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Radio Engineers, Proceedings of the Institute of

Issue 6 • Date June 1935

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  • [Front cover]

    Publication Year: 1935 , Page(s): c1
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  • Institute of Radio Engineers Tenth Annual Convention Hotel Statler, Detroit Michigan July 1, 2, and 3, 1935

    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 May 1, 1935

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

    Publication Year: 1935 , Page(s): v
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  • Officers and Board of Directors

    Publication Year: 1935 , Page(s): vi
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  • Convention Headquarters. Hotel Statler, Detroit, Michigan

    Publication Year: 1935 , Page(s): 546
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  • Institute news and radio notes

    Publication Year: 1935 , Page(s): 547 - 568
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  • Image Suppression in Superheterodyne Receivers

    Publication Year: 1935 , Page(s): 569 - 575
    Cited by:  Papers (1)
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    Superheterodyne receivers are particularly sensitive to interference at the intermediate frequency and at the image frequency. Several types of selective circuits are described for coupling the antenna to the grid of the first tube which have especially great selectivity against such interference. The number of selective circuits which must be tuned to the signal is thereby minimized. Performance curves are given for receivers having intermediate frequencies of 175 or 450 kilocycles. View full abstract»

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  • Discussion

    Publication Year: 1935 , Page(s): 576 - 577
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  • The Design and Testing of Multirange Receivers

    Publication Year: 1935 , Page(s): 578 - 592
    Cited by:  Papers (11)
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    The principal difficulties in the design of high-frequency receivers reside in the complexity of the multirange circuits. Several ctrcuits and a unit assembly arrangement are described which improve the frequency calibration and simplify the design. Testing is facilitated by the use of simplified signal generators having "piston" attenuators. The attenuator comprises a pair of coplanar coils, coaxial coils, or condenser plates, one fixed and one movable axially in a moderately long cylindrical copper shield. The attenuation in decibels is directly proportional to the displacement of the movable element, and the calibration can be comnputed. View full abstract»

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  • Discussion

    Publication Year: 1935 , Page(s): 592 - 593
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  • High Fidelity Receivers with Expanding Selectors

    Publication Year: 1935 , Page(s): 594 - 609
    Cited by:  Papers (2)
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    A high fidelity receiver for general use requires means for continuously expanding or contracting the resultant band width of all the carrier selectors, in order that the best compromise between fidelity and selectivity may be chosen for any given operating conditions. The expanding selector ("XPS") arrangement may be adapted for either unsymmetrical or symmetrical expansion of the resonance curve. Arrangements are described and the relative merits are discussed for both kinds of expansion. A superheterodyne receiver is described, which has a preferred form of symmetrical expanding selector, as wvell as other advantageous features. A tuning and expanding mechanism is described, in which the expansion is adjustable by moving the tuning knob in the axial direction. The mechanism includes an interlock which permits the operator to tune the receiver only when the band width is contracted. The operator is thereby constrained to follow the correct procedure of first tuning with maximum selectivity, and second, expanding to improve the fidelity to the (extent permitted by noise or adjacent channel interference. View full abstract»

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  • Acoustic Testing of High Fidelity Receivers

    Publication Year: 1935 , Page(s): 610 - 617
    Cited by:  Papers (1)
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    The broadcast listener desires the illusion of being present in the auditorium or studio where the sound is being produced. Therefore the sound heard by the listener in a living room should have essentially the same qualities. In broadcasting, the studio reverberation, the microphone technique, the loud speaker characteristics and the living-room reverberation are among the more important factors which must coöperate in obtaining the desired illusion. The latter two factors are evaluated by testing the loud speaker in representative living rooms. The test microphone is located respectively at each of three stations selected to be representative of listening points. Acoustic fidelity curves for these stations are superimposed on a single record. An acoustic recorder is described which has been developed for automatically tracing each curve in about three minutes. Curves are reproduced which show the effect of frequency wobbling in integrating the reverberation. View full abstract»

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  • High Quality Radio Broadcast Transmission and Reception

    Publication Year: 1935 , Page(s): 618 - 652
    Cited by:  Papers (1)
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  • A High-Frequency Sweep Circuit

    Publication Year: 1935 , Page(s): 653 - 657
    Cited by:  Papers (1)
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    A linear high-frequency sweep circuit for the cathode ray oscillograph is described. It employs a linearly charged condenser periodically discharged by a hard tube, the grid of which is biased past cut-off except for short periods when it is driven positive by an auxiliary oscillator. The frequency of this oscillator is made commensurable with that of the unknown wave form to be investigated. The circuit is particularly adaptable for high frequencies, photographs of alternating voltages of frequencies up to twelve megacycles being shown. View full abstract»

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  • Report on Ionization Changes during a Solar Eclipse

    Publication Year: 1935 , Page(s): 658 - 669
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    The effect of a solar eclipse upon air layers ionized by different solar agencies is described, and the observations of the actual eclipse changes in ionized layers are considered. The conclusion is reached that the normal ionizing agency for regions E and F1, has a speed closely agreeing with that of light; hence it is natural to identify this agency with ultra-violet light (though observations of the kind here considered cannot rule out the possibility that the agency, for one or more of these layers, consists of very high speed corpuscles). Similarly there is fairly definite evidence that ultra-violet light contributes at least a part of the normal region F2ionization, and a suggestion that corpuscles may also contribute. In future eclipses it is very desirable that attention should be specially concentrated on this region F2. View full abstract»

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  • Diurnal and Seasonal Variations in the Ionosphere during the Years 1933 and 1934

    Publication Year: 1935 , Page(s): 670 - 681
    Cited by:  Papers (1)
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    The most important results of daily ionospheric measurements made at Deal, New Jersey, latitude 40° 15′N., longitude 74° 02′ W., over the period from March, 1933, to May, 1934, are given in this paper and may be summarized as follows: 1. There was a definite correlation between the noon value of ionic density of the F1region and magnetic disturbances, a decrease in ionic density being obtained on magnetically disturbed days. 2. The noon value of ionic density of the E and F1region attained a maximum in summer and a minimum in winter whereas the reverse condition, of minimum in summer and maximum in winter, was found for the F2region. 3. The time of maximum ionic density of the F2region varied with the seasons of the year, occurring near noon in winter and near sunset in summer. The paper also shows a series of virtual height contour maps for the four seasons of the year. View full abstract»

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  • Correction

    Publication Year: 1935 , Page(s): 682
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  • Contributors to this issue

    Publication Year: 1935 , Page(s): 683 - 684
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Aims & Scope

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

Full Aims & Scope