US1791541A - Radio signaling apparatus - Google Patents

Description

Feb, 10, 1931. G. o. SQUIER RADIO SIGNALING APPARATUS Eiled Nov. 14, 1927 ficev'nwy Warm I l/Va a val? 5 as the carrier of radio Patented Feb. 10, 1931 r UNITED STATES PATENT; OFFICE- GEORGE OWEN SQUIER, OF WASHINGTON, DISTRICT OF COLUMBIA RADIO SIGNALING APPARATUS Application-filed November 14, 1927. Serial No. 233,010.

This invention relates to radio signaling apparatus and more particularly to the provision of means for enabling the'utilization of power lines, such as telephone wires, electric light wires, etc. for the absorption element or antenna of'radio receiving systems.

One of the ob'ects of my invention is to provide a simple, economical and efficient attachment to enable the utilization of existing lines as an antenna. v. V

A further object of the invention is to provide a device of this character to overcome the difliculties incident to the effect on radio receiving apparatus of disturbing electrical effects present in such lines.

Further objects of the invention will appear more fully hereinafter.

Theinvention consists substantially in the construction, combination, location and relative arrangement of parts, as well as in the circuit arrangement employed therein, or as shown in the accompanying drawing and finally pointed out in the appended claims. I

Referring to the drawings,-

Figure 1 schematically illustrates one arrangement embodying the subject matter of my invention. 1

Figure 2 is a similar view showing a modified arrangement. 7

I Figure 3 is a similar View showing a fur-v ther modification.

Figure l is a view partially in vertical cross-section of a plug embodying my invention.

The same parts are designated by the same reference characters wherever they occur throughout the several views.

While many arrangements have been heretofore'proposed, some of which have gone into use of employing power lines, such as telephone wires, electric light wires, power transmission lines, etc., to act as the absorption element or aerial for radio signals, or frequency currents of a wired-wireless system, no suitable provisions were made to eliminate disturbances from the line. In addition to the natural static or electrical disturbances on such lines, there are many so-called man-made static efi'ects which increase the disturbing for example,

effect of suchlines on the radio apparatus employed in connec tion only a few in c ployed today on power oil burning heaters, vators and medical machines, variety of other apparatus.

tion therewith. To menommon use, there are emlines of this character dental apparatus, eleand a large Efforts have been made to diminish this form of disturbance and interference by choke coils inserted in the employment of the line and by-pass condensers. Apparatus generally employed for this correction is of That 15, the capacities are measured in micro-farads an carry thepower of the line.

quired to the audio frequency (1 the choke coils arereother words, up to the present time such c'orrection,; where correction is in fact secured is made by robust traps and not by means of radio apparatus.

The present invention relates to the pro- VlSlOIl of a small inexpensive but highly efficient device employing accomplishing this thereof is efiected at the radio ap- It is among the special purposes plishment paratus.

radio principles for result, where the accomof my present invention to provide a plug which can be lnserted in a standard socket,

in a standard electric light socket, or service outlet, which will permit the clearing out of all now on such power lines,

electrical load and turbances thoroughly, so that disturbances, which due to its regular cleaning out the line distlie high he quency current itself is sorted out and delivered to the receiving set.

In accordance with my invention instead of having aplug such as has heretofore been employed consistin condensers incapable of two small blocking g of effectively absorbing energy, I provide a plug employing a valuable transformer, which.

drain of. through ances on the line,

enter the secondary of Y to the loose coupling employed.

which are not designed to all disturbpermitted to the transformer due is suitably the primary Referring to the drawmgs, in which I have diagrammatically illustrated the principle of my invention, nates a power line form shown consis reference character 1 desigwhich in the particular ts of a two-wire electric light circuit for lighting lamps, diagrammatically illustrated at 2. The radio apparatus in this instance, a radio receiving set is diagrammatically illustrated at 3. The power line is connected through a condenser -11 to ground 5 through a primary coil 6 of a transformer, the secondary coil 7 of which is adjustably coupled therewith, the terminals of the said secondary coil being connected to the radio receiving apparatus 3.

In Figure 2, a modified arrangement is shown wherein instead of connecting the power line through a condenser it, two 0011- densers S and 9 are connected between the wires 1 of the power line and the tap. connection for the radio receiving apparatus 3 is madebetween the two condensers 8 and 9.

In Figure 3, the condensers 8 and!) are connected through two primar 'coil-slO and 1 connected in series, the ground connection 5 being provided between the-two coils l0 and 11. In this arrangement it is not necessary to ground the radio receiver, the terminals of which include two primary coils 12 and 13, which are preferably wound in opposite directions, so as to produce electromotive forces of the same direction from the primary coils 10 and 11.

The couplings of the transformers are so desi ned as to permit the effective transfer of t e high frequency signal-energy to the receiver, but at the same time effectively blocking the transfer of disturbances which are generall of low frequency character. These transformers can be built very compactly andenclosed in a plug of the dimen- SIOIIS now in use to.

For example, the standard electriclight socket is illustrated at 21. The plug is formed in two parts. One part 20 screws into the socket and forms an electrical contact with one terminal therein. A wire 22 ineludes the primary coil and the condenser i The body of the plu 20 is provided with exterior threads as shown. over which fits the auxiliary body 3, thereon, so as to vary the coupling of the secondary coil 7 carried therein. In this way the couplings in these plugs could be adjustable for each locality to suit the particular frequency of the signals, which are received in that particular locality. The terminals of the transformer winding 7 are illustrated at 24 and may be included in a single cord, similar to a telephone cord, if desired.

W'hile I have shown the arrangement of Fi ure 1 incorporated in a plug structure, it wil be readily apparent that the arrangements of the other figures of the drawing, as well as many modifications thereof, which willsuggest themselves to those skilled in the art may equally well be incorporated in single plug structures.

It will now be seen that the high frequency and hereinbefore referred which adjustable signals collected or guided by the power lines together with the relatively lower frequency static effects are discharged from the power lines through the ground, the high frequency or signal currents being induced in the secondary coil of the transformer associated with the primary coil included in the grounded path. The adjustable coupling between the transformer coils permits a control of the efliciency of elimination of the disturbing effects, which will be largely dependent upon the particular locality, the nature of the dis turbing effects, etc.

Many modifications and changes in details will readily-occur to those skilled in the art withoutdeparting from the spirit and scope of my invention as defined in the claims and I, therefore, desireto have the foregoing description regarded in the illustrative sense rather than in a limiting sense. It will likewise be understood where I have herein and will hereinafter refer to power lines I desire to have this term include all such lines as are employed in electric lighting systems, transmission of power, telegraph, telephone and in general all systems which employ lines for the conduction of the electric current therefor.

Having now. set forth the objects and nature of my invention and having shown and described structures and arrangements embodying the principle thereof, what I claim as new and useful and of my own invention and desire to secure byLetters Patent is 1. Means for utilizing a power line provided with a standard socket for radio reception comprising a plug for insertion into said socket, a transformer included in said lug, means for connecting the terminals of one winding of said transformer to a radio receiving set, and means forming part of said plug for adjusting the coupling between the windings of said transformer.

2. Means for utilizing a power line provided with a standard socket for radio reception comprising a plug for insertion into said socket, a transformer included in said plug, means for connecting the terminals 0" one winding of said transformer to a radio. receiving set, means forming part of said plug for adpisting the coupling between the windings of said transformer, said means varying the position of one winding of the trans former relatively to the other winding therc- O 3. Means .for utilizing a power line provided with a standard socket terminal for reception of radio signals comprising a plug adapted to be detachably inserted in said socket for electric connection with said power line and having a primary coil included there in and in said connection, a movable member carried by said plug and provided with a secondary winding for mounted therein and wires leading from said transformer.

said plug, from the winding.

In testimony 5 my hand on this one from said connection and two termmals of the sad secondary whereof I have hereunto set 3rd dey of November, A. D.

GEORGE OWEN SQUIER.

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