US1666195A - Duplex telegraph system - Google Patents

Description

April 17, 192s.

1,666,195 A. A. CLOKEY DUPLEX TELEGRAPH SYSTEM Filed May 13, 1927' by. y

6 /l avr/wey.

YParenteel Apr. i7, 1928.Y

fsrarf AILISON A. cLOKEYyOE RUTHERFORD, NEW JERsEaAssIGNO-n To BEL-'Iil TEILEBONE LABORATORIES, IivcOIiieoIiAfrED,v or NEWYon-:regirI- Y, :A CORPORATION OFNVEW "YORK l 'Alipiicatin ined May 13,1927. 'seriai'ivofiegsa yThis invention relatesto telegraphy and `more particularly to a duplex submarine Ytelegraph lcable system employing receivii'ig apparatus'of tlie moving lcoil type.

An object of the invention is to prevent unbalancecurrents, 'due Vto transmitted sigmain and the artificial line, from affecting* A ous other condenser-s in the artiticiallineilthe Y ThisarrangementI`of adjustable resistances" nalimpulses'in a duplexv system in'wliicli there exists imperfect balance' between Vthe the receiving instrument associated with the Y yduplex networkv at the sending station.

In duplex telegraph non-loaded submarine.

I cable systems, resistances are ordinarily inserted at the head. ends of the cable and artificial lin-e and at variousfotlier points along theartificial line7 land adjustable re- .sirstances are usually connected in shunt with the linetlie armature is rot-atedby thelow y frequency` imbalance current andV vtliuefc)n-r ta'ctsaremoved anequal amount in thejsame associated contacts is effected to` cause the' Vcondensers in the ratioarins and With vari-A -adj ustment of which will permit of balai'ics ing theentire systemv quite' accurately for the higher frequency components of vthe signal.

and con'densers doesv not, however, .permit lof i accurately balancing the cable and tl'ievartificia] line for. very low frequencies Vwhich ,may be caused by diiferences between the real and artificial -cables at great distances from the sending end: specific Y'object of tlie'present invention is lto kconiqieiisate in the receiving instrumentV for thiseifectof loW Y frequency imbalance currents Which cannot be removed by adjustment Vof the head end balancing resistances and condensers.

' Accordingto a specific embodiment of the present Ainvention the imbalance lcurrents of low frequencies are renderedineifectiveby providing a relay which neutralizes unbalgance currents and thereby' limits the-opera-Y Vtion of a recording deviceto the received signals only. This relayis'ofthe polarized typeV and is equipped With tWo independently rotatable coils khaving respectively afiixedv l thereto an armature and a'pair of contacts,

the contacts being arranged in engageable l relationwith the armature. One coil is connected to the bridgeV across the yratiolarms marine telegraph station.' ,f

ina bridge duplex systemand is responsive to Vboth received signals wand/the lovv ffreqiie'iicy imbalance currents o f transmitted signals, 'and theother 4coil is connected y Vthrough vaf-suitable ynetwork to .the transmitterfand isA responsive only to currents similarin Wave form and'amplitude tothe low frequency unbalancencurrents liof trans,-A

mitted signals. rThe armature is connected directly to the recording device and thereon-V tacts are connected to opposite `"teriiiina'lsVv of a source'of currentusupply so thatWhen a f receive-d signal causes the armature toje'ii- 'gage either Of'thefassociated contactslan operating circuit for the recording device lis closed. When a'signal is transmitted over.

direction byfa currentequivalent to tlieuii ment between the armature' and eitliferl'ofjfits operation of thefreco'rding device. 'Hofvvevery.`

should 'an incoming.signaljbe` receivedvvhile the armature and'contactsv are under-the con'- Vvtrol Aof a transmitted signahthe curreiityof the incoming signal, depending Aup'i'nrxifts polarity, would cause eitlierwan increasefor decrease'in the movement-of the,l armature f and therebyeft'ect an engagemeiit'or 'disenl gagement WitlioneV ofthe associated contacts ,i

the incoming signal.

This iiiventionwill be 'in to operatetlie vrecording device andrecord "re particularly described in connectionwitli ythe,acfcompany-f bodiment of-tlie invention employedjat 'a terminal station rof* abridge ,duplex sub.

terminatingin a bridge` duplex lsetV in whichy Y ff an artificial `:line 2`is provided for siniiilat'-r ing the impedance Aofthecable.r4 In accord ance with the vpresent.invention the system is assumed to be in perfectL balance for the Y high frequency' components of the signaling currents, vWhich'.k balance Vis obtained byad- Y' l justing resistances 22 laiijdf,237jat the ^head f ends of the cable andftliefartificial'liiiegiref g spectively, resistances '24 'and25 .in the rratio arms and the'impedancefelements?which are 1 'Y employed inthe artificial lineQ. This ball# ance-however does iiot'holdffortheilovv fi quency components of the *signaling'fjcurrents. In this system the recording device -3 which may be any ofthe Well -knovvirtypes7 'y Y will respond not only-.tothe incoming"sig- `nals but also' to the imbalance low, frequency *Y In order .to'compensate for this unbalancci of *Y components of the outgoing ,signal currents.

y nothe low frequency components of the transmitted'signalsand limit the operation of recording device Sto the incoming signals only, relay 4f is provided to control the operi ation of the-recordingdevice by .neutralizing vthe effects of the imbalance currents. This relay is equipped with two coils, namely, signal coil 5 and neutralizing coil' 6 which are arranged when energized7 to rotate independently of each other between the poles of their respectively associated magnets Z and 8. Thecoil 5 is responsive' to either the signals received from cable 1 or the uubalance low frequency components oi the signals transmitted by transmitter 9, and the coil 6 is damped so Vas to be responsive to only the low frequency components oir' the transmitted signals. in armature 10 is fixedA tocoil 5 and contacts 11 and 12 are likewise ViiXed to coil 6, that rotation ot veither coil alone etlects an engagement or disengagement between the armature and one of the contacts, thereby'connecting'or disconnecting the operating circuit ot' recording device 3 with battery 13. it is understood, of course, that the invention is not to be limited to the Yembodiment shown, but

-that other types of relays may be employed,

such as one having fixed coils with two movable armatures one of which carries the lsingle contact and the other carries the pair ot ance current in the circuit of coil. 5.

,In describing the operation oit the system, let vit be assumed that incoming Vsignals are `beingreceived from cable 1. The signals passthrough network '14, amplifier 15 and coil 5.y -Coil 5 rotates and moves its armature to one side or the other depending upon the polarity of the incomingv signals, to connect one pole ot battery 13 to t-he recording device 3 which operates. toinake a record ot the incoming signals. When a message is being transmitted from transmit-ter 9, the current vof the outgoing signals divides at point 18, part going to the apex 19 and the other'part passing through `the circuit .of resistance 16, network 17 and coil 6. AInasinuch as this invention is concerned 'principally' inthe imbalance of the able nals, the cable and artificial line are regarded as being in nearly perfectV balance for the higher frequency components of the signaling currents so that the higher frequency components are ineffective vto operate either of the coils.

19 are balancedv outby the resistances 22, 23, 24, 25 and artificial lino 2 and thosetransmitted to coil 6 are rendered ineffective by in series, thereby causing the armature 1()v to rotate to one side or the other, depending The higher fre-- quency components transmitted to the `apex se l upon the polarity of the outgoing signal.

Simultaneously with the tlow ot 'imbalance current through coil the current'similar in wave orm'and oi' approximately the same amplitude causes the contacts 11 and.

12 to `rotate vin a similar manner and inasmuch as these coils are so connected that? thev contacts move in the same direction as the armature, no relative movement between the armature and contacts results Vfrom the imbalance current and no record is, theretore, made by the recording device. Y

Should signals be received during the v time that transmitter'Q is sending amessage over cable 1, the current ot' the incoming signal would be added in coily 5 to that olf the imbalance current -flowing therein at the time, and if the currents happen to be of opposite polarities, the movement-,ot the armature 10 would be decreased and 'it ol the same polarity the movement would be in'- creased, so that regardless ot what the polaritiesof the outgoing and incoming signals may be, a relative motion vtakes place between the armature and the contacts to record the nature ot the incomingsigual.

The invention has been described above as applicable to ordinary duplex telegraph and non-loaded cable systems. However, it can also be employed with loadedk lines and cables or elsewhere wherever the need exists for means for accomplishing the function ot the invention.r y Y lWhat is claimed is: Y

1. duplex system terminal arrangement comprising a main and an artificial line, a source oi current for transmitting signals, a translating device responsive to incoming signals, and means for neutralizing disturbing e'ectsdue to importent lbalance between the main and artiiicial lines, said means including independently movable members arranged to move simultaneously in the same direction in response to outgoing signals and i the imbalance currents producedthereby, .so :is to prevent relative movement `therebetween and the subsequent operation ot-said translating device. i i* Q. Ina telegraphppsystem, a terminal duplex bridge arrangement comprising a main* and an artificial line, a lcontact making device having operable contacts, a signal tr`anslatingidevice responsive to the operation A,of

said contacts, and separatel means for operating said contacts simultaneously to pre# I vent theoperation of saidgtranslating device in response to outgoing signals and to effect the operation f said translating device by 1 the incomina signals lWhen' signals are being l v D i n simultaneously transmitted.

3. In a telegraph system, a 'duplex bridge arrangementcoinprising a main andan artificial line, a contact making device comprising a plurality of coils each of which is arianged to be energized without vintei'ffering iiiagnetically'ivith the other, and movable y k,contacts on each of said 'coils arrangedtov move in the same direction in respons'eto outgoing` signals and imbalance currents produced thereby, ,to prevent engagement 1 between said. contacts, 1.

4. In a telegraph system, a duplexbridge arrangement comprising a main and an arti`- iicial line inimperfect balance for the low frequency components of the signaling cur-7 rents but in substantially perfect balance 'for the higher frequency components, trans' initting means, a signal traiislating device, a

contact making device comprising a sigv` nal receiving coil and a disturbance neu'- tralizing coil, movable contacts iony 'peach i of said coilsV arranged when interengaged to operate said recording device, and means 'foi-.Y diverting a part ofthe transmittedV signal current through vsaid dis,-

1 turbance neutralizing coil at thesame time Lior that the disturbing current dueto the im' perfect balance is flowing through the sig-` nal lreceiving'coil to move said contacts in Athe saine direction thereby preventing" the" interengagement of said contacts and the Voperation of said translating device in response to low frequency imbalance currents vresulting from the transmitted signals.

i 5. In a telegraph system, a .duplex bridge arrangement comprising a main and an artil fficia'l li'ne in imperfect balance forthe low yfrequency components ofthe signaling currents but' in substantially perfect balance" for the higher frequency components, a

transmitting mechanism, a signal translating device, a contact making device for conf p trolling said translating device, a signal receivinfcoil on saidl contactin'akino device arrangedto be effectively energized by both the received signalsxand the imbalance cui-- rents of the transmitted signals, contacts on said coil arrangedlto be operated in either.

7 direction by said signals, thev direction depending upon the polarity of the signal, a

i disturbance neutralizingV coil-onv said contact making device arranged to be effectively energized. by, only the loW frequency coniponents of .theoutgoing signaling currents, and contacts on said neutralizing coil v arranged to move in a direction `corresponding'Y to that of the'contact-s onsaid receivingcoil when thelatter coil is energizedv by the unbalance currents only,` thereby preventingA linterengageinent of said contacts and' neu-` tralizing the effect ofther imbalance currents produced in said receiving'coilL" Y 6. In a telegraph system, a duplex bridge' naling currents vand inVA substantially' perfect balance for the higher' frequency ,composo; 1 i

nents, transmitting means, a signaltransr,A

lating device, a contactinaking device com#4 prising a signal receiving coil-anda disturb ance. vneutralizing ycoil magnetically inde'- pendentl of eachother, movable contacts on ari"A each of saidv coils arranged When interenjfw going signaling currents whereby' relative movement of said' contacts if prevented,`

means for preventing the operationv of said coils in-response lto the higher frequency components of the outgoing signalY currents, Y'

and means for energizing the receiving coil rgaged', to` operatesaid translating device',4 Y means for opeifatinglboth'lvcoils in response tothe low` frequency components ofthe out- Vonly in response to incoming` signals Where-- by said contacts interengage to operatesaid y translating device.

f arrangement comprising a main-and an, arti 'iicial line'in imperfect*balancevkfor the low frequencycomponents of the outgoing sg-Ll naling currents and in substantiallyperfect balance for -fthe higher `frequency compo?4 v' nents, transmitting means, a' recordingde Y device, a contact making device comprising a signal receiving coil and. aiheavily damped disturbance neutralizing coil,"v movable con-V tacts onfeach of said coils arranged to interengageto operate said recording device,

inea'nsfor operatingl both coils in response to the 10W' frequency components of Vout- 't going signalv currents whereby relative movement Vof said contacts is prevented, im-y pedance elements in the Aartificial line andY iicial' line for-cooperating With said damped InV a vtelegraph system, alduplexA bridge i j i175 'l Ithe head ends ofsaid cable land said', arti-' y` neutralizing coil* iii preventing the opera-,1r

tion of said contact making device in response" tothe higher frequency components ofthe Y outgoing signaling currents, and .means for energizing-the receiving coil only inre-` sponseto incoming signals whereby said contacts interengage 'to operate said reco-rding device.

ii'iyinaine this l2 day of `May` A. D., 1927.v

`ALLisoiv kA. cLoKEY.

t 12: A In Witnessr` whereof, I hereunto subscribe I

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