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Nov. 12, 1946. B. J. HENDERSON I 7 SELECTIVESIGNAL RECEIVING CIRCUIT I Filed May 30, 1944 ' 2,411,091 2 Sheets-Sheet 1 176. /. RECE/VER OUTPUT 70 (‘ALL BELL .TRANSHNWER ' , sw/rzlm's GAL“... Nov. 12, 1946. _B. J. HENDERSON SELECTIVE SIGNAL RECEIVING CIRCUIT Filed May 30, 1944 2,411,091 2 Sheéts-Sheet 2 Patented Nov. 12,_ 1946 2,411,091 . ‘ ~ UNITE-D i-"STATE-S PATENT oF‘Fic-E “ Y 2,411,091 SELECTIVE ‘SIGNAL RECEIVING "CIRCUIT Bryan Jam-es Henderson, London, England, as signorof one-half to John GJMur‘do'ck &‘Com ,pany Limited, London, England, a company‘of “the "United ‘Kingdom of Great Britain and _ Northern ‘Ireland ‘ Application May 30, 1944, Serial No. 538,003 In Great Britain May 24, 1943 3 Claims. , l 'The object of the .present invention is toeenable .aradio line .or other signal receiving station to be called'by number, call-sign, or code, and to signal the fact of the call, in the same manner as with wired automatic telephone systems, even though the receiver is not ‘in operation at the time, at 'the same time indicating to the caller, by means of a return signal that the receiving apparatus is being called. (Cl. 177-353) 12 . ‘ ‘The apparatus is responsive to trains ‘of im pulses at measured intervals for ‘each letter or ?gure of the code, and to this end employs in known manner the hatching-magnet-operated relay S via conductors >8 ‘and 6, the ‘contacts is] and ‘S2 of which change over the circuits to "-rélay C from contact L1 “so that itherea‘fter‘the trai-nof impulses retains ‘relay 0 closed on the ‘return strokes of contact Ll. ‘ The ‘opening ‘of contact "S'l causes "relay (3 to drop out and thereby open switch magnet-circuit at CI to prevent burning‘out of the magnet ‘if a continuously received signal ‘causes-relay ‘L to remain closed. Relay‘ C-could‘not, therefore, be ‘held closed at all by the intermittent closing of contacts Ll except for the alternative ‘circuit provided for closureon the ‘return strokes ‘of-con wiperswitches of automatic telephone exchanges. A further object of the invention, theretore, is to 15 Winding ‘a of relay F is connected‘to that con provide against .false operation from interference tact on section 2 ‘of wiper switch SWI “correspond and other influences to which radio receiving ap-. tact L'l . paratus is subject, and ‘the invention consists in the circuit arrangements employed 'to this end. ‘These are "illustrated in the accompanying draw ings, wherein Fig. 1 is a circuit diagram-cf signal recording apparatusaccording to the invention, Fig. 2 is‘ a‘ circuit diagram of a modi?cation of a ‘part of ‘Fig. 1, and Fig. 3a further modi?cation to to be used in conjunction with Figs. 1 and 2. Con .tacts are shown in the normal, or rest, position. ‘To make a call trains of impulses correspond ing to the code are‘initiated at a transmitter by means ‘equivalent to the dialling apparatus of au tomatic ‘telephones. The output of such trans mitter consists of trains of impulses in corre— spondence with‘those of the call. ‘These are ap plied to the terminals CA (Fig. 1) whereby the sensitive relay R is operated intermittently in cor respondence with the impulses. This relay is preferably adjustable in respect of its sensitivity. _ . . ing to the first letter or ?gure of the code, and when the corresponding number of ‘impuls'es'has been received, vthe wiper switch will come to rest on this contact. 'On the ‘cessation of the train of impulses, relay A drops out and its .contactAl completes the circuit through ‘the wiper ‘of sec tion 2 of wiper switch ‘SW1. As‘relay B has de layed opening, contact B1 "in the said circuit re . mains closed for a su?icient time after contact Al has released relay B to enable a current'im pulse through the wiper to operate relay F. Con tact Fl 01’ relay'F closes the operating circuit ‘of delayed action or time-limit relay THA via ‘con ductor 9, contact Z2, conductors l0 and. II, and contact Zl, and contact F2 closes a circuit "for holding winding b of relayF, this circuit passing via conductors l2 and I3 and contacts W|,‘THAI and Z1 . Opening of relay B after a current impulse has been sent through contact Bl causes the latter The‘ closing of the single contact RI on this relay contact to connect the supply of current to the operates the heavier duty relay L, the contact Ll wiper of section I of the switch SWI. This sec of which closes a circuit for relay A via conductor tion is provided with a continuous semi-circular 3 to negative main and a‘circuit in parallel there-' 40 contact engaged by the wiper in all positions ex to 'for relay 0 via conductor 4 and contact SI. cept the rest position. Alternatively, a section of Contact L2 of relay L operates the magnet of separate contacts all connected may be used, pro wiper or selector switch SW1 via conductors 5 vided the wiper is arranged so that it must always and 6 when the contact CI of relay 0 has been touch at least two at a time. In the rest position closed. Relay C is shrouded for slow release, and ' “therefore ‘remains closed throughout the train of impulses. Relay A is also ‘shrouded and remains closed, its contact A closing the delayed-opening relay B, the contact Bl of which prepares a cir euit via conductor 1 for a current supply to the wiper of section ‘2 of wiper switch’ SWI.v The current supply for this circuit is withheld by the ~t'hrowing‘over of contact Al, and this prevents f operation of ‘intermediate numbers Whilst the no circuit is completed by contact Bl when in the “on” position of itsrelay but once the switch has operated to any number, another circuit will be completed for the magnet through the make ‘and break contacts mb which are operated by the magnet. The latter then notches the switch round continuously until the wiper reaches the starting point, when the circuit opens. The :set ' ting of the transmitter is arranged to give ‘time for this return operation before a second train ' switch is wiping; ContactBZ closes a circuit ‘for 55 of impulses can be commenced. When relays ‘A, 2,411,091 B and S drop out, the original circuits for C are restored, so that C also drops out by the opening of the circuit at S2. Otherwise relay C would remain closed when contact LI remains in the off 4 wanted impulse received. Since a caller, however, cannot know the state of the‘time-lag relays, he can either take his chance that he calls when a relay is open, or will open before the call is completed, in either case getting no “ringing position,‘ All parts are now in the original posi tone” and having to commenceagain, or he can tion except‘v relay F and the circuits controlled send the time-lag relay change-over or resetting by it, which remain closed. signal in the ?rst place in any event, and so be The foregoing operations are repeated during sure of getting on to a normal relay at once, even the next train of impulses corresponding to the though the one from which he changes over is next ?gure of the code, and when Wiper switch 10 also normal. A single connection su?ices to SWI comes to rest, winding a of relay G is ener change over or reset the time-lag relays and this gised, and the contact G2 closes a circuit for its can be given by a-‘special signal sending a differ holding winding b. In the same manner, as many ent number of ‘impulses from any other code relays F——K may be operated as there are ?gures ?gure, as for example when dialling “0.” 15 in the code, and closure of the last contact K2 When the time-lag relays are changed over, the operates relay X by its operating winding b, the wiper switch section 2 sends its ?rst impulse circuit being through contacts F2-—‘K2 in series, along the line I4 and the relay Z is operated, the conductor I3, and contacts WI, THAI and ZI. circuit being via contacts W3 and VI and con The contact XI of this relay is arranged to give ductor I5. Contacts ZI and Z2 thenv change over the call signal to anyone present at the station, 20 the time-lag relay operating circuits whilst con the circuit for this being continued from termi tact Z3 closes a circuit for relay Y via conductor nals CB, and the contact X2, in‘ a circuit con I6 and contacts THBI and ZI. Contact YI then tinued from terminals CC, likewise sets in opera closes and holds relay Z, contact Y2 prepares tion a transmitter to send back a signal indicat a circuit for relay W, contact C2 being open dur 25 ing that the call is being made ‘(known as the ing the train of signal impulses, and contact Y3 . f‘ringing tone” in automatic telephone systems). Contact X3 closes a circuit for the holding'wind closes the operating circuit of relay TI-lIB. It is necessary thus to start operating the relay, other ing a of the relay to maintain the call signal and wise the relays appertaining to this operation ringing tone when delayed action relay THA op would remain locked if no code call were com erates. As there is no provision for discontinuing 30 menced after giving the change-over signal and an unanswered call at the instigation of the nothing further could be done. When contact caller, .the circuit of winding a of relay X contains C2 falls back just after the operating impulses a thermal or other time lag relay TX which will open the circuit at its contact TXI after a signal for relay Z has been given, relay W is operated by current via conductor I1 and contact Y2‘ and 35 its contact W2 completes its holding circuit so has been given for a reasonable length of time. It‘ should’be observed that the initial stages of that relay W remains closed during the opening the operations will be performed by calls to any of C2 by the further signal impulses ‘of the code. other station commencing with the same ?gure or ?gures, but that the signal'of a call to the ' present station can only be given when the last ?gure of the code has been transmitted after all the others have been given in their correct order. However, where a call to another station with a code commencing with the same ?gures Contact WI of this relay changes over the holding circuit of relays F—-K (via conductor I3) from time relay 'I‘HA to time relay THB, via conductor IS an instant (the drop-out delay of relay C) after contacts ZI and Z2 have closed, 7 ‘ If contacts WI and ZI closed simultaneously has been picked up by the present station, it re 45 with both time-lag relays closed, any of relays F-J which happened to have been just‘ operated mains an uncompleted call, and the operation by an interference would remain closed and a of the time-lag relay TI-IA after a predetermined correct start of the codesignalsJcould'not be interval opens the holding circuit of relay F and made. The special signal to changeover the The time-lag relay also operates to 50 time-lag relays therefore also serves the purpose of correctly setting the apparatus to receivea disconnect and restore the apparatus if for any of any of the others as far as J which may have operated. reason a, call to the present station is not com pleted within the said time, otherwise the call is bound to ‘be completed falsely sooner or later call should one happen to be commenced while contacts FI and F2 are closed'due to an inter ference. Contact W3 prepares a circuit for relay whenever a ?gure the same as the next in the 55 V to be completed by the next given change-over or resetting signal through ‘conductor I4. When code is sent out during a call to any other station. Owing to the time a delayed action relay may take to reset after operation, as for example, where a thermal relay has to cool it may not be possible to use it again immediately, and this may 60 mean an inconvenient delay before the station the next change-over or resetting signal is ‘given, relay V closes and its contact VI releases relay Z causing contact ZI and Z2 to change back the circuit to time-lag relay THA. 'Relay W has slow release, therefore holds contact’ WI for con can be called, especially in the interruption of a ductor l3, when'opening of contact Z3 releases relay Y, (and its contact Y2 in circuit of relay call, as where a caller (maybe through accident) W), until after contacts ZI and Z2 have operated, takes too long to complete the code or commences at the tail end of a functioning of the time-lag 65 for the reason already explained. Contact ,W3 relay due to some interference, and gets out off at then prepares the circuit for operating relay Z by the next change-over signal. ‘ To meet this case, provision is .made for . once. Fig. 2 shows an arrangement forialtering the , an alternative time-lag or time-limit relay THB to be brought into use immediately if required. . “If required” means if a call has to be made 70 or continued. Hence, the partly expired time lag relay is caused to reset or the alternative relay code of the station. Each lead from a code num ber contact of wiper or selector switch SW I is passed to one of the relays F—-K througna sec tion of a second wiper or selector switch-SW2, there being a section correspondingto 'eachre lay. As many codes can be provided asth‘erefare an unnecessary continualchange-over of time lag relays would oocurwithaevery false and un 76 contacts in each section of theswitch ‘.SWL-??d is to be brought into use by the caller, otherwise 5 2,411,091 the leads from the contacts of each section can be connected as required to any of the code num— ber contacts of section 2 of switch SWI. This can be done by connecting in a ?xed predeter mined manner each contact in each section of switch SW2 to any one of a plurality of bus bars 22 each of which is connected to a contact of sec~ 6 ergizing the second and de-energizing the ?rst of said time-limit relays should the time-limit of said ?rst relay be partially exhausted. 2. In a signal system, a signal receiving sta tion including a plurality of code relays, means responsive to impulses representing an incom plete or a. complete code signal for energizing one tion 2 of switch SWI, or switching means may or more of said relays, a ?rst and a second time be interposed to vary these connections. limit relay each having contacts connected to de To alter the code, the magnet of wiper switch 10 energize said code relays upon the operation of SW2 is notched by a hand key 71. to step the switch said time-limit relays in the event said code re to a diiferent code number, or the switch may lays are energized by an incomplete code signal, be rotated manually if accessible. The codes means for energizing the ?rst of said time-limit must always be passed through in the same order, relays, means operable by a second code signal although any one can be obtained by stepping 15 for energizing the second and de-energizing the the switch right around to the starting position. ?rst of said time-limit relays should the time The circuits for the relays F—~K will then only limit of said ?rst relay be partially exhausted, and be completed when the code for which the switch means responsive to the operation of said second SW2 is set is signalled. time-limit relay for de-energizing the second and If desired, the code may be changed automat 20 energizing the ?rst of said time-limit relays. ically on the completion of any call, but in this 3. In a signal system, a signal receiving station case only the next following code number on the including a plurality of code relays, a selector setting can be obtained. This is shown in Fig. 3. switch having a stepping magnet and a plurality The relays G—K are provided with additional of code number contacts, and means responsive contacts GI~KI all in series, and in series with 25 to impulses representing a code signal for en contact Fl of relay F. When all these contacts ergizing said stepping magnet, a second selector have been closed on the completion of the code switch having a stepping magnet and a plurality signals, the magnet of switch SW2 is energized of sections and cooperating switch arms, the and the switch notched to the position of another number of sections corresponding to the number code setting. 30 of said code relays, each contact'of each of said I claim: sections being connected to each of said code 1. In a signal system, a signal receiving sta number contacts of the ?rst selector switch, said tion including a plurality of code relays, means switch arms being connected respectively to en— responsive to impulses representing an incom~ ergize said code relays, said code relays being plete or a complete code signal for energizing 35 energized in a predetermined sequence, and a one or more of said relays, a ?rst and a second contact closed by the operation of the last code time-limit relay each having contacts connected relay to be energized, said contact being con to de-energize said code relays after a predeter~ nected to energize the stepping magnet of said mined time in the event said code relays are en second selector switch, whereby to change the ergized by an incomplete code signal, means for 40 code of said station on the completion of each call. energizing the ?rst of said time-limit relays, and means operable by a second code signal for en BRYAN JAMES HENDERSON.