Measurement of Telegraph Transmission

Nyquist, H.; Shanck, R. B.; Cory, S. I.

doi:10.1109/t-aiee.1927.5061365

Cited by 11 publications

(1 citation statement)

References 4 publications

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“…Les [21]. A notre avis, l'erreur provient de l'évaluation du coefficient onc-si auquel on ne peut accéder que par des mesures expérimentales dans le système ternaire Fe-Si-C [25]. en poids, en supposant que le carbone occupe les sites octaédriques de la matrice ferritique) et enfin la concentration volumique du silicium égale à 6 % at.…”

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Ségrégation du carbone et du silicium sur la face (100) d'un alliage Fe-Si interprétation par le modèle de Guttmann

Es‐Souni¹,

Mosser²

1986

Rev. Phys. Appl. (Paris)

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2014 Les résultats expérimentaux concernant la ségrégation du carbone et du silicium à la surface (100) d'un alliage monocristallin de Fe-6 at % Si ont été interprétés par un modèle de type Guttmann. Ce modèle relatif aux solutions ternaires de substitution décrit les phénomènes de ségrégation en termes de compétition avec répulsion entre le carbone et le silicium. Un bon accord entre les courbes expérimentales obtenues par de Rugy par AES et les courbes calculées à l'aide du modèle de Guttmann a été obtenu. La valeur du coefficient d'interaction en surface entre le carbone et le silicium a été trouvée égale à 2014 23 000 J/mole. De plus, l'enthalpie de ségrégation du carbone dans le fer déterminée : 92 000 J/mole, est en bon accord avec celle trouvée par Grabke sur le fer pur.

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Ségrégation du carbone et du silicium sur la face (100) d'un alliage Fe-Si interprétation par le modèle de Guttmann

Es‐Souni¹,

Mosser²

1986

Rev. Phys. Appl. (Paris)

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Application of Printing Telegraph to Long-Wave Radio Circuits*

Bailey¹,

McCann²

1931

Bell System Technical Journal

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This paper describes certain arrangements which have been used for start-stop printing teleW"aph operation over a transatlantic long-wave radio channel and also describes results obtained from certain tests of long-wave teletypewriter transmission from Rocky Point, L. I., to Rochester, N. Y. A prediction of year-round results is obtainable by correlation of these test data with year-round noise measurement data taken at Houlton, Maine, in connection with transatlantic telephone service. P R INT I NG telegraph equipment,' because of its speed, accuracy and convenience in transmitting intelligence, has become recognized as a very useful method of telegraphy on wire circuits. It seems important, therefore, to determine something of the possible utility of present types of teletypewriters on radio circuits.It is common practice to transmit the signals for operating teletypewriter equipment over wire circuits in anyone of several electrical forms. As in earlier telegraph practice the signals are frequently transmitted as d-e impulses. More recently alternating currents of voicefrequency and of higher frequency have been employed.! In employing radio frequencies for operating teletypewriter equipment where the operating impulses are no longer guided by a wire circuit, new problems and new conditions arise, which are essentially those of radio telegraph transmission. For this reason, it is desirable to review briefly the conditions under which radio telegraph systems are operated.In manual-sending aural-receiving practice for radio telegraphy it has been customary to utilize, at the receiving end, only a marking tone or sound which is received during intervals corresponding to the time that the sending key is depressed. In transmitting signals from an arc transmitter, a signal of a different frequency is sent out during the spacing periods in order to simplify the keying process, but this spacing signal is not utilized at the receiving end. For aural reception the necessary and sufficient requirement is that the marking tone be distinguishable through the noise. Using ear receiving it is possible to distinguish the signal under a wide variation of conditions because of the ability of the ear to accomodate itself to variations in signal level and in signal-to-noise ratio.

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A Transmission System for Teletypewriter Exchange Service*

Pierce¹,

Bemis²

1936

Bell System Technical Journal

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A nationwide transmission system has been established in the United States for teletypewriter exchange service by means of which 2‐way communication between teletypewriter subscribers can be established in a time comparable to that required for long distance telephone service. A brief description of the principle of operation of teletypewriters is included in this paper as an introduction to the discussion of the transmission requirements and the plan of the present system.

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Measurement of Telegraph Transmission

Cited by 11 publications

References 4 publications

Ségrégation du carbone et du silicium sur la face (100) d'un alliage Fe-Si interprétation par le modèle de Guttmann

Ségrégation du carbone et du silicium sur la face (100) d'un alliage Fe-Si interprétation par le modèle de Guttmann

Application of Printing Telegraph to Long-Wave Radio Circuits*

A Transmission System for Teletypewriter Exchange Service*

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