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Proceedings of the IRE

Issue 9 • Date Sept. 1940

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Displaying Results 1 - 16 of 16
  • [Front cover]

    Page(s): c1
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  • Rochester Fall Meeting

    Page(s): c2
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  • Table of contents

    Page(s): nil1
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  • Information about the Society

    Page(s): nil2
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  • Some Problems of Disk Recording

    Page(s): 389 - 398
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    The general trend of recent statistics indicates that recordings have become more and more important in the radio Ind home-entertainment field. It is therefore timely to investigate the present status of the art. It is shown that the lack of standardization in the recording characteristics of commercial shellac pressings makes it rather difficult to provide correct equalization for playback. A compromise equalization is suggested. It is also pointed out that new lightweight pickups with their permanent jewel styluses do not require the abrasive surfaces which are provided in present shellac pressings. Considerable improvement can be expected with respect to the signal-to-noise ratio of recordings if the general use of lightweight pickups makes it possible to use better disk materials. Vertical versus lateral recording is briefly discussed, and it is pointed out that even for transcription work the likelihood is that lateral recording will regain its predominance. The almost complete lack of standardization in the field of instantaneous recording is shown. Some general problems in the field of disk recording are discussed and considerations entering into the design of a cutter are outlined. Since the art of instantaneous recording has just begun to develop, new recording materials will have to be investigated in order to cut the price to the point where direct recording can enter the home-entertainment field. The relative merits of different methods of regulating the depth of cut are discussed. The requirements for matching a cutter to an amplifier for different frequency characteristics of cut are also explained. View full abstract»

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  • On the Right- and Left-Handedness of Quartz and Its Relation to Elastic and Other Properties

    Page(s): 399 - 406
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    The confusion concerning the elastic properties of quartz which exists in the literature of the piezoelectric resonator is pointed out. Emphasis is placed on the accepted definitions of right and left quartz and of right- and left-handed optical rotation, the disregard of which by authors, together with a rather free use of axial systems of their own choosing, sometimes obscurely defined, is responsible for the confusion. An independent experimental investigation is made of the interrela-tions between piezoelectric polarization, optical rotatory power, elastic compressional compliance, and characteristic etch markings and thereby with the natural face forms of the quartz. Particular care is taken to avoid any possible errors in sign in relating these properties, and a number of such errors in the literature are pointed out. The etch pattern on a quartz sphere is described as well as its use as a reference standard in determining the orientation of quartz resonators by means of the etch patterns on their faces. View full abstract»

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  • The Generation for Television of Horizontal Synchronizing Pulses from Vertical Pulses by Means of Impulse Excitation

    Page(s): 406 - 409
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    Impulse excitation is employed to produce horizontal synchronizing pulses for television directly from the vertical pulses. The simple equipment to do this and to produce odd-line interlaced synchronizing are described. View full abstract»

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  • Field Strength of Motorcar Ignition between 40 and 450 Megacycles

    Page(s): 409 - 412
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    Measurements of motorcar-ignition peak field strength were made on frequencies of 40, 60, 100, 140, 180, 240, and 450 megacycles. Propagation was over Long Island ground and the receiveng antennas were 35 feet high and 100 feet from the road. Under these conditions, the average field strength varied about 2 to 1 over the frequency range. Curves show the maximum field strength versus frequency for 90, 50, and 10 per cent of all the measurements. Vertical and horizontal polarization are compared showing slightly greater field strength, in general, for vertical polarization. New cars, old cars, and trucks are compared showing no large differences of ignition field strength. Some of the factors involved in motorcar-ignition radiation are mentioned. Theoretical propagation curves are included and the measuring system is briefly discussed. View full abstract»

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  • A Useful Network Theorem

    Page(s): 413 - 417
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    A theorem is developed for finding the steady-state voltage between two points 0 and 0' of a network having the following characteristics. Any number of (linear bilateral) impedances meet at the junction 0'. The voltages from 0 to the opposite ends of these impedances are known. These voltages and impedances are all that need be specified about the network. The theory is both simple to remember and simple to apply in problems where either a literal or a numerical solution is desired. In complicated networks it is a considerable timesaver over the more conventional method involving the simultaneous solution of a number of Kirchhoff's mesh equations. The theorem should find wide application, particularly in many linear-amplifier problems. The method of using the theorem and the relative simplicity with which results can be obtained is illustrated by considering five physically different (although mathematically quite similar) types of networks; namely, a T network, an unbalanced three-phase Y-connected network, a triode amplifier (account being taken of its interelectrode capacitances), the conventional resistance-capacitance coupled amplifier, and a two-stage parallel-feedback amplifier. View full abstract»

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  • Determination of the Axial Potential Distribution in Axially Symmetric Electrostatic Fields

    Page(s): 418 - 420
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    It has long been known that the potential distribution in axially symmetric electrostatic fields can be expressed in terms of a Fourier integral. This form of solution is not generally very useful because of the difficulties encountered in evaluating the integral. The present paper shows how this integral can be evaluated for a particular type of potential distribution, and shows how it may be applied to obtain the variation in potential along the axis when the potential variation along any cylinder is known. The result is then used to obtain an approximate solution for the particular case of two infinitely long cylinders of equal diameter separated by an amount comparable to their diameters. View full abstract»

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  • Institute news and radio notes

    Page(s): 423 - 428
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  • Correspondence: Piezoelectric crystals

    Page(s): 428 - 429
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    In this issue of the PROCEEDINGS there appears an article by Professor Karl S. Van Dyke discussing the various conventions used with regard to quartz crystals and methods for establishing correct orientations in the crystal. He points out the need for standardizing on methods for designating crystals. This is a project in which we have tried to arouse interest without much success (original correspondance item from 1939 is included). In 1938 a pamphlet by the National Physical Laboratories appeared which attempted to standardize a notation with respect to quartz. It still appears desirable to have these matters considered by a standardizing committee. Since Professor Van Dyke has investigated the matter of terminology and conventions applicable to quartz rather completely, we suggest that he be appointed chairman of such a committee. View full abstract»

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  • Contributors

    Page(s): 429 - 430
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  • Positions open

    Page(s): xi
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  • Display advertisers

    Page(s): xii
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Aims & Scope

This Periodical ceased production in 1962. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope