Abstract: In a front wheel drive vehicle, a rear suspension system is provided for non-driven non-steered rear wheels. A twist beam axle extends along a transverse horizontal line between the rear wheels, and a pair of coil springs extend along respective spaced parallel axes intersecting the noted transverse horizontal line. A stabilizer torsion bar extends along the transverse horizontal line of the twist beam axle. Each spring seat assembly is attached between its respective wheel spindle mounting plate and the twist beam axle such that the wheel spindle mounting plate is spaced outwardly of the twist beam axle. The stabilizer torsion bar extends between the spring seat assemblies and is attached to each at a point spaced inwardly of the respective wheel spindle mounting plate and inboard of the respective coil spring. Upper and lower mating shell structure is provided for the spring seat assemblies, including an upper surface with an opening therein through which the respective coil spring extends.

Abstract: A vehicle frame (200) has a rear portion with a rear siderail (204) of hat-shape cross-section, and a front portion with a front siderail (202) of C-shape cross-section received within the hat-shaped rear side-rail. The siderails are attached to each other at a joint (206) and have respective vertical sections (208) and (210) in overlapped contact with each other at the joint and providing a first mounting pad (230) of increased stock thickness. A cross member (226) is attached to the siderails at the joint and has a vertical flange (228) in overlapped contact with a respective vertical section (214) of the rear siderail to provide a second mounting pad (232) of increased stock thickness. A spring hanger (218) is mounted to and extends horizontally between the mounting pads.

Abstract: A switched reluctance motor (10) provides position and speed detection without a shaft position sensor. At least one of the stator pole faces (54) and/or at least one of the rotor pole faces (60) has an irregularity such as a notch (52 and/or 58) providing a perturbation or blip (70, 82) in the inductance profile (72, 76, 84) of the motor (10) during rotation of the rotor (14) indicative of the position of the rotor (14) relative to the stator (12). The frequency of the perturbations indicates motor speed.

Abstract: In a hot water heater (10), a bottom base pad (34) of relatively rigid insulating material has an outer tapered side (38) allowing clearance of the bottom edge (30) of the outer jacket (14) past the top (40) of the peripheral annular portion (36) of the base pad (34) without snagging, to facilitate assembly, and providing decreasing clearance between the tapered side (38) and the jacket (14) as the jacket is slid downwardly.

Abstract: A simple technique and circuit is disclosed to replace prior Z-.theta. type discriminators in supplying the loading and phasing control signals to the impedance matching network in an automatic antenna tuner. The new circuit samples forward and reflected voltage V.sub.f and V.sub.r (or equivalently I.sub.f and I.sub.r) in the RF input. The loading control signal is supplied according to the in-phase component of V.sub.r relative to V.sub.f. The phasing control signal is supplied according to the quadrature component of V.sub.r relative to V.sub.f. The magnitude of each of the in-phase and quadrature V.sub.r components is reduced to zero by the matching network to thus reduce the phasor amplitude of V.sub.r to zero and hence eliminate reflected voltage.

Abstract: A direct measurement technique is disclosed for determining baseband frequency response of an FM transmitter without using response-altering test devices otherwise injecting frequency dependent characteristics, such as pre-emphasis networks and demodulators. The technique enables absolute, universal standardization. Variations in a sideband amplitude in the output spectrum from the FM transmitter unit under test are monitored while changing the frequency and controlling the amplitude of the modulating signal so as to maintain a constant modulation index B. A signal generator supplies the modulating signal directly to the FM transmitter without frequency dependent pre-emphasis. A spectrum analyzer directly examines the output spectrum of the FM transmitter without demodulation.

Abstract: A quality monitoring technique and detector is provided for checking the accuracy of modulation performed by a digital transmitter. The monitoring is performed without using a full receiver nor otherwise fully demodulating the signal to recover the baseband data. The modulated signal output by the transmitter is partially demodulated to a partial signal set on a single dimension of a two dimensional modulated signal matrix. The baseband signal is translated in accordance with a predetermined mapping format into the partial signal set on the single dimension for correlation against the partially demodulated signal. Failure to correlate indicates an error.

Abstract: A simple system is disclosed for detecting an 8 PSK (Phase Shift Keyed) - PRS (Partial Response System) signal output set, and other multi-level PSK and APSK (Amplitude and Phase Shift Keyed) - PRS signal sets. Quadrature interdependent channel decision feedback translates a reduced output signal set which is a scaled down version of the original full response input signal set before partial response filtering. The reduced output signal set has the same number of points and the same distribution array pattern as the input signal set. This enables the use of a conventional detector which need only detect the reduced signal set, not the complete output signal set. A decoder controls selection of predetermined interdependent signal value adjustments for each channel to translate the reduced output signal set in accordance with each successive signal relative to the then current signal value.

Abstract: A locking handle is provided for mounting a circuit card module to a card cage or rack. The module is released from the cage by pulling the handle to flex and bow the latter to a release position disengaging the cage to allow removal of the module. Upon re-insertion, the handle is pushed flat against the front edge of the module by the operator such that the operator need not push against the raw circuit card module edge. After insertion, the handle is translated downwardly to a locking position engaging the cage to prevent removal of the module.

Abstract: A drop and insert channel bank is provided for receiving data from and inserting data onto a multichannel digital transmission line, such as a microwave radio link, between end terminals. The channel bank has a plurality of single channel units which share common equipment, including a receiver and a transmitter from and to the transmission line and a switching unit therebetween. The switching unit includes user controlled selection circuitry enabling any channel on the line to be dropped to any of the channel units, and enabling any channel to be inserted on the line from any of the channel units. Through-traffic passes through the receiver, switching unit and transmitter of the channel bank in digital form without conversion to and from analog form. Unidirectional and bidirectional modes are disclosed, including various forms of each.

Abstract: An extraction tool is provided for removing a locking latch from a snap-in socket of an electrical connector housing. The tool has a fork-like portion insertable into the socket for spreading the latter, and has an extendable hook portion for engaging and removing the latch from the connector housing upon spreading of the socket.

Abstract: A synchronization system for data coupling apparatus is provided by delaying clocked frame identification signals instead of delaying the data in data buffer storage. Data is passed between input and output transmission lines with only the inherent delay incurred in the requisite data manipulation therebetween. The framing alignment information extracted at the input is connected to the output through a delay such that the data and framing identification signals arrive at the output at the same time and in synchronous alignment. In addition to eliminating the need for a data buffer, the system also eliminates the need for a second identification bit alignment location derivation from the output. The system utilizes an edge-aligned clock which enables substitutional insertion of data to a desired location in the bit stream.

Abstract: A muldem (100) has a monitor (101) which automatically sequentially tests data paths through the muldem for detection of malfunctions in the muldem. Standby data path protective switching means (108, 109) provides alternate data paths through the muldem in the event of a malfunction. The monitor may be manually overridden and locked to a specified data path for continued analysis of such path. Additionally, a selected path may be manually locked out from switching to standby. The monitor automatically checks before switching any data path to standby, to prevent a selected path from being switched, while permitting automatic protective switching of the other data paths.

Abstract: A collinear dual dipole antenna is split into two sections which are connected by a central conductor extending in spaced parallel relation within hollow support mast sections, and forming an effective transmission line providing RF continuity at a high band frequency f, and discontinuity at a low band frequency 1/2 f. The configuration provides a dual band antenna operating in either band from a single source without filtering and without modification of the antenna. In the high frequency band, the antenna operates as a dual dipole array. In the low frequency band, the antenna operates as a single dipole array with each mast section and its respective dipole acting as half of the single dipole array.

Abstract: A corrugated feed horn and its method of manufacture is disclosed for circularly polarized SHF (super high frequency) and EHF (extra high frequency) parabolic antennas operating in the 12-100 GHz range. A plurality of laminations are dip braze bonded, providing alternate fins and grooves in an inner conical configuration. Extremely thin fins are enabled without expensive parts or fabrication methods.

Abstract: A mechanical bandpass filter of the cascaded flexure mode resonator bar type is provided with a coupling structure improving strength an reducing rigid-body spurious modes. Coupling wires are provided on both the top and bottom surfaces of the resonator bars, not just in a single plane.

Abstract: Fast response detection of repeatedly transmitted redundant digital codewords is provided by checking the same bit-position in consecutive n bit codewords. The number m of codewords checked is increased until the number of equal bit values reaches a varying threshold j.sub.m dependent upon m, or until m reaches a maximum M. This sequence is repeated for each of the remaining bit-positions of the codeword. Faster response is provided when an early threshold is reached, eliminating the need to continue checking the same bit-position in the remainder of the M codewords.

Abstract: Detection of repeatedly transmitted redundant digital codewords is provided by checking corresponding bi-positions for consecutive n bit codewords, counting the number of ones and zeros for each bit-position. When there is at least a preselected threshold J.sub.M of equal bit values for each of the n bit-positions of the codewords, in M or less consecutive codewords, the detection process is complete.

Abstract: Microwave circuit layout structure is disclosed for a diode mixer frequency converter. Each mixer port is provided by balun circuitry, and the diodes are isolated from, and on the opposite side of the substrate from, the primary circuits of the baluns. Single and double sideband versions are disclosed, including various combinations of dual and single baluns and porting structure.

Abstract: Microwave circuit layout structure is disclosed for a diode mixer frequency converter. The circuit layout structure is compact and symmetric, and enables coplanar diode lead connection.