Showing papers on "Stub (electronics) published in 1975"

Equations for Microstrip Circuit Design

Abstract: A method for determining the accuracy of computed impedance and wavelength data for microstrip is proposed. It is shown that the standard equations of Wheeler and Schneider have rather large errors. Revised equations for microstrip impedance and wavelength are given both for analysis and synthesis with accuracy better than 1%. A simple, accurate equation for the microstrip open circuit is presented. Experimental data on microstrip T-junctions are compared with existing theories. A new accurate equation is given for the reference plane displacement in the stub arm. Corrections are proposed in the existing equations for the other parameters of the equivalent circuit.

Combined mailer and return envelope assembly

Abstract: A single web is folded twice upon itself to provide an outgoing mailer The first fold is secured in place to define a return envelope having an envelope pocket and a sealable flap The second fold is removably secured over the first fold and may be separable into two parts, one of which being a receipt stub Also, a removable return stub is formed adjacent the return envelope

Printed broadband rf bias circuits

Abstract: A printed broadband rf transmission line circuit is provided with a D.C. bias port in the form of a high impedance printed stub conductor connected between a ground point and the transmission line. Minimum attenuation of a broadband rf signal on the line is achieved by including in the transmission line a plurality of series-connected conductor segments having different line length and impedance values such that the transmission line and stub conductor configuration are tuned to provide a maximum voltage transmission coefficient across the D.C. bias port. The parameters for the series-connected transmission line segments and the stub conductor are selected by performing a computer optimization of the chain matrix equivalent expression of the voltage transmission coefficient for the series-connected transmission line segments together with the stub conductor.

Multi-cylinder printing press and cylinder bow compensation system

Abstract: To prevent center sag, or bowing of printing cylinders, and thus uneven printing throughout the axial length thereof, extension struts are connected to stub shafts at the ends of the cylinders, the struts being connected together to form a closed, rectangular or square frame in which the individual lengths of the struts are adjustable to thereby provide individually adjusted forces to the ends of the stub shafts and counteract sag or bow of the cylinders.

Cylindrical brush with stub shaft support

Abstract: A separable stub shaft connection for a rotatable surface treating member, such as a brush, having a tubular hub. The connection includes a stub shaft having a preselected length thereof projecting into one end of the hub. A pair of diametrically opposed but axially spaced bearing areas create a secure engagement between the hub and stub shaft when bolted together. Appropriate clearances are provided to permit the shaft and hub to be angularly tilted through at least a limited extent relative to one another so that the stub shaft and hub can be relatively axially displaced when the hub is to be mounted on or removed from the stub shaft. The other end of the hub is mounted on a further stub shaft connection which permits the other end of the hub to be moved transversely relative to the stub shaft. For this purpose, the other end of the hub has a separable arcuate sector which extends through an angle of approximately 180°.

Constant velocity universal joint

Abstract: A constant velocity universal joint for coupling two shafts and for transmitting rotation between the shafts and enabling, independently, transmission of axial thrust between the shafts and/or slight angular displacements of the shafts relative to their axially aligned position. The constant velocity joint comprises two stub shafts adapted to be fixed to the shafts. One of the stub shafts having a cup-shaped end portion with an inwardly extending flange at its open end for mounting a socket member of a ball and socket joint whose toroidal ball member is mounted near the end of the other stub shaft. A first cylindrical sleeve is joined to the cup-shaped end portion of the flange and has an internally toothed gear at its free end meshing with radial clearance with an externally toothed gear at one end of a second cylindrical sleeve coaxial of the first cylindrical sleeve. An internally toothed gear at the other end of the second sleeve meshes with radial clearance with an externally toothed gear on the other stub shaft. The joint is of constant velocity operation.

Low loss, broadband switchable microwave step attenuator

Abstract: A printed rf circuit switchable step attenuator for frequencies in the Gigahertz range employs PIN diodes for switching a pi network in and out of a transmission line. The A.C. grounded terminations of the pi network are constructed through the use of low impedance, open end stubs, eliminating the need for plated over-edge ground connections. D.C. bias potential for controlling the switching diodes is coupled to the rf portion of the circuit by means including high impedance grounded stub conductors connected to the transmission line. To achieve broadband operation the admittance of the stub conductors is tuned out by configuring the transmission line as a series of differing line length and impedance sections which are arranged symmetrically with respect to the point of intersection between the grounded stub conductors and the line.

Rotary indicating instrument with magnetic reset

Abstract: A rotary hand indicating instrument including a maximum hand and having a solid crystal formed with stub shafts projecting axially from its front and rear faces, upon which shafts the maximum hand and associated magnetic resetting control elements are mounted.

Vibration damping means for the roll-over protection canopy of a heavy vehicle

Abstract: A B S T R A C T Vibration damping means for a mounting post of a roll-over protection canopy of a heavy vehicle such as a tractor, earth mover, or the like. A hollow square post has slightly concave walls and slides over an upright square mounting stub on the vehicle, to which it is secured by a bolt which impales the post and the stub. A reduced upper end portion of the stub receives a vibration damping member which is in the form of a hollow square. The member has rounded corners which fit snugly in the corners of the post, and the span across opposite faces of the member is less than the internal width of the post so as not to bind in the post.

Assembly stand for assembling crank shafts

Abstract: Crankshafts for motorcycles and certain other engines or assemblies of one or more gears, bearings to mount in the crankcase, bearings for rods, fly wheel cheeks, bearing seals and the like which interfit by means of stub shafts in one element fitting into holes in another element and some of the stub shafts are eccentric relative to the others. For repair, it is necessary to separate the elements and for such purpose a stand is provided having a base to fit on a press bed, a column of appropriate height for the length of the shaft handled and a shelf at the top of the column formed with a slot. The uppermost element is placed above the shelf and the others hang below. The press ram forces the projecting staff stub down while the uppermost element is held stationary, causing separation thereof from the remaining elements and this procedure is repeated until all elements are disassembled. For reassembly, a second stand is provided having an apertured base and three radially adjustable column elements. The shaft is assembled by placing the base on a press bed, inserting the stub of the lowermost shaft element on the top of the base with its stub extending through the aperture and the next element on top of the lowermost. The press ram forces these two elements into engagement and the procedure repeated until the entire shaft is assembled. The column elements are intially adjusted to provide lateral support to hold the shaft elements aligned and keep the fly wheel cheeks level.

In-Line Signal Circuit for Broad-Band Parametric Amplifiers

Abstract: A new double-tuned parametric amplifier signal-circuit configuration and a method for its experimental optimization is described. A new in-line signal circuit, which is adapted from a quarter-wave-coupled bandpass filter, is intended for use at higher microwave and millimeter-wave parametric amplifiers (paramps). It is shown that, using this signal circuit, a broader flat-gain response can be obtained as compared with the conventional double-tuned signal circuit with broad-banding stub placed multihalf-wavelength apart from the diode. To suppress the spurious response, a semilumped approximation is applied in the design. Finally, a "cold and hot" test method to optimize the double-tuned signal circuit is introduced.

High frequency planar network with non-radiating circuit elements

Abstract: A time-limited strip transmission line network includes non-radiating open-circuited stub filter network elements in a configuration adaptable for employment in a timing standard signal generator for producing sub-nanosecond duration output impulse signals.

Stripline Filters with Lumped Capacitances

Abstract: In the lecture, the arrangement and design procedure of stripline filter is out lined. The filter having lumped capacitive II-sections as coupling elements and other parallel lumped capacitances connected to each other by very short transmission line sections. This construction can be applied for a filter with narrow relative bandwidth / e.g. maximum 25-percent/.

Supply air register for false ceilings - has flat plate with openings and adjustable dampers behind it

Abstract: The register has a flat plate flush with the false ceiling. The plate has a series of rectangular openings through which air is discharged and vertical side plates which serve to grip and attach a supply air box behind the plate. The box has stub openings which attach to the supply air trunking and it distributes the air along the length of the plate. There are damper vanes in the box pivoting on axis parallel to the length of the plate and adjustable by levers projecting through slots in the plate.

External adjustable driving mirror - has direct coupled controls through mounting foot with two adjusting axes

Abstract: The mirror is supported between the forked ends of a support cradle which has a stub which extends through the car body to a fitting screw on the inside The cradle is pivotted about its longitudinal axis to alter the inclination of the mirror wrt the ground The stub is hollow and carries a central shaft with a knurled adjusting knob on the inside of the car, and with a pinion on the outside The pinion is located in a cut-out in the side of the mirror housing and engages a small rack by means of which the mirror is tilted about a vertical axis The short, non metallic controls give a direct, positive drive to the mirror adjustment

Rectangular path windscreen - with double hinged wiper arm having self adjusting belt drive

Abstract: The wiper linkage has a reciprocating rack which drives a wiper stub. The wiper is pivoted about the stub and has a second pivot point some way up the arm so that the wiper blade can tilt w.r.t. the wiper arm. The coupling between the stub axle and the second pivot is by means of an elastic belt drive. In order to take up any slack in the belt is taken up by a spring loaded ratchet which alters the setting of the second part of the wiper arm w.r.t. the stub axle. The elastic belt operates quietly and efficiently.

Tuning mechanism for reflector of SW aerial - has double line as stub with shorting bridge adjusted by remote control

Abstract: Tuning mechanism for the passive reflector of a shortwave aerial operated over various frequency ranges. A double line is connected to the reflector to be used for stub matching purposes. This is done by changing the reactance of the two lines by a shorting bridge moved along on a carriage. The carriage is mounted on rollers, of which the contact rollers are connected to the shorting bar. There are also two guide rollers and two pressure rollers and these are used to insure good electrical contact. The position of the carriage is adjusted via a pulley system linked up between the two masts and operated by a remote drive.

An Analytical Examination of Impedance and Signal Power Levels Along a Multiplex Data Bus

Abstract: : Using MIL-STD-1553 (USAF) as a guide in defining a Multiplex Data Bus, this paper presents in graphical form the results of a series of calculations to determine bus impedance, stub impedance, and signal power levels along a Multiplex Data Bus The paper also discusses the significance of these parameters in MUX Bus operation