US1518439A - Arc transmitter for wireless telegraphy - Google Patents

Description

A. MEI SSNEZR ARC TRANSMITTER FDR WIRELESS 'TELEGRAPHY ,Filed Sept. 5, 1921 if L amvemtoz FLEX/WEE)? Mass/v5) aw his w Patented Dec. 9,1924,

UNITED STA ES PATENT cranes- ALnxANDEn mrassnnn, or BERL N, GERMANY. ASSIGN-OR r GEsELrscHArr ,ieiia DRAETLOSE TELEGRAPHIE M. B. H. HALLESCHES. or BERLIN, GERMANY, Aeonromfrron or GERMANY.

' ARC TRANSMITTER 1 0R \VIRELESS Cl.ELIBGrRAPHY I 1 Application filed September 3, 1921. Serial No. 498,416. (GRANTED umma THE raovrsrons or rm: ACT or MARCH s, 1921, nsmr. 1'..,, 131s.)

. T 0 all about it may concern:

' Be it known'tha-t I, Anaxa'xnnn citizen of the German Republic, residing zu Berlin, Germany, have invented certain new and useful Improvements in \rc Transmitters for \Vireless 'lelegraphy (for which I. i have filed applications as follows: Germany, Patent No..2$)7,965, filed July 3, 191i; Great Britain, Patent No; 19,331), of which the 10 following is a specification.-- I

It is well known that in sending signals or which undamped oscillations are ,nsed, can be received only by s ecialm'eceivnn dev1ces,,with the result must-also be provided with special devicgs sages from stations equipped with are lump senders.

The present invention avoids all these. difliculties. The invention consists in the use with an arc. lamp of frequency increasing arrangements, which, for example, may

belikc. those heretofore" used with high l'rcqucncy machines, irrcspecti\-'e of whether .the increased frequency is an even or odd multiple. Obviously, only those frequency increasing'ineans can come into consideration which operate with magnetically saturated iron, vi. e., arralwcments such as are described in German atent, No. H9361, for doubling the period, or multiplying arrangements of the type described in German Patent, No. 264,250. In this manner, the international wave length of 600 meters may be produced by generating waves of 1200 to 1800 meters by means of an arc, and doubling or tripling the frequency of these waves by means of static frequency chang- 50 ers.

Together with the multiplying of the frequency, we may affect also the energy sent Meissxnn,

the use of ill'u. lamp transmitters on board'merchant ships,-

tiat each Tship that carrie's'a spark sender,

in its sender to. enable the reception of mes out in a very simple manner, whereby the signals will be audible in an ordinal receiver that is constructed for the receiving of spark signals. This is accomplished by varying the auxiliary magnctizing'of the frequeney changer in aecm'dance with sound signals, e. g., by providing in addition to the two alternating current windings and the normal direct current winding, a fourth winding through which is conducted alterhating current or cut up direct current corresponding to atone'frequeney. From this results a further advantage consisting in that the operation of the key to interrupt or vary this auxiliary alternating current may be eliminated, whereby. the arc lamp will not be disturbed and will continuously operatednring signaling;

Finally, by means of wireless telephony may be easily eifected. All that is necessary is to send instead of alternating currents, microphone currents through the fourth winding of the period transformer.

-, My invention is illustrated by the single figure of the accompanying drawing. a is an'arc lamp generator having a source A of direct current, and I) and 0 are two transformers of the frequency changer. The primary windings (I, e, of both transformers are connected 'in the circuit of the generator, a, condenser f serving for tuning. The secondary windings 5/, ll, of the trans formers are connected with the antenna i. A second frequency increasing device might be provided and serve for delivering the current to the antenna. The auxiliar direct current magnetizing windings lc, are

supplied in the well known manner, from a constant direct current source m. The sound frequency may be produced, e, g., by bothwindings n, 0, which may be led by an alternating currcntot' suitable frequency, or their circuit may comprise also a. microphone for the transmission of speech.

Claims: 1. An arc transmitter for wireless telegraphy and'telephony comprising an antenna, an arcgenerator, and means inter posed between the generator and the ansuch arrangement tenna for producing an even or odd mult ple of the frequencyof the oscillations produced by the generator without damping said oscillations, said means including a. frequency changer having saturated iron cores.

2. In an arc transmitter for wireless telcgrapliy and telephony, aninc generator including apair of electrodes and a sourcr of direct current connected to the electrodes, a. pair ofsaturated iron cores primary windings on said cores, an oscillating circuit including s'aid windings and the arc electrodes, a condenser inseid circuit for tuning the circuit to the fundamental frequency oi the genera-tor and for preventing the passage of direct current from said fiuencing the energy in the secondary win-:l-

ings in accordance with signals to be than nntted. in testimony whereof I alib my n,

I ALEXAK Dial; lvll-llrurli'i-

Images