US1732556A - Short wave wireless signaling - Google Patents

Description

Oct. 22, 1929. A. ESAU 1,732,556

SHORT WAVE WIRELESS SIGNALING Filed NOV. 2. 1926 19f fsqu Patented Get. 22, 1929 UNITED STATES ABRAHAM ESA'U, OF JENA, GERMANY SHORT WAVE WIRELESS SIGNALING Application filed November 2, 1926, Serial No.

This invention relates to an arrangement for the generation and transmission of wire less waves of very short length and is more particularly intended to minimize or to practically suppress disturbing influences on the reception such as those known as atmospherics and faclings. According to my in vention I provide means to generate and transmit two waves of different lengths in simultaneously by one transmitting arrangement. It has been proved by experiments that any material fluctuations in the receiving intensity due to fading occurring on both waves simultaneously may be regarded as not liable to occur. By transmitting, therefore a message simultaneously 'on two different waves and by employing a suitable receiving apparatus, in the event of the communication on one wave breaking down as a result of the afore-mentioned disturbing influences, the

other wave may be relied on to convey the message. According to my invention I combine for this purpose two transmitting tubes connected in a manner to be hereinafter described which possesses special advantages over the sending out of a message by two independent transmitters which latter presents diliiculties in the simultaneous control of the two transmitters.

The invention is more fully set forth in the following description, reference being had to the accompanying drawing showing diagrammatically a preferred embodiment of the invention Two three-electrode vacuum tubes of preferably equal dimensions 1 and 2 having respectively anodes 3 and l, grid electrodes 5 and 6 and incandescent cathodes 7 and 8, have their corresponding electrodes joined by conducting leads. 10 is a heating battery (A-battery) for the cathodes, 9 an anode battery (B-battery) and 11 is a high resistance or choke-coil placed symmetrically to both tubes between points of the connect ing leads of the grids and cathodes respect1vely. By this arrangement it is possible to generate very short electric waves, the arrangement being similar to the well-known push-pull connect-ion already known 1n shortwave work. The oscillating circu1t contains merely the inherent grid-anode capacities of 145,738, and in Germany Hovember 10, 1325.

the tubes in series and the inductance of the connecting leads, thus enabling the generation of very short waves down to a few meters wave-length.

A special feature of the invention resides in the use of a variable capacity 12 interposed asymmetrically both tubes between points of the leads connecting the grids and anodes respectively, thus forming two oscillating circuits 3, 5, 12, and 4:, 6, 12, respectively, having different natural wave-lengths. Each of both oscillating circuits contains an inherent grid anode capacity in series with the condenser 12, acting thus" as a shortening condenser, and the self-inductance of the connecting wires thereof. When employing tubes of different dimensions the connecting points of the condenser may be varied in order to obtain the same conditions, it only being always necessary to establish an electrical asymmetry. Two antenna circuits for radiating the oscillating energy may be coupled to the oscillating circuits in any known way, e. g, directly to nodes of voltage in the wave carrying members of the apparatus as dis closed, for example, by my prior Patent No. 1775. In the drawing two one-wire an .L, U0 tennee 13 and 14. are shown, directly connected to nodes of voltage a and Z) in the oscillation circuits 3, 5, 12 and 4, 6, 12, respectively. The length of each antenna may be one-fourth 0f the wave-length of the oscillation circuit with which it is connected, or a multiple thereof. A special advantage of the arrangement consists in that the energy radiated by both waves may be simultaneously controlled in accordance with signals to be transmitted in an easy way, e. g, by inserting a controlling device between the leads connecting the grids and cathodes.

What I claim is:

1. An arrangement for short-wave wireless signaling of the character described comprising in combination two three-electrode vacuum tubes having anodes, controlling gridelectrodes and incandescent cathodes, leads connecting each pair of corresponding electrodes, a variable capacity interposed between points of two of said connecting leads and forming two oscillatory circuits of different natural Wave-lengths containing each an inherent inter-electrode capacity in series with said variable'capacity and the self-inductance of the connecting loads thereof, and means to impart the generated oscillations to antenna systems for the simultaneous radiation of signals on two difl'erent wave-lengths.

2. An arrangement for short-wave wireless signaling of the character described comprising in combination two three-electrode vacuum tubes having anodes, grid electrodes and cathodes loads connecting each pair of corresponding electrodes, a variable capacity interposed asymmetrically between points of said connecting leads of the grid electrodes and anodes and forming thus two oscillatory circuits of diflferent natural wave-lengths containing each an inherent grid-anode capacity in series with said variable capacity and the self-inductance of the connecting leads thereof, and means to impart the generated oscillations toantenna systems for the simultaneous radiation of signals on two different wave-lengths.

3. An arrangement for short-wave wireless signaling as set forth in claim 2 including as high resistance placed symmetrically between points of the leads connecting the grid and cathode electrodes.

In testimony whereof I have ailixed my signature.

' ABRAHAM ESAU.

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