selectively coupling the TV receiver being monitored to an antenna or an r.f. oscillator. The oscillator is selectively operated to impose an r.f. signal onto the antenna input of the receiver between successive horizontal blanking periods on an active video line. One probe, connected to the horizontal retrace circuit of the receiver monitors the receiver for an "on" or "off" condition. A second probe, connected to the kinescope circuits of the receiver, detects the channel to which the receiver is tuned. A third probe, connected to the vertical retrace circuitry, detects the vertical retrace signal to determine when the r.f. signal is to be imposed onto the receiver's antenna input. By successively stepping the r.f. oscillator through successive frequencies within the bandwidth of individual channels, and by monitoring the kinescope probe for that frequency which compares to that generated, channel identification may be determined.

Abstract: A monitoring system for monitoring individual modules includes a central station and a plurality of remote modules connected to said central station by a data channel. Each remote module includes a switch responsive to a fault condition for connecting a passive circuit to said data channel. The central station supplies a monitor signal to which the passive circuit is responsive to supply a fault signal. The central station includes a monitor responsive to the fault signal for impressing an interrogation signal onto the data channel to which the passive circuit is responsive to supply a coded signal indicative of the particular module responding to the fault condition.

Abstract: A circuit board is provided with a plurality of groups of connectors, so disposed and arranged in respect to each other that each group is capable of receiving a chip carrier. A fluid conduit, carrying a coolant, extends through each group so that when the contacts of a chip carrier are assembled to a group of connectors, a circuit chip, having a heat dissipating bar, is in close contact with the conduit. Conductors on each chip make electrical contact to the contacts on the chip carrier. A clip fastener is fastened to the carrier and includes bias means to bias the chip so that electrical connection is established between the chip contacts and the carrier contacts and thermal connection is established between the heat dissipating bar and the conduit.