USRE14760E - Leonard p - Google Patents

Description

. of the closed circuit form of my invention." Fig. 4 is a diagrammatic representation 'new and use STATES PATENT FF LEONARD F. FULLER, OF PALO ALTO, CALIFORNIA, ASSIGNOB TO FEDERAL TELEGRAPH COMPANY, OF SAN FRANCISCO, CALIFOBN IA, A CORPORATION OF CALIFORNIA.

-. WIRELESS rnLEGnarnY.

Specification of Beiss ued Letters fatent. Reissued Nov 25, 1919.

Original 80.1,179358, dated April 11, 1916,-Ser1al No. 762,475, filed April 21, 1913. Application for reissue fled October 30, 1918. Serial N9- 128,406.

- Toal lwhomitmay concern. I

. Be it known that I, LnoNAnn F. Forum,

a citizen of the United States,'and a resident of Palo'Alto, county of Santa Clara, State of California, have invented certain 1 ful Improvements in Wireless aphy, of which the following is a Telegr specification.

The invention relates to improvements in wireless telegra by -and especially to proveinents in't e transmitting circuit.

The object of the invention 1s obtaina higherantenna .current with a given input than has been heretofore-obtained.

Another object of the invention is to re- ,duce-the resistance of-the antenna circuit,-

thereby increasing {the antenna current.

Another ob'ect ofthe-invention is to provide means or, obtaining sharper tuning thanhas been heretofore practical.

-The invention ossesses other advantageous features, ,w 'ch, with the foregoing will be set forth at length in the following description where I shall outline in full that form of the-invention which I have selected .I may adopt many variations of the said invention as expressed n said claims.

I Referring tosaid drawings:

. -Figure 1 is'a diagrammatic representa tion' of one form' of t e transmitting circuit of my invention. I v vFig. 2 is a diagrammatic representation of a: modified .form of the circuit.

Fig. 3 is a diagrammatic representation of another modified form of thecircuit} In wireless telegraphy transmitting circuits, a certain amount of energy 1s not radiated'because of the PR losses of the source of oscillations. For a given input, a much smaller amount of power is produced in the antenna. By the use of my invention these IR losses are greatly reduced and the owing *maiy be omitted.

resistance of the antennacircuit is reduced,

ductor 5. Connected to the other side of the arc is a'conductor 6 connected to the antenna? 7 and including in circuit in series a capac fity, preferably in the form of a variablecondenser 8 and. a variable inductance 9.

Sh unted around the variable condenser 8 and the'arc 2- is afcircuit} 11 containing a centage of the total antenna-- current will;

ass through the shunt circuit and the IR osses of the are .are accordingly reduced.

The'capac ities of-the condensers to be employed depend upon the capacity of the antenna an onthe conditions 0 operation,

capacity, preferably in the'form ofa vari and are so adjusted to obtain the desired result. -The shunt circuit is in no wise a circuit tuned .to the antenna frequency, as its natural frequency of oscillation is usually of a hi her value.- In certain instances the value 0 condenser 8 approaches and reaches infinity and in thosecases the condenser 8 t is an important feature of this invention that the inductance and resistance of the shunt circuit'll: be kept a minimum, as otherwise thecirculatingcurrents throu h it will not be wattless, as is desired, but Wlll have a power factor of appreciable value. In a circuit in which the arc is more or less unstableand'inclined to set up several irregusing 9. -K; W. are, and maintaining the capacities of the antenna and both condensers equal, I have obtained an-increase of50% in the antenna current, over thesystern in which the antennacurrent passed en-.

' increase in the antenna current.

tirely through the arc. Using the same installation and doublini'the capacity ofthe condenser 12, I have 0 tained 100 per cent.

pacity of the condenser '12, however, has a certam maximum critical value above which. 'it fails to aid inboosting the antenna. cur.-

rent. Using a '50 K. W. are I have obtained an increase m'antenna power of 74 per cent. over the system in which the total antenna current passed through the arc. The efiiciency o the system .has been further increased by about 11 per c ent., when the 50 cult is inductivel K. W. are was in use, by means of the circuits shown in Fig. 2 in which a circuit 13 containing resistance 14, preferably variable, and an inductance 15, preferably 'va-i riable, is shuntedaround the condenser 8.

If this circuit be tuned nearly into resonance wi h the oscillations the main antenna it wil have a very high reactive voltage dro across it and will, therefore, "force a sti lter per cent. of the antenna current t rou h the shunt circuit 11.

' It s ould be'noted that the circuit'shownin Fig. 1 raises the antenna power reducing the resistance of'the antennacircult while the circuits shown in Fig. 2' increase the .a ntenna power bygreatly reducing the energy losses in the arc.

The modification shown in Fig. 3 ope'r atesin the same manner as thatshown in Fig.1 2, with the exception that the arc circircuit through t 'e transformer 16, preferably variable, instead of being directly con= nected thereto; In this system a condenser '18 must be inserted in closed circuit, to produce the capacity ,efl'ect of the antenna in the open circuits.

aling may be accomplished by Vargoft e 'in t e frequency or the wave len h ra iated oscillations, by varying the inductance in circuit. 7 In the resent instance I have shown a key circuit 17 adaptedto .shunt one or more turns of the inductance ing inductance in series in said system, and

a substantially inductionless circuit 0on 'taining a capacity continuously shuntin said first-named capacity and the source'o oscillations.

2. In a transmission system for wireless telegraphy, a source of electrical oscillations, 0. radiating system associated there- The ca- 7 connected to the antenna with, a ca acityin series with said source, 05

and a su stantiall containing a capac ty continuously. shunt-.

inductionle circuit ing said first-named capacity and said I source.

' 3. In a transmission system for wireless telegraphy, a source of electrical! oscilla tions, 9. radiating system associated there-' 'with,--an inductance and capacity} in serles Wlth said source, a capacit continuously in shunt onsaid source and 'st named 'ca acnamed capacity. p I 4. In a transmission system for wireless telegraphy, .a source of electrical oscilla-f tions, a radiatin system connected thereto,

1.75 lty, and aninductance 1n shunt on said r'sta capacity and 1nductance in said system, a circuit containing capacity continuously shunting said source and. first-named. ca-

inductance pacity, and a circuit 'containin and resistance in shunt on sea first-named capacity.

5. Ina transmission system for'wireless telegraphy, an are, a radlating system asso-' ciated therewith, a capacity and inductance 1n serles in said system, 'a circuit containing capacity'continuously shunted around said are and the'first-named capacity, and. a circuit containing resistance and inductance shunted around said first-named capacity.

6. In a transmission system for wireless telegraphy, .a sourcefof electrical goscillations, a radiating system associated therewith, an inductance and capacity in series with said source, and a circuit shunted on said capacity and source, the impedance of said shunt circuit bein lessthan the impedance offthe circuit s unted,

' 7. In a transmission system for wireless telegraphy, a source of electrical (iscilla- .tions, a radiating system associated there-. with, an inductance and capacity in'series' with said source, a clrcuit contaming 'capacity in shunt on said source and firstnamed capacity, and a circuit containin "resistance and inductance. shunted aroun said first-named capacity, the last shunt circuit being nearly in resonance with the oscillations in the radiating system.

' 8'.- In a transmission system for wireless telegraphy, a radiating system, a source of electrical oscillations, a capacity and inductance in series in said system, a substan-.

tially inductionless circuit containing acapacity continuously shunting said. .firstnamed capacity and source of oscillations and means for yaryi'ng said inductance.

9. In a transmission system for wireless itelegraphfyg, a source of electrical'oscillations of high quency, a conductor connecting one side of the source to earth, a radiating system connected to the other side of said source, and a substantially inductionless circuit containing capacity, continuously shunting said source andservin to roduce a low resistance return circuit or t e electrical oscillations from the radiating system.

10. In a transmission system for wireless telegraphy, an electric are for producing electrical oscillations of high frequency, a conductor connecting one side of the arc to Y earth, aradiating'system connected tothe other side of the arc and a substantially inductionless circuit containing capacity and 10 having less impedance than the arc continuousl shuntmg said arc for the purpose of boosting the radiating system-current by shunting a portion of said current around the arc to earth, and thus decreasing the 15 energy losses in the arc.

LEONARD F. FULLER.

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