US1220072A - Method of wireless signaling. - Google Patents

Description

APPLICATION FILED NOV. I3| I915.

Patented Mai: 20, 1917.

LOVES COHEN, OF WASHINGTOIiT, DISTRICT COLUZMBIA.

:METHOD OF WIRELESS SIGE E'ALING.-

man-mum arm To all whom it WW /rowers.-

Be it known thatl, LOUIS .COHEN, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain new and useful improvements in. Methods of lVireless Signaling, of which the following is a specification.

This invention relates to a new and unproved method of interrupting the current in a high. frequency oscillatory circuit for wireless signaling purposes, and is particularly applicable to the arc-systen1 of Wire less signaling.

The present invention has for its primary object an important and practical improvement in the method of radio sigual-.

ing by the are system. The method now generally used in signaling by 'the arc system consists in the use of the so-called compensation wave method. In, that method there is current flowing in the antenna circuit and energy radiated all thetime, but the Wave length is changed in signaling, that is, for dots and dashes energy is radiatcd at a definite wave length, say six thousand meters, for instance, and for the spaces between dots and dashes energy 18 radiated at a slightly different wave length,

say fifty-eight hundred meters. lhe objection to this compensation Wave paethod is that the energy is radiated all therthne, and at two different frequencies for two diderent intervals, which is at times confusing tothe operator. Furthermore, when hum her of stations; are in operation, and each station is radiating energy at two different frequencies, the trouble from interference is greatly increased.

' In contradistinction to the compensation wave method referred to, the present invention provides novel and practical means whereby signaling by the are system can be accomplished lay-using one wave length only. That is, according to the present invention, energy Wlll be radiated on dots and qdashes, but no radiation ot energy at all occurs on spaces. In other words, the pres-- ent invention provides a means whereby the current how in the antenna circuit may be placed under such control tliatit can be varied from zero to maximum, without in troducing any appreciable sparking, and without affecting the operation of the arc.

The preferable embodiment of the inven- S pecification of Letters Patent I Patented Mar. 20, 1917.

Application filed 1i? ovember 13, 1915. $c1ia1 No. 61,332.

tion of this application is shown in the accompanying drawing, in which-,

The figure is a diagram of aw'ireless signaling system containing the invention.

'llhe essential features of the improved method of radio signaling by the arc system may readily be explained in connection with the diagram shown in the. drawin s, wherein the numeral 1 is an antenna, 2 and 2 inductance coils, 3 an are excited from the usual direct current source g, l, P, d ground connections, 5, 5 fixed condensers, 6, 6 electrodes, 7 an electrolytic solution, 8 a container, 9, 9* leads, and 10 an electrode operating device of any suitable mechani- Bill or electrical type. The operation is as follows:

When the two electrodes '6 and 6 are brought close together, two complete circuits are formed to which the arc can supply energy; one is a loop circuit consisting of are 3, lead 9, inductance coil 2, condenser 5 lead 9 which connects to electrodes 6, 6 and grounds 4., 4t. The other is the antenna circuitconsisting of antenna 1, inductance coil 2, lead 9., arc 3, and ground 4'. Since the loop circuit is o smaller resistance than the antenna circuit for the reason that it is a closed circuit and there is no radiation, and also because the inductance inay be made relatively small, nearly allthe current will flow in theloop circuit, and very little, if any, current will pass into the antenna circuit. In fact, by a suitable'adjustment of the inductance 2 and capacity 5 of the loop circuit, a, condition can be realized of having absolutely no current in the antenna circuit when the electrodes 6 and 6' are brought close together. When the electrodes 6 and, 6* are separated, a re sistance is gradually introduced into the loop circuit which reduces the current in that circuit to a very small fraction, 1% or less, and all the energy from the arc is takenup by the antenna circuit, a large'curs rent flowing in antenna circuit. The operation is, of course, obvious; by operating'the movable electrode 6, the oscillatory current from the arc can be made to flow either in the loop circuit or antenna circuit depending whether the electrodes are close together J0 or separated from each other. In this way,

the current in the antenna circuit canfjbe For wireless signaling, the actual operation quires a certain length of time which may he \vouidhemto scparatc the flli ctt fldcsi g -tnd relat y l r wcpr; SI i L; a

. v 5;, v.1, i g ior tht (iota angl dpr hes. :rngi r11 JQII trtn to ffifi 5 dashes. The lixctl q gn d U x I A v 'scprcfcx 'ahly the (raw, if 70 purpoae in this cascnfi'rct we n t 'th' v tnser 5 0f the absorptlmi stt-nttY. rcz iit l argerthan the condenser or antenna k I l of the antenna circuit, and at the same time in thelm circuit. I n'etcrab 1@, but inaigetheitime constant. of the ':\l)sQ1 'piq1 1eiry 1O ndt Jilitft.SETPYfHr'titQ mp1 ration of the in cuit smallcr'than the time constant cf the 7r rcntimr. an suitahie \'ar iz\j:reSi'stanccir'iil aim-miirm|-it=, -t1wna condition can he uhserve the purpose. I, tained where the potential of the eundensen L FO:LiHHiLVSLfiTIk k the pririci iiwin vplved in inthc circnit wlini' e*itiine ctiiisianti" sn taTP' this invcntimr' itisncrcssarFtti 1m iiciieltith Ui' ak-dininjxiti'hi fifiij tn; 't-heiappiicant's theory nf the Qniienscrin thkiothetMire! arc phennmeua' which is as tci h 'w I ny appreciable degrc Th hgr'tlie uiieratitiurut an arr em ihe' arc is mimysi functioning 'n'ffnty -:5; chgvtrmics 3) a i'cihi ml ijht int! minimum the ownehktant ijf'theiahs't unigi-ietinut thdicelrci r ii i-ireu'i H f/current; titiwi 5 [tut-tail h :thetgencra cunt OT:UlGCU'UlHflQHZt cenergyu ht in min-e cnih: ch cisao'fi cunsidc ahle mag flex ietitrtniel i MK aintiztiisn; up utejeotl tiie a t i jutwncit, elect nlzicnclzgj stun (iuyian, sui'g'efiii'intugztziu q the 1 same. tim nheiiif th v 1 1 I is matlc small thenenlarge(oscillatory;cuter; i rcuits shuntcd rent; 11111) hexleuelopcd in "it, while there is wrhmyn;inthc no currentflowin the:imtmmatircuiti Iii I I ('QHtiiiClltiHg hopvevertthemlectl'fidQfiaax e;upiimed ilrlui'gtia f3, '53,flifl t ql e resistance,js thtwiritrtittneed intb theabsoppit that whenhuth ciration circuit, and the cugrant distrib ntiomisill5 9c n1ing x i al d, -fl t i mi lhtwe :11: mifrcnt- {19min the antenna circuit hmipnn cunw 0t t nt J51 the aslise p iwi :I?,i-'- @Mmfurej} ng, (an i qpcning; the elect eggs (Gk- 6 Qt; gtart (Iii-rentflmvgiinthedlzo cnitiyh ich" nn-he giitilimtl join it icctrq current will exist in one circuit and substam tmlly none-in the other circuit.

2. .\n are system for radlo signaling comprising an antenna, circuit and anyzibsorption r'ireuit lmth. in parallel and. shunte'd across the are. and menus for adjusting the electrical time constants of the two circuits in relutiun to each other 150 that when both cirvuits'urerlcsell simultaneouslyand the arc i. in nperuticn, there is an uscilluti'n'y current lion in lihe;absorption rircuit and sub in the antenna 'electriml time constant, and thus wiry the zuncunl; of currentflow n the antenna cn cuit.

" 4. An are system for nulie signaling eenr prising an antenna rireuiti and un uhsurp; ticn circuit in parallel mthit, and an electrolytic means 01 \uiviu gthe resistance el the absorption circuitl'n thereby vary it;

electrical time ecnlstant :llillthus vary the amount of curren v lluw in the :um'nuu ir-- Quit.v A i In testimony wliereul' ,l hereunto ulliX my signature in the presence oi [we \rilm-sses.

LOUIS COHEN.

Y men-$05:

l). L. (inn-r, JA Mics lli .huu'.

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