CG. O’D, ISELIN rae) KN =a NP24(P-17.1) (D74.) (WSL /WFS) 15 September 1946 U. S. NAVY UNDERWATER SOUND LABORATORY FORT TRUMBULL, NEW LONDON, CONNECTICUT MAINTENANCE MANUAL FOR THE EXPERIMENTAL LONG DISTANCE SOUND RANGING EQUIPMENT (SOFAR) USL REPORT NO. 61 by W. S. Latham and We F. Saars | CC | efQ RY | | nbs bol Approved for Distribution val j rN 4 / eee usr () of Lo Non = de Ls Lie ee: ey Jgyn M. Ide, Technical Director M, Ke Clementson, Commander, US Director Ney ’ } NaA¥Y UNDERWATER SOUND LABORATORY FHIVTR 7 ' ne TRUMBULL, NEw LONDCS JNDOS, CONNZCTICUT Serial: 360(R) 6 November 1924, To: Distribution List Subj: MMaintas : nance Manual for the Experi I i gare ae ene: eect (ose eiice a Long Distance anging Equipme SOFaR}," USL Repos as of 15 September 1946, fs ea pes od ry .¢) 3 rs ¢ oP fe 4) oO es ° ¢ © oL es D ty o with ag enclesure 1 for wh Moet hb CLEMLN TSON DIRLCTOR Enel: (Hiv) 1, Subj. Report ‘oa oy Be Nae a 7 . :@25 : on +4 O ° ie oe ‘ 2 y a a, BOY, , ? SRO pean RL ! Nye De cele ’ i A iB set Dine 4 > ee rie ~ cr : ° 5 NOM oo7e3? i i i WML M o 0301 ma ia cc a ys a ‘alepdeld sae Seunorinode: He: aot! Le bevel ea akc ear : : A oe paul: SIChs Fite re Ci Ae) - a aah [5h ma ag! 1 5 chee) isco iy ; ; see i Sane ine Soa ae Kee) ce ces < wee \ i que Saueolene fe Noe wih be! De Soy Rei PTAs FOE i . ey = | 1 Na a - a Ui uf ADE is oo ibis : - POTOUATO” i, ; ; * : i i 3 ; st : a it oe) POWER LASS DISTRIBUTION LIST Chief, ONR (5) ONR Patents Division, New York Director NRL (2) BuShips, Code 938 (4) v w 94,0 ( 2) yw Director WHOL Director USNEL Bp ; ‘ kay pape 4 hats int REA ELE Basil Pitts (7, © © « e WERE. 6 6 ¢ 8 go 8 OG ac Servicing’, ° Oo +e QP ONL Ia an 40. o Ss oS MONITOR AMPLIFIER AND LOUDSPEAKER. ’ AUTOMATIC SWITCHING UNIT. » Qperabvions vow emis) o so 2 « & Sensitivity Adjustment ..... Resetting.) cei eioonicits © s eo Servilcine ween etic ts ema ee co GRAPHIC LEVEL RECORDERS... .» « Descriptions . « o « « » « 2 o © Explanation of Operation . . => » Speed Controls . . > « o » « « » Inserting Paper Tape . .. . « « 5 o s ° a ° oe o 9 ) ° ° ° 3 ° s oe 2 c) Protective Relay . » os o 2 0 » © + © « Changing the Signal Input Potentiometer. Switch Box and Amplifier . . .« o Sensitivity Adjustment . ... s Checking for Erratic Behavior. . Maintenances oc). se) 6 o 1 o 0 © Basic Construction and Operation TIME INDEXING MECHANISM . . oo « « Recorder as Received . .o » « 3 Altered Recorder . . o « o e Timing Stylus Mechanism. . » Bet tome vaewe. ia gaia ol oo 44) )s ILC VELOW omtol ciifoy lo Mken\tar Niel! ioulio @ ° ° e © 2 ° o o 2 ° ° ° o ° ° ° Ce ee OO 2 o c ° 9 a SON ¢)a OF Ole G 2 o. mys 6 O65 Oo oO ° 2 w a re) ° ° e Cr ee « s o 6 OF Fe (Ga 018 Of 8S (OF Ja co e © © 2© © 8 © a ° © °c s s ° e 9 6. @. oO. (esq; 40 Co =_6- “oe to 2 a qo 68 ° e ° 3 ° a Cy ths Che) Ol Ge Lie OG a v ° ° 2 (ep Ke FR I E ARBDOVENEE fF eH ooo i ane ae ‘ ct ey eae by rhe Row, na 4 he 2k Yo 7 a BM “4 gee & = eo 6 + n & ed io. & 3 a) i 74, = Ss & « 3s 4 yt he. * nee fe A ty © “ “4 Lae 5 = ‘ S ae e Bn nN ra Ef * 4 car ae ‘ “an | ike : 2 Sf teh 9 GAReuNg ESS BugseO Wega ev @ 7 sq 3 pe & * #8 & ‘ 7 A ae ¢ % Ww 6,8 ” e *€ a * » ee t . a a:°9 a ee aa) F » o “ * " i e « ® \:-s . TN a nh otha ar “aher eS ages sL0¥ saiclt Jig dO, Bows Oh é ¥ ees « «teases lenssed suger aa) be oi ve by eb et a ok adnamer: anon pert ‘ ; & aha xe gabe Lease cine pes, Feo eN a8 SE 55 VRS « on cS “akan ea + + o & ® a * . a yer AoLIsiTsO’ ZS nobtanas oe ae .. + 4 4 oLoxdheu's shen se 6g BET. TENSE ani dusen WOlOH Oriente nIEG edd, Sates Jak Bis mom” bic us & . » @ #8 > * > Ye ri oA Ube a, a MOLISiHEg "eit HOLE aq Pad WAG ay iteS Na vices once at ; \« [ows 8a 56 0gagen Laser boise a eae Saw endete sit E ps atk TABLE OF CONTENTS (cont. ) MAGNETIC TAPE RECORDERS . . s > 2 © » 2 o © » Location, Use, and Connections ,. . » = » » Distinction Between Mirrophone and Operations voy yes letolioy vy a! ea o's Tape Repair and Upkeep . « . o « » Caltron Q ° o 3 Q ° ° ° Servicing the Amplifier and Recorder . . . CHRONOMETER AND CODE SWITCH SHOT ARRIVAL TIME EVALUATOR OPERATOR'S MAINTENANCE. . . PREVENTIVE MAINTENANCE, . . INDEX | ° ° e 2 o 2 aco 30” 205)76 e ° ° ° ° os ce @ o ° SOME ono. i ey OO 26 27 Ce aA ee Lee eed ee pes U8 Sip” > i “ & Oe geeieiae Drs Pau ; DOS dem bags, > 2% noth ad bass eracKoreat non 300) cage ue Hs més > a6 2 6 ‘3 ee Oe 2 ¢ pesto 150% ¥ : < mS - Se ate > gee ein t $<, ) een bras vabsqemt 4 Bi aleeany ie < e Geae ca sebroicl bie 4oi: i Teal dnd Pabeg es 7 ; Vs 2s se # » ~ FF & BUS Se 2 ROTLiay a Co GiALS ia a | ; | a J 4 + Zt 7" a . ; BO cea Ane) hoary vin ay AOTALUAYG SIU anvEAsie 7 7 os : y fu ae ep 2 ’ a” . 2 \ e! ? * Ahi jj ua WP AL : ss - = va Fin aaa ay m he 1 tht a Dien) Bue a) ts ie) F ¢, *, a hia i ATi ae ANT, rec’ E c -_ ‘ ; Y - - i ‘ : : = a zs p 9 a - seat, List — FIGURES : 7 v. DC Power Supply 1 Recorder as Delivered © ‘iming Gea Mechanism if ing Styl Saas Mechanism nse of 1208 Teese nse of 124A Amplifier with Low pesauctes mueiines ' ee ' ai Peaeighes Bi fo 2 ERODE, SBE , = a if wT Aneta, pia). on : 7 > woke ag a sgt ies | a0 noe [set ea sent Pew toit 50 ope 7 We) ¢ fie eens nos! .on? oe i pede a ae “foal 3 “Prune Geoge ror Bese seat. ht tod ae sfsenocid ow? 26s "a ‘ _ Top roped level - WELY Spotl Loos? tosh ore. ‘Wel? well , ates ce 7 | sebroo9h Leus.t boat Beant iabH bas qodencno sO Sot? 7) ~hee es Wattefams ono Sit gail et _ P as + SOLSEIGAA ono? omit HOEY aon’ oan f _ | oy 4“egiefonk snot emit .woLl aodsou i wiggve 73 ROS asizifqas snot amvr . wig hates Tawall ISttiiqnA enol smi? poly Hoddey 7 1: F J) Saab entiors wing Sane tA _ . . Aiolt SmaoiLtG Srecne tc A wer) een” PERU eihon tee SleSmo St: A eel Ve sepia : YldGue: sere Ow WiiGue ssaoF SIPS well ef hexoviteG ag qohtoyel Loved airgexD ents gf enigdeusoimiy Adiv aghwoset GS \ nefesiisl este spin? to wot) Jaga a assnaral ep lyse gatnlt So webY oo Rec a the piaitpsl salves 4 paulmel te Wanye Syl oe - " ne r / nodadiant ant Devtand tones ae A PeRRsOnk reaps, ie aU Orr The othe mre teh qedLL1 send wot else VON ho Sencecsh goceuparh nee Mama, GOe0t5 ass eon zoasuaane _ mencisuod yonevosss Wold aviw ae thitame RAREST Perio en ZoNsupe Ts i Hebiouel sqat ntdomst enolyought Beltipay to ee Qonen psn “3 Ngo Tous vasT ofvonsall cowssSD Beh atocw 9 5. YOR OUP Sey “wontiai nh bas: so88 Linth teknoiredess fhyeys DASH e Ct ae mestisips Bas etvtlonA antivodies aitamodal te A Yanasoxe SOLtLLdmn ALS. YO neiliy enad rod Bing Oos Us 3ec aot YS EDOTy Meltiionk AISL tok 1 )2E4 Misa SCORE Gee SURE es oo aiperae i AOU eOE RTO: gi AROS asa eo iehod font = : 7 ser DA ea USL rs f aa eid amare) AGS pile . Bicomerostivary \540.\- °° gGuu Monod D0 alow . ee Assembly Block Diagram _ LIST OF SKETCHES ep : nd Output Wee aE ae of 1208 Amplifier ele G raphic Level Recorder via é rab tie2ts foph sho? a) unis) ag inws eat # Lorin aE se esc me Chote te vo i Rolie Sino} a int es: Aghe in dy ni: Sf Sill - piktecgis Sountisdtws hiegeahes aren: qos M Mee haved ede ae | =i ees . pooikioT i nth eee Poe TY Wd OR ne ie EOS SH. ma Ebeare oi front lyd _ RAL Mean Ulan’ Adnaa Ne Fate an a Ga gnos eo Tet 7 . | ; ae | : pi FD ace ‘t- 7 onieense a Se bot TESTE, SSEO- I FOS nt dimeHesell Seioint07G CL good Sink 7 Jdaaoruseen Psig Iles ct ysic Coase by) Liga’ BOREscc beccabes Sece-S60720 baa suage qviiosall Loved aiticeaD 1.5 6 otdngerio’ MAINTENSNCE MANUAL FOR THE ae LONG Dl DISTANCE SOU “SOUND ) RANGING 3 BQUIPMENT SCOPE 1. This report provides detailed instructions for performance tests and ~ _ maintenance work on the receiving, recording, and timing equipment of a station in an Air-Sea Reseue network, It supplements USL Report No. 55, ' Nixperimental Long Distance Sound Ranging Equipment (SOFAR) - Installation and Operating Notes." In addition, it provides technical data on the station components. INITIAL ALIGNMENT 2. Before the SOFAR equipment will Lonee reliably a number of performance tests must be made (see USL Report No. 55, paragraphs 26 and 27). ‘These tests are described in the following sections, each one of which also pro- vides the technical and maintenance data required for its part of the equip~ ment. It may be necessary to repeat these tests during daily operation when servicing of the station components is required or when a defective unit is replaced. The Maintenance Manual, together with electronic test equipment, should therefore be available to station personnel at all times, 3. Before undertaking the preliminary élienment, operating personnel should study Figs. 50 and 38 to familiarize themselves with the location and function of the station components. They should carefully note the system layout and the path of an incoming signal through.the receiver—amplifier to the recording and timing equipment. AMPLIFIER CHANNELS Description 4. Amplifier channels numbers 1 and 2 are located on the two. upper “shelves _of Rack 1 (Fig. 2). They are identical and each consists of a WE, 120B preamplifier (Fig. 39) working into a 40-db attenuator. The attenuators are controlled by knobs” on the left sides of the two upper front panels, one knob laveled CHANNEL NO. 1 VOLUMES and the cther labeled GHANNEY, No. 2 VOLUME, Each aapermaters is followed by a W.E. 121A line amplifier (Fig. 40). The amplifiers are shock-mounted and should float freely, In opera- _tion, one of the channels amplifies the signal from the hydrophone before it is applied to the recorders and the other channel is in stand~by, pode te ac ; 5 co : set p a. ae | eee 8 rian i “es eer f ce Ser : ee 1) 2 OBESE eweye = eae Ps cys Ay en are tse ake “gol pipe oat ng Bank AApEanfapd ooh lvon ak Robt th ab Penney orth ‘ ee onantio tay io 4sdnun « elds ten « BeeHT «(Taine Oe atic 2 aor) eEpee foliead sn0 Woes on xsiga ads “30 iia adi Aa'l ben: POLMsS ELtAS geatvo adees sia & Be to betripes Oe oe oe Bt 4 ey OVC we tht Waar end kala, A mit thw esvieeinertd sabes slide as 3 Soop Ec Lutes ee euots ET «ued cen: 5 Li mm desteny eee 2 ids rin eer Perk he in hi qe s *% Tor: . : : 7 2, | von y u CO OMG See ar mn peo : - my ne 3 PT me ona al | Wieg) ta ot hos pity SY = “ 2 ee ae 5 q if r ‘fF; ¥ > Ele ihe sealiceaged f ‘ es ‘ + tel va ¢ - rhe teva Cals tate A 3 at butseas a 5. net ao peer of ee ce Gontains five male Cannon receptacles labeled HYDROPH '0. “. @, etc. Five hydrophone circuits are per- Be eaby onhected to these receptacles by the hydrophone terminal strip located on the upper right-hand side of Reck 1 (Fig. 2). A protective cover which acts as a magnetic shield is provided for this terminal strip. On the front panel below the male Utes receptacles are two female Cannon ‘receptacles labeled CMAN 21, "0. 1 and CHANEL NO. 2. Jumpers connect these receptacles to the hydrophones, making it possible to connect any. one of the five hydrophones to either channel. 6.7 Between the nets and the female Cannon receptacles are two lever-action switches, one for each channel. These switches are spring-loaded to return automatically to their central positions. When centered, each switch connects the female Cannon receptacle below it to its channels when pushed up, it lifts the hydrophone from the channel input and replaces it with a 600-ohm terminating resistor which is used for self-noise measurements; and when pushed down it again lifts the hydrophone and Seiiee rs) the channel input to a set of binding post terminals on the panel labeled SiG. Gil’. IN. Since these switches automatically return to the center postion: a hydrophone is always connected to each channel unless one of the switches is actuated. Self-noise Measurements 7. Since self~noise, generated within the amplifier channel, may alter the Signal characteristic or mask the signal and prevent clear reception, it is necessary to measure each channel to determine that self—noise is at a minimum, This should be done as part of the initial alignment and should be repeated cach day, Sketch 1 illustrates the circuit to be used for the first step in this test. Remove the Cannon output plug from the 121A 0-10 db Attenua— tor Set at "oN - Sketch 1 ~ First Step in Self-Noise Measurement — amplifier (marked © r (EL 121 at the back of Rack 1, top panel, or OUTPUT aad NO. 2 CHANNEL ct, the back of panel 2 from the top). In its place connect a “yaeunm bane voltmeter terminated in 500 ohms and adjust the channel volume control to 0, Push the channel input switch for a " mS toa it) a ; ee ee Reb : % uy i. > ee. ofits fe Paneetin geet : / i SAGs deg fe Tare ‘Sie dOUED wate: tv axe te wate! A ipsie LALA ourongeree © arid ‘te BoLonagena4 reas op. soduann avedgoigeg A) S Bia) SSM ee G4 Sette din oy etan | wghiss Lentenedeldd Cov bratverehe SiaNa aksetnee nea eee * . AOL aienae Or Pah, ge te LOSE ane asad orci Roetiay ale ‘geatd fosed arAgaiy i: i. bia Sh * | ee Berge sts to eno yas Gapntios of side antes orice echt ent a 8 * Te ante Fanta ie qe Beet i 7 8 ‘J . - a - a eo foiven-retol oxy Eat EPlowiees Henk ae fees’ €d br afam “Bay Gruss ‘od Pebsol-aahaye pike ewtodies (seed? a fora (sue cod of ‘ egosmaige) dadtwa Hose seNsanGs pei. Sholessoq JS 2S “clansres ites “esti oe gu Detaag ‘stots et Rot Maia weled eloniqus%, hommes ‘siligaimies iita-boene dole Jb sensiqes Bas igual: tonoade aa men's pees oh io Siherevg ier bye pe ical, "pacenetios Woh beat, auton “gah he Wee 8 od, Thynt “Lorna, wile adendeoy bes anointed OAs ee tk eodotiws eigdid pond eee re a hee Tangy aad fd fait tyres a “¢ ‘bedesnna Brawls FP priar ortbeent 4 & eed ses amd ade ard, cilabis to bodevta@ uc seiod ing sit “he toe Beste pr D , a SIPs Ss fi —- A 7 ue pet Meola Fan pinciieto et hice oid a if Bese Tes S3 bets 7 ae ‘ ; ; 2 .ttaticoves setlo Jnetaw Daal taneterons / WY SEGe - Fa to 1 , ; P(e eal Bh Belon~-Eles va oat etal og é Kesnado- dose S55 &: Siete pas Ics tis teleted es 3. 5 desi #8 Ey Di) ci Cees t Doe ed aay i J ep dag stam MP ade eae doses big AEST etiimotl adlg gdasue Cancer: ede se yore A gdavk meee gs ‘qe rié a # : ne Pee er nant fz : \ ra ns ee -, § secre Hee net 2 Fe PM Fete. 28 e052 7 es ‘ei aad Medal og Se ag ny > RESE ‘2 4084 11] ;? | : oa ia 0 i derbetcmrteouinen anon ttle HAN rte =a vis ‘ 7 . - } Nate ys hon teenie mm yt eee ee eee ae eee 7 aR gk Oe a , ee ye nee ‘ GZS 2 te 4 : rs oa a5 Fei kG a : shane tiscsll celowLies Na-cese decit = f isdeney G08 gi 40Se Soe kaniealsy ce . be ; DOPE {aod edt meat S Tincqoto Msad oases. | bas eh bia Amdo OVC nh betacinte: colaqgslyy wes myeost B Rigseens pense. ef “on fogiws Jsugnt fosasis ir ra ry J) the channel under test to 600 2 Tupi, The voltmeter: should then read at least ,056 volts, or 25 db below 1 volt, If this value is not obtained noise is either being generated within the channel eck or is being picked up from some external source, Pe Ses | ed, MOSES en remove the rear end plate from the 121A amplifier chassis of the channel under test and disconnect the input connections, _ which are the right-hand red and blue leads. Bridge a 500-ohm resistor across the input terminals, as shown in Sketch 2, The voltmeter should be _300 Sketch 2 - Second Step in Self-Noise Measurement left connected as in Sketch 1. The meter will now read the noise level of the 121A amplifier alone. This should be at least .008 volts, or 42 db below 1 volt. 9, If the 121A amplifier is not the source of the noise the 120B preamplifier and the 40-db Daven potentiometer should be checked; Sketch 3 illustrates 120B Switch on aed O10 db : Tsao Front Panel set at uO Sketch 3 - Third Step in Self-Noise Measurement ae Les e ay : 7 aay pene pe aes don KSLoy witlt : \\ Soaked Hethed Sphere pina AL ae i % ee ab AS) Fon Ley sowie sited, bi eis aad fomnaisiens niqdiaappdente¢ bapodig Me Fae fants 33 ABE adhe tans arte ag? tae patty ‘Pesvaen aid ovanit ye uae ores duolsesdnoe anol afd Sosnkedelth bak Jaed cso is arg ‘Sie Fo sodvtear plea Oe ayoqbiss "shai sit? pas agit penis ee ae od alnode veodana hor aa ok itsdene ale: coi ee yesentaws up ee aa z a “ae anit ae: coe of ry ota eaten Cit rena eR ~ ot A Ce a ee eh “<> 4 ~ A A RN comet ty, be a, | NGtinesyesel seroteliog gf cbtc hnoow - 5 vadeyee "Pose 7el onion Sct Dea vodr Lie ovemipee |i 92sie mt eZ Ra I SES.UGN , BOG. JaHSL NR SG Siuons atiey . esols soPEkiiia oi leet ifomeoud 20S! sizes ‘i ; Bi steRies cry, eS hohe oy gon-ch rect liana een lott OY epusiiaoiil’® © 5 id) BE et isjose. -betosste. ad Bigete sac sed Minato tg vag abedA'eed io j > =a s iy sills nate ae nee Females ce - vy ‘ee r an 7 iH Yeh > eh ean i oF ia 10% oman aceabeaee be i 1 | i a hl ed j Cac 4 ' j ‘ [3 (eieew x { Cri 4 Csi hier ary } Pe ee | i y ~ - = - : earn gs Yi Perot Ese oe PLE, sagk get 4 ae dee Pa I 5 : Shs bem. “Push ae proper channel ae Al position, With the channel volume control meter should read at least 00008 volts or 82 ’ ciate in Self-Noise Measurement . Caen : Pe ‘ Po 1 Fs - { ek 1 ne a ae eet ground to obtain minimam all three racks. Note Matis 39) that an RF. Ss ‘ores tts aa ee “aden ae ig od o¢ ebsel dignt edt tro’ 5 aodontie : : 7 ‘ oq i} 7 ia odanlad ts: ai ei! iasdcoe and dort: abs: sateave ts: rome apie ae ‘Bre “aot ed? gihveas's teak. edo ik Jewode 6a “Aodiged up ene. a iy) ae 7 Winaapieeac zee meme sli siecet eng vaodsured tA db. ee cd le Be Le “80 3a “He oe j i j : : a } Z a) : on ee 5, ; : ; | x SO ete nen mom A emmy ai { mks on, 7 7 an i ; res od oe - me - 3 . ity xg , ocr rae nS voce *S HW re pone pene ema oie ane ‘ae ION 0a al 5) ae se 7 + i is 7 +4 . * th nr b oy cee amo sre see os foRa-ales Beaade Apruct = ab gods o . : beta \ my bnatdtel) sheet siadue |r A gktiesninsR he t nos 22. “tt gia HOSE _ Wen et aetendion std wulone bosepongeiny oss fodw .(absel ole “s oe Bear binote +z seit lomsotsy ‘Boss sie ho Fu I5HG act 220998 = Barter woolen ob S3 ig ePahed) se : _ yilavesc Lifts gouge es setae fms Weanbdo oti a: Jxaaaug Bk ene a ; Sldsscsote Cee ae cotcw so STs: oe devon ait , ziti lumsety SOS eld wh) +f eUTIEG eTocs ligne) elit qa ronows Me pertoico 85 Olvods syste ~Qyoln fer nud 6: 3 \ od qisareogn of oss yan at useanoad: Ersogs of abfeide’ oldie ordus sumintn afsvda of bosone Isaxsaxne Boos 6 i £ z s » az! deh HOSS Mowe Stree Daum 82 Fe PSePGEe Sed ne teie (CE ai) edoweas aloes ade Ue Savory olden oats sake - -> Aid & deit boa ues ROSriLn BOnBUpe deoithes BBG EIS On bebsvorng, need “yoneupeti~wol musixem misdde og fees seed aad (iol) remmorecats a Atagak oa S- etn Lamon sid bag cb SF el usitfiqna sigs 36 nas, Linievo fenton: BUT, » ,eenogest sOOsOY eas ionaha az is eg Renee =, Pe era 12, Fig. 30 shows the frequency response of the 120B emplifier, Its tube complement is as follows: 120B Amplifier: One 6C6, replaceable with type 1603 or 77 s One 1620, replaceable with type mo or W.E. type 348A Input and! Qutput Noise Voltages of 120B Amplifier 13. To determine the input and output noise voltages of the 120B pre- amplifier using a 121A amplifier and a vacuum tube voltmeter, ea the following procedure: (a) Set channel volume control at 0. (b) Connect a Ballantine or Hewlett-Packard vacuum tube voltmeter across the output socket of the 121A amplifier and place a 600-ohm terminating resistor across the meter terminals. (c) Determine the over-all gain of the 120B and the 121A amplifiers together. This should be between 106 and 108 db, (ad) Throw the past, input switch to ‘ {7 TERM and observe the voltmeter reading across the 121A Boch Evaluate this reading, using one volt as the reference point. (e) To determine the input noise to the 120B auplifier add the voltmeter reading to the actual gain of the system referred to one volt, (f) To determine the output noise of the 120B amplifier, subtract the voltmeter reading from the gain of the system referred to one volt. Sketch 5 is an illustrative example of the sort of readings to 600 Ams Channel Volume Set Front Panel at "or Over-all gain = 107 db Sketch 5 - Input and Qutput Noise Voltages of 120B Amplifier Meter reads 25 db below 5 1 volt ee st oar a tee, onasieatees, ro at | oti Se AAS one aH 0 i sg got tenes ae aad’ a 7 7 = a - aad GORC eit Re eee ace, a ‘bat igfiaial bd, lane ‘ott saoae vetomiloy a mS aan oo ASD 6 gohan” , , renin hosters as *2 ea ie sern smulov fonda oSe ts) teJemd Lov edit LUGS T Enetonted delved xo entinelisd © ‘gaennod id} nies000 6 eselg Dad stebtiitce AlSivedt 36° tevoog “Jugdne “eng AsuTO8 paletiaaed sagen. sig FePIe “OTe LEES faites tage mui sxoettgae jest pid ona GORE" and to fee , {hens ig aif) éiinedsd. tay \ ni SOL bite: aoe ayane ad) PLusda plat eae. mee eyisado on a 2 Od i od tive Pers Tenas: io did cer . epaibaen, 25se adaiave tngine RISE edd eeouss uctbsou wadnmdlom IRECQ aoneualen = tu ne Stev she Sapeu 7 oo eit bbs Pobtstous BOSS aiJ-od eeiom dick edd sotcsetab o ay 8nd ot beazeles msdeya et Zo séeg Ssudos of3 — neoesy rodnasEot a) ; ae ease sien ROSE ate to 98 ae ENQEUS aie animaed&b ot cay (eno og bexwisten madera edt Rownicsa ids mets peak sadam {ov 7B ord aantiiess LO IKOe and io siinmans cpidantanl, bk ae et @, Roeale am a az Ba a =e aewinytos 8 é ye is : ; el i a as ea ss } | H aa merry eet eet re ‘> att ar) ree | a ee oe er fe annie? Fonnsris TigSt as alae an VOL pies fi suey) . shaex.redok wetted db o& 7 Hiow Lf / to gayndfov setoll dugda0 bas. dyonh = et dod te th iqmeh Ost ~ fie be expected. In this case, the input noise = 107 db + 25 db = 132 db down, and the output noise = 107 db ~ 25 db = 82 db aa 121A Llifier 1h. ‘The 121A amplifiers are provided with 500-cycle low-pass filters to improve their signal-to-noise ratios, A 1500-cycle and a 200-cycle filter are included in the spare parts and may be substituted for the 500-cycle filter if operating conditions require a change. The installed filter is located on the right rear corner of each 121A amplifier, Its pass~band 4s stamped on the top, as 500 ¢.c L.P.F., ete. Figs, 29, 36 and 37 are response curves of the three filters. 15. The normal over-all gain for the 121A amplifier is 75 db and the normal undistorted output is approximately 20 volts. The tube complement is as follows: “121A amplifier : Two 1620's 2 One 6F6, replaceable with W.E. type 349A. Servicing 16, Extra precaution should be observed if the input tube of the 120B preamplifier (type 1603 or 6C6) requires replacément. It has been found that considerable variation in inherent noise level can be caused by tubes picked at random from stock. When replacing this tube, try several _ stock tubes, using the one giving the lowest noise reading, Use the test ‘circuit of Sketch 1, wetching the output meter for the lowest possible reading. Exercise care in replacing all other tubes as well. 17. If further servicing is necessary remove the cables connected to the amplifier (either the 120B or the 121A). All cables except the fila~’ ment leads can be reached by removing the rear end plate; the filament leads are reached by removing the front panel of the rack cabinet. ' Then take the entire chassis out of the Rack by removing the four nuts holding ‘the chassis and the Lord Mounts to the tray, The nuts are located under the tray. When the amplifier has beeh serviced and is replaced make certain that the cables do not interfere with the shock Seah and that the amplifier floats freely. Gain and Undistorted Output Measurements 18. At least once each week each channel should be checked for over-all gain and maximum undistorted voltage output. To do this a signal generator should be connected to the terminals on the top panel of Rack 1 marked SIG, GEN. IN. Pushing the proper channel control switch down will place the signal generator across the input of the channel under test. The signal “i at “Sa ‘SA or anne ban. era risce rig a ers a cae si ternwiely = Dp wy ae ened <8 ; Teeadi bhi Cid 4 Barts § aes . Se - . en May ali ef aH imei etayi paca Bie 6! Disp Macterg, | Cauvanie *y Senslega9 stig: i Bh ae es Rtasetixouigs in. 2 duo Posey tetsay | 7 ia c. * mat sauoliet ‘8 es _ fey iy es : a Oe os ' RICROL om , setae A “ieee ge wha wats eldaionicas ,475 a0 - om : a i : mr Ge ee | i a oe | 4 g vam oor er ‘to ‘sans ‘Bnaplé ‘Sid. st ‘bemhato: ad Eivore’ he bgume oy pa ae ‘River Nseq ean ates snonbaaliers eortupes Te8d to FOAL 142) Seaeeae ae RG boenad ed noo over Se lO smeesnt al. iittciaess aid vumzenas AMI ETSS CI godud ead miisete 9% Hig GAINS es. Hebe: Bal nS tap Thed ART Sul sof fac saehe peo dpired, atid gas so £09 i ardtaice dstyod she 0% aettan WM EWOVEES artiiuday lA e . iisw 25 endud norco ff5 gato: COT Wl eIs5 + Ga Detaayy noo) entiinss. Sad every ee en SL Moti lee glee. Son igeoxe BEL at a aa (ator oad BOSS silt brid To eehky (89. sriEE eat Sedaonetvorts | « _ . 7 ey > A, al wmbhegred ALSC edb SORE ait) ca" bs halal pc betas ogee at ee } sh : as bsetsal HS tern gon oh AQs a Mgnt tqas: =) feast fe OME bas HOSE ‘orld eh digas (Sa bidawom of ciodiwe ay enc Hla rr} eat boos ns isltw yincns off dadi o8 “idasrts May-T' edd Tt > pretiidoos odd To eikl sie Sorerolexd .’ PRIUS ehd sepsersoeb: yldewshpsnos sacs To iw woldeonice (A Jidy-Ol1 edd jetansds it beass gt DasoRinos< Ds, ald nia” Get ide Teistares3 seooiow ALF Rf signet srsbad enlov E.G. at) o2etlo7 . Bk wolazant eidebisy ody) pazdechos gh at Penton. poiareo7 Bete pR PATE SARIN FAS : ut ag iB. Be : : ba Y 6550) ty figiorn? oy ides ! 46 eves . Salnvol si, totetess mic. ory er .aviay: tevat me 4 os -ePHeeO ier on per elacsul of “te sbde tabi: rc ‘ Ales ot ke Pits fa FOV ede Wendi caer &. ond ot tie tab kohybennl dob ievei tale cosas ented loosening of the rectifier plates the noise can be remedied by tightening the bolt holding the plates together, CauTToN! Condensers having a total capacity of 12,000 microfarads are connected across the output of the 7-volt DC supply, Although these are low-voltage condensers, they nevertheless store considerable energy over a long period of operation. Therefore handle filament leads with care, even after the unit has been turned off for some time. TiMe® TONE AMPLIFIER Deseription 24, The time tone amplifier (Fig. 43) is the distribution center for the entire SOFAR receiving system, as can be seen in Pigs. 3 and 12, It is located on the third shelf from the top of Rack 1, The output of which- ever channel is in use is fed through the BUS VOLUME control to this amplifier and is then distributed from the system bus to the various recorder units by means of selective switching. 25. The time tone amplifier contains: (a) a 7 - . vre,”- a) (V-102 on Fig; 43) operates the index relay of the s low-speed recorder when switch 3.10] TO RECORDER is in either the BUS or the MIRROP, position. The first See (V-101 on Fig. 43) is energized by the chronometer when switch 5-101 TO RECORDER is in the BUS position, and by phe rectified 3-ke eal from the magnetic tape recorder when 5-LOL-is: in the !UR°OP. position. (f) A 1.5-ke low-pass filter which passes only the signal being played back from the magnetic tape recorder, allowing it to be recorded on the high-speed graphic level recorder. Servicing 26, Normally, the only servicing required by the time tone amplifier will be occasional tube replacement. If more extensive servicing is necessary the amplifier can be taken from the rack by removing the four screws holding it to the tray. The control knobs must be removed from the front, but it is unnecessary to remove the front panel. The time tone amplifier employs three 6J5 tubes, two 6SJ7 tubes, two 6V6 tubes, and one 6X5 tube. 27. The chronometer time control and phone monitor power supply (Fig. 44) furnishes all operating voltages to the units described in paragraph 24. It is located on the left side of the second shelf from the bottom of Rack 1, It employs a two~section filter with condenser input and supplies a 260-volt DC plate voltage and a 6.3-volt AC filament voltage, Negative bias voltage is available between terminals 16 and 17 and is controlled by the break-circuit chronometer to obtain time indexing on the original tapes” of the sound level recorders, Bias voltage is varied by means of R~202, located on the under side of the power supply. 28, The 110-volt AC input to this power supply is fused at 5 amperes on the front panel of Rack 1 by the center fuse labeled TIME TONE SUPPLY. This fuse also controls the 110-volt AC forRack 2. To remove the power supply for servicing, disconnect the cables to it (all are at the rear of the chassis) and remove the four screws located under the tray beneath the four corners of the chassis. This power supply uses a single 5U4 tube. MONTTOR AMPLIFIER AND LOUD-SPEAKER 29. The 124A monitor amplifier, used only to drive the monitoring loud- speaker, is located on the bottom shelf of Rack 1. Its input comes from the Cannon receptacle marked WOWiTOR on the rear of the Time Tone amplifier chassis.. A SPEAKER VYOLUIMe control to regulate the output level from the speaker is located on the bottom front panel of Rack 1. bs eeiver wit Me eat LS, ‘aoa Lor CES vg W EOE mt Sag SO Seely mid Be ene ysiaeter aes ee Me) wy 4000s hen eee bashed aa ay reAcste np Ain Meier es? .nohilsog » i i nhs ar esi ore Chen hsb Bora lye, Peeirve(si: ) : ; q eo hi Bion ort ¢ Selig: 7 ee Bed. vel Gye pat 2 hg - Aahoae Oo ieee aah as Beet. ae a a ‘pated Pains aft Cybele ede ong doktor NedLiY Gatzorsl” wee Oa. C3 Vth SLWOIIE (aebtoaut gat odtien Srwast ott goaden data pkey foes BEN |S oatee vate 2 ‘ld ie bole Mee sake isan hae mar at on eatinies Wa oka, Vie ehd yiacseien Gt ERfaiuoes avlenmdne: git, 7h aduetepuiqnt p pdus) Lane. 4 Bnayoa tues sil anivomes ge Hon wt? nent peed of nepte Lee Pp der oy ee” Fe aa | Covamss ad deur Seer for Gio eit: ceased ago Be i f$tbic OS Gio Sis Sil lone: énoey 22). eV od yates Z ndud @xe 16 ia seodateoyo ots! yaodos Tuco owt | a2 (AW e et) alee nenog “tibiae Stolg Has-fotdans Skt ned seapoRne! i | Fr Bs) & 13) Eo 1s acl shea hgiiv cad of Feedfey wilien4e zs a vet | eee obtt5d Md. watt tata tose ed 7 S.tetiaga Gada cies | ies {i seatt ws ciov, nemo l 72. Gaye LotE 1G: a kis sad mS Ballotsiw, alot, Vl tis Os: eleni ins : nae: ee eabs ate eit) Hh Ciceabhh. alee tekeede, ee “ia Awe et ain Ol here pew Proust: ler ee. pig hel Shei iia Sen YU hel tey al. 2B ad AST Bla, oi oe es hi ‘ nd A Ba a! $10. Roope Jes Cres HOCH os ea ; "19 FO) 1.5 { in : 7, 7 \ aes i a) 4 Cink puitcoie y= - i mie piel a. yt , vik?) Gil DYC ne i. 0) ek eee | f a) lope i Ay ; cs < ae ; Tetae’ Sit Golds. Ie I SP weed eat co en 7 ; a afd /We2erst 7. fe ur ee j 7 uc r | — "Ts 7 rn a di Wee. ty A aL VuaSs 2 PY 3 i lon 2 gee G S a anengs 1 é i « + s ™ 4 4 t pf aPC LT 4 Cid Lipa: | J. SY PEs Sah ies bong Pe eeiian sd Te - a Mea Ae aid . of Sts 7 eae Pe stote rie taste] eds is bag Gee ee i mati i SACL To SODOMY 2ts Lb ee. Aa ae | »ioodqeset tore a Gert a: til rs = 4 } de ae it * r me a #2 Sie A 8 me ae Oye = ja A joe ° aad ol sa bavesiin gree ye > > OG? Ae | H - * ‘ : A Ss + )} ’ ! tu 5 ‘ - Dil ie 7 bane) e Z _ “5: See a P30; The 110-volt AC input to the monitor amplifier is fused at the rear of the amplifier chassis (Fig, 3). In case of power failure in the amplifier, check this fusing. The chassis is bolted to the tray by four bolts at the four corners on the top of the chassis, These bolts pass through the chassis and screw into the tray. 31, Fig. 45 is the circuit schematic of the 124A amplifier, A low-— ' frequency rise equalizer compensates for the falling off of the monitor “speaker response at lew frequencies, The amplifier’s normal over-all gain is 50 db; its maximum undistorted power output is approximately 12. watts; and its output noise level should be about 35 db below one milliwatt,. 32, The 124A amplifier uses the following tubes: 2 type 637 (replaceable with Western Electric type 348A) 2 type 6L6 (replaceable with Western Electric type 350B) 1 type 5U4 (replaceable with type 5T4 or Western Electric type 274B) 33, The monitor speaker, a 15-inch Altec Lansing permanent magnet speaker housed in a bass reflex cabinet (Pig. 28), should be located to suit the con- venience of the station operator, The output of the 124A amplifier, avail- able at the rear of Rack 1 at the right-hand side of the amplifier chassis (Fig. 3), is connected to the speaker by a cable furnished with the speaker. The monitor provides an excellent and rapid means of checking for channel noise, since any change in the background noise characteristic of the channel being used will be immediately heard by the operator. AUTOMATIC SWITCHING UNIT Qperation 34, When a signal arrives the automatic switching unit (Figs. 17 and 18), located at the top of Rack 2 (Fig. 6), automatically alerts the station operator and switches on the motors and time index control relays of the two graphic level recorders. Fig. 46 is a schematic diagram of the Automatic Switching Unit. The unit employs two stages of amplification, the second of which works into a tuned circuit that is resonant at 175 cycles. This circuit controls the grid of a type 2050 thyratron tube. Normally, the DC grid voltage on the thyratron, which can be varied from -32 volts to 0 wolts by means of a control marked SiSrTiviTy on the front panel (Fig. 17), is set at such a value that about -1 to -2 volts DC are on the grid. This voltage just suffices to block the tube and keep it-from firing. 35. When a signal containing energy buildine up to 175 cycles is received “it is amplified and passes through the tuned circuit to the grid of the thyratron, As soon as the magnitude of the amplified signal exceeds the predetermined voltage, the thyratron fires and plate current flows, energizing = ee a, faeces a wae eng doled da eLotdegd ee td aM feed anka! (eee ino seinese Smet CLI ds AL *“imid. pees ke osige BEM ois ity. sath BEUPh USREE De ee SOA ht te) oT Beata tie thd bat ba t icone oT ane eg eats Chr 45 PEELS fan ; ee vain, STE Vite ES aetN : 4. chin cd ae iy ete) Sita Bl Antes VEU, GURSONE. Sem, pat iise, Be PEmelagO xi TNR SA 7a its uP ns . Tt 07 oe + ni et ' 5 Po oy Pe am * OAS’ WAL 2 a Listed) Pa ICL aa) eee ‘ re Print ; p a f _ J & . } ‘Sy 18 LS cance Seid aS baotsnosd aise ysis es foros La Yo Soro fa Cpe = A p ‘SHig’ da CEL ule page : % : i bis p, tevowal tp be pista! fae cata) SOC! ; 2 ; ; ee Sh tu ae sO, om BY . : 7 “Suse att) minty: 4 | ayes : Sie Ey ey 83 Cait, SGstr? fi’ spat: Bit Sea De iaao se seta hic bitss ig 1 elieer 4) ‘eth eed) DA ar Ho oa] Diheat ¢ Pena oie’ ea Rng aos rad? bik wht s ae “ty Loo ae nt Baotyot od Jae ee Ome Ra eee Shotts 309 Low tebtodae pM ote Odi sto Ba howore Blig oat hee aay ag i | 47, When the )O70" switch is in the AUTO position, the motor power supply is controlled ey te automatic switching unit which will switch on the motor even if the A\P switch is off. This will cause paper to be fed through the Be: even though no record will be made on it. If the AMP switch is 5» however, the jewelled pilot lamp will glow, the tubes will be heated, and Re acccnaa: will operate either manually or by the action of the automatic Switching unit. 48, A study of Fig. 38 wili show that the input to the "slow-speed't graphic level recorder is permanently bridged across the system bus and that except for the reception of broadcast time signals, it cannot be energized from any other source. The “high-speed” recorder, on the other hand, can be energized from the system bus or from either magnetic tape recorder, and _ ‘may also be used to record broadcast Jeune Signals. The selection of BUS or WiRROP; (mirrophone) and of WIRRCPHONE NO. 1 or MERROPHONE NO: 2 is con- trolled by S.-10] and S—102 on the front of the third panel from the PSE of Rack 1 (Fig. 2), the time tone amplifier chassis. Speed Controls . 49. Located to the left and slightly back of the power control switches is a gear box with two indicator knobs on its top (Fig. 23). The left knob is labeled .FITING and controls the speed with which the scriber moves aeross the tape. In the center or © position it disengages the scribers; turned to the left it gives NCoperatson and to the right FAST operation. The right knob is labeled PAPER M/SEC and also has a centes 0 or neutral position, a left position of | <3 and a right poste of 2Y LO 50. With these two knobs paper-tape delivery speeds of 1, 5, 10, and 50 mn. per second can be ohtained. The normal position for the Ns low-speed" graphic level recorder in Rack 2 is with the WRITING control on FAST and the PAPER speed control on 5o This combinabion gives a resulting paper tape speed of 5 mmper second, The high-speed graphic level recorder in Rack 3 is normally used with its WRITING control on SLOW and its PAPER speed control on 50. 10 This combination gives a resulting paper tape speed of 10 mm per second. 51. Although it is eres to use the WRITING control to start and stop the paper feed, the controls should in general be set as described above before the recorder is turned on. If the (iTING control is used for starting and stopping, the time indexing space interval should be measured to see that it remains at 5 or 10 mm per seconds if the interval changes ‘the time evaluation will be impaired. Too much force exerted on the control Imob to effect clutch engagement may introduce a slight bind in the paper tape feed and affect the spacing of the time indexes. This difficulty is not so likely to occur with the 10 mm per second speed setting as with the SIGS i ow bc pee Weis) dys 283 od. 0 etal ah Top oh: e é a a) 4 ee be a a . { on oe 4 i) : - a _ or , aa i ‘ 7 ar a a ditgene “bsaqectialem eid pbtygn i wants, SEDE-O° RTD" bs bhi RisepiAms 44 25 re ) Waders Verde nia: ands erage ead; Ort ‘poizeneds ad tones, BRnge gute’ a kh. “denpbserd ig ed 48 7 "ot gael S brad) Bodig ity, oy tabs Ds pen haractiK edi’ boss oe ; brie, .gtebioves sas 2d sigem edd next % Gud a ioe wil noth bem ig tahtae fem: ge ralangiosat 6 dente ai Dipper ot. Peet “er ge ,. -~noD bs a wh VAI: dis fochae (stongoss fay vif = toute ong ave Sense (Sebi ef os $hoAe ent op <~ fee — : a ei -ulesedto nena eocd omts ent TS ; ’ i) z ee = oy _ : ibe ae y be 1 f Se | . . * - eagcd hws Ipgdago sowo0 Meda Bg) oad Yrdue hin tas tel add oa bainnea Mel str CER 3 la) god! ath Ao Edond acdso thn udte sods Reta Tete t Oo and ylodedw aie boos aie talon Ico: ities “ivi ce bets -~odiupe aitd aonen cea th wi: nabs too. ay 83409 Bik: nt yotiivateds = fie te Sill? od (brig: ao tgemego a pevis JOthat oa oh faction qo. ates" s. nen opts btut, a be fecal > i is + ‘na ddheag Jatin steer ye to ao csleog cao i OA ue i pay Sake = a rv OF, bea sod 4 ee To. & bao: ge ¥ Eine Vita! A GOs a Se €45CD> fie f ends, Ae - ' ¥ FE 7 g* : ae @c.28', Pbooca-we le ent xot nondsece Asmyon 4g men inude 20 deo be ei She a foajees indy LH ret) 228T ae ) Deady tides 4gs0. SoLdiveot S BEYER Us aeRO SENT ny NRE [ISGhOnee Sead mckoons Ves eetiig “Shei atl” eat Ho Loqgdide Geaqds v4 eat 5 ic ‘ F Fie a Se + vr "i he 4, - * ae 7 . s ; Dele ae Wee Te Obese Bobs IGEED. SLOT f ae ; guise. Dat tugged! Lorsnes Ri sen of, eldiasog ak oh eet Ae SFo eli ae 26, ee Sh ened AE Olives ciowsno5 25] net toes Ae Gan dt, Leesan ary Shr th pase Berista tat , spa onemee ‘Bele beodpenen 3d J Liai! Vb dare. Age GHTSaciLi Gitsd w2..! 4 ted Tove bags seyret ade ; . z ta sm sl so Cogs. 2 nen Jk aes dinkice COD Oebeuiegull s ke Fs ~otebbeve Out. Satie) pbs sates og & ie is : Sy Sarees hid > Byes sake avertRooes tig yn 0) sid-ciie syste oll yiaht of bs Wi focshomesite iG, tt et Tago Bild He TO: Sf GSH asi SlaT ert oye ia Sinemet ag is) vats 5 mm speed. The shot arrival time evaluator (see paragraphs 108 through 14 below) Sere be gues to cheek the ‘time index interval fOr both es AY BYAID a pay ae 7 rs Bey bese OS ars re = hi IAPER smeed select Pow. Wire the aching a) Oper: ILS Do not Inserting Paper Tape 52. Just to the left of the clutch control system is the index relay and writing stylus carriage assembly (Fig. 23). Normally, the carriage is latched into place, the latch control lever being just to the right of the relay coil, When it becomes necessary to insert a new roll of paper, the carriage assembly must be unlatched by gently pulling the latch control lever to the left and at the same time raising the assembly which is pivoted at the left-hand side, To prevent the writing pen from dropping from its guide, with possible injury to its sapphire writing tip, it must be set at 20 on the writing scale before the carriage is lifted. Place a new roll of paper on the spindle behind the carriage, being sure that the holes along the paper edge are properly lined up over the drive sprockets located in front of the carriage assembly, When the paper is in place, gently lower the carriage assembly and make certain that it letches properly. It will be noted that along the lower side of this carriage assembly is a row of short, pointed pins which are spring loaded (Fig. 24). These pins engrave equally spaced db division lines along the leneth of the paper, so that the level of the signal with respect to background, etc., can be determined. Protective Relay 53. Mounted on the upright metal strip which shields the tubes from the paver-drive system just described is another relay. This relay operates on 115 volts AC and controls the indexing relay on the carriage assembly. Its coil is connected across the recorder motor and it is thus activated by the MOTOR switch, It was installed to prevent the indexing relay from operating when paper is not being fed through the machine, causing the indexing stylus to dig into the stationary paper and stopping the paper from feeding freely at the arrival of a shot. Make certain that the cables to this relay do not impair the paper tape feed. g the Si ug nal Input Potentiometer 54. To the left of the carriage assembly is « box with two small knurled knobs and two binding posts at one end, This is the signal input potentio- meter, across which the signal from the bus is applied, The potentiometer can be removed by unscrewing the two knurled fastening knobs and lifting up. Pins are located on the bottom of the potentiometer to facilitate re- placement, When changing the potentiometer do not screw the knurled knobs too tightly or the sliding arm will bind, ald ed te ieee aula a5 nny et ri tea bus’ adit ah moves iP mm iii: amy . Nepeat es A Aine ost Ge Tlok . foudeno coast ode iE Dk Baie vig 31 mahi Leica TE peas vankinese fd takin, fg HP eth Snub iow © } aaa) SRE MoS y eal & ete Sioa et aaptad wedi sate, uoted’ oe LP batiad? nora Be Svan “Ha oT OM heh: ycisd grog 1h GS eed. srt cart ie hee : pOTE | 294532 fopeadads weanyes Sxms ita e Lan oF. ae pe hae Sie dishes esslimes walt Ao ccoks Bohol. 1. fy DEST oF , ’ = J bob SE Z ba 6 de Sh ae at u Re Ny is Sate WPF 4 .WStSq ho iipuel aatmiole contd tx osu ,rode battalded of 9niw jn. | f re che mae Rodel ae eee rig, ai it : ry iu a! P OLIN io Wats ; i . “(8 SoC IAS OX lairace ‘S 5 | i. Aa — a arity 2 ALE EE ntus apt warotnt a't ee “ps ‘ 139 id: cyke, 2 et Tt 24 z fy n% ’ : Ni | Z 7 } - : hd ae. ~ 55. The recorcers are shipped with 0-75 db potentiometers installed, This means thai the db lines inscribed on the recording paper are 7 1/2 db apart, giviig a total of 75 db for the writing width of the paper. A 0-50 db potent: ometer is included in the spare parts for each station, This should be used only when very weak signals are being received. When the 0-50 :b potentiometer is used the lines on the recording paper represent step. of 5 db each, or a total of 50 db for the writing width of the paper. Care should be taken when handling the potentiometer to see that the contact train, located on the underside, is not damaged in any way. The slider arm contect moves across this train to Wary the potentio~ meter resistance, Hach week both contact train surface and slider arm surface should be cleaned with carbon tetrachloride to keep contact resis- tance at a minimum. ~ Switch Box and Amplifier 56. Directly in front of the signal—~input potentiometer is a grey box with two phone jacks and a switch, The left jack receptacle labeled HS MONTTOR is connected across the output of the channel in use, and is for monitoring purposes. Only crystal headphones should be used here, The other jack receptacle labeled EADIO INP? allows the output of a radio receiver to be fed to the recorder for recording radio time signals from the Bureau of Standards standard frequency station WWV on the recorder tapes when making a chronometer correction, While this is being done, the spring-loaded switch between the jacks must be held in the RADIO TIME position, This eliminates all signal except that from the radio receiver, which may then be read against the break-circuit chronometer time ticks, 57, Across the rear of the chassis behind the shield supporting the 115~ volt AC relay are the rerorder~amplifier tubes, with the exception of two which are located under the chassis. Sensitivity Adjustment 58. On the top of the chassis between the DG Milliammeter and the AC power plug is a serew-driver adjustment labeled SENSITIVITY. This controls the sensitivity of the writing pen, and normally is turned fully clockwise for maximum sensitivity. = _ Checking for Erratic Behavior ‘59. The meter, a DC Milliammeter (10-0-10), is a signal-indicating device in the writing Circuit. If the mechanical operation of the recorder is correct the meter will reed about O when a steady signal is applied. With the motor turned off and the intensity of the input signal varied, the meter “should deflect to both sides of the center position approximately equally. This indicates that the amplifier circuit of the recorder is functioning normelly. ~ 15-= mes oui) ern cartes “ks eee 205 & Piy: sbi setae ar2 £42 eee is get ks ied 0 sere tate! Cry bly ; = (Se veils ects) |i ey aim ¢ Paes Od SLse ite ae DELS Sik, Sek errs, wit nae abe Bn AF ian har be ishuid . 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Bate BO | ivaed Sabade), .sde4 aectqabexay. siz Srbaven eho Piet cates sd Dery 1S SoM : ed don diner Btibbe . ee Bo Sones Eris 689 bi Go touel wediasa SCIP IMAGia Ao mosdod wed tn wees) Bh ag Brig: enon piven Siig, Sid FWovinse Peace SS Gekzaddo cetastoo sete Baie : RESO! epic ved? peips “tak ae ith Wade nd -syedde Taafinied gwd “Ceiaoesie aio Nok ares arial big Woe: Toataria a ag woLad ulvee — a ee ee 7 : spa ar OT aa adjustment of the relay solenoid, By moving the solenoid longitudinally by the use of these screws the tension of the spring extension from the magnet bar can be adjusted to locate the timing stylus shank so thet it operates freely in the clearance hole. The ideal position of tie armature from the magnet bar is with the gap as small as possible with the sliding bar at the rest position, At the end of the stroke of the sliding bar the timing stylus shank sleeve should just clear the opening in the plate in which it operates, Too much tension either front or back will cause the mechanism to bind. 75. In the lower part of Fig. 25 are shown the two adjusting screws which hold the guide plates for the timing stylus slide bar, The adjustment here allows a crosswise movement of these plates so that both the timing stylus shank and the magnet bar spring can be Seuss centrally with the sliding bar and the eget ne scriber. ‘End View Fs Fig, 26, an end view of the relay solenoid, shows the magnet bar with its spring, and the stylus shank with the stylus projecting. It is to be noted that the magnet bar spring just barely clears the side of the main stylus bracket and is also above the slot for the writing scriber guide pin. The end of the magnet bar spring which fits the slide bar must be clear of the slot in which the guide pin of the writing scriber operates. MAGNETIC TAPE RECORDERS ‘Location, Use, and Connections "77. ‘The megnetic tape recorders aré located in the lower sections of Rack 2 (Fig. 7) and Rack 3 (Fig. 10). Their schematics are shown in Figs, 48 and ‘49, and on panel and chassis insignia they are referred to as MIRROPHONES. They consist of an amplifier and a vicalloy~tape magazine. 78. Normally, one recorder is in constant operation. The other is turned on by the station operator to maintain continuous station monitoring after » _ the operating recorder has been switched to "OL!) to preserve a shot arrival. - The magnetic tape recorder in use and switched to RHGORD is constantly re- cording and erasing; it therefore records the sigual in its entirety. Simultaneously, it records the’ 3~-Kke DoS from the chronometer time control ‘ unit . 79. The signal input lead,to each Mirrophone is from the receptacle on the - rear of the chronometer time control. and phone monitor chassis labeled a2-TO MIRROP, ist, STA.-1, It is plugged into the jack receptacle marked SIGNAL INPUT on the front panel of the proper Ruck (either Rack 2 or Rack 3, Fig. 6 or 9), and the signal is applied directly to the input of the tape = 19 ~ 4h a fh ener bs. Gs ae shat! a eo reeleG ; a oe " Nd sf awrite warldeut on eves L Beebe: we; i Be cs lasts pad vaandeut so! Bish! Teter ebale elites: ee PAGL < sislg ‘epheg pales Reece ait ti20e w Pos ebdala: Heid. 'y dnamevout ae Ses sarbete oda te ames _ ofl Be sack eee GA Be hkontelos, Caley Baa toaely ad ‘OS es gry vari ra autyde ata ‘Giby tal aN eh ae Nutten pus torebls BNd exhorts Spies 6 ut Babaae wet te +fey PREEL. Tz heey ie rere ih) ie tah ase 7 ayoes cals ey eres To “144 fo Bu deen, read Shise adr -esrt House 455 ws t i = Main Ete By STE} "Core hag gi’ Peete 1 3 tor nite he Fh a TATE Dan ty Bi 2% TOP ee Sr Dick ha enyin + t - _ , “= - AOE ERAS po te ta tc S75 a es Wars 92 58 Sill é © sur gr . i a ee Pred: any oe tare 2% A i ioe ‘ th 4 a . i ovale .e Jeno Soe “oat nies Moa amid orioatio ie ‘te ; ; iat, sit Cdn Sez p <1 fo g5eihae & Aoesl seas. eye soak Peace hg ot aio) 2d ao See e paok ; Ne +L a ery Bs aes Tats Pies es 7 a A foe sQRa ai Ee ans Bid) od) yesonts baking s Sais ti? Soe 1 ~OTsc f . : recorder amplifier, The 3-kc tone pulses are applied to the final stage of the amplifier, the 3-ke input leads being terminated on the two left- hand binding posts of the terminal strip on the rear of the tape magazine, The 3-ke signal lead comes from the Reece on the rear of the time tone amplifier chassis marked : MIRROP. 2nd. STA.-1. The two right-hand ter- minals on the strip mountedsc on the rear of the tape unit are the magnetic tape recorder output gears, These terminals are connected by cable to the receptacle marked 2..8{0)i i//RNOP.-1 on the rear of the time tone amplifier, 80. During playback, both the signal and the 3~ke indexing as recorded on the tape recorder are fed to the time tone amplifier. Here the shot-arrival signal is separated from the 3-ke signal by a low-pass filter and applied to the input of the high-speed sound level recorder when the switch on the front of the time tone amplifier TO RECORDER is ‘switched to the MIRROP. position, The 3-ke tone is filtered out, amplified, then rectified, and finally applied to the time-indexing reley on the high-speed sound level recorder, causing its pulses to reproduce on the paper tape, in its identical reletion to the ‘shot signal as recorded originally on the magnetic tape recorder, Distinction Between Mirrophone and Caltron 81. .It is desirable at this point to explain clearly the term "Mirrophone". Actually, "Mirrophone" (Fig. 48) is the Western Electric Company's trade name for their model of the magnetic tape recorder. hen construction of the SOFAR station was begun, these were the only types of magnetic tape recorders known to be available; hence, all name plates and references concerning the tape recorders were marked "Mirrophone", However, it was discovered that not enough Mirrophones were available; consequently another type of magnetic tape recorder was obtained bearing the trade name of "Caltron" (Fig. 48), 82. Basically, the "Mirrophone" and the "Galtron" are identical. The tape - magazines are alike with these two exceptions: a. The tape on the "Caltron" is a little longer than that on the MMirrophone" , b. ‘The recording head on the "Caltron" contains a pepe iene: coil in series with the record—play back coil. 83, The major difference between the Mirrophone" and the "Caltron" is in the amplifier, The ‘"Mixrophone" has a two-stage audio amplifier, and utilizes DC for erasing purposes, The "Caltron” has a three-stage amplifier and employs a 25-ke oscillator to furnish AC erase, The added stage in the "Galtron" necessitates the insertion of a 40-db fined attenuator at the input to the amplifier to prevent overloading and distorting of the signal, 84.. In both "Mirrophone" and -"Caltron" units, erasing is accomplished only during the recording process, The tape passes through the erase head just before it reaches the recording head (facing the tape unit from the rear, BO eghde ran bale) -a 4 Sto ond alias grutne od ai beak a et on baagen. aide ass eis ne iets Lora i7is & s/he enor Gite aes sean eas sc ondgaiert ot pour Weed tis tes bua 3 fale! MT eke og guts aa Co “Cages DAT IBER RI Sis ie Sas ait Bid fodecrccé u! ia ids gd Se diy Kd badbennes os. f meant Aheht chia tapas sgEbhigns: ap Baldy Rad to Tae, = ae Sealiam ee rere ‘hohe yey aE) eens sired bis Rie eal woa , doacdeeio . VET OR aie Bet ae iprarin rs Si Omari o! Ost, o745 r3ehiooeg as Dotidas Baa sence | pampenge ee time t2 bsp ey ty mol Pejensaead drow) GAG io setae, gator cy pobaoasy os maIsOs * Lk rests "(Sei Zb0q ee Tens gd potlad we SX Salle! Paget ions a; be olga y sees beeioet se yere Mente “ebb ae (oom Sore liiy 6.78 Sel.nedipes SRG TOGy 1575. Ona Peerage .< Vela OALKeLae evaod Olt. Ot Rsokdmeus add es genes) = Bias ans io Saloon ; Slick eek ene Peinen Mime Whites rae pebroaun GOMES BAS Sc otlnor eM yey Soe ™ oe « at cack cr SL aeees Sits Witsoe on HEC te gs Iatog skit 14 acdetiaed i Me ina ened 4! saBaned a HAavseOw os Sf (Th ek T) tanto i wou, at ant i¢ colsenag oD meds .rebyooss bas Meena Sid. IS: Lee mes SISO IISS PRS eee Lo esa eG end et 522.7 Sanit FSi oS daepenag: Banyo pert leat ares po? 4 SR “aE Levees on. gait LEV IGE Ba ad OVS! poet! heise | Sa eree tyaaxnn aie 7H STFS: yeeros 44 BME, CU etiele ttt ates Me 1d zs yng galt: eg) sings wh, “ * nogee aa ae aie Lie aoc bed *esao eae Nz weld esd yO socene nee en! leotinets ers ries rane aie ete ity ! cia ot RTE ais: eee : ENO EM Soca “oN. i ‘ A f , Pe Sop gq <= pe is Wah RUEE) re pee te ht ate As 2 ec Asi? #99 Ae. re Bee Miotsisg! siFat 4 7 : ' 5 ’ trop jaisogreed § sitegies Haomsiay? wie cc Gaed safbucoes eae a OD argue oe irones od ii 3efipe ’ Wa: i ee E o a - Deer TuiLlrelen os. _ the erase head is on the left), Thus the wire is magnetically clean before any signal is recorded on it, During playback, the erase circuit is inoperative, 85. For simplicity, the magnetic tape recorder will hereafter be referred _ to.as "Mirrophone.” Where any great difference exists between operation - of the “Mirrophone" and the "Caltron't, direct reference will be made to the individual unit, In any case, each installation will contain either two "Caltrons," or two "Mirrophones," Operation 86. ‘th the front of the Mirrophone are its operating controls. Two volume _controls are available, one for the signal labeled SiG. V.C. (normally set ; at about °7!) and one for the 3-ke labeled 3 Kc. Vf. {normally set at maximum), On the Galtron the power control switch is on the signal volume control; on the Mirrophone it is on the 3-ke signal control, This switch turns on the power to both the magnetic recorder amplifier and tape unit _ motor, 87. The large indicator knob on the front panel labeled TIME is connected to a 2.5 ropom. Clock by a slipping sleeve engagement which permits it to be moved by hand without damage to the clock itself. hen recording is started on the Mirrophone, this indicator is set at zero, and is then used as an indication of recording time available. The indicator makes one revolution in two minutes and thirty seconds. Maximum recording time avail~ able on the magnetic tape recorder is two minutes and twenty~two seconds. After this time, the first part of the signal recorded will be erased, Since switching will consume some time, it is necessary to consider two minutes and fifteen seconds as maximum recording time, determined as approximately 3/h of a complete revolution from any starting position of the time indicator knob. = ot | eis. ae tenet p yee Eiemeaisi ata) or ato eaQ - PS. Sab e210. anu a = RVUs We ee a OR 7 : ; ‘ : } ‘ , i BoEbeR its was ise dennasn) ex, Eyam UMnoaFs send) ct I SisaHi Ky MaRS ct “ens Haw meets Ota ty kodotal ai. , Vad’ oF yd See hous odd jiniey grio ead eye tre ott ed asigl eet ons ara Setdisene qotontsd pioeeeeG Bb) Id exitinevass ort 1 acme chlo Gree ores ens oe Weta pys—Lle pt: yaQotdh bos ad Sate se +S}, Gris LAP Rect wha theaedcad ne ae Hoanoge es ) eVonad ab Rte saree : SWS to aLeb et Binet os eff fotrin Ia ,Gil ‘Feanaee 968 sort Loos dbasagit Bon the Bieri .Ek. ete mt: 13 Sino Sooiham og Feyon, withhes Sde ge .xeeoror 5 TGS 3 Sono Ble Sel ee cies loess hs). § obese soieutftost bcs soldpssag. tou OPE eemomr Tarai 42 Ao Siln eae + . . haat : ra he toe Se ja_3° ay34 j ely eye) aon vost Jae edn Os 2D Ss lerouenda J iiotis. Bi Ac pe old amid) heriac eames 8S Bony em? 10 io acd? eases | i. sree Gees nf deh 2d Jeans ats Woes goss S00 fiubsor ofensdad oF + + KShoL Beit saa rel avila Gist eat kyint bcis Toles eon cat gilt Bepeee = v : . paieompSs) So¢ iicets ‘sf = ’ > 4 lalliogs det ‘edd SO stmorto orig OAs mi we.eo 4)'d ct? obs eee Rad. ms Lisa ar bad BF 5 Aa geen ins oo aS yin Bathe .s ‘7 2 atti + BD Ca SS 3 : ~S tage ak tHhwoom GQas sso Sof Bll) | SevemoR Sfarmetd OnOF ORAL > iced corkt acd! to Satoo Pape ertnart) Sus get Dwlotolnt solo. Slots Wu soe ndiaaen. isin eet enue Mid, LAND LS SOME “2 26d 19 30me = Wreoegoose se ideue Pan Ve tammoi ive Tis Fo sdag oct cite eieqeenme M. Siok Tied yishhecse B Nes auceds gifione: Lair Sula esa). Sil ee bo a: ai) adeleeacd aq e259 Gee, meh ice Lies Os! rahe 7. Ov reer ee Var hevrana ees ‘5 TF WS Bee 7 Le 7 Serie Sal th Poe RIAA bo) Lh ome PENS QEl GD ‘ Hevea: loss ees pany. ’ a Kits fs te oee i sea’ 5 vor 4 i] J iuot.loegag i eaeee cveaeet 105, At the right rear of the chronometer shelf a terminal strip for the time control cable is mounted. Another terminal strip is mounted on the inside bottom of the chronometer box; the chronometer circuit terminates on this strip, 106, The Chronometer supplied as station equipment is a standard Navy type Hamilton 12-hour Marine chronometer, designed to run a maximum i 56 hours on a full winding. It should be placed into operating service nly by Qualified personnel, Navy procedure for handling, winding, ae setting a chronometer should be carefully adhered to, A description of this procedure . lies outside the scope of this Maintenance Manual, ° 107. The following three rules must be strictly followed by station personnel: 1; Never let the chronometer run down; always wind it at regular intervals, preferably. once each day. 2, Never (eich or interfere with the second hand, Never move the hour and minute hands counterclockwise, 3. Never remove the chronometer from its case except for winding. Further details concerning this type of marine Chronometer can be obtained from the booklet entitled "Care and Handling of the Hamilton Marine Chronom eter," published by the Hamilton Watch Company at Lancaster, Pennsylvania, U.S.A, This booklet is available from the manufacturer on request. 108. The accuracy with which the source of an explosion signal in a given area of triangulation can be determined depends upon the SOFAR station operator's ability to time the arrival of the peak of each shot, The shot arrival time evaluator (Fig. 27) is designed to enable the operator to do ' this timing accurately to one tenth of a second, 109. The shot arrival time evaluator resembles a slide rule, It has a body of wood with gates on each end to clamp the paper tape from the graphic -, level recorder tightly in place, The sliding indicator is of lucite. It has two scales engraved upon it -~ one for use with 5 mm./sec, tape speed, and the other for use with 10 mm./sec. tape speed. Two small metal posts are located at one end of the body. ‘These are designed to fit into the sprocket holes on each edge of the waxed—paper tape, and thus eliminate error due to improper positioning of the tape in the evaluator. 110, One of the engraved scales on the cursor is labeled PAPER SPEED 5 WM] SEC, This scale is used when. ehalyzing tapes from the "slow~speed" graphic level = 2B Paha eh preci inde al See = en rete ay enim TEGO De aun. i the i tS bee head La tecemoge;ifo Lis 74) ewe oh ; a yor Er ae atte oils 9a, beds ag acnoarehnas F ab) aE. pet ge nigt Heiser one, Sreaeky B pelt sis ‘ etdert = ig, a hart! od Boru igs Pan hana Taw Ee ie % re cet Sowite Rot iassCS Pepagheeaid. 24 felis 3 & gut: de B3u | eHLEbrte Ricreassrs ate et STL KS RAAL, Cu, - ee eUnhs 25g Bing Mai adtrqiresbo ih, es beveihe witcisizo binotd aa 2 tapnan Shneigdatex Grid? on 2good mts AG eLonseetoy cotdeds Yd awe tiot eidsside at dein asiivn south wiioss de ge belie etaniea simot Aly aotemanowls oft ysl . | | nye Ga6o' gogo aids isa wi? pve revel < heat Bgodee ett dite Mebane tis Gee Binnie: Sia fone Yori oe Sathntwe Wo ktiesrs Slso ial mer, weitlaotr. i 30 banfedds <¢d neeedssemohoits eatucm 76 sau t aid tint sonse toca MIAN Side pHageeot eae Ne autlonga hie gzale ’ tan) delehodae a ; ye eOLheyLvecie Te We soeuneD Is! =racka) made no: f Lida Jeofine. oo. 1eTsostinem Sages Slieiless 84 fo ood ea 7 BOTA SATS pI SACL ES 1. AOVZe Se niieie notkolene neltoleiitoe Slime ls La ys Bolsa le sSAtOo certs ose oisgsie menigtietst = us). LOU as Sond ot HHS ses bo Been sit fo. fev ee pts at ob ¢3 is Paden Foe) d afcse ae Gis COL e te a esere o> A he “ff Sul = SEzin | F Baus oy pis Shale a socaocen Mil se lay i Lorry Letnasec ete Mek Saks teusq sili ausid es Dre sate uy rsa Toeeesece th eli tosnsions Sols a : ~ qia7 x : ; Pet td tay LAB x! it ; $ i a i Deo eo Sl Gd lied Tt i 2 ’ 5, be = 1s sé ; , tv 2 ed D8. earl Ase Apoisa 3 = ae a8 fl net aad ~ ree Pe. 7 nee a boledit eh uonitan @h7 Sure. = a: oi S55 ON fa p : bev A203 o3 3 fine = *. ar 1? 7 f . Ges £ ie ior 2) Fire ex | baoyeth on: (Ska hi ) i 4. : ‘ Pdi aint tal > a iStoe ia) #99 Seg ‘ 3} ’ 73425 00 VoDL Ee eeaogesas The station operator should normally perform the following maintenance 1. Keep the SOFAR station log completely posted at all times. 2, Rotate the input channel and components in an established duty cycle. 3. Replace fuses when necessary. This requires a knowledge of fuse size and location. All fuses with the exception of that for the 124A Monitor Amplifier are accessible from the front panel of Rack 1. The fuse for the 124A amplifier is located at the rear of the amplifier chassis, adjacent to the AC input receptacle. Note that the original fuse (a Buss Fusestat) has been replaced with the "Little-Fuse" type. he Remove the accumulation of wax and paper residue daily from the graphic level recorder paper tape feed drive. 5. Although it may be desirable to delegate the care of the break— circuit chronometer to one responsible individual, each operator should note the condition of the wind of this instrument during his watch, 6, Measurement of self—noise generated in each channel can be readily made once measuring equipment is set up for this purpose. This may be established as a daily duty performed by the station operator. ; 117. As the station operator becomes familiar with the theory and operation of long distance sound ranging equipment, additional duties in the maintenance of the station may be expected of him, These, however, should not be of such a nature as to conflict with the prime necessity of determining the time of a shot signal arrival with maximum accuracy. PREVENTIVE MAINTENANCE ; : 118. Preventive maintenance, involving performance checks on the various components of a SOFAR station unit at specified intervals, will not eliminate the possibility of electronic and mechanical breakdown, but will tend to Minimize such occurrences. 119. The following suggested sehedule of preventive maintenance and the intervals at which each test should be made are subject to revision as dictated by actual operating experience with SOFAR station equipments: a BY) 9 is, Wl nA : a af ri ; i 4%, Ps rt . : Supe Ie Seo Sy vhs ee end ares oq eden uatces Ph Srpe, eT Maccd” ii hud - pomad tie galbalang visdedguoe gol ardede 050° 33? qed ane Fatielidstas Dee sdownocne2) hos Geared fhq:* it etesom ‘ottniaea inte 8 ae a of = é eadees qicuiationer we goanda nunoqger enz ata aude of Brobiedet: Lael Ohi ens, vic oe! ba = Va) ehonteelg “gWaoose No selmbhos eged Atsaqwn cos Wyitttige Bdos : Saobtotnt etd dere od missmcnornd Jinetty vow 3 . =) 2 Wtlodawe) doson MasetoIe hh Laine Biot ae yu le eh ac E71 ‘ : : ; : 5 - 4 es DORBae Heeteod totinad Siodjbaad ‘to dos: a. 2.” PeeAshopean heveyon eater hic (yi iqexgs #e4) SERIE CIS 5.0 -O)enedoq qahtade: Eeyal ofagks 3 6 Se | — Se tbe Acataeust) Sh kereriiua 37 : eriqansons ) Bipods ede ok Toess G75) - r ' ; PaO 4ebyoset sqad “isengsn cf viens its “xo . * ROSMMONGS JArGuNesdss HOT EMO LIES Ei wii Srubssois sat pollo? bitans agzoc oe are Be Set es) = ia at ad fire fi: i sisse Jevslosns astievlim cnotteseco Loniuns Se for self-noise: ll-13 Fig. 30 e aegsurement® 7-10 8 39 ies 29,26, 37 Coding Switch; (Numbers refer to paragraphs) 104 Daily Tests: 119 Fuses: location: 20,116 for Time Tone Amplifier: AC for Rack 2: 28 for Monitor Amplifier: 30 28 Graphic Level Recorders: 42-66 location: 42 . : schematic: Fig. 47 slow~ and high-speed: 44 operation: 46-18 turning on and off: 45-47 speed controls: 49-51 inserting paper: 52 protective relay: 53 potentiometer: 54-55 sensitivity PL recorder: 58 switchbox and amplifier: 56-57 checking: 59-61 maintenance: 62-63 basic operation: 64-66 time indexing mechanism: 67-76 Headphone Monitor Amplifier: 25 Hydrophone Connections: 5-6 terminal strip: 5 Initial Alignment: 2-3 Lever~action Switches: 6 Logging Tests: 120 Loudspeaker: 33 Magnetic Tape Recorders: location: 77 schematic - Mirrophone:; Caltron: Fig. 49. operation; 78-80, 86-93 distinction between aaa and Caltron: 81-85 ; recording time available: 87 tuning eye: 89 VIVM connection: 90 frequency test: 92-93 replacing pole pieces: tape repairs 9k servicing: 96-99 77-99 Fig. 483 91,93 . 7 rae aie ‘Satbe') OLS sesso? eittan Mikey PO meh : i bereor fib tol Lean SRO Sis ht 701. BY eS sleet a0°F 5a C4 WAI EGY ok - mipued dayal sigan! » “eR, ao lisocl WA ea aideneitss pth seas bith brie re: A a Bled) comet te tens Fut to nl Ae icin in :sigehsrvs te ote or What Car ie a) * ie Romane £ ; elrus & r -_. i go ~ = « te ay + > Ray bulne MOL sogiws abot png tes Piell - ssefouetive tome it sugges: Of 0% sedhogEess ce mne P| Sie) Lamon eene & sodalg bie AL 9 pnd Jn PS eek saenocgew Gs eat sey e f : eae = = g ts ape eae La Ae hae i wil Pa - Ve sto Os ; ah BE ee "£& s fot soe! a ei oub be peep ce Fa 7 - _ ig f SOAR e Lee Vit sedase iS OL 6 ena * « 7 OGL uence 8 FF pee | “a y CL ae a Le YU Scope: 1 Selenium Rectifier: 22,23 Self—noise Measurements: . terminating resistor for: 6 in 121A Amplifier: 7,8 in 120B amplifier: 9,10 Shot Arrival Time Evaluator: 1LO8-1l1) purpose: 108 description: 109 cursor: 110 inserting tape: 112 reading: 113-11, Signal Generator: method of connecting: 6 - Time Indexing Mechanism: 67-76 Time-Tick Pulse Amplifier: 25 Time Tone Amplifier: 2-28 deseription: 24-25 schematic: Fig. 43 servicing: 26-28 tube complement: . 26 power supply: 27 fuses for power supply: 28 + USL Report No, 55: 1,2,115 ~ 9 aie nae . Weekly Tests: 119 ie gnment: 2-3 ' 618B W.E, Input Transformer (T-101): 11 tenance: 118-120 oe Be) OLY. Serres | at iBoe. saataut ac ook jonny dor? ; — ‘go PRET: psa0giid | | . gor ‘took dqinsash ; c-" AZ (9 mad poms 7 Sit eas ghedrannt aera Are-oth) densceen : = aeons Sn00 Lene.se i, sprciuesiain® gb bowser oto BAS ath EROEA gasxgent snl FS - seltelena anit woSReem ee ree EER IGA eno ena? satees vlaisel pieara ys 4 Baa BeTS 1 (201 -R) aoartoten vay Pt ES wae A aeray RJ Riatee | Eat ae SQ E eee se Heene & san iueeeoe Aer pace SAQher Buy R, “ ptadtia aod a. = : =i oa a >< va} Ey=) z i x 1 no a oy f=} ie o oO rt c 1 o = 2-TO MIRROP. 1st STA.—1 @ Ei . MONITOR N-4910 FIG. 5 — Rack One, Shelves Three and Four USL Report No. 61 FIG. 6 — Rack Two, Front View N-4855 USL Report No. 61 N-4860 FIG. 7 - Rack Two, Rear View USL Report No. 61 = se ihe nee i] a Caw Ave By ali By I) =a a) f 5%, ) ; a a i 7 ie te ' -— | 7 i 4 : . OM * = | ae: a we ’ 7 ma a ~ ‘ t | i i ‘ i f ' - = i a a i T9 “ON qz40dey ISN LS8P-N Jeplooey [eAey punog poedg—moTs pue yTUN SuTyoytmS oT yewoyny fom], yoey - g “OI = = _ Lh A dels | | | | >a Lay ® ‘ ij ‘= ct Ss B - i a . f x : : | N-4856 Ce a FIG. 9 — Rack Three, Front View USL Report No. 61 ay i N4861 FIG. 10 -.Rack Three, Rear View USL Report No. 61 ous peeds-TH pue reqewouosyD footy, Yoed - TT “Old RS8I-N rere nner rssssss Sete Ts : : 19 °ON qa0dey TSN ZOPEN Jet [dwy suo] owt, ‘met\ seey - 2T *DId IH~SAY138 X3QNI-07 2 We TOL aro SW Cop £Or Z Lo A cnet hot he * : 4 i. K i ', i < | : Dal : nt - vi a : Pe gi he T9 °ON q4a0dey Tsn PZPTN JeFjstTdwy suo] ewt, ‘met, doy - €T °OId se ca te a o ‘ ‘ ip x “8 omy », i i : ~% - ’ ; ‘ : , ‘ rf : : D i : “x ie ‘ . ' 7 ‘ : 7 1? * i = & ‘ ‘ ‘ 5 : : Fi : t : + ‘ a - OS Ww 4, T9 °ON qa0dey Isp JOT. JT Tdwy euo], ewt]L ‘met, wo ' 3908 - TT “OLA SCVITN bovr o boacy bore emcee cee burp baby ble LOL. €oLl Lovy. ECOL. LOLA | site, b ane €Op2 oehl | Fore 90). : 20 voeabe . ache se payer govh ewe < ebb av ELLY, bELee PEL 2aly pore BHO +e, EOLS Jobs T9 °ON quodey Tsn O21 Ajddng stemod Jetyt{[dwy euol ewrl - St “DIg NNOD ABOlwEOaYT O IOZA lex \oz3 T9 °ON qodey ‘Isn Ajddng semod JeTyt{dwy uo] owyy, ‘MeTA WozW0G - OT “DIA FORT 960V-N lozy, 208% 08 7 Be ‘A / Fog) Od L = 7s _—— > ~ a = ad Pe : r 7 7 : - 7 : . . | => - _ — . at » id “oe > , : a : : . bd ee . -_-2-*+ - : ) a a - = 2 a = ) 2 . > . T9 ‘ON quodey ‘TIsn qFun SuTyoytms oTyewoyny - LT “Old TO9S 209-S FOOL 6807-N "hd Bates ALIAILISNSS oO 0 E194: FO9e ie ates a Tun SutTyoytmg oTyewoyny ‘meTA Jeey - BT “OI T9 °ON qaodey TSN 8061'N ‘S tj 109-47 7 , i ‘ . i ' ‘ i : ‘ 4FUN SuTyoyTMS oTyewoyny ‘meTA wo4yI0g — 6T “DIg T9 “ON qodexy ‘Isn | 6067-N ONS 108 a) 10955 nae SOE iE AES 109-1 OL s L -- cmalacd 9-VII9-D 8-V 019-9 GO09-A ee NE eee Fee ey “ , : tovirNn T9 “ON 920084 'TIsN Atddng temog 90g °4 L - O02 “DIT LOxy TOTL twraZ L+1T < T9 ‘ON qa0dey Isp Ajddng semod OG °A L SMeTA WozQ0G - Te “Old YFOLD LOFEN i} 9) 29) TOTY, Tor 7 Ob L pat W UStVN T9 “ON yoded ISN §=gay3AINad SV Y30NOOSY 13A371 DIHdVYS ee Old S3ivi1d 39NVS 7 f { t , i f ii : i 1 oe T9 °ON qaodey Isn eoeTd ut snTé4g SUTWTL YFTM cJepsooeYy ESEN-N €% °Old ¥YOLINOW sng indNi olavy SHI L olovy ANWHS SNTALS div 1d ONIWIL dOls WSINVHOSW SNIALS ONIWIL 4O M3lA LNOYS vy LStVN T9 °ON qaodey ‘ISN be “Old SNid ONINYVN Caso 30 V. COIL CY. CONTACTS vo." a IAN OO) Jivid ONIGIOH Gand: > ‘2 aaa IVLNOZIYOH YNVHS SNTALS ONIWIL yvg@ LINOVW INagWisnray ONIYdS / a) HORIZONTAL ADJUSTMENT SCREWS TERMINAL SCREWS ADJUSTING SCREWS TIMING Si veus SHANK SPRING _—~EXTENSION TIMING STYLUS SLIDE BAR FIG. 25 BOTTOM VIEW OF TIMING STYLUS MECHANISM N-4356 A USL Report No. 61 MAIN STYLUS BRACKET MAGNET BAR | \ ar B CLEARANCE hr 1 v ae SHANK FIG. 26 END VIEW OF TIMING STYLUS MECHANISM USL Report No. 61 N-4355 A T9 °ON j40dey ‘Isn URES LR EEE SBE esa i €86TN wag pee sfilvavddv GNNOS XHDA MBN © rire SnLvHvddd GNNOS Pe o - ——_- WHOA N ass e's eee rececce ts ee. a ar iti oy ANWaWOD Sn Lvavdd¥ ‘annos Saar ii hil i ty FIG. 28 MONITOR SPEAKER IN CABINET 1-4451-A ies USL Report No. 61 SOP RM 1 VR Air (7 Heer ener tes g ae ee : SS men a — — we rE Tr i a ae i. aa seeee = sae aeeeeee Bane Ed ==m== Sceesas Ssosoo ae E a scceaeee: go sue pee Seo as Godan eases seneeacane ao ia cE a : H Bee Ho : 7 FREQUENCY IN CYCLES PER SECOND TT z : TI LI ta oi ae fas! Yt a = FIG. 29. zl aS "l : NBebere: Spee pies elite aaa it ist ce S={[E= Ed Beiere Te se ae oe E-1631 (11- ue @q NI SSNOdS3uY “BANKMOTE’ NWO.F 182 K RECO. N.Y. TAS E MARK $1463 GQNOOAS Yad SATDAD NI ADNANOAYSA 9 ¢ 4 = Sy esses Fassonsr seeeces ae IME EEE une sigan NEES! S5as8 SHSESESEE: pets SSasceenss ‘esate eros EEER iC Ee iiereeea Hu Hees seeeee = Hunn ears : SEH Sear eR = {= Zs noms ; Pat Samm Sera ieerecze: iene iBEb eases ssass : = Eee Sears a5 Goes eaz Sessseees ie tecresviseegesces feet HE i tt ea a Bann + : So oe eee +--+ fatuer a peice = He ints aa TEE Mee: TA SeeEee ae a a Ieee a | [one iat a ore Set COCO ToT eH —o og sea! aS HHH soe Ce ae E-1631 (11-38) aq NI ASNOdS3u EO., Ney. 41463 TNAOE MARK “BANKNOTE™ No.FIS2 KEL GNOOD3S Yad SAIDAD NI tH Hin aay =a : so55: = = = = Ht 7 aed Eeoeseaes cease a ern iu ae AONANORYS Ped (11-38) “E1631 SSNOdS83d ga Ni PN OLF 182 K OC0., Ny “BANKNOTE mat rr bE Ma 41468 sorlp | dave aval “AN “OO S¥™ ZBL S*ON ..JLONYNYD,, IN DB RESPONSE. Peis (BERL) a Hiies! ae ne Ha a ae Eeeea hit 4 EH a saa Hh ie aoe Pe RGHOROS RoeoR pe aea 1-8 | HET aj : a S eee Geezer Saco ceca leeeeses satecsee ieevabeeeas : Bugg case ee : abe eee eee eee sieeeet ded cocseea teeeecesea eeeess at eierceadt ae STi ESeee teens ceeee sense Boe : Teg _ aoe ee a = Se sucseus deseusasnadaseaeaae a He ad ine! a < te EH ae jae SSE ad Ni ASNOdS3Y Felt 100 FREQUENCY IN CYCLES PER SECOND ONODAS oa Ea ae de Se | seas. fea Gleges crest sep oo EE SESEESE=¢ gestae eH FREES fae Ee Tes sees s EES Hii ie Bee ae a i a SESSStEe nn: Seee=e HE Sau Yad SAIDAD Ni ADNANOSYS seeds Saeee —— Sa = ait iscueeoeel. lili feciefogegESE SL eee Hitt aGsSeEE EE ppt HE EEE | = E£-1631 (1)-38) SNOdSs3adg @q Ni a BEIGO.,, “BANKNOTE" No.F 182K © HAS 414968 Ke ( By aed, mas pe A ie i BEE se Hive ianTiit HoH | ar aaa H i HH aia ane Hate iia oe aE ni Ae cneeeeecseae oe He EH ae a aauee ae Seana SSueaSeaecs oo BGegr a Sones sezes socesssnesoseeesssee inet oo tet a io — ie a ae ee gaat ‘we om (24 =e eal >| : ees es La H ome | = fake ER Sect PLE Lae nee me qt i} el auses: omen as tf Eze ESzescsssee Senscensces sence es EH an tie +} HH i : . ae ri alia bird Uae, i i PtH iB! | | be La - i ¢ ry iw i it ite tt ct Seat ae af ae Cee nats ag GG CPE ENGL ee Re ee Se Soe ee i tee tee 1 ieee NI SSNOdSa3qa “BANKNOTE” NO-F 162 KS E0C.. ty. [HALE MARR 41466 FREQUENCY IN CYCLES PER SECOND QNOODAS Yad SATDAD NI ion =Ei eens ia ett titan He t t at a F cae a | LTE t L i3 4 { ++ cane perry +4 itil fauna gaane ESsaa ee dee ES a an = Bat aogad et ae a int Tait a precee oe Hu | Se aaa i aE paves ze AONANOAYS Le a fan HE c (GHG Aa ESSE Talalas ? Prey T ] joo} 4 5; *aew ber { ae ees a: : rE i} i f fe (aes ae | if nl pets sas SEE i } Ty == F + | 1 SeGies nil S5=5 qt SESE) wy lea! S a da ni SsNodsauy E-1631 (11-38) N “BANKNCOTE" No.F 162 KAE OO TRADE MARM ae 41468 GNooas Yad SATIDAD NI ADNaANOAYA I ooor Cin caeee, 9 cm if 1D i i 4 att in tr nae ; aus t 18 Hist euiT fones Gea ares Aw i Fl it 1 Lt } b s Ei prep tan FEE | os a area aes tt iE -Li fb: i (41-38) E-1631 €@dq NI ASNOdS3Y > No-F 162 K6& “BANKNOTE' TRACK MARK 41468 q 4 Mag ifire Playback’ - 200 a a Line /nput BE and Switching Fane! | 77am FreampLitier | Tir SRE 5 00 o Sy ege) | _——— S| = ee | | Bee orp Pstace eu Tee) 1, °% feeording OsciLlograph a leat? OH corel = \ ots mee ah a : s 5 d eee eS eee | | recta PIU) eR aS S <3 1 Auxiliarey (2). 2 8 5 RES Ee oe TTS hoa! A x 58 as Arbiter P aN & eS @ Channel | Amplifier eR P pL eeeagem| a jac ee ee Plea ee 1 Loe! Speaker Ompoli ter’ Ea ZB v > st ue é WE Jur E. Pee | | Fixed ° RIA\HBA\ | A melons | a anhfh | Qtenalor oe Balanced + Unbalanced yi 1 (Kore ai 1 Amplitier- Line (Qrailable oe mpLitlers Presio Disc Kecorder . : af Pakhing @ —Attenvalion 5 Jranstormer~ ignal HP 105 AG Nelwork =< _| Generalor| Signal BRUSH 7 Art. : QHenalor | Generalo~ be PL RECORDER Plagne e | SAC ; jo Aétoroing Fecor-de)- weirs — , 5 : Keconoer’ | LO Cm Oseiklograph 5 |4n | C BLOCK DIA GFA M WHO! | 3 ee | Time Ticks Amplifier _Y | FR lek Time Tonks | [Bye ea Eleuthera Sofar Free | ETIC | pay eg eG ee ye wf 7?lons roxing EQuifMENT lise] Kee Os 2 Aifenvation. DOL rain 2 ix fl CEE TI eae ransrormer a : ZAC ——> 7o Kécoroing os | | As of chne 1 194s Ea as OscilLograok Se ae ee eee ; ptenie a rhc | Peete cc : Fath ‘ : — : EV 2 i tompeninadeaaiag oy Bae Li) Seas, is 6 ee es Se 4 UWE “WRC. x, ae Des ll eee et: ~~ 7 ' ‘ H P toy cc fe | | bases { 4 . = : ‘is Oe ee ; ; ; | | ae tr . a t ; : : | 7 i } i ; ae ; H iH _ | a - . : ; en 7 a - : : 7 ' “= zz . : fa » Ws an = - a - — ~~ _° ‘1 = be a Oo : Hoe t a . — ) f - eo” a : ua - ‘aoa i —— -_ = é ’ — : - - 7 / i f —<+ aoe. ; : D | . i as al =f = J Ie DarkEn Ie DIGS | Pre ~AmezL. FLTER aes Om eles ler ay 1 oe Pre Dvak Chann EL Operator: Ta TylirrephonE I Oe & a5 Hy of Lo SpreD Pewer Level Kecors ve /” slags 4:3 77/72 onirrophoneE 62" sage ob. 5 7/9 mnirropoRon & 6 2” Sage Tome Jone = Ammpl. & Keer | Filrer OO Tae ae ee _ ee ee B 35 KC) ale — SS SS Salipsee ries: en ee Uh (x EX ee MonilorR SPEAK EVP Filter) Aol fourer Lerekhy | AO ROE [Pecorde ~ PASC eee - SuriIching. : Cag Ae hou! SprED | $b ESE] < Starting = cas Fetorn£ Re Stylus EP Morors fe ae SH) (gor Feurer’ heres © Cuerngt Sarl; Fecorok Pr O dee DIAGKAM YGSVU5L SOFAR Time Tek | MONITORING EQUIPMENT Ss be Le aA rere tte at mame - - en ee ns Se 4 oa + ae - - = . : . . : | 2s = —— / u ‘BLOCK DIAGRAM OF ATLANTIS GEAR FOR RECORDING AGOUSTIC ENERGY TO FATHOMETER = DR IDS Ar ee os ; SWITCH ATTENUATOR TO HYDRO. eT BR BREAK 7A CIRCUIT CHRONOMETER THYRATRON CIRCUIT ce POWER SUPPLY FOR. JP oe | V4 ALL GROUNDS TO "B" 3-45 BATTERIES He SCOPE EXCEPT Teg ek? Nog ae FIG: 3 VEE RIETET. ‘ CHANNEL*2 E- 22312-AA = AF 2 a 38 ee FILTER ; r < Ti? - 500v) LP, te ae FILTER, AMpl. 2.5 MIRROPHONE TO 2ND. STAGE TIME TONE AMPL. & RECT, ~ NON. AMPL. & PHONE EQUAL, 3 600.0. 2.5 1o 3.5KC | i rai. iy Ss a oe ETC, A — i TO MIRROP. 10 2 “Angee bn ONE fi — -—E-22314-AA PL. SOUND LEVEL RECORDER Ld L-\row Speen Fins a 8 STYLUS kd fue RELAY RADIO TIME E-223\4- AA PL. SOUND LEVEL HIGH SPEED. “STYLUS RELAY i TIME TICK — AMPL. De. ] RECORDER Es ce: i, y CHASSIS. DW *E- ee DEE TO Hi OR LO SPEED : | aq SPEAKER PL. RECORDER, AUTOMATIC SWITCHING xis FOR STARTING DL RECORDER MOTORS E-22349-AA CUEING SW, U. S. NAVY UNDERWATER SOUND LABORATORY FORT TRUMBULL, NEW LONDON, a Ach CHRONO - | METER - DRAWN ay_DH na! cinsrectaD ny 75” ons < WEE onre ht x" TIME TICK e we, rouNo ZZ 7 AMPL. u5 & i FUNCTION. ou IAGRAM nc. © UW. SOUND RECORDING SYS. SOFAR EQUIPMENT, - CONTRACT HUMes Ws bape shoe c-itl L-103 . }— ——_——-__¥ 000 WE ai, R-H10 USE REPORT NO. ol a .¥-) GF kos Lr ieee R-il\ | | O : TK +7 TO FILAMENTS T-102 WE I9S7A RED A0 if -8 - nO. DESCRIPTION AUTHORITY |aprno JOATE _—_- al a a has — ALTERATIONS — | U. S. NAVY UNDERWATER SOUND LABORATORY ; i FORT TRUMBULL, NEW LONDON, CONN. yo pawG. KO Z SHEET. OF SHEETS eer ; = = —— 19” prawn ov HS. cared 3 45novectes elon aredit fe TRACED SF oarTe APPROVED evel Date_-~ scaceNONE. eaeroDucriON OF FINAL PLANS MADE——— ‘Goare's PLAN KXAMINEO & FOUNO SATIS ae ~ - ( J dd <3 ; = i3 pif Afiak Fb - = ae SP ie [Jt teh, TA eF FS BU, SHIPS PROJECT OFFICE . Fowmawomne orrices __USN-USL UNIT © SCHEMATIC DIAC W.E.(208 AMPLIFIER MODIFIED A UNIT C : SOFAR Et BUREAU OF SHIPS PLAN NUMBER “~~ £-22312-AA FOR DUAL NEL ERATION TO PL HIOR SPEED RECORDER R-1S DESCRIPTION Ks ALTERATIONS GOK I5 K U. S. NAVY UNDERWATER SOUND LABORATORY oY P. FILTER \. 5 KC A . LR FILTER 500 . . FORT TRUMBULL, NEW LONDON, CONN. Eee oa ok Tr0s Le | Si ecomannsanee i | 4 TO HEATERS &3V DC i —______—_—--9 \2 MiBeWeCNO > er SHEET_or__SHEETS prawn sy) CREE «7 | eee 5S vedi vs TRACED ay. _DAT€_____APPROVED BY. ATE. S. | SCALE______ REPRODUCTION OF FINAL PLANS MADE_— PLAR ae oss @ FOUND SATIS: 7 ( il kh / te ee U. SHIPS’ PROJECT OFFICER o ~~ USN-USL UNIT NO.5 SCHEMATIC DIAGRAM W.E.\2LA AMPLIFIER MODIFIED A'UNIT OF SOFAR EQUIPMENT CONTRACT NUMBER GontRaAcr DATE: _ TO TERM, | & #3 OF [21A INPUT BUREAU OF SHIPS ‘PLAN NUMBER ae USL RePorT NO. 61 ecu. eee = ne oon wo £5, woe - ee ihe Pat eS ~ | Saas V- 401 Wee 1S 2; af OF 7 We ppc od: 5 h®) ice iO: Wi | SIE Te SV AC | be ara eee ISSUE pr = |) el peas No. DESCRIPTION AUTHORITY [APP'D | [DATE f 4 ALTERATIONS E U. S. NAVY UNDERWATER SOUND LABORATORY FORT TRUMBULL. NEW LONDON. CONN. DRWG. NO — —+ SHEET OF —_SHRETS ne a, prawn BYES. patetZ-YSINsPECTED py tute spared TRACED BY. DATE APPROVED aBy42 Mipates P Sy ps to 4 scaLteE NONE REPRODUCTION OF FINAL PLANS MADE — — — — PA a cw PLAN EXAMINED & FOUND SATISFACTORY ie | 1 i ~ “it 7 ; Re } ‘ a AU. SHIPS PROJECT OFFICER a PROMI ARISING OFFICER ae Arena Cee. USNSUSL UNIT NO.5278 ie : POS me ee 2 SOR rae C DIAGRAM 9 o hae BA POWER SUPPLY MODIFIED y AOUNPE OF SOFAR EQUIPMENT CONTRACT hoMaere PONTRA cT DATE: i FIG. a a ee USL REPORT NO. Gl ee JEM KEE CO. N.Y.K elastics OF SHIPS PLAN NUMBER E- 22316-A_ fa a et Any yt ery! 1 y {? i ay! \ LS ) Y ISSUE | NO. DATE al = 3 Co et vil 23K E oe OG. 5¥ 0 = R102 \ Yong ig! 25 \N Sh : NOTES cae “|= IF OUTPUT VOLTAGE UNDER LOAD |S TOO |. > HIGH, MOVE TAP ON R1O2.- bo TF OUTPUT VOLTAGE UNDER LOADS TOO. Fe Seer aes ——— a No DESGRIPTION AUTHORITY APP'CD DATE LOW, Ch ANGE PR} NEARY CONNEC TION Ped U. S$. NAVY UNDERWATER SOUND CReORATSRY FORT TRUMBULL, NEW LONDON, CONN. FROM TAP 4 TO Le MOOG ORT Fa . cI eS AED AAC MN TY FR TENET ‘ : Ais ‘ DRAWN sy DA pate. unseecteo ByYWLE pate & , : ie ‘ i - 7 ‘ 2 ri rng. | i eye j RAE 2 Rais Seba | TRAGED BY. DATE APPROVED BY WHEL DATE o> hy i] aera SCALE REPRODUCTION OF FINAL PLANS MADE . PLANDEXAMINED) & FOUND SATISFACTORY... ; Fd eal. ; : « Bale Meee ee ae ? . * v oD SSP ert SS ~ fy ¥ > i ; Feat sit ¢ x BU. SHIPS PROJECT OFFICER "COMMANDING GFFICER RS Se ane oy ee SR Meer 1 USN=USi UNI WNIT NO. 227-3 SCHEt MATIC DIAt GRAMS AMO T De POY HER SUPPLY A UNIT CONTRACT SOEAR EQUIPMENT. [Sp = IG 4 2 pate ales BUREAU OF SHIPS PLAN NUMBER “EB 22317-A | &G6O8@t-3 tee NING W314 48 LY GNNOXD SOMd LY SISSWHD O1 ONNOWD W3LSAS © AIZIHS AWBYD LON Od YOLINOW JNOHd B TOALNOD JWIL dILIWONOWHD ev Old OB ONVHD) ait 22-01 $I OJONYHD sm) ANA W-3 FP-L-L 2S neo “HoaweT AUN TIngAneL sK0s Asoivnoay] ONAOS KGLYMNIONN ZAVN "SF 3LON (ies = s. 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SOl-A e JerSio4 8 7 Lo : fie Wied = a j NoNAOTEE AG alte) ane) poe | BS2 es 201-¢ L 01-0 I-A gOl\ ert Se a ee = A ZOl-L a ae DHE dallas" ' i) loo = = S = a we £0\-2 ae ) 31411934 8 sss = z F = = z “Qa¥ 0336S G mors avTay = [|Z X30N1 OL { eer ES [ el init Sold 2 zowS mz-z7ON } © leaks Ol-d fe) BNOHAOHHIN OL} Z l= 3 Shey { 1 BSG TO) Zire { ue | < iz an ae a BOWLS ae — VON f i SS t enn OvS! W31Nd a7 ae \ \Ol-z 431 3NONCHHO ean eee LAdI9 FGA 90 AIL SAIL Ea vV3HS OL, ‘a or — O-e ¥3dYOD3% G33dS HOIH Av134 X30N| OL 60I-F NI WNSIS LoI-r g0l-r a33adS N01 33dS HOIH S¥3qxOD3Y 13N37 ANNOS OL Tati BIAW3dS YOLINOW OL FF 90I-r Sol-r FOWLS us) S3NOHAOAAIN, OL 19 ON LdOd3u 1'S'0 7 < a a a ae oa iigied’ scliease ee a ; : c Per ISSUE wea 2: 10-21-46 Lee T1TLE CHANGE ox : AMER ERT MER IEON AMER TRAN STANCOR SP-GOI3 di: ee 20\ eae _ ORSCRIPTION UTHORITY |APP'D| OATE ALTERATIONS U. S. NAVY UNDERWATER SOUND LABORATORY FORT TRUMBULL, NEW LONDON, CONN. 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UNIT USL REPORT NO | ISSUE N® DATE APAL 2 M-8-4 25 11-27-45)PIN| 5:10-3|-46 | 2 TITLE CHANGE DESCRIPTION ALTERATIONS U. S. NAVY UNDERWATER SOUND LABORATORY FORT TRUMBULL, NEW LONDON, CONN. ORWG. NO. fe SHEET._oF__ SHEETS be) Be aac orawn ev AN. cavelOcRénsrecran avi: f Sonred 2S TRACED BY. DATE appnovuo oy coated ot scace NOME ReraoDUctiON OF FINAL PLANS MADE PLAN EXAMINEO 6 FOUND SATISFACTORY of-"" f - “a. Ff) (a (ih ALA a ‘ és 7 - wet "Bu. sare teohte OFFicea COMMANDING OFFICE —USN-USL_UNITNO.5222 SCHEMATIC DIAGRAM PL. SOUND LEVEL RECORDER A UNIT OF SOFAR EQUIPMENT CONTRACT DATE CONTRACT NUNOgR BUREAU OF SHIPS PLAN NUMBER E-22314-AA G29N9H9| “1403 O2QGV OL“Ld03 ONILSIKS SLI3NNOD WOIHM\" 378VD_ONILIBNNODY3LNI 30 Ofd NO SLOVLNOD S3INHGNI {Z> ‘3LON | | €. FL AG © SOLOW 163 ASNOHONI LSA 20€-9 ANOHdOAAIW 'NIW OZ Sv Ol4 09 AOI! 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