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Radio Engineers, Proceedings of the Institute of

Issue 5 • Date May 1937

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  • [Front cover]

    Page(s): c1
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  • Institute of Radio Engineers Silver Anniversary Convention

    Page(s): c2
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  • Contents

    Page(s): i
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  • General Information

    Page(s): ii
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  • Institute sections

    Page(s): iii
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  • Geographical Location of Members Elected April 7, 1937

    Page(s): iv
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  • Applications for Membership

    Page(s): v - vi
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  • Officers and Board of Directors

    Page(s): vii
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  • Statue of Liberty

    Page(s): 522
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  • Institute news and radio notes

    Page(s): 523 - 548
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  • A Simplified Circuit for Frequency Substandards Employing a New Type of Low-Frequency Zero-Temperature-Coefficient Quartz Crystal

    Page(s): 549 - 563
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    This paper presents a new type of stabilized quartz-controlled oscillator and a new type of low-temperature-coefficient piezoelectric quartz circuit element which, in their combination, are particularly suitable for portable substandards of frequency. The oscillator circuit is simple and may be easily stabilized by two reactance adjustments so that the frequency is unaffected by change of tubes or by small changes in the circuit reactances, the plate voltage, and the ambient temperature. Measured stabilities are given for this circuit when constructed as a substandard of frequency, employing the new CT crystal, and generating one hundred kilocycles and its harmonics. A previously unused type of vibration in quartz plates cut at an angle to the crystalline axes provides low-frequency circuit elements with a wide range of temperature coefficients. Two specified orientations, designated as CT and DT cuts, exhibit zero temperature coefficient at specific temperatures and are closely related to the recent, but now popular, AT and BT high-frequency plates. The new plates are especially useful in precision applications for by slight final adjustment their frequency may be either raised or lowered and their temperature coefficient made either more positive or more negative. View full abstract»

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  • The Harmonic Mode of Oscillation in Barkhausen-Kurz Tubes

    Page(s): 564 - 569
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    The phenomenon of harmonic operation of Barkhausen-Kurz tubes employing a resonating helical grid is investigated by the use of tubes with the plate cut transversely into three sections. It is shown that the fundamental or Barkhausen frequency may be elicited by exciting the grid at its central portion, but that if the grid is excited at its ends either symmetrically or unsymmetrically the oscillations occur at double the Barkhausen frequency. This doubled frequency is that usually generated by tubes of this type. It is also shown that it is essential to tune the filament circuit of the oscillator if maximum power output is desired. View full abstract»

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  • Grid Control of Radio Rectifiers

    Page(s): 570 - 582
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    This paper discusses grid control for voltage regulation and protection of mercury-vapor or arcing type rectifiers for radio transmitting service. The principles of two basic types of voltage control circuits are described, and illustrated by means of diagrams. Various advantages of grid control are brought out, such as automatic starting at reduced voltage, automatic voltage regulation, and high speed electronic protection of the rectifier and the transmitter. A number of oscillograms are reproduced, illustrating several factors coming into consideration when using the automatic grid protection circuit, and showing the comparative duration of the interrupting time with and without automatic inversion of the energy stored in the filter reactor. View full abstract»

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  • The Fading Characteristics of the Top-Loaded WCAU Antenna

    Page(s): 583 - 611
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    The electrical characteristics of the original "guyed cantilever" antenna in use at WCAU are reviewed. Fading characteristics taken at several points in the service area are shown and analyzed. Probability considerations are used to place the fading phenomena on a quantitative basis. Model tests are described which led to the use of a capacitive area at the top of the tower. This capacitance consists of a set of outriggers insulated from the tower. The outriggers are then connected to the tower through an inductance. The first hat so constructed was found to be too large for good suppression of fading. The hat was reduced in size until a desirable condition was reached. Analysis of fading records, as well as listening tests, shows that the primary night service area is more than doubled and is now practically the same as the day service area. This has been accomplished with no increase in power and only a slight increase in ground signal. View full abstract»

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  • Application of the Autosynchronized Oscillator to Frequency Demodulation

    Page(s): 612 - 619
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    A new frequency-operated demodulator is described which does not respond to amplitude modulation. These results are achieved by making use of a controlled oscillator at the receiver which automatically synchronizes with the transmitter frequency. If desired, this method can be made to give a large response with extremely small amounts of frequency shift. On the other hand, it can also be used when the maximum frequency shift is many times as great as the signal band width. Other advantages are its linear response and its simplicity which requires the addition of only one tube to existing receivers. Tests show that a frequency-modulated signal and an amplitude-modulated signal may be applied simultaneously to the same carrier without noticeable interference at the receiver. Other applications of the synchronized oscillator are also described. View full abstract»

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  • Lattice Attenuating Networks

    Page(s): 620 - 622
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    The recent compilation by P.K. McElroy of resistive attenuating network sections is extended to include the lattice or bridge type section. Design formulas are developed for the general case where the terminal impedances are unequal as well as for the special case where they are equal. The minimum attenuation limitation is shown to be identical to that of the T and the π section. View full abstract»

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  • A Voltage Stabilized High-Frequency Crystal Oscillator Circuit

    Page(s): 623 - 629
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    The theory and line of reasoning used in developing this circuit are described. The circuit elements aside from the crystal are resistors and capacitances. The type 57 tube was found to fulfill to a large measure the requirements of a sufficiently high mutual conductance and a fairly high internal plate resistance in the oscillating state. A method of varying the frequency of oscillation is described. The stability using a seven-megacycle crystal was found to be within about one in twenty million for a ten per cent variation in either or both the filament and plate voltages. View full abstract»

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  • Determination of the Radiating System Which Will Produce a Specified Directional Characteristic

    Page(s): 630 - 643
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    Starting with the similarity of the radiation pattern from a pair of points to a harmonic function, it is shown that with a change in variable, the directional function can be put in a form which permits it to be analyzed into a Fourier series, each of whose terms represents a pair of sources. The same method is applied to other types of sources and arrays. The relationship is developed between source spacing and the range over which the function can be represented by the series. A number of examples are given to illustrate the application of this method. View full abstract»

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  • Book review

    Page(s): 644
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  • Contributors to this issue

    Page(s): 645 - 646
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Aims & Scope

This Periodical ceased production in 1938. The current retitled publication is Proceedings of the IEEE.

Full Aims & Scope