US1881758A - Two-channel fork-controlled receiving and repeating apparatus for telegraph systems - Google Patents

Description

Oct. 1l, 1932. H. A. LONGLAND TWO*CHANNEL FORK CONTROLLED RECEIVING AND REPEATING APPARATUS FOR TELEGRAPH SYSTEMS Filed Aug. 13, 1931 Hl AN IY. agg/c2125) Patented Oct. 11, 1932 UNrTED STATES PATENT OFFICE HERBERT A. LONGLAND, OE VALENTIA, IRELAND, AssIGNOR To THE WESTERN UNION TELEsRArHr COMPANY, OE NEW YORK, N. Y.,A CORPORATION or NEW YORK Two-ORANNEL EoRK-OONTROLLRD RECEWTNG AND REPEATING APPARATUS POR y f TELEGRAPR SYSTEMS Application led August 13, 1931. Serial No. 556,879.

This invention relates to telegraph systems which are adapted to high speed transmission and wherein thereceiving and retransmitting apparatus are free from complicated mechanism such as rotary distributors which must be maintained in synchronism at the differentvstations and in which the regenerated signals Vare sharply defined and accurate.

One of the objects of my invention is to provide a receiver and transmitter for synchronous telegraph systems for separating interwoven impulses vof two channels into separate channels and to'reassemble the regenerated signals into their Original interwoven arrangement and repeat them into a single cable or line.I

My invention will y be clearly understood and may readily bel carried into eifect from the following description in which I shall refer to the accompanying drawing whereyFigure l is a diagrammatic illustration of the apparatus and circuits embodying my invention;

VFigures l.EL and 1b "represent respectively Vthe segregated impulses of the A and B channels;

Figure lc represents the combined twochannel impulses received over the incoming cable; and

Figure ld represents the combined impulses ofthe two channels repeated into the Outgoing line or cable. 1

The impulses of the code combinations of the two channels which are combinedr or interwoven atv the transmitting station and Y sent over the cable 2 are arranged in alternation. I have shown for the purpose of illustration, in Fig. 1i the letter S of the A channel combined or interwoven with the impulses of the letter O of the B channel.

IThe tuningfork 5` is preferably arranged to. vibrate at the same frequency as the fundamental line frequency. However, it will Vbe evident to engineers that the tuning fork may be arranged to vibrate at a multiple of lthe fundamental line frequency to accomplish the result disclosed in this invention. The vibrations of the fork are maintained by the pullV exerted by the kfork magnetkFM each time the tine 5b engages the contact 4. The fork is adjusted to vibrate at a rate slightly faster than the signaling frequency and a braking or retarding action is periodically applied through the magnet FM by the operation of the correction circuit shown on the right hand side of the tuning fork, as described in patent to Angel & Robinson No. 1,804,302. f

Assuming that the fork is vibratin in synchronism with the distant transmitter or transmitters and that it is being properly corrected or maintained in synchronism by means of the correction circuit, the tine 5a engages contact 6, thereby operating switching relays R2 and R3 and the pick-up relays RL and R5 to their marking contacts through a circuit from minus battery, t-ine 5a, contact @windings of relays R2, R3, R4 and R5 to plus battery. v

With the relays in this position, the first dot impulse or element of thefSO combination is received over the cable 2, causing the dot relay R to move its tongue to marking Contact, the tongue of the dash relay R1 remaining upon its spacing contact. Negative current, therefore flows from minus battery over the tongue and marking contact of relay R, conductor 10, marking contact and tongue of the signaling pick-up relay R5 to condenser K1 and ground, thereby placing a negative charge on the condenser. Then the fork tine 5a leaves Contact 6, the tongues of the pick-up relays R4 and R5 are moved to their spacing contacts under the influence cf current constantly flowing through their biasing windings. The negative charge in condenser K1 then discharges through the tongue and spacing contact of relay R5, through conductor 12, the upper windings of the two-channel relays R10 and R11, conductor 18, tongue and marking contact of switching relay R2, conductor 1A and upper windings of the A channel relays R6 and R7 to ground. As these relays are connected in opposite directions, only the dot relaysR6 and R10 will have their tongues moved to their marking contacts to thereby transmit the irst dot element of the character S to the A channel repeater and recorder as indicated `10 relays'RQ- andn R3 to ymove to their spacing contactsand the tongues'of pick-up relays R1"and R5 to'inove to their inarlingv Contacts. The second impulse or dash element offthe two-channel combination shown Fig. 1C isnow received over the cable 2, this being the irst v,element of the character O. This causes the tongue of the cable dash relay R1 to ,operate its tongue over tothe marking contact, thel tongue of the `dot relay R remaining against its spacing contact.y circuit lis thus closed from positive battery through the tongue and marking Contact of dashmelay R1-o`ver conductorlO', marking lcontact and tongue of signaling pick-uprelay R5 through condenser K1 to ground, thereby placing a positivecharge on the condenser. 1When the forli tine 5? leaves contact 7 the tongueof pick-up relay R5 moves to its spacr vingcontact under fthe'control of its upper biasing. winding as previously described;

The positive charge on the condenser K1 discharges .Y over a` circuit through thetongue and spacingV contact. of relay R5, Lconductor 12, upper windings .of the channelrelays R10r and R11, conductor 13, tonguek and spacingcontact of switching relay R2, conductor 17:.and upper operating 'windings of the B channel relays Rsi and R9 to return or ground. Since these relays are connected in opposite .Qdirections', onlythe ,dashV relays R?y and R11V are.` operated to their marking` contacts and thereby 'transmit the first dash elementof the character. O, as indicated in Figs.l 1b,

aand 11. l Y

,If have thus traced the reception' of the first, two elementsof the combined orinterwoven elements of the code characters S and O transmitted and received over the cable-'2. Thereception and translation of the third-, fourth, iith and. sixth elements of the signal combination shown in Fig. lC are brought about in a manner similar to that just described, as will be clearly evident.

The reception and translation voft-.the zero or spacing signals which follow the code characterswill now be described. At the termination of the last element of the character O, vthe fork tinev 5,1 is in engagement with contact 6, thereby Ycausing they tongues of switching relays R2 and R3 and pick-up relays R1' and R5 to engage their markingfcontacts. Atthisinstant the tongues of the cable relays R and R1 engz'ige'l their spacing contacts underthe iniiuenc'e of their lower biasing windings, Inasmuch asno signal or zerofsignal Leslies .Zero elements in the recorders of the A channel and B channel relays respectively and in the two-.channel relays .R1D V,and R11- vVith the cable relays R and R1 ontheir spacing contacts, the spacingpickfup con-` Y denser .Kgis charged with positive current over a circuit from plus battery throughthe tonguean'd'spacing contact of relay R1, conductor 18, marking contact and tongue Vof spacing pick-up relay R4, condenser K2', conductor 19, spacing contact and tongue of re-Y lay R1. toy minus battery.y c

When the forli tine 51 leaves contact 6, the tongue of spacing pick-up relay Rt moves to its spacing contact under the 'influence of the current constantly flowing through its Lipper biasing winding. The positive charge on the condenser K2 then discharges over the tongue and spacing contact of relay R4, conductor 20, they lower windings of the twochannel relays R1o andv R11, conductor 21, tongue and. markingl contact of lspacing switching relay R1, conductor 23, loweror spacing windings of the A channel relays R6 and R7 to positive battery. These four relays move their tongues to their left `hand spacing contacts, thereby transmitting the space element for thelcharacter S shown. in Figs-'1231 and 111, i' f yThe spacing element of the character Ol is produced in a Vvsimilar 'manner after the fork tine engages. its inner contact?, there# by causing the tonguesof the switchingy relays R1 and Rato engage theirspacing contacts. Hence the discharge from; the condenser K2 is diverted through the conductor 25 into the lower or spacingv windings-.of `the B channel relaysRS andiRf; These relays and the two-channel relays R10' andi' R11 transmit the spacing` element of the character O into the recorderand#y to the riepeater of the B channel. and intothetwochannel outgoingcable: 15,- asxindicate'd. in Figs. 1b and '111.VK l vi y l 'have thusl explained how the organization disclosed herein: segregatesthe interwoven.L elements of the combined' code characters and transmits the yregenerated code characters Vinto separate channels andrsimultaneously reassenib'les* the regenerated'.V elements of the code characters into the original interwoven* two-channelV combination which is repeated or retransmitted 'into the outgoing line or cable.

I claim: Y, Y c 1.111 atelegraphsystem, receivinglineans responsive to combinations comprised of in-V terwov'en selectingy impulses offcode characters from a plurality of channels, separate repeaters for the characters of the respective channels, means for segregating the impulses Vof the respective characters and transmitting them in regenerated form to said re-` peaters and a vibratory timing member con#- trolling said segregation.

v12: In a telegraph system' as defined iii claim l, additional means under the control of said vibratory member for retransmitting into aline or cable regenerated conrbination's arranged in the same orderI as they were received by said receiving means;

3. Ina telegraphsystem, receiving means responsive to combinations of selecting cox`i= ditlons, means for segregatingfsaid select= ing conditions into groups representing char= acter code combinations and transmitting corresponding regenerated code combina; tions of selecting conditions into separate channels Vand a vibratory timing member operating between contactsto control said segregation, said regeneratedv selecting conditions being transmitted while said vibratory member is in non-contacting position.

4.' In a telegraph system, receiving means responsive to selecting impulses, a repeater comprising Ameans for storing the impulses successively received by. said receiving means, separate means' for transmitting regenerated impulses corresponding to said stored impulses into separate channels, switching means for determining which channel shall receive the respective impulses,

and a vibratory timing member for controlling the operation of said switching member.

5. In a telegraph system,vreceiv1ng means responsive to intermingled selecting impulses from a two-channel source, means for segregating said impulses into groups representing code combinations of characters, means for transmitting said segregated groups into separate channels, switching means for determining the channel for the respective groups, and a vibratory timing member controlling the operation of said switching means.

In testimony whereof, I aihx my signature.

HERBERT A. LONGLAND.

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