US1702039A - Signaling system and method of signaling - Google Patents

Description

' Feb. 12, 1929. 1,702,039

H. CHIREIX SIGNALING SYSTEM AND METHOD OF SIGNALING Filed Aug. 22, 1924 HENR! cHmEiX 1 ANVENTOR ATTORNEY Patented Feb. 12, 1929..

STATES HENRI CHIREIX, OF PARIS, FRANCE.

SIGNALING ESYSTEM QLND METHOD OF SIGNALING.

Application filed August 22, 1924, Serial No. 733,500, and in France August 23, 1923.

It is a well-known fact that the loops of frames (coils) used in wireless telegraphy work for reception can also be used for transmission. It is likewise well known that the E-electrode valve may be used for obtaining alternating current of high-frequency when connected to appropriate circuits. Now, one of the objects of this invention is to utilize a loop or coil preferably constituted of but one turn also as the working circuit of the valve and to thus simplify to the highest possible extent the requisite circuits in order to realize a good efiiciency.

A clear understanding of the invention will be had from the following description when taken in connection with the accompanying drawing in which Figure 1 illustrates a transmitting arrangement employing a frame or loop having a single turn; Figure 2 represents in perspective an an tenna system in the form of a prism; and Figure 3 represents the entire transmitter adapted to be used with the system shown in Figure 2.

Referring now to Fig. 1, element 1 is the triode, the plate of which is fed by a dynamo 2 through the choke coil 3, the filament being heated from a battery 4. The high frequency output circuit consists of the blocking condenser 5 and the coil 8 closed upon the condenser 7 6 is a condenser shunted by a grid leak resistance inserted in the grid circuit in order to reduce the mean potential during operations. Thev connection 9 of the grid is brought to one side of the condenser 7, the connection 10 of the filament is established at any desired point along the coil, while the connection 11 is made at any desired point at the other end of the coil. The condition for maintaining sustained oscillations is more readily fulfilled as the connection 11 is made nearer the condenser; on the other hand, the energy supplied to the coil is in general increased by shifting the connection 11 towards the connection 10, which has the effect of producing closer coupling between the grid and plate circuits.

The coil 8 is preferably made up of a single turn or spire madeof a strip ortube of conducting metal of large cross-section in order to reduce its resistance. It may be of any desired form; still the circular shape seems to be best suited, seeing that this shape, for a given surface, results in the least perimeter and as a consequence a min imum of resistance for a given'section. The connections 10 and 11 are preferably brought from a fixed support inthe center of the coil, where connection is established with the filament and plate electrodes of the tube, while the terminal contacts of 10 and 11 are shiftable along the coil.

It must be well understood that, in order that self-excitation may be produced, it is necessary that the resistance of the device in order be suiliciently low in order that the high frequency current produced inaygive rise across the terminals of condenser 7 to a tension the value of which is in the neighborhood of that of the direct current source 2. For this reason the coil should he made of a large section; the condenser 7, on the other hand, should be made of mica of high grade, or better still may be an air-condenser. 1

If in spite of these precautionary measures it should not be possible to maintain operation, a plurality of valvessuch as 1 may be disposed in parallel, or else valves ojf'the same power may be employed and operated at a lower voltage. In order to reduce the losses it may bedesirable to connect a certain point of the coil with the ground, or else to place underneath the coil a metallic lattice. V e

The transmitter described above will have a directional characteristic, and whilethis may be of advantage in certain cases, it may be a drawback in others.

In cases in which non-directive sending is desired, the transmitting system may consist, for instance, of three conductors placed parallel to one another in a vertical sense, such as I, H, III, in Fig. 2, and arranged conformably with the generatrices of a prism the base of which is an equilateral triangle. The upper ends of these three conductors are connected together byother horizontal conductors forming the sides v of an equilateral triangle, and in these conductors there are inserted the capacities of the high frequency circuits (triangle mounting). The lower ends of the said three conductors are connected at a central point by other horizontal conductors (star connection). These conductors most preferably, as in the case of the simple coil or'loop above referred to, are made up of tubes constituting conductors of low resistance.

- In order to better understand. this construction, the upper'and lowerplanes of the prism are separately shown in Figure 3, it being understood that the vertical conductors I, II and III of Figure 2 extend respectively between II, II-JI and IIT-lIIas indicated in dotted lines.

V The three vertical conductors function and behave like threevertical antennae; by sending three-phase currents therethrough, a rotary-ield. emission is obtained which can be equally well received in all directions. 7

This scheme is easily practiced by eniploying-three tubes anda symmetric mounting as indicated by M. Mesny French Patent No. 552,227 1 stands for the dynamo, 2 are choke coils intended to;preven't return'flow of the high frequency oscillations,

sure" blocking condensers intended to -pre-.

vent short-circuiting of the source, t are the three valvesthat are required forthe three conductors I, II, and III, respectively; die the battery insuring their joint heating, 6

v the grid resistance of each of the said valves,

7 sers through which which is intended to lower, when in opera tion, the mean value of'the grid potential; 7

are the capacities which conjoint-1y with 6 insure this result; '8 finally are the conden the high frequency current flows.

The reactance filamentis given by the vertical conductors. The reaction voltage is properly taken, as indicated, between the middle point of the lower star and the middle pointof the capacities It will easily be understood that it has the desired pha'se for the purposeof self-excitation. The system as hereinbefore described could be compared to three coils (loops) displaced by an angle of 120 degrees, all three having one common side; the

said side, as to the rest, may be eliminated entirely as it is passed by'a Zero current (like a neutral wire in a three-phase system In the illustration this return conductor, which is not required and therefore has been omit- .ted, would evidently start from the middle of the star; V k

This comparison, as a matter of fact, will make it evident that the scheme as described isan extension of the first embodiment described; r

' By providingfour conductors. and four valves it would be possible to construct a two-phase arrangement, while' 'with any debetween the anode and the sired greater number of tubes it would be possible to obtain polyphase sending made up of a definite number of phases. It is also quite obvious that the arrangement indicated is not the only one adapted to'furnish to the antenna system. hereinbefore described the three-phase energy required for its operation, indeed, it is merely one of the most simple'embodiments, and is here cited within the spirit and scope'of my invention. 7

Claims:

1. An arrangement for. the production of a revolving field especially adapted to the transmission of short waves, comprising an aerial system disposed in accordance with a three-sided prism, and a three-tube generator generating a revolving field directly in the aerial system, which constitutes at the same time the oscillation circuit.

2. In a shortwave transmission system, a plurality of vertical antennae arranged in prismatic formation, a'condenser connected etween each adjacent pair of antennae at their upperends, a pair of condensers connected between each adjacent pair of antennae at their lower ends, a plurality of oscillation generators, one for each vertical antenna, each having its anode circuit associated with the upper end of a corresponding antenna, and a connection from between each pair of condensersatthe lower ends of the antennae to a corresponding control electrode of each oscillation generator.

3. An arrangement for the production of 11 a revolving field especially adapted to the transmission of short waves, including an aerial system comprising three vertical conductors disposedin accordance with a threesided prism, a condenser connected between each adjacent pair of conductors at their upper ends,a pair of condensers connected between eachadjacent pair of'conductors at their lower ends, a three-tube generator associated with each vertical conductor of the aerial system, the'output of each generator being connected to the upper end of a cor responding conductor, and theinput of each generator being connected between each pair of condensers connecting the lower endsof said conductors. Q r r 4:. In a shortwave transmission system,

a plurality of vertical antennae arranged in their upper ends, a pair of condensers coning antenna, its control electrode circuit nected between each adjacent pair of anconnected between a corresponding pair of tennae at their lower ends, a Y connection to condensers at the lower ends of the an- 10 the antennae at their lower ends, a plurality tennae, and its cathode circuit connected to 5 of oscillation generators, one for each verthe midpoint of the Y connection at the tical antenna, each having its anode circuit lower end of the antenna. connected to the upper end of a correspond- H. CHIREIX.

CERTIFICATE OF CORRECTION. Patent No. 1,702,039. Granted February 12, 1929, to

HENRI CHIREIX.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 67, strike out the words "in order" both occurrences; and that the said Letters Patent should he read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of July, A. D. 1929.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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