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Патент USA US2411091

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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
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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.
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