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Патент USA US2110284

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March 8, 1938.`
A. 'E_BixçzHl‘ïLl-:Ty ET AL
2,110,284 A
Filed Sept. 5, 1936 -
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Filed Sept. 5, 1936
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March 8, 1938.
Filed Sept. 5,` 1936
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March 8, 1_938.
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Filed Sept. 5, ‘1936
7 sheets-sheet 7
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.74.5. BAG/«ELU
Patented Mar. 8, 1938
7 2,110,281
Albert E. Bachelet, Mount Vernon, and Smart
Brand, Bronxville, N. Y., assignors to Bell Tele
phone Laboratories, Incorporated, New York,
--~N. Y., a. corporation oi' New York
Application September 5, 1936, Serial No. 99,564
` s claims.y
This invention relates to telephone transmis
sion systems and more particularly to systems
for transmitting radio broadcast programs over
wires from one broadcasting station to another.
An object of the invention is to provide a sim
ple and ilexible transmission network, employ
ing one-way amplifiers, for interconnecting a
plurality of broadcasting stations whereby any
station may assume control of the network and
10 condition all ampliñers in the network to trans
(c1. 17a-1.1)
connection 49 between the amplifiers AI, A2, A3,
and A4. Relay I2 connected to this simplex cir
cuit operates and lights cue lamps I3 as an in
dication to the attendant at the bridging'point
that one of the studios has control of the cir
Operation of relay 8 also closes its con
tact I4 and short-circuits the normally oper
ated relay I5 oi’ amplifier A3 which relay there
upon releases. When relay _I5 releases it closes
its contacts I6 therebyclosing a circuit to op
mit from that station~ to all other stations and erate amplifier relay I'I. vRelay I5 in releasing 10
to prevent interference, by any oi' the other sta
also opens the circuit for normally lighted direc
tions, as long as said ñrst station retains control.' tion lamp I8 and the operation of relay I'I lights
Other objects and features of the’invention the opposite direction lamp I 9 which indicates
will appear from the following description, claims -to the attendant that amplifier A3 is now re
and appended drawings, Figs. 2 to 9 of which
versed and set to transmit from its associated
when placed adjacent to one another as shown studio into the network. Operation of relay I1
in Fig. l, show a hypothetical network extend- ~
connects ground at its innermost upper contacts
ing from Chicago in the middle west to Boston to place a second short circuit around relay I5
20 on the eastern seaboard with intermediate bridged
thereby holding relay I5 released in case the con- '
connections to local broadcasting stations along tact key` I at the New York studio should be re 20
the route and also to points to the south.
leased thereby removing battery i’rom the simplex
In the drawings, Fig. 2 shows a broadcasting circuit and releasing relay 8 which `would' re
station at Chicago connected by a program cir
move ground, at its contacts I4, from relay I5.'
cuit to a bridging point (Cleveland) at which
It should be here pointed out that the-ampli
point a local broadcast station is connected. fiers at the bridging point, i. e. Cleveland (Fig. 2), 25
From Cleveland the circuit continues east to the` New York (Figs. 3 and 4) identified as AI, A2,
next bridging point (New York, Figs. 3, 4, and A3 and A4 and Hartford (Figs. 6 and 7) identi
5), where a broadcasting station is connected
30 and where two other circuits are branched, one `iled as BI, B2 and B3, are arranged to normal
ly transmit from left to right, i. e., the left-hand
to the south, Washington, for example, and an
switching relays, for example relay 39 of ampli 30
other to the east. with a bridging point at Hart
fier A2 (Fig. 3) are normally operated and the ,
ford (Figs. 6 and 7) where a local station is con
right-hand switching relays, for example relay
nected (Fig. 9) and from which point avcircuit 4l) of ampliner A2 (Fig. 3), are normally re
is extended to Boston (Fig. 8).
leased. Thiscondition will be indicated to the
- A description of the circuit arrangement, in ' attendant at the bridging point or repeater sta
accordance with the invention, will now be given. tion by the lighting of the direction lamps asso
It will be assumed that the New York studio> _ciated with the respective relays, for example '
(Fig. 5) is to transmit a program and therefore lamp 4I associated with. relay 39 of amplifier
40 control key I (Fig. 5) will be operated. »When
A2. . When an amplifier is reversed, i. e. ar
key I is operated an obvious circuit is closed to ranged to transmit in the opposite direction, the 40
operate relay 2 and light guard lamp 3. Relay left-hand switching relay is released and the
2 operated connects 13D-volt battery, at its lower right-hand relay operated as in the case just
alternate contacts, to the middle of simplex coil described in connection with amplifier A3, where
4 connected across the line between the studio upon normally lighted direction lamp I8, for ex
and the nearest bridging point, in this case the ample, is extinguished and direction lamp IT
New York toll ofllce. From this point the cir
is lighted.
C _* .
cuit can be traced to the middle of the corre
Continuing with the circuit description, re
sponding simplex coil 5 (Fig. 4) at the toll oiiice lease of relay I5 closes, at its contacts 42, a
or bridging point and from that point over con
-circuit to operate equalizer relay 43 which op 50
»tact 6 of relay 'I, winding of relay 8 and con
erates and connects the equalizing network 44
tacts of key 9_to ground. Relay 8 operates in in shunt to the primary winding of input trans
this circuit and closes its contact I0 thereby con
former -45 which feeds the ampliñer tube 46,
necting 13D-Volt battery I 53 to the mid-point this equalizing network being for the purpose
of simplex coil II bridged _across the multiple‘ of compensating for transmission distortion in--
troduced in the program signalfrequencies by
the circuit over which they arrive at the am
pliiler.:- in this case, the line 2l from the New
York studio. Keys 41 and ll are for manually
controlling the equalizer relay I3. Correspond
ing relays, equalizing networks and keys are as
sociated with each of the’ other amplifiers.
Whenrelay 8 (Fig. 4) operated, and connected
13o-volt «battery to the middle of simplex >coil
Il, current flowed over the multiple connection
leads 49 in parallel whereupon relay 28v of am
-pliiler A2 and the corresponding relays of amf
pliiiers Ai and A4 operate »in a circuit includ
ing contacts OI .of relay B2, in the case of am
pliiier A2. Relay 2lin operating vcloses its con
tacts and operates relay 21 in an obvious circuit.
Relay 21 operated connects, at its contact 2|,
13D-volt batteryto the middle of simplex coil 29
and thence over the two conductors in parallel
20 of cable line 30 to the next eastern bridging point
(Hartford) where the circuit may be further
traced from-the middleof simplex coil 3i of am
piifler B2 (Fig. ’7) and contact 32 of relay 33,
winding of relay Il and >contact of the switch
I5 to'ground. Relay 34 operates in this circuit
and at its contacts 5I. short-circuits relay II
which releases.` Operation of relay M also closes
its contact I6- which connects 130-v6it battery to
ferlng with the network connections esta
by key i at -New York. as long askey I is operated.
Returning to the New York repeater station
(Figs. 8 and 4) the connection of 130-volt battery
tothe multiple connection il causes relays in
amplifiers AI and Al, corresponding to relays 2t
'and 21 of amplifier A2 to operate thereby con-`
necting 13D-volt battery to simplex lines 1l to
Cleveland and. ll to the south, respectively. The
effect of connecting battery to the line 1| at New
York is exactly the same as that when battery is`
connected to line Il extending `to Hartford and
Boston which is also true with respect to con
necting battery to the line Il extending from the '
“In the case of line 1l 'to Cleveland the circuit
operation at the Cleveland bridging point (Fig. 2)
is exactly the‘same as at Hartford (Figs. 6, '1,
and 9). From Cleveland a circuit li extends to
Chicago where the studio circuit functions ex
actly the `same as the eastern terminal of the
circuit, i. e. Boston (Fig. 8). In other words bat
tery connected to the line II at the Cleveland
bridging point extends from the midpoint of the
simplex coil U2 at Chicago through relay I8 to
ground which relay operates to prevent acciden
tal or other improper operation oi' control key Il
from effecting the switching of the amplifiers as
the middle of simplex coil l1 and thence to the - established by key i at New York, as long as that
key is -held operated.
multiple connection 52 between the ampliiiers BI,
B2, and B3 which _causes operation of relay 53.
associated with the amplifier BI in a circuit in
cluding contact 6l of relay 64 (Fig: 6) and the
corresponding relay associated with amplifier BI
(Fig. 7).
Also relay 38 operates to light cue
The key I at New York will in practice, be held
operated until the end of the New York broad
`'cast at which time it will be released thereby con
ditioning the network to be reswitched for a pro
gram from another studio, for example, .Boston '
lamp 29 as an» indication tothe Hartford re- > which will be later-described.
It will now be seen that amplifier Ai at the
peater attendant that the network is in use.
Release of relay 5i of the amplifier B2 ex ~ New York repeater station or bridging point (Pig.
tinguishes the direction lamp 54, operates equal- , 4), associated with and terminating the line 2l
from the New York studio, is reversed for trans 40
40 izer relay 55 which connects the equalizing net
.’work 51 across the primary windingY of input mission vaway from the studio, i. e., is now set to
transformer 59 and operates relay 5I which in transmit from right to'left due to the operation
turn lights‘directlon lampV 5I. _Relay “in oper~ of relay I1 and the released condition of relay il.
`Amplifier B2 at 'Hartford and the correspond
ating connects, at its contact III, a second short
circuit around relay 5I to maintain this relay ing amplifier" at Cleveland (not shown) which
released in case relay 34 is released due to release receive ,the program transmitted over lines 8l and
of the control keyI at the New York studio and 19, respectively, from New York are likewise re
the consequent sequential release of relays l, 21, versed, i. e., -arranged to transmit from ri'ght to
and 24.
n Relay B2 of amplifier BI in operating operates
relay 85 ,which relay connects 13D-voit battery,
atlts contact 08, to the mid-point of simplex
coil 61 from _which point the circuit can be traced
over the conductors loi’ line 88 in parallel to the
v55 Boston repeater station and to the mid-point of
the simplex coil 89 vconnected across the line at
that-point (Fig. 8).
From the mid-point of coil 89 the circuit can be
traced over contact 1li of relay 1I, and through
relay 12 to ground. Relay `12 operates in this cir
cuit and opens-its contact 1I thereby preventing
' the accidental operation of the control key 1l at
the Boston studio from interfering with the con
nection established by the operationf of key I at
the New York studio as long as key I remains
When battery was connected to the multiple
connection I2, (Figs. 6 and '1) by the operation of
relay 3l, it also caused relays in amplifier BI,
corresponding to relays 53 and 85 of amplifier BI ,
_ left but all other amplifiers remain set to transmit
from left to right, which is their normal setting. ‘
'I'he program transmission circuitv can now be
traced‘from, the studio microphone.“ at New
York (Fig. 5') through the associated~ amplifier,
over contacts Il and ß of relay 2l now operated
to the New York broadcasting transmitter 22, it
being noted >that whenrelay 2 is operated due to '
, operation of the control kkey an energizing circuit
is closed at its upper contact to operate relay 2l
from battery . l1 through relay 2l to ground.
>Relay 2l in operating closes its contact 24 thereby
closing a holding circuit for itself to battery 01
independent of relay 2.
Operation of relay 20 also closed its contacts
8l, It thereby connecting the microphone 22 to
the line 2l extending to the repeater station, Fig.
4, where the circuit can be further traced over
contacts l! and III of operated relay I1 to the pri
mary winding ot repeating coil Il, the secondary
of which is connected to the primary of input
transformer I6, the secondary of which supplies 70
- .
to operate thereby connecting 13D-volt battery to the amplifier tube ß. .
the line “leading to the Hartford studio (Fig. 9)r
where it caused operation of relay 16 thereby transformer 92 having a tapped secondary, the
opening contacts 11 of that relay and preventing entire winding of which being connected to con
lductors I2 and the so-called monitoring tap be 76
75 accidental operation of control key 1l from intel'
2,1 10,284
ing connected to conductors 94. The output of
the tube 46 therefore has two branches, one over
through amplifier AI from left to right in exactly
conductors 83 carrying the full gain of the ampli
fier which can-be traced over contacts 95 and 98
of relay |1 and conductors 91 tothe monitoring
loud-speaker located at the repeater> station and
the other branch,- 94,- of reduced energy output,
the same manner as that described in connection
with amplifier A2 of Fig. 3 or BIv of Fig. 6, and
thence over line 19 to yCleveland (Fig. 2) where
it terminates in an amplifier (not shown) identi
cal with B2, for example, at Hart-ford. The pro
gram signals received are amplified by ‘this am
plifier, passed to a second amplifier videntical with
BI oi’ Fig. 6 Aand extend over line 8| to Chicago
which can be traced over contacts 98 and 99 of
relay |1 and conductors |00 to transformer |0|’.
Conductors |00 are also connected to correspond
ing relay contacts of amplifiers AI, A2 and A4
but as the relays of these amplifiers, correspond
ing to relay |1,_are unoperated the circuit to
these amplifiers is open at this point.
Transformer |0| 'couples conductors »|00 to
multiple connection 49 and' consequently the out
put transmission from amplifier A3 is further
traced to the input circuits of amplifiers AI, A2 and A4 over contacts such as contacts |02 and
can be traced tothe west from repeating'coil |0| '
where it finally terminates in the Chicago trans
mitter |42.
At cleveland a third manner (not shown) but ’
corresponding to B3 at Hartford is fed by the
first amplifier in which line 19 terminates, which
further ampiifies the program signals and extends
them to the Cleveland broadcast station |43.
summarizing the foregoing. description it will
be noted that a transmission circuit now exists
|03 of normally operated relay 39 of amplifier A2.
from the studio- at New York (Fig. 5) -overline
22 through amplifier A8 of Fig. _4 where it
Following the circuit _through amplifier A2,for example, the transmission path extends to
the primary of repeating coil |04 and thence
branches in three directions, one to the east
through amplifier A2, Fig. 3, over line 30 and
through input transformer |05 to amplifier tube . through. amplifier B2 at Hartford where it
|06. The full energy output vof tube |06 can be branches in two directions, one through amplifier '
traced through output transformer |01 over con
B| and over line 68 to Boston and the other
tacts |08 and |09 of relay 39 and conductors || 0 . through amplifier B3 and over line 15 tothe Hart
to the cable line 30-extending to Hartford where
it enters associated amplifier B2, Fig. 7, over con
ford broadcast station.
At New York the second branch extends to am
plifier AI and over line 19 to Cleveland where it is 30
tacts ||| and ||2 of relay 56, and through repeat-.
ing coil_||3 and input transformer 59 to the branched in two directions, one branch passing
amplifier tube H4. Fromthe. output of -trans
over line 8| to Chicago and the other to the Cleve
former ||5two branches extend, one branch in
cluding the full secondary winding of trans- '
|| 5, conductors ||6, contacts ||1 and ||0
V35 vofformer
relay 50 and conductors ||9 extend to the
monitoring loud-speaker at the Hartford re
land broadcast station.
The third branch includes amplifier A4 and line
80 extending to the south where it may terminate 35
in another bridging amplifier arrangement and
be branched in two or more directions or it may
peater station and the other branch, including -extend to and terminate directly in a terminal
only a portion of the secondary winding of trans-` 'broadcast station such as Washington, for ex
40 former H5, conductors |20, contacts | 2| and |22 ample.
of relay 56 and conductors |23 extends to the
It will be understood that the line 30 fromNew
'repeating coil |24 which couples conductors |28 York to Hartford, line 68 from Hartford to Boston,
with the multiple connection 52 which is bridged line 19 from New York to Cleveland, line 82 from
to the left-hand terminals of all'three amplifiers. Cleveland` to Chicago and line 80 from New York
Due to the fact that relay 5| of amplifier B2 is
released the connection is open between conduc- v
tors 52 and this amplifier, but as relay |25 of am
plifier BI
and the _ corresponding relay
shown) of amplifier B3 are normal, i. e., operated
50 the transmission circuit now branches in two di
rections, one branch being over contacts |26A and
|21 of relay |25 of amplifier B| to the primary
to >the south may, and in practice will, include
further reversible amplifying means adapted to
be switched or set to transmit in` the direction of
the program signals under control 'of the key at
the studio originating the program. These am
plii'ying means will be identical with the ampli 50
fier-s shown, as before described, and further de
scription appears to‘be unnecessary.
. f
winding of repeating coil |28 and thence through
It will now be assumed that when the program
input transformer |29 to the amplifier tube |30.y being transmitted by -the New York studio is
55 The loutput of tube |30 includes the transformer
finished and some well known “cue”> signal, 'such
|3| which has two branch-es; one the low` level , as a musical note, is transmitted over thecircuit
output, including the tapped~ portion of the sec
ondary winding, connected to conductors |32
terminates in resistance |33 over contacts |34
and |35 of relay |25.
which will be heard by an attendant of each of
the connected broadcast stations, the attendant
at New York will release key | and, asBoston is
The other, or high energy i scheduled to transmit for the next period, an at
level branch of the amplifier output, which in
tendant at the Boston studio will operate the con
cludes the full secondary winding of transformer 'trol key 14 at that point. _The release of key ~| '
|3|. is connected to conductor |36 and extends at` New York will release relay 2 thereby discon
over contacts |31 and |38, of relay |25 and con
nectingbattery from the mid-point of simplex
ductors |39 to line |6 extending to the Boston
station where it terminates in» transmitter |40
from which point it goes on the air.
The other branch of the transmission circuit
-from repeating coil |24 is through amplifier B3
70 from left and right in exactly the same manner as
that just described for amplifier BI and thence
over line 15 to the Hartford broadcast station
where it terminates in the transmitter |4|.v
Returning to the New York repeater station
75 (Figs. 3 and M the lprogram transmission circuit
coil 4 connected across line 2|.
Relay 2 in releas
ing also opens at its upper contact the original 65
energizing circuit for relay 20 buty this relay is
now held over its own contact 24 and consequent
ly dces not release at this time.
Removal of- battery from the simplex'circuit
comprising line 2| releases relay 8 of amplifier A3
which disconnects battery from the mid-point of
simplex coil || and also removes, at its conta'ct |4,
the original short circuit from relay |5. This re- '
lay, however, is now short-circuited at the inner` 75
» 4
' uppervc'ont'acts of operated relay I1 and therefore
remains released. Removal of battery from sim
plexcoil Il releases relay 25 of amplifier A2 and
the corresponding relays, not shown, of ampli?ers
AI and A4. The release of relay 28 releases re
lay 21 which disconnects, at its contacts 28, bat
tery from simplex coil 29 which causes the release
B2 is now reversed and arranged to transmit from
right to left, i. e., from Hartford to New York.
Battery connected to simplex coil |41 operates
relays (not shown) in amplifier Bl corresponding
to relays |49 and 33 of B2 which connects bat
tery over the simplex circuit superimposed on
line 15 at the Hartford 'studio which operates
relay 15 which again opens contact 11 to prevent
of relay 24 associated with amplifier B2. Release 'false operation of key 18 from interfering with
of relay 34 removes, at its contacts 38, battery the switching arrangement _established by key 14
from simplex coil l1 and also removes, at its con
at Boston. Relay 16 in operating closes its lower
tacts 5l, the original short circuit around rélay 5| ' contacts thereby short-circuiting relay-'|45- and
which,.however, does not operate due to the short insuring that it will not be falsely operated;
, circuit around this relay closed atcontacts 50 4of
operated relay 55. y
The removal of battery from simplex coil 21
relases relay 5I of amplifier Bi and the corre
As amplifier B3 was not reversed for the pre
ceding broadcast itsswitching relay correspond
ing to relay 5| of B2 was operated and the relay
to 58 was released and consequent
sponding relay of amplifier B3. _Release of relay :corresponding
ly operation of the relay corresponding to’relay5I releases relay 55 which removes battery from Il has no effect on the relay corresponding to
simplex coil 51 which, in turn, releases relay 12 relay 56 and the amplifier remains in its normal 20
at the Boston studio which closes its contacts 13 condition, i. e., arranged to transmit from left to
thereby preparing a circuit to operate relay 1|, right into line 13 to the Hartford studio. Up to
under control" of key 14, which we have assumed this point it will be noted that amplifier Bi'is
_will be next operated.
The removal of battery from simplex 'coil 31
aflso causes the sequential release of relays (not
shown) in amplifier B8 corresponding to relays
5l and 55 of amplifier BI which causes battery to '
be removed from the simplex'path over line 15
to the Hartford studio which causes the release
of relay 15.
reversed, i. e., is adapted to transmit from right
to'left from line 6I coming from Boston into the 25
other two amplifiers _B2 and BI.- Amplifier -B2
which was in a reverse condition. i. e., arranged
to transmit from the NewYork line 3l' to the
other amplifiers BI and B3 during the previous
broadcast is now turned around into its normal
i. e.. adapted to transmit from the
It will be noted that at all studios other than condition,
BI into the New York line Il.
the one originating a program the operation of - Amplifier BI remains ,in its normal condition, i. e..
relays, such as 12 of Fig. 8v and 15 of Fig. .9, in
Varranged to transmit from the output of am
addition to opening their upper contacts.' also
close their lower contactsthereby short-circuiting
the corresponding switching relays |44 and |45
thereby insuring that these relays will not be
’ falsely operated
to interrupt the program being
received and broadcast. ’Similar relays release in
the same manner at Cleveland and Chicago (Fig.
2) due to disconnection of battery from the mid
point of simplex coil || of theANew York am
plifier A3.
` As before stated. it will _now be assumed that
Boston is to originate a program for the next
plifier Bi into the Hartford studio line 15.
Battery connected to coil Ily of amplifier B2 by
the operation of relay “passes over line Il to
the New York repeater station and operates relay
t2v of amplifier A2 which connects battery toslm
plex coil 25 andshort-circuits relay 35 which now
releases and' in turn operates relay 4l -thereby
completing the reversal of this amplifier and con
ditioning it'to transmit from right to left, i. e.,
from line Il into the other ampli?ers of the sta
tion, i. e., AI, AI, and A4.
Connection of battery at the mid-point of coil
25 operates relay |5| of amplifier AI which in turn
broadcast period and therefore when the cue
signal is heard by the Boston attendant he will operates relay 1. Relay 1 in operating connects
'operate key 14. With key 14 operated, as soon as battery to the simplex coil 5 and short~circuits
relay 12 releases. as Just described. a circuit is relay |1 which releases and removes .the short
closed to operate relay 1| which‘connects battery circuit from relay i5 which thereupon reoperates
at its lower contacts, Vto simplex coil 5s and at thereby restoring this amplifier toits normal oon
its upper contacts closes an energizing -circuit dition, i. e., for transmission from left to right
for relay |44 which operates and connects the and into line 2l to the New York studio. Connec- '
studio microphone |44 through the amplifier to tion of battery to the simplex coil 5 connected
. across line 2| Icauses relay. |62 at-the New York
line 8l in multiple with the transmitter |45.
‘ Battery on the simplex circuit of line il can be
studio to operate thereby short-circuiting relay
traced to the mid-point of coil 51 of the Hartford
2li which releases and disconnects the studio
amplifier Bi‘äwhere it operates relay I4 which
connects battery to simplex coil |41 and short-
microphone circuit from line 2|,
Battery on the simplex circuit of the multiple
circuits relay` |25 which releases. The release of connection 4l~ also operates relays (not shown)
relay |25, closes its inner lower contacts, thereby' , in ampli?ers AI and A4 corresponding to relays "
operating relay |45, thus completing the reversal l |5| and 1, for example, of amplifier AI which
connects battery over the simplex circuit of linev
of amplifier BI which is identical with the re
versal operation of 4ampliñer AI as more fullyv 1s to Cleveland and line 55 to thev south, re S.
described earlier .in connection with the operation
Battery on _the simplex of line 1! causes relays.
of key | at the New York studio.
l ,
not shown, at> Cleveland to operate which con
Connection of battery to simplex coil |41 op
nects battery to the -simplex circuit of line Il
erates relay |49 of ampliiier B2 which in turn op
erates relay 33. Operation of lrelay 33 connects at Chicago and tothe Cleveland studio line for
-battery to simplex coil 3| and. at its contacts the purpose of locking out the control keys at '
|54, short-circuits relay 55 which now releases. these points, key 84 at Chicago, for example.
' As the amplifier at- Cleveland waspointed in _
-The release of relay 50 opens its contacts 50 there
_by removing the remaining short circuit around the normal direction, i. e., from left -to right to
relay‘ll which relay now reoperates. Amplifier transmit from line 1l to Chicago, and to the 75
2,1 10,284
Cleveland studio, this amplifier remains in this
condition for` the present broadcast which also
arrives over line 19.
other stations as long as the`switching means at
» the one station is operated. ,
4. In a two-way program transmission system,
a plurality -of program stations, lines i'or each
station connected in multiple to all other station
lines, a one-way ampliflervin each line,'means
'I‘he program transmission circuits now estab
lished are the same as that previously described
except that the New York station is now set to
receive the program originated at Boston instead . associated with each‘ampliñer to reverse the
of the reverse condition previously assumed when pointing of said amplifiers in their respective.
New York was conditioned to originate and Boston lines, manually operated switching means at each
10 to receive.
station adapted to transmit direct current over
It will be understood that the network herein all of the lines to operate the reversing means io
describedis a purely hypothetical one and other associated with amplifiers pointed in the direc
~arrangements, employing the same method and tion of the station at which thelswltching means .
instrumentalities for securing transmission over is operated,~ and other means at each station re
>a network in either direction with one-way am
plifiers or repeaters may be used if desired with# sponsive to direct current, transmitted from an
otherstation, to prevent transmission of direct
out departing from the spirit of the present in
current therefrom.
vention as covered in the appended claims. '
What is claimed is:
l. In a two-Way program transmission system,
a plurality of program stations adapted to trans
mit or receive a program, «a repeater station, a
line for each lprogram station connected in mul
tiple to all other'station lines at said repeater
station, a one-Way voice frequency amplifier in
each line at the repeater station and normally
pointed toward its respective program station, a
simplex circuit, comprising the conductors of all
said lines, extending from each station to all
other stations, sources of direct current, manu
5. In a transmission system, a plurality of lines
connected together at one end and extending to
stations at the other ends thereof, a. one-way 20'
amplifier in each line, eachamplifler being nor
mally connected, in its respective line, to transmit
in the same direction with respect to the con
vnecting point, means associated with each ampli
fier to reverse its transmitting direction With're
'spect to its vassociated line, manually controlled
switching _means at each station for transmitting
control current over all of said lines toactuate
all amplifier reversing means associated with
amplifiers which 4are normally pointed in the di 30
rectionof the station at which the switching
ally controlled switching means at each station
.for connecting one of said current sources to said . means is actuated, said reversing means being
simplex circuit. means associated with each am-I
> plifier adapted to repeat said direct current
' around the amplifier in either direction, other
means associated with each amplifier responsive
' to direct current arriving over the simplex cir
cuit from. its respective program station to re
verse said amplifier and point it toward the‘other
40 lines, and other means at each station responsive
to direct current arriving over the simplex cir
cuit for disabling the switching means thereat
as long as said incoming current persists.
-2. In a program transmission system, a plu
rality of program stations, a line for each station
arranged 'to operate only when said control cur
rent is received from the direction ltoward which
the associated amplifier is normally pointed, and 35
means at each station responsive to control cur
rent transmitted from another station to disable. f
the switching means thereat while said control
current is connected to the line.
6. In a program transmission system, a plu
rality of program stations,'a line for each sta
tion ‘connected in multiple to all other station
lines, one-way'ampliñers .connected in each line,
sources of control current, manually controlled
switching means at each station for connecting
connected' to all other station lines, one-way - one of said Vcurrent sources to the respective line,
means associated with _each amplifier adapted to
repeat said control current around the amplifier,
amplifiers in each line, means associated with
each amplifier adapted, when operated, to re
50 verse the connection of the amplifier with respect Y other
means associated with each'. amplifier
>adapted when operated to reverse the connection 50
of the amplifier with respect to its normal trans
tion for transmitting a control current over its mission direction in its line, said reversing means
line to all other lines to actuate all _reversing , being so arranged that it is responsive only to
associated‘with amplifiers which’areI nor
control current coming over the line in the oppo
to its normal transmission direction in the line,
manually controlled switching means at each sta
mally connected to transmit toward the station
at which the switching means is operated, and
means at .each station responsive to the contro-l
current received over the respective lines to dis
60 able the switching means thereat as long as said
control current is received.
3. In a two-way program transmission system,
a plurality of program stations, lines for eachsta
tion connected in multiple to all other station
65 lines, a one-way amplifier in each line adapted to . `
be reversed with respect to its line, relay means
associated with each amplifier for reversing the
amplifier, manually controlled switching means
at each station for operating all reversing means
70 associated with ampliñers in the system which
are not normally connected to transmit away from
the station at which the switching means is oper
ated, and other means at each station responsive
to operation of av switching means at one station4
75 to disable the switching means at each of the
site direction from that in which the amplifier is 55
normally connected to transmit, and other means'
at each station responsive to control current re
ceived over the respective line to disable the
switching means _thereat and prevent the connec
tion of other control currents to the line as long 60
as said first control current is received.
'LA system in accordance with claim 6, in
which each of said amplifiers has two output cir
cuits, each of different energy level, and in which
the higher energy output is normally connected
to the line, characterized in this that means are
provided responsive when said amplifier is re
versed to disconnect> the higher energy output
from' the line 'and substitute the lower energy
output therefon’and to connect the higher energy
output to a monitoring receiver'.
8. A system in accordance with claim 6, in
which each amplifier has an input. circuit and
two output circuits, each output circuit being of '
' 6
2,110,1)34 '
a diiIerent energy level», 'and in which the higher
energy output circuit is normally connected'. to
the line in one direction and the input lcircuit to
the line in the opposite direction. characterized
in this that each reversing means is so arranged
that when its operation is initiated that the. input
and high level output circuits of the associated
amplifier are iirst disconnected from the line and
after a momentary delay the input circuit and
the low level output circuits are connected to the
line in the opposite transmission direction.
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