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Radio Engineers, Proceedings of the Institute of

Issue 7 • Date July 1935

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  • [Front cover]

    Publication Year: 1935 , Page(s): c1
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  • Institute of Radio Engineers - Forthcoming Meetings

    Publication Year: 1935 , Page(s): c2
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  • Contents

    Publication Year: 1935 , Page(s): i
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  • General Information

    Publication Year: 1935 , Page(s): ii
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  • Institute sections

    Publication Year: 1935 , Page(s): iii
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  • Geographical Location of Members Elected June 11, 1935

    Publication Year: 1935 , Page(s): iv - v
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  • Applications for Membership

    Publication Year: 1935 , Page(s): vi - vii
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  • Officers and Board of Directors

    Publication Year: 1935 , Page(s): viii
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  • Institute news and radio notes

    Publication Year: 1935 , Page(s): 685 - 700
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  • A Single Side-Band Short-Wave System for Transatlantic Telephony

    Publication Year: 1935 , Page(s): 701 - 718
    Cited by:  Papers (15)  |  Patents (1)
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    This paper describes the construction of a short-wave single side-band reduced-carrier system of radio transmission. It also reports the results of comparisons made between this system and an ordinary short-wave double side-band system between England and the United States. It was found that the single side-band system gave an equivalent improvement in radiated power over the double side-band system averaging eight decibels. This is in good agreement with the theoretical improvement to be expected. View full abstract»

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  • Monitoring the Standard Frequency Emissions

    Publication Year: 1935 , Page(s): 719 - 732
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    The method and equipment used in monitoring the standard frequency emissions are described in this paper. The emissions are continuously recorded in terms of the primary standard of frequency maintained by the Bureau of Standards. By means of selector circuits and frequency multipliers the received signal is heterodyned with the appropriate harmonic of the primary standard. The beat frequency is then recorded on a recording potentiometer by means of a circuit arrangement which produces a potential difference that is proportional to the frequency difference. The records show that the emissions have been in agreement with the primary frequency standard within two parts in one hundred million at practically all times, and the absolute value of the frequency transmitted is rarely in error by as much as one part in ten million. View full abstract»

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  • Recent Studies of the Ionosphere

    Publication Year: 1935 , Page(s): 733 - 751
    Cited by:  Papers (1)
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    Results of ionosphere measurements utilizing transmissions at vertical incidence and made weekly over a period of eighteen months are discussed. Typical graphs of diurnal variations of the E-layer critical frequency and its relation to the ionizing force of the sun are shown for three seasons. Similar graphs for the F2layer are included as well as a seasonal curve of midday, and maximum critical frequencies of this layer. The absence of midday F2critical frequencies during the summer is pronounced. A sporadic E layer appearing at the same virtual height as the normal E, and after the normal E has reached its critical penetration frequency, is discussed. A comparison of its appearance with local thunderstorms, is tabulated. The presence of a tentatively named G layer is indicated. View full abstract»

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  • Analysis of the Operation of Vacuum Tubes as Class C Amplifiers

    Publication Year: 1935 , Page(s): 752 - 778
    Cited by:  Papers (9)
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    The operation of class C amplifiers under carrier and modulated conditions is analyzed with the aid of constant-current charts. With these charts one can precalculate all operating factors such as output, efficiency, and grid driving power. The analysis discloses certain fundamental differences in the behavior of modulated amplifiers connected with self-bias and fixed, or generator bias operation. Audio harmonic distortion traceable directly to the amplifier is discussed in detail, together with methods for "compensating" the grid excitation to eliminate this distortion and to increase the operating efficiency. Oscillograms of the audio relations in modulated class C amplifiers experimentally verify the theoretical conclusions. The problems of grid excitation power, "true" grid dissipation, and "effective" plate dissipation for modulated amplifiers are treated for three tubes differing only in their amplification factors. View full abstract»

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  • New Method for Eliminating Static Caused by Trolley and Electric Cars

    Publication Year: 1935 , Page(s): 779 - 780
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  • Anomalous Transmission in Filters

    Publication Year: 1935 , Page(s): 781 - 784
    Cited by:  Papers (1)
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    It is well known that the terminating impedance plays an important rôle in the action of a filter. Using a terminating impedance which approximates the negative of the usual iterative impedance is shown to result in transmission not specified by ordinary filter theory in addition to that in the customary pass bands. The effect is essentially one of resonance which can be produced in a suppression band. View full abstract»

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  • A Sixty-Cycle Bridge for the Study of Radio-Frequency Power Amplifiers

    Publication Year: 1935 , Page(s): 785 - 806
    Cited by:  Papers (1)
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    A selective bridge, consisting of three resistive arms and a fourth arm comprising a sinusoidal sixty-cycle voltage, has been devised and applied to the study of radio-frequency power amplifiers. In Part I the measuring circuits are described, and in Part II some typical data on a type 10 tube are presented. The observed linearity of contours of constant plate loss on a diagram plotted to the coördinates of output carrier-frequency voltage and plate-battery voltage is discussed, and a very simple circuit, based on this result and useful for rough measurements, is described. View full abstract»

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  • Measurement of Radio-Frequency Impedance with Networks Simulating Lines

    Publication Year: 1935 , Page(s): 807 - 826
    Cited by:  Papers (2)
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    The complex value of an impedance may be measured at radio frequencies by measuring voltage ratios on a transmission line terminated in the unknown impedance. The line may often be replaced advantageously by an equivalent network. Several new methods of carrying out the measurement have been developed and a study of the factors affecting the accuracy and the technique of manipulation has been made. Optimum accuracy obtains when the characteristic impedance of the network and the impedance to be measured are equal. Only two quantities need be accurately known; viz., (1) the capacitance of a variable condenser, and (2) the frequency of the applied voltage; this is a decided advantage at radio frequencies. The conditions imposed on the voltmeter are easily satisfied in practice. A common lead connecting generator, voltmeter, network, and unknown impedance makes grounding and shielding simple. Experimental results at frequencies from 50 to 1500 kilocycles have agreed well with the computed performance of the device and they demonstrate the practicability of the method. View full abstract»

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  • Books Received

    Publication Year: 1935 , Page(s): 827
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  • Bookelts, catalogs, and pamphlets received

    Publication Year: 1935 , Page(s): 828
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  • Contributors to this issue

    Publication Year: 1935 , Page(s): 829 - 830
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Aims & Scope

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

Full Aims & Scope