TP-7 Instruction Bulletin

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INSTRUCTION BULLETIN
FOR
TELEPHONE REPEATER-<P-7
Signal Corps, U. S. Army
Order No . 12930
- Phila. - 42
FORT MONMOUTH SIGNAL CORPS PUBLICATIONS AGENCY
FOR REFERENCE ONLY
DO NOT TAKE
FROM THIS ROOM
• BY ORDER OF THE DIRECTOR
n4- F't. Mon .- J2-4-43-5M--HQ
~~~~~~~~e_­
MANUF ACTUBED BY
!ntcrnational retepltone ~ J<adio ;Mfg. eorp.
UNITED STATES OF AMERICA
INSTRUCTION BULLETIN
FOR
TELEPHONE REPEATER TP-7
Signal Corps, U . S. Army
Order No. 12930
-
Phila. - 42
MANUFACTURED BY
JJtterJtatioJta! retepltoJte .t J(adio ;tlfp. eorp.
UNITED STATES OF AMERICA
I
October 15, 1942
CONTENTS
Section
Subj ect
Page
Genera l ......................................................................... .
2
Mec han ica l Description
2. 1
l ~epeate r
2.2
P ow er U ni t .................................................................. 2
2.3
!\ sse m b Ied Un its ---- -·-·····················---·-·---········-········-- 2
3
U nit ..............................................................
Circuit D esc ript ion
3. 1
I ~ cpea ter
3.2
l)o wer Unit ..................................................................
4
Unit .............................................................. 2
5
O peration
4.1
Ge nera l ..........................................................................
5
4.2
·Powe r Connections ....................................................
6
4.3
Line Co nnec tions ........................................................
7
4.4
Circui t Operation ......................................................
7
4.5
Mon ito ri ng and Talking ............................................
7
4.fi
~
8
5
igna lli ng ....................................................................
Parts l ist
5. 1
T elephone R epea ter TP-7........................................
8
5.2
W93-22 T elep hone Rep eater U ni t................ ............
8
5.3
W93-23 Power Un it .................................................. 10
5.4
W93-21 O uter Case E q ui pped w ith Spares ............ 11
5.5
W93-11 A. C. Mains Power Cab le ............................ 11
5.6
W93- 12 Curren t Supp ly Cab le ................................ 11
LIST OF PHOTOGRAPHS AND DRAWINGS
F ig ure
Subj ec t
Page
Repea ter Unit with out Du st Co ver (Back V iew)____
12
2
Repea ter U nit with out Du st Cove r (Front V iew )..
13
3
Repea ter Unit ------ ---------- ----'- ------------- ------- -- ----------------------
14
4
Relay Rack Mounting of Teleph one Repeate r T P-7
15
Sa
] ower Unit
16
Sb
Power Unit without Dust Cover__ _____________ __________ _______
17
Ga
T elep hone Repea ter with Case Cover open____________ ____
18
ob
T eleph one Repeater with Case Co ver cl osed____________
19
7a
Typical F our Wire Circuit________ _____ __ __ __ ___ _______ ______ _________ 20
7b
Transform er Connection s a t th e V ari ous Impedance
Switch P ositi ons ------------------------------ -- --------------------------
21
8
Simplifi ed Sc hemati c Diagram of Amplifier ._____ ________
22
9
Co nn ec tions for Impedan ce Switches S-1 and S-2.. __
23
10
Circuits of E qualizati on for E ach Position of Switch
24
11
F requ ency Curv es of Repeat er and Cabl e__ ________________
25
12
Schematic of Power Unit_________________ _______________________________
26
13
P anels for Repeater Showing Cabl e Co nn ections______
27
14
Co nn ec tions for T alking and Monitorin g __ ____ ______________
28
15
Schematic Circuit of T eleph one R epeat er 1 P -7__ ____ __
29
TELEPHONE REPEATER TP-7
1.
GENERAL
Te lep hone repeate r TP -7 is intended to use on fo ur wire Jin es eith er
as a throug h or a term in a l repeate r. It is arra nged f r portab le field u se
or for mounting on a r elay rack in an office. It co nsists esse ntially of two
two-stage a mplifi er s ar ranged o t hat th e in puts and outputs can be
sw itched to prese n t eith er 300 ohm or 1200 ohm im pedan ce to the lin e
as req uired or 600 o hm impedance w hen use d a a ter minal repeater. In
ord er to co mpen sate for variation of the transm ission los w ith freq uency
ove r the lin e, a n eq ua li ze r w hi ch can I e switched is prov ided. The
switched positi ons make possible a fl at o·ain fr eq uency cha racteri stic or
one whi ch slopes to co m pe nsa te for diffe rent lengt hs of lin e. Each ampli fier has a n ope ratin g gain of abo ut 35 db at 1000 cy cl es per second
irrespective of the eq ua li ze r se tting. Under norm a l ope ra tin g conditi ons
th e re1 eate r i capab le of ha nd lin g a powe r leve l of + 20 dbm.
A power unit is prov ided, wh ich su pp li e t he r eq uired power for
ope rat in g the re1 eate r fro m eith er the A. . main s or from a 12 vo lt
battery w ith a 100 cy cl e per second vibrator. In add ition, a m eans is
prov id e I so t hat th e powe r may be obtain ed from local 24- 130 v batteri es.
T he curren t drain s for these method s of suppl y in g power are as
foll ows:
Power ·~t jJJJl·y
A. C. ( Lin e)
A.
(Lin e)
Battery
Office Battery
Office Battery
2.
Vol tage
110
220
12
24
130
C~ot?Tent
110
55
1
150
20
milli a mp eres
milli a mp eres
a mpere
m iII iam peres
milli a m per es
MECHANICAL DESCRIPTION
2.1 Repeater Unit
T he repeate r unit comp ri ses a chassis type asse mbl y 17" x 5% 6 " x
3~" as s how n in photograp hs F ig. 1 a nd Fig. 2. This chassis h as
mo unt ed on it the co mpon ent part s of t he two amplifi er s a nd is enclosed
in a m etal du st cove r , as hown in protograp h F ig. 3. The location of
the necessary gain con trols, w itches a nd termin als fo r makin g the connections to the lin e. for ope ratin g the repeater a re hown in the upp er
pan el of t he r ack moun ted repeater a· in photograph Fig. 4.
T h e eq uipm en t fo r each a m pli fier occu pies one half the length of
t he chassis. T he e 1ua li ze r coil , inpu t a nd output coil a n l gain contro l
with associated switches are mounted in thi s ·equence from either
end toward the ce n ter . T he two tubes of each a mplifi er are mounted
in a w ell left a nd ri g ht of the verti cal ce nte r lin e a nd a re cover ed by a
r emovab le plate so t ha t t hey ar e read il y accessibl e. A plu g is mounted
o n th e bottom of th e chassis for making the pow er conn ections by means
of t he s pecia l cable s uppli ed w ith the repeater.
2.2 Power Unit
The equipm ent for the power supply is as ·embled on a chassis
similar in design to the repeate r unit as show n in photographs F ig. Sa
and Fig. Sb and in the bottom panel of Fig. 4. It contain s the power
transfo rm er, rectifier and fi ltering arrangemen ts for operatino" lhe heaters and plates of th e tubes in the repeater from A. . mains. W hen a
12 vo lt torage battery is the so urce of power, it i · used in co njuncti n
with a 100 c. p. s. vibrator to energize the tran former feed ing the rectifier. Under thi condition t he heaters of the vacuum tubes are operated
direct ly from the I attery. T erminal s, fuses and switches arc mounted
on the pane l of the chassis asse mbly. A plu g for connecting power to
th e repeate r is moun ted on the bottom of the chassis.
2.3 Assembled Units
Both the repeale r and the power u nit have brackets at ll1c ends so
that th ey can l.)e mou nted on a relay rack as show n in Fig. 4 o r in a case
as shown in F ig . 6a. A wooden case is p rov id ed for mounting both the
repeater uni t and the powe r unit. Th is case is 20" x 8" x 9;;.;1." and is
eq uipp ed with straps so that it is read ily portab le, as ·hown in photog raph s F ig. 6a and 6b . T he case with rq eater a nd power uni t mounted
in it weighs about 38 po un ds. Wh en the cover is opene l, lhe ter minals,
sw itches and co ntrols are exposed so that they are readi ly avai lab le f r
makin g con nect ions and operation, as show n in photograr h Fig. 6a. The
power from the power unit is ·uppli ed to the repeater unit by mean s o f
a cabl e w ith a socket on each end, wh ich ma tches the plu g mounted on
the uni t·. Two spare tubes, two spare fuses, a socket fo r connectin g the
repeater to a 24 v - 130 v supply, a spare vibrator and a pare socket to
fit th e plug marked A. ·.Main are mounted in t he cove r of th case.
When the repeater and power unit are m unted together on a relay
rack, t he same cabl e w ith sockets on each end as is used with the case
may be used for making the co nn ection to supp ly the power to the repeater unit, ot herwise a longer cab le between plu gs wi ll be required.
In case the repeater is install ed where the office batteries are avail able
for operatin a it, either on an emergency basis or in place of the power
uni t, a socket i provided which fi.ts t he plu g in the repeater a nd can be
wired so t hat the proper co nnections can be rea lily made to the batteries,
as shown in F ig . 12. T his socket is mounted in the cover with the spare
parts.
3.
CIRCUIT DESCRIPTION
3.1 Repeater Unit
Th e repeater unit consists of two amp lifiers, with an eq ua lizer for
each and 3 position switches to change the gain frequency characteristic
from Aat to different slopes to co mpen sate fo r lin e conditions . Switches
are a lso provided to chan ge th e input and output impedance of the amplifi ers from 300 to 1200 ohms and to con nec t the input of one amplifier
and th e output of the other to a two-wire 600 ohm connection fo r terminal use . The diagrams of Fig. 7b show the different arrangements possible when th is repeater is connected on a four-wire line.
2
The two amp lifi ers are identi ca l in design. T he cir cuit of one is
show n sc hema ti call y in F ig. 8. The transformer T1A actu a ll y consists
of a repeat in g coil and in put transformer co ntain ed in one case . The
eq uali zer is designed to have a nominal im pedance of 600 ohm s and is
co nn ected between t he repeatin g coil and t he in put transformer.
The repeatin g coil has an im pedance ratio of 300:600 o hm s between
th e 1-3 and 6-7 windings and 1200-600 o hm s between the 1-3, 4-5 windin gs connected in se ries a nd the w in ding 6-7. T he two halves of the
1-3 w indin g a nd t he winding 1-3 and 4-5 are accurate ly balanced so
that the terminals 2 a nd 4 may be use d as a phantom tap for throug h
signalin g at 20 c.p .s.
T he pi-oper co nnections, de[ end in g o n whether it is the two-wire
s id e of a term in a l repeate r or on the im peda nce of the li ne fo r four-wire
ope rali on, a re obtain ed by mean s of a 3 positi n sw itch show n schemat ica ll y in Fig. 9 as S- 1. Positi on 1 conn ects two windings of the TlA
input co il of amp lifi er A to two w in din gs of the T2B o utp ut coil of a mplifier B ·o as to give a ·two way or hyb ri d coil conn ecti on. It will be
no ted th at: the windings 4- 5 of eac h co il are conn ected in seri es opposing
through a conden er so that tra nsmi ssion from the two-wire lin e divides
eqna ll y between t hem. The currents indu ced in the windings 1-3 of each
coil , whic h ar e conn ected in seri es a idin g through the co nd enser and 600
o hm resistance to fo rm the network circuit, ar e in opposite directions
so that littl e or no ene rgy i lost in the network depending o n the balance 1 etween the 600 ohm r esistance and th e lin e imp edance. The
energy from the lin e i divided between the w in dings 4-5 of TlA and T2B
coil s so t hat one ha lf is transmitted into t he in pu t of t he A amp lifi er and
one ha lf into the output of th e B a mJlifi er a nd is lost in the plate circuit.
O n the ot h er hand , for transmission co min g fro m a mplif1 er B, currents
are in duced in the lin e a nd netwo rk circui ts through the windings 4-5
a nd 1-3 of the T2B coil. These currents Aow in to windings 4-5 and 1-3
of the Tl A co il in opJ osite direction s so that no energy passes into ampliher A when th e terminal eq uipm ent is balan ced by the network. O n e
ha lf the energy received is transmitted to the two-w ire lin e and on e ha lf
is lost in th e netwo rk. For hyb rid coil ope ration, the win lings 1-3 a nd
4-5 of eac h of the co il s TIA a nd TlB mu st be accurately balanced. The
cond ense r in the lin e side of th e hyb ri d co il co nn ection is r eq uired to
block a ny direct current o n the lin e and to provid e phantom taps which
are taken fro m each sid e of this co nd en. er. This conden ser is balanced
in the network circuit by one of app rox im ate ly eq ua l value. In order to
fa cili tate rep lace m ent, if one of t hese condense rs becomes defective, they
a rc . elected in g ro up s of a pprox im ately eq ua l capacities and marked A,
D or C, th e eff ective one should be rep laced from the gro up corre pondin g to the letter on t he o ne replaced. If one of the same let ter is not
available, then both s hould be r ep laced with a pair from one of the oth er
groups.
Position 2 conn e ·ts the windings 1-3 of T l A a nd T2B coil s to the
.1
input a nd outp ut fou r -wire terminals r esr cc tive ly lo o-ive lh e 300 ohm
imp eda nce a nd co nn ec t tap 2 in eac h ca ·e to th e termin a ls ma rked l>h-In
a ncl Ph-Out. l>osition 3 co nn ec ts th e w indin gs 1-3 a nd 4-5 of eac h o f t he
coil s in serie and to the inp ut and o utpu t fo ur-w ire term in a ls to provide
the 1200 ohm imr edan e. It a lso conn ec ts termin a l 4 of each [ th e coils
to th e te rm ina l · Ph -In a nd ·1 h-O ut.
Th e input tran sform er h as an imp edan ce r atio to g ive 600 hm on
th e low side w hen terminated in t he 250,000 o h m potentiomcl r o n the
high side. Thi s potentio meter is co nn ecte d to t he g rid of t he Vl.A
(VT 198A) tub e so t hat th e gain of the a mr lifi er can I c co ntroll ed co ntinu ou ly in a r ange fr om 0 o utp ut lo a gain of abou t 35 db. The V 1A
tub e is res istan ce co up led to th e V2A (VT 19 A) t ub e whi ch, in lurn,
i. co nn ec ted to th e o utput transform er T2A termin a ls 8 a nd 9.
Tran sform er T2A has a monitorin g wind ing 6-7 whic h i · co nn ec ted
betw ee n a monitorin g termin a l a nd g ro und . T ermin a l 6 i · a l. o co nn ec ted
throug h 11 ,300 o hm s to termin a l 9, of the T l A tra ns fo rm er, a nd lo 0 Tound
throug h a 600 ohm r esistan ce t g ive nega ti ve feed! ack in order to ·tabi li ze th e gain of th e repeate r fo r var iations in the perating vo ltao·es. T he
impedance rati o of windings 8-9 a nd 1-3 r 8-9 a nd 1-3, 4-5 in se ries is
such as lo giv e the op timum imp edance terminati on f r the p late o f the
V2 tube when winding 1-3 i termin ate d with 300 oh ms o r w indin g 1-3,
4-5 in se ri es a rc ter min a ted in 1200 ohm s. Th e windin gs 1-2, 2-3 a nd 1-3,
4-5 are accurate ly bala nce d so tha t coil taps 2 a nd 4 m ay be used as
phantom laps for co nn ec tion to the correspondin g te rmin a ls o f th e T1A
or T2B tran sfo rmer to byr as sig nalin g curren ts of 20 c.p.s. Depend in g
on th e lin e impedance, th e proper imp edance a nd tap f r t he A OUT an I
BI N am plifi er is selected by means of a two positio n sw itch , S-2. hown
in Fi g. 9, in th e sam e mann er as for A IN and B OUT, excer t that no
tw o-wire conn ec tion i prov id ed. Positio n 1 is fo r th e 300 o hm and pos iti on 2 for th e 1200 ohm imp edance.
u
r
Th e biasin g vo ltages for the vacuum tub es are obtain ed fro m cath ode
resistan ces. Th e voltages at th e p we r terminals a re 110 v for t he input
stage and 130 v for outpu t stage when m easured with a hig h r esistan ce
vo ltm eter a nd 12 v for two h ea ters in seri e .
H no ne of the element · of the equalizer were onnected, th e over-all
gain betwee n the in put and o utput ter min a ls would I e abo u t 57 el l at
1000 c.p. s. with a fair ly Aat gain fre 1uen cy cha racteri stic I etwee n 300 to
10,000 c.p. s. :Howeve r, the r epeater is desig ned ·o as to giv e a maximum
gain at 1000 c.p. s. of abo ut 35 db w hich is the value obtain d w h en the
equ alize r is se t to positi on 3. A pad of 3.8 el l is ad ded to th e P os. 2. ttin g
of th ee 1ualize r a nd a pad of 21.5 lb for th e P os . 1 ( Aat gain ) setting in
ord er to mainta in 35 db gain on a ll se ttin gs of the equalizer switch . This
obv iates hang in g the gain con trol potenti meter w hen cha no·es in
eq ua li zation a rc mad e. P os iti on 2 w ill eq ua lize al o ut 7.5 mil es a nd po ·i. lion 3 a l out 15 mi le of B riti h arm y fie ld quad cab le. Th e eq ua lizer circuit s for eac h of th e t hree I ositions a re sh own in F ig. 10.
T he gain co ntrol potentiometer is g rad uated in 10 equa l steps and
marked fro m 0 to 10. Gain frequency characteristics of th e r epeate r for
different position: of t he eq ua li ze r a nd lo ·s fr equ ency characteristics of
th e cab le are s how n in F ig. 11.
Th e repeater is capab le of ha ndling a n o utput pow er of 100 milliwat ts or + 20 dbm wit h ab ut 3!f'o harmonics.
A neon la mp with tra nsfo rm er (T-3) is prov id ed to be used as a
leve l indi cator. T hi s in dicator may be co nn ected across the output of
either amp lifi er by throwin g the " level" sw itc h S4 to eith er A orB side,
as show n in F ig . 8. Th e gain co ntrol is th en a lju ·ted until the lamp
gl ow s, w hi ch indicates a n output of 6 to 8 dbm.
Th e moni torin g termin a ls A and B ar e co nn ec ted through a swi tc h
ma rked TALK. to th e monitorin g windings a nd also to th e output termin a ls of th e T2A a nd T2B coil s re pe ctiv ely. This a rrange m ent makes
it possill e to monitor and talk on the lin e in eith er direction from the
monitorin g termin a ls.
3.2 Power Unit
Th e circuit fo r furni shin g power for the ret eate r is shown in Fig. 12.
I t is a rranged for ope ration either fro m the A. C. supply of 100-125 or
200-250 v or fro m a 12 vo lt bat tery. Wh en t he A. C. is used and co nnec ted to the ·ocket ma rked A. . Main s, th e switch S6 sho uld be thrown
to th e positi on marked "M I N " and the w itch S7, which conn ects
th e ma in s voltage to th e tran ·fo rm er T , ad ju . ted to the vo ltage of supply .
Thi s ad ju stment sho uld a lways be made w ith sw itch S6 ope n in ord er
l o prevent the possibility of ext rem e vo ltages at th e hi g h voltage windin g. Th e main s vo ltage is stepp ed up by the transform er T a nd the high
voltage fro m termin a l 10-11 r ectifi ed by th e rectifi er, fi ltered and resista nces prov id ed to g ive th e req uired D. C. vo ltage s at th e terminal s.
Th e hea ters a re sup plied from a 12 vo lt w in ding 13-14 connected through
one f the p les of 6 sw it ch. W hen th e batte ry i used, the switch S6 is
thrown to position marked BAT and the battery co nn ected to termin a ls
marked 12 v with polarity a· marked. Thi OJ erates the vibrator which,
co nn ected to a windin g of th e tra nsfo rmer, generates th e hi g h voltage
across termina ls 10-11 which i r ectifi ed an I fi lt ered, as previous ly, giving
the r equired D. C. vo ltage·. T he power for th e h eate rs i furn ish ed di r ec tly fr m th e batte ry t hroug h a p le of th e S6 witch wh en thrown in
th e BAT directio n.
A fter everal t ho u and hours of servi ce, t he rec tif1er resistance goes
up due to agin g whi ch r ed uces the 130 a nd 110 vo lt A. C. plate battery
voltages . At that tim e th e co nn ection on te rmin a l 11 of the power transfo rm er may be r emove I a nd co nn ected to the hi g her potential terminal
12 to co mp ensate for thi s cha nge.
4.
OPERATION
4.1 General
A four wire circuit uses two pairs of wires, one pair for talking in
5
one direction and th e ot her pair for the ot her directio n . Repeaters are
us uall y in sta ll ed at t he terminals and between at regular interva ls where
ever possible. The gain s of the int erm ed ia te r epeate rs make up for the
loss of the lin e prece din g each one. In the case f the terminal repeaters,
one sid e is co nn ec ted through a hy brid coil a rra nge m ent o th at tran smi ion ca n take p lace in either direction from the sw itchboard. The los
fr eq uency characteristic of the lin e is co m pensated for by the eq ua lizer
except in case of the amp lifter of the terminal repeate rs ·endin g into t he
lin e, in whi ch case the gain fr eque ncy cha racteri stic is adjusted to be Aat
I ecause the succee din g line is eq uali zed in the next r epeate r on the line.
Fig. 7a s hows sc hema ti call y a four -w ire circuit eq ui pped with r epeater s.
Whi le the lengt h of the cal le I etwcen repeater s may vary, this ar ran ge ment s hows 15 mil e of British fie ld quad cab le, which i the maximum leng th of thi · type of ca bl e that ca n be eq uali zed up to 10 K. C.
with th e avail ab le repeater gain. E qu a li zat ion is prov id ed for 7y;; a nd
15 miles of thi s cab le, the proper cho ice of which w ill g iv e a satisfactory
co mpro mi se eq ua li zation for any t-eq uir ed lengt h up t 15 mil es.
4-2 Power Connection
Wh en the repea ters wit h power units are in stall ed a t the spac in g
determin ed upon, they may be placed in operati on by co nn ectin g power
fro m th e main s or a 12 vo lt battery to the power uni t. If the mains are
used , a power cable w ith p lu g and socket connecto r, as how n in F ig . 13,
is provided to co nn ect between the main s o utlet a nd to a plu g mount ed
on the power unit ma rk ed A. C. MAIN . If the battery is used, it i
co nn ected to the termina ls marked 12 V BAT. with the 1 o larity as in lica ted. The current drain s for th ese met hods of upplyin g power a re a.
foll ow· :
Powe1' SuptJL')'
A. C. (Lin e)
A. C. (Line)
Vo ltage
Cu.n-e·nl
110 m iII iam peres
110
220
55 milli ampe re ·
Battery
12
1 a mper e
Office Battery
24
150 m iII i a m peres
Office Battery
130
20 milli a mp er es
If th e repeater unit and powe r unit a r e tn th e case, they h ave been
conn ected by a cabl e, with sock ets on each end, before mo untin g in the
case, so that power w ill be s up pli ed to the tube · by ope ratin g the power
switch marked MAIN OFF BAT to MAIN or BAT, dependino· n
the so urce of the power. I£ th e units are relay rack mo unted, the co nnec tions between th em ·hould be made by means of this s ket end e I
cabl e before closing the power sw itc h. Befo re cl osing the sw itch to the
MAINS sid e, th e sw itch marked M AI S VOLTAGE sho uld be ad ju sted to a point w ithin the ra nge of th e s upply vo ltage in ord er to pr vent hi o-b vo ltages wh ich w ou ld occur if th e switch was on a low vo ltage
poin t wh en hi g her suppl y vo ltages are used. A screw driv er o r co in i ·
req uired fo r makin g th is adjustment in ord er that once made there is less
da nge r of it bein g accidentall y chan ged.
(\
l
If the repeater is located where it can be operated from the ce ntral
office batteries, the spare ocket prov ided for that purpose should be
wired, as show n in Fig. 12, and p lu gged in to the receptacle on the repeater unit.
W ith power co nn ected to t he repeater uni t it shoul d operate sat isfacto ril y. I-:l.owever, if the means a re avail ab le, it is desirab le to make a
ga in test before conn ectin g it to the line.
4.3 Line Connections
The sw itches marked 1 and 2 shou ld be operated to g ive the required imp edance. Fo r a terminal repeater, Sl should be set at 600 a nd
S2 at 300 for the cab le or to 1200 if the line imp edance is app roxim ately
th at va lu e. For a n in term ed iate repeater both Sl a nd S2 should be set
at· 300 or 1200, w hichever more nearly app roaches t he line im pedance.
The co nn ection: between the cab le a nd repeater at eac h point are
shown in F ig . 13 for both the term in al and in termed iate repeate rs. The
co nn ect ions of the 1 airs f the quad to the repeaters may be determined
by talkin g tests between ad jace nt repeaters. T he pairs, identified as in co min g in eit her direction, shou ld be connected to the two termin als
marked A IN a nd B IN between them and those id entifi ed as outgoin g
hould be co nn ected to termin als marked A OUT and B OUT between
t hem. ln the case of a term in a l repeater, the pair lead in g from the switchboa rd should be co nn ected to the term in als marked 2-W between t hem.
4.4 Circuit Operation
W it h the. e connections made for each repeater the ·irc ui t is ready
for " linin g up ," which is done by ftrst settin o· the equalize r in either direction to co rrespond to the kn own length of cab le preceding the repeater except in th e case of the sendin o· sid e of th e t erminal repeater
w hi ch is a lways set on step 1 (A. at gain ). T hi s being clo ne, the p roper
gain for eac h repeater may be determ in ed by sendin g a milliwatt of 1000
c.p.s. tone from the two-wire side of first one and then the oth er terminal
repeater a nd ad ju stin g the gain of the successive rep eaters, w ith the
LEVEL sw itch cl sed in the proper direction, until the neon lamp just
g lows, except that t he gain of the receiv ing sid e of tf1e distant term in al
repeater s hould be ad justed to give th e requ ired net loss as determ in ed,
wherev er possil le, by mean of an overall transmission measuremen t.
T he minimum net loss is deter min ed by the balance of the terminatin g
circuit again t 600 ohm :, a point be low which the circuit wou ld tend to
sin g .
4.5 Monitoring and Talking
In or ler to monitor in either direction a telep hone set or monitorin g
receive r ( not furnished with the repeater) shou lei be conn ected between
eit her the terminal A orB and the middle term in al or between A a nd B
for both direct ions. In order to talk on the line in either direction, a telephone se t shoul d be con nected to the term in als A and B and switch
marked TALK thrown to A r B the direction req uired. See Fig. 14.
7
4.6 Signalling
If it is required to sig na l wi th 20 c. p. s. on th e phanto m, th e terminal s
A I N and A OUT of th e pairs marked PH may be co nn ec ted and also
B I N and B OUT of th e sa me pairs, or for cross ph antomin g A I N is
conn ec ted to B I N, and A OUT is connected t B O U T . Th e cross
phantoming conn ec li ons are preferable becau se it breaks up a possibl e
crosstalk couplin g pat h a round t he tw o amplifi ers of the repeater.
5.
PARTS LIST
5.1 Telephone Repeater TP-7
Th e T eleph one R epea ter TP-7 co n ists of:
Part
No.
N ame
W 93-22
T eleph one R epeater Unit
W93-23
Pow er U nit
W 93-21
O uter Case E quipped with Spares
W 93-11
A. C. Main s Power Cabl e
W 93-12
Curren t Supply Cabl e
5.2
Part
No .
W93-22
On Jte·m
W32-2
W44-2
W33-1
W43-18
W42-7
W43-9
W28-3
W28-S
W28-4
W43-ll
W 43-24
W1 9-9
W17-1
W1 9-3
W 93-8
W20-7
W20-8
W93-10
W93-9
W27-1
Telephone Repeater Unit
*Ma1·/~ing
S l, S3
S2
ss
S4
N ame
Panel
Chassis
Tub e Cover P late
Tub e Bracket
Du st Cover
Moun ting Bracket
Bindin g P o t Mo untin g Strip for Lin e onn ections
Bindin g Post Mountin g S trip f r Monitorin g
T er minals
Bind ing Pos t Mountin g trip for " P I-T." T erminal s
I'"esis t r Mountin g Bracket for P art W30-ll R ig ht
Hand
R esisto r Mountin g B racket for P art W30-ll L eft
H and
Plug (}or current supply)
Tub e Socket
I anel Mountin g Socket for Neon L amp
L a mp Cap
4 P ole- 2 Position Sw itch
5 ·1 o le- 3 J osition Switch
T a lkin g Key
L evel Indicator K ey
Bindin g l os ts ~ " H ead
8
Part
*Ma,r king
No.
On Item
W27-3
W26- l
W30-ll
W30-10
W7-2
W72-1
W72-5
WS2-6
W49-8
W43-12
W43-8
W15-6
WlS-4
W14-2
W15-3
W3-10
W3-10
WS -1
W3-ll
W3-4
W 8-4
W 8-4
W 8-4
W8-4
W 8- 10
W 8- l0
W8-8
W 8-14
W 8- 13
W 8- 18
W 8- 17
W 8-6
W 8-7
W 8-12
W 8-16
W 8-15
W8-19
W8-9
W 8-9
W 8- l1
W 8-2
W52-9
WS0-4
W43-13
R13
VT 198A
T2
Tl
EQ
T3
C3
C4
C7
C5 C6 C8
C9
R5
R6
R14
R22
R10
Rll
R12
RlS
R1 6
R19
R l8
R1
R2
R3
R4
R17
R21
R8
R9
R7
R20
Nam e
Bindin g Posts ~ " Head
P ointer K nob
Re sistor Mountin g for 12 R esi to rs
R e: isto r Mountin g for 4 Resislors
Volum e ontrol 250,000 O hm
Ne n Lamp
Vac uum Tube Type 6G6-G
Vo lum e Co ntrol Groundin g Clamp
P lu g Support
Cond enser Bracket
Resisto r Mo untin g Bracket for l)arl \i\130- 10
O utp ut Transfo rm er
Inpu t T ransform er
Eq uali ze r
Leve l Indicator Tran sform er
Co nden ser 2 Mfd.
oncl ense r 2 Mfd.
Con lense r 0.01 Mfd.
Cond ense r Block 0. 5- 0. 5 - 0.5 Mfcl.
Co nd enser 0.0002 Mfcl.
Re sistor 600 O hm, ~ W a lt
Resistor 600 O hm , ~ Watt
Resistor 600 Ohm , ~ Wat t
Resistor 600 O hm , 0 W att
Resistor 510 O hm , 0 W att
Resisto r 510 Ohm, 0 Watt
Re ·isto r 82 O hm , ~ Watt
Resistor 11 ,300 O hm , ~ W att
Resistor 6200 O hm , ~ W att
Resisto r 360,000 O hm , 0 W alt
Resi: tor 43,000 O hm, 0 W a lt
Res istor 10 O hm , 0 W att
Re sisto r 56 O hm , 7~ Watt
R esistor 5 00 Ohm , ~ Watl
] esistor 27,000 O hm , ~ Watl
Resi ·tor 20,000 O hm , 0 Watt
h.esis tor 4700 O hm , 1 Watt
R esisto r 160 O hm, 0 W a tt
Resistor 160 O hm , 0 Watt
Resis tor 1000 O hm , ~ W att
Resistor 430 Ohm, 0 W att
10-32 Stud
Cab le Clamp
Bracket for Vo lum e Control
9
Part
No.
*Marking
On Item
W 59-21
Name
Panel Bearing for )!,i." Shaft
5.3
W93-23
W32-3
W44-l
W42-5
W49-S
WS0-5
W43-8
W49-6
WlS-9
T
W12-2
L4
W12-1
L3
22D0479 RECT-1
W3-7
C17
W3-S
CIS
W3-22 C12 C13 Cl4
W3-6
ClO
W2-2
Cll
WS-2
Cl 6
W2-3
W8-15
R26
W8-15
R27
W8-21
R24
W8-20
R23
Wll -2
VIB-1
W17-3
W20-6
S6
W20-S
S7
W19-7
Wl9-9
W79-S
W79-4
W17-6
W28-6
W27-4
W 60-4
W30-10
W52-9
W52-17
W43-10
W43-22
Power Unit
Panel
·Chassis
Dust Cover
Mounting F late
Collar
Resistor Mountin g Brac ket
P lu g Mounting pacer
Power Tra nsform er
Battery Filter Choke
Filter Choke Assemb ly
Rectifier
Conden se r Block
Co nd enser 0.05 Mfd 1000 D. . W. V.
Conden ser Block 0.001- 0.001 - 0.001 Mfd.
Co ndenser .05 Mfd. 400 D . C. W. V.
Condenser E lect rolyti c 1000 Mfds.
Co nd enser 0.1 Mfd.
Wafer for Mountin g E lec trolytic Co nden ser
Resistor 20,000 Ohm, 0 Watt
Resi stor 20,000 Ohm, 0 W a tt
Re sistor 51,000 O hm , 1 Watt
Resi stor 47,000 O hm , 1 Watt
Vibrator- 12 Volt D . C. 100 c.p.s.
Socket for Vibrator- 4 Prong
Switch-4] ole- Doub le Throw
Vo ltage Ad ju stin g Swit ch
Flush Type P lu g
Plug 8 Condu cto r
Fuse 0.5 Ampere
Fuse 2.0 Ampe re
Fuse Holder
Binding Post Mountin g Strip
Rubb er Cove red Binding Post
Vibrator Clip
H.esistor Mtg. for 4 Res isto rs
Stud #6-32
Stud # 10-32
Chassis Mounting Bracket
Cond enser Bracket
10
Part
No.
*Mar /ling
On It em
W93-21
5.4
W 93- 13
W70-5
W43-2 1
W17- l
W l 7-4
W72-5
W ll -2
WS0-7
W 19- ll
W 19-6
W 60-5
W79-5
W79-4
W63-9
W 63-8
WS9- 14
W 62-l
VT 198A
V l B-1
5.5
W93-ll
Name
Outer Case Equipped with Spares
Outer Case
Strap
pare T ube and V ibrator B racket
Tube Socket
V ibrator Socket
Vacuum Tube 6G6-G
V ibrator
Spare P lu g Clamp
Central Office Battery Cab le ocke t
Extension Corel onn ector
F use Cli p
F use 0.5 Amp ere
F use 2 Amp ere
Operation Label
Schemati c Label
Escutcheon ] in # 18 x :J.i"
Instruction Book
A . C. Mains Power Cable
Part
No.
Name
Conn ecto r Socket
A . . L in e P lu g
2 Co nductor F lexible Co r I
F ibre Washer
W1 9-6
W19-8
W 64-98
W74- ll
5.6
W93-12
Current Supply Cable
Part
No.
W 65-3
Wl9-10
W42-6
Name
6 Condu ctor Cabl e
Socket 8 Condu cto r
Socket Cove r
*A or B s tamped on ite m after the par t nu mber de sig nates
or B.
ll
hann el A
:::
::5
12
"'
13
,,
.-:::,
I
'
._.__ .,_._.:.... ...... -IICl-..·rlfk' S'rt .f'ift'tfitd#
14
,, ~_..,,.,. _,.
..
I
,.
'l
15
16
li
18
19
,...-------~
15 MILE CABLE - -- --------,
--
---
N
C>
-TERMINAL REPEATER
INTERMEDIATE
REPEATER
FrG.
INTERMEDIATE
REPEATER
7a-Typica.l Four /!Vil·e Circu.it
TERMINAL REPEATER
HYBRID ARRANGEMENT
, - - - - - - -- - - - - - - - - - - - - - - ---------..,
I
!
AMPLIFIER A
I
I
I
I
Hl~l~:r:
8
I
lA
~~
[~
IPH
l o--
: 8 OUT
I
I
I
r
4 W
300 IN
A
OUT
PH
<>---:l.
,_:;;
I --r-
=r
-
I Ll
I B IN II
L---------------------------------J
2 WIRE 600 OHM AND 4 WIRE 300 OHM SETTINGS
4 WIRE 1200 OHM SETTINGS
""
I
I
--- - - --------------- -----,------i
I
1~1
4WI
' ,,
~
3 00 OUT
9
~~I~IL:
AMPLIFIER
A
AMPLIFIER
B
4
Ji~IE:
~
"""'II :J
,
4w
4W
300 IN
L80UT
_____ _3_________ _ _________ _ _____ J
4 WIRE 300 OHM SETT IN GS
LT. & R.M.
FIG.
7b-Transfonner Co nuections at the Various l111pedance Switch Positious
i
8
7
VARIABLE
EQUALIZER
SEE.
N
N
11300.....
6
12V
+IIOV
+ 130V
~~~
Errata:
.5 Mf. condenser in anode circuit of
V lA connects to ea rth in stead of
cathode.
F rc. 8-Simplified Sche'lllatic Diu,gram of A m plifier
I . T.&R.M.
T2A
TIA
!Jrf~~--=-~L~F::~--~-~
2
, ~o----..' ·~
~iltJ
I
I
-
~ ~
Z
EQUALIZER
I
:
FIG.8
I
AND
SEE
------ -
S·l
pos.
I - 2W (;OOu...J
"Z.·4W
300~
3 -4 W
1'2.00u.l
---
~c, _
__ _ _
POS.
_j
iE:
I
I~ I
I
4
'
~~
'"'=
I
I
~
A~O~TJ
5•2
z
5·2
I-4W 300.....2-4W I"Z.OOu.J
.N....,
3
0
0
Ill
S-IN
.4
~
2
Frc. 9-Coune-ct ions fo·r Imp edance Switch.es S -1 and S-2
P OS.I
7
POS. 2
8
~00 ...
10
~~r
l
1 i( ···- ~~ooo!...,.J I
I
~lH'l
POS.3
o
-~
-
LGr-
, •••
"'
"'
~
1["
9
r
...."-'
10
[
POSITION I. FLAT GAIN
*
POSITION 2 . EQUALIZATION FOR 7-21 MI. CABLE
*
POSITION 3 . EQUAL! ZATION FOR 15 MI. CABLE
*BRIT. FIELD QUAD. CABLE NON LOADED
I.T.&.R.M.
FIG.
10-Circuits of Equali:::ation for Each Position of Switch
......
......
S-6
8
LEFT AC-RIGHT BAT.
0
.5 AMP
7
0 +130
MAINS
3
0
v
0
~? ~ +IIOV
u
I
0
t-
-t
1
~+IIOV
I
~
3
""'
J
0\
2
12V
:L·-2--gI
L
-4--s---6--7--~-
---------
2 4V
SPARE SOCKET
v
1
I
_ _ _ _ _ _ _ _ _ _J
130V
- 1111+ -1111111 +
POWER CONNECTIONS WHEN
OFFICE BATTERI ES ARE USED
":'X-_CENTRAL OFFICE GROUND
Frc. 12-Schematic of Powe-r Unit
12
I. T. & R.M
@'
CONNECTIONS FOR INTERMEDIATE
REPEATER & LINE SIDE OF
0
TERMINAL REPEATER
BRIT. FIELD QUAD
CABLE .
PAIRS 1-3
. 2-4
·~~· '"" 0 0 0 ~· :_~.
·o · D ·· · · ·· ··j ... [·· · ·· · ··j o .:: o.:.
.. ~ . 0 [
0
0
1200
.•
.... .
r- .
(Q· A
A 100
1200
6
S-2
S-1
-~~
•3
B
[Q·B
-~-
0 ·0
"'
"
0
VIB RAT OR
. .. ,....
~:;"~
0 0
A . C MAINS
~
~ ~·~®00
e
<@)
MA.INS VOLTAGE
~
0
""
=
!---------
MAINS
OFF
BAT.
0+
12 V BAT.
0 -
BAT.
MAINS
$O<;KtT FOR A . C . MAINS
ONPANEL
A
6 ..-T.
~UC. I~~
~ ~
A. C . LINt: PLUG
POWER CABLE
I. T .& R-oM.
FrG. 13-Panels for Repeater Showing Cable Co1111ec tions
I'
....__/
t '
,....
®
4-W
A-IN
®
To sw.
~~
SEE FIG. 9
I
3
TIA
~
1
---<j ~4 I
2-W
r;
I
I
~----:::MP~F~; A--
0
I
1.
I
AND
1
I
---
EQUAL! ZE R
SEE
FIG.8
T2A
I_ :=~~;..+.--~~=:!~
01
I
t
I
I
L ___________ _J
I '-- 43
I
r
<>-i_ _ ____;,_AJ
I'--'<~>-+-----~
®
4-W
@A-IN
®
PH
N
00
®
B-OUT
1
A
3
I I ---
I 51
2
I
>
4
I~ ~L€fl---~·~FIG~n___ j
0
2
4·W
Ji[J~---AMPLIFIER ~---~ ~~'
8-0UT
I
AND
EQUAL! ZER--
ul w_
I
I
TALK
I
I
I
B·IN
0
EEt. . .,
3
sw.
52
TO
TIB
1
1
1
1
®
:MON·B
FIG.
r-1 ~ r-l •
wP~rJFt
~®
MON-A
14--Connectio11s for Talking mrd Monitoring
0
PH
®
B-IN
B-=-~--A
,.f-, ,. f-o,
A-DUT
1
1 .1
"'
Errata:
C6A and C6B condensers should return to earth i. e. terminal 3 on the
condenser block connects to earth
and terminal 5 to cathode. In Fig.
B-R2B should be R21B.
FIG. A
SPARE PARTS IN COVER
4-W
A·OUT
2· 6GV-G VACUUM TUBE5
1-WII-2 VlaRATOR.
1- 2~·130 V. BATTERY PLUG
I - SPARE LINE C.O)oo.INECTOR F'LUG
I· 2 A•.•t:> F'U~E
1 - -5 ~ t "'P F US E
VACUUM TUBE DATA
C..Ol.II'L
C.OOE
5G C.OOE
~~ !0-<i
6 G CD·G
VT·i9&A
VI B
V 2A
V 28
c;. ~ ~-G
c;. G c;.·G
VT·I98A
VT·i 9&A
VIA
VT·t96A
NOTE~
T
INDICATES CONNECTIONS TO CHAS515
I - L I A , L2A, C lA
& C2A ARE
A~5EMBLED
IN
A CASE WITH TERMINAl.$ A!. SHOWN;
SI MILAFU..Y L1 6 , L2B ,C.IB,& C26 .
PO~
PH
t -4w~-
2-4W
1'200-
"'
•nA
ARE A~SEMBLED IN
C. AN WITH TERMINALS AS SoHOWN. 51 MIL-
till
. II
\0
2- COILS MARKED
ONE CASE;SIMI L ARLY F"OR •TIS" COILS.
3· CONOEHSESZ C5A,CG-A& C&A ARE IN 5AME
ARLV <:.58, CCOB I.
1'1
'('N
c.ee .
FIG.B
POWER CONNECTIONS WHEN OFFICE
B.ATTERJE~
V2A
VIA
3
~~ol
I
AQE USED
VI B
~
V2 B
~ii
~ ~ ~~,;:'r
«kd~~~~~
4
'
I
I
I
I
I
I
1
6
II
I
oa
7
I
I
1
-----'---l- -_j
1+130 V
I
I+ n ov
I
AC
I ,....
I
I
I
I +IIOV
iI
II
.-
1
Il ,z v
I
I
I
SIGNAL CORPS U.S.ARMY
TELEPHONE REPEATER TP · 7
i-
I
L __ _j
FI G.
15
~-=-
OFFIC.t. GR0Uh0
SCHEMATIC
/. T.& T. 103-A TELEPHONE REPEATER
lnferuotional Tefeplrotte & R~dio ltlf_g. Corp.
....
NOTES
NOTES