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Tp-7 Instruction Bulletin

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August 2018
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r . , ,-. . - ' ..-. ,;:·; ·; .·- I ··,·, .{ ......-,. \: .'}f '---:. ! \ ' . . ~ ~ ••· ' 111-'..!_..,.,,;..;: ...-.. ~:-U;. ..... ' ·• , ~~ ~.<-I -~ '- . . r··· . '.. I I i..:'t --~ INSTRUCTION BULLETIN FOR TELEPHONE REPEATER-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 ----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-

Tp-7 Instruction Bulletin

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