I

i

TM . --

TECHNICAL MANUAL -- ~ • SCR-197-B. SCR-197-C.

SCR-197-E. and SCR-l97- F

Ma,. 30, .'42

,

TEC'lNI CAL W»IUll ) No . 11-241 )

( , i")

N U -241

RES't1UCTttI 771 / / ' ,")-I . / c -'~7:"

* a DEPARMm W.I.S1lINGTON, II..,. )0, 1942

IWlIO SETS SCR-l97_B. SCR-l97-c, SCR-197_D. SCR-197~E. and SCR- l97- f

Slit! I NOTICE.

•••• • ••••••••••••••• ••••••• 1

Precaution8 •••••••••••••••• •••••••••••••••••• 2

Re, u$c ltation •• .•.•.. ••••. • .••••• .•.......... J

Efrect ot .hock ... ...•...•........••......•.• 4

Tillie required tor tr •• ~nt •• •••••••••• • ••.•• 5

Other applic&UQns ot r esuscitation •.. .....•• 6

It.'TROOOCTIOti •

Dirt,rane •• betlffl,n lDOd'ls •..... •• •.. • .....•• 7

J Radio Set SCR- l97-A .... . . .. ...... •• •••••••••• 8

Required technical III&nual. • • • • • • • • • • • • • • • • • • • 9

SECTION 1. General dueription.

Physical cha rac teris t ics ••••••••••••••••••••• 10

El.eetrieal ch&ra d erhtics ...•.•. • • 0......... 11 Wa jor components and wel~ts •• . •.••• •• ••••••• 12

Tf"IIck K_l i>( · ) •••••••••.•..••••••••• • 00 ...... 13 Radio .tran~tt1ng equipment •.......... •. ..• • 14

Trailer K_19_( . ) •......•.•........ . ..•......• 15

Radio equ1paoent in trailer K- B - ( . ) ..•.••..•• 16

SECTI ON II. !)nployment .

Initial pr ocedu re •••••••• •••••••••••••••••••• 17 _ 1 _

Rf.STRICTFll

( . ) See pl.ragnpl\ 7, ~ge 6 . .. M5581:.l3

On II,...,. UNIV,~\lTY Of (AllfORNIA

'N 11_241 SIGNAL OORPS

Parasrapb

Pre1l.a1n1.ry ceution .. . , . , ..... .......... .. . 18 Connectione bet"en truck and trailer..... . 19

'I'ranalllitting equipn

RADIO SETS SCR- l97 B, C, D, E, and F.

SAn.'fT rlOTlCE

1. DAlfGEJlOOS YOLTAGI::S. - OPERATIOO OF TIllS l'I:IU:ml!iHT INVOLY.,;s Tim

USS OF II1GH POl'UITU.LS WIfICK ARE DAHGEROUS TO LIFE. 00 HOT CHANGE '!'USES

DR WAKE ADJUS'lVEmS INSIDE ~U:rnmrr "''lTH Til! HIGII-'lOl.TAGE SUPPLY ON.

DO NOT D:::!'END UPOH DOOR SWITCIIES OR I/rrERLOCKS FOR PROTECTION, !lIT

J.Ll'I,\YS SHUT 00IfN GEm1tATORS 00. crrmlI. PQIIm EQJIPWEHT. IJlI!)ER COOliJi CON-

DITIONS, DAHGEROOS P01EI'ITlJ.LS ItA! tlIST 1lI 0THDl CIRCUITS WITH PCMER cotI-

TROIS IN THE MOFF~ POSITION DUE TO CH.IJtGES ItETUNIlD BY CAPACITORS. 1'0

AVOID SIIOCKS, AUIA.IS GROUND CIRCUITS PRIOR TO 'I'OOCIIING TIIEIf.

2. PRECAVrIONS. - Since t.he un of high pot.ent.iale whi~h aNI d.an-

gerou, to hllm&n life is neceuuoy t.o the su~~euf\ll operation of t.hie

eqllipunt., ttl

nI 11-241 2-4 SIGfIAL CORPS

!:.. Q!? not ta.

ATION AND IU.INTENANCI' OF THIS ~LJIPVEm . OR snm» ~UII'll:"!'m'. IJlE URGf:ll TO BfCOYE FAlULUR WITH THE RULES Of RZSUscnAnON. BO'I'!! IN

TH&l!U AND IN "'!(~ PRACTICAL APPUCATION THmmF. IT IS THE Dun Of

ALL CCNlIUNICATION KtJI TO BE ~ARm TO GIVE ADEl;lUATE F!RST AIO AND

THEWY PREVEm AVOID.lIILE LOSS OF un:. YOUR OWN un IIAY DEPEND ON

THIS .

4. EFFECT OF SHOCK. _ ShockB received from accidental contact

with charged M&h-tene1on electrical conductor. c.ule paral.,ylll ot the

",usclee and shock to the nervous and respl r.tory systeN. Artificial

respiration ,,~ be errective it i t is Eiven 1Jmtedhtel.,. There are

varioll' method. of perto~ a rtificial r espiration, but the mo.t

errective one 11 deacribed in !.he foUowi nc .ruln .

Sr:r.'O FOR THE ND,.'tFST IlSDICAI. OfI'!CUt. ANO TKEN EVEN I F T'ltE

VICTDI .lJ'prAAS TO BE O&\ll -

- 4 _

0.., II""" UNIV,~\lTY Of (AllfORNIA

o. -RADIO SET SCR-l97 B, C, D, E, &tid 1

'llI 11-24l 4

T ndiahl.l brMk th circuit. - With. single qllick

IIIOtion, rr.. the vicU .. r..... u .. eq\li~t, but do not lay hold ot

1QU -.y alao ",ceiTe • nrioul Ihock. UM &tIY DRT HOIHXlNDUCTa!.

(clothing, rope or board) to ...... e1t1Mr thl victlll or thl wtr.. Do

not u.1 .. eW or &tIY _let .... hrial, bec.u.e th .... conduct electricity.

WhU. treeing the ncta tro. the conductor, uka anry etrort to anut

ort tIla power ~uickly.

b. In_t.a.ntl,y .ttand to the 'l'ictlll'. brMthin,s. - Aa sootl ..

tha ncU ... 1& clear ot tIM conductor, r.pidlt feal in hi. IIO\ItIl and

thro.t .. ith yl3U.r finger, and r....o ... &tIY toreign bod.r that ma,y ba

pruent (tobacco, tal.e teatb, ate. ) . QJickly rip or cut from tIla

bod.r any tight clothing .bout tha lubject'a neck, chut or .. ht,

m1ch •• collare, belta, etc., ao that i t.,,11.1 not intertare with tha

rup1ration. Th1e 1 .... ry iIIIportant, and can ba dona in a .acend or

boo RfV!Mlf7I. TIIAT EvutT II!'VfflI' OF DELAT IS DIJiGU'lOUS. Begin

artificial rupir;r.Uon at once. Procead .. t "llow,:

(1 ) Lay the eubject t.c_ downward, eith arm_ «xtended

•• streight f o .... rd .. po .. ible, and with hll head turned to ona aida

eo that the 110 .. and IIOUth .re tree tor breathing. 01._ of the arm.

lUy be bent .0 that hh hud relta on hh torearm. Let an .. Iletant

dr ... the aubject 'l tongue rorward ao t.hlt. it .. ill not ob.truct tlMl

tree pt. ... g. ot eir . •

(2) Kneel .atride ot the aubjlct'. thighe and r.cillg hh

head; rut the pt..lJu of your hande 01\ the loin. (Oil the .... ecl .. or

the ..,.ll or the bo.ck ) , with tingera Iprud over the lowest ri .....

0) With arml bald Itraight, ~ing fo ... ard alowly ao that

the "'ight of your bod¥ i_ gradually, but not v1ollntl.l, brought

to b .. ar upon the eubject. Thh act should talc, frtllll two t o three

- , Dn9, II"""

UNIV,~\lTY Of (AllfORNIA

111 U-241 4-7

second ...

SIGnAL CORPS

(4) Th.n ilamodiat.ly .. 11Ig backward •• 0 .... to remo.,. the

preulU"Cl, thus rsturn11lg to the VOBit i Oli de.cribed under (2).

12 to 15 tines a lllinute. corresponding to a compbte respiration 111

four to fin, "econd •.

(6) Continue the artificial ",,,pirati,,,, , witl>out inter-

ruption, until natural breathing is reato",d, or until a physician

"lTiv.... If natural breathing ,top, after b,ing restored, u,e

art1!icial respiration again.

(7) DO NOT GIVE ANY LIQUID BY .YOI1I'H UNTIL TKE SUBJECT IS

I'UUY CONSCIruS.

(8) Give the .ubJ,ct fruh air, but k .. p b.iJI!. w..".. .

Blank.te may b. placed undlr the INbJect whU, artificial respiratioa

i, being carried on.

5. TIllE REQUIRED ltR TRlA'DLEI(!'. - DON'T GIVE UPJ RECOYmI K.U

BE SLCM'J KEEl' UP ARTIfICUL ~IP.ATIOH FOR AT LHJ.ST TKREE KOORS.

6. OTImR APPUCATIONS OF RESUSCITATION. - The pron.e-preuure

lII.thod of artiiicial r"piration herein deaeribed 11 eq"ally appl1eabl.,

art.r clearing the JaOUth and throat of froth, to the relN.citation of

the apparently drowned, and aJ.ao to ea ... of eusponded rupiration due

to the inhalation of gas or to other cau .. e ...

7. DIFFERENCrs BE'I'ifmI J,ICllE.LS. - Radio Set .. Sca- l9'7-D, SCB-l97-

RADIO SE'l' SCR-197- B, C, D, E, and F Tit 11-241

7-' thie will be underetooci to cover all five redio 3ete mentioned ebove.

SioU1erly, ref"",nce 11 made to Truck 11-18-(*) and Tr .. U er 11-19-(*),

to cover identic&]. vehic1u ot difterent procUl'iIIOtIIlti.

8. RADIO SET SCR- 197- A. - Radic Set SCR- l97-A i. not included in

this lUIlua1 because it is different in de8ign and CO

TIl 11-2I.l 10 SIGNAl. CORPS

SECTION I

GENFlW. DESCRlPTICII'

••••••••••••••••••••••••••••••••••••

PATllgraph

10

Elactr ical charactar18t.ica . . ...... . .•.. .............. . . ... .. II

""Jor componant.a and weight. . . . ........... ... ...... .. ........ 12

Truck K_18_(*) ..•... . .................. ......... ............ 1)

Radio tranwtt1n.g lquipment ........................ . .. ... . . 14

Tra.iler X-19- (* ) ......................... .. .. .. ........... . . 15

Radi o eoquipDent in Tra.UI .. X-l9-{*) ......................... 10 . PHYSICAL Cfl.l.RACTERISTICS. - Radio Set sea- l97- Ca ) h a high-

power portable radio at.&t1on. Thl tranllll.ittillg tquiprnent 11 in,tilled

in Tl"'IIck X_l8-{O) and the receiving equipnent ie inat.&Ued in traUar

X-19-(0) . eo-erci&l lOUl'C" oC power ATI u.ed when evaibble. lAoao-

line_angine driven power unite Cor both t.he trenOlmitting IUId .-.elirlnf;

The trlUlandt"'r may be rcotel,y controllad u.ing voica, tona, or c_

oparation Crca remote politiona up to • dh't.&nee of 7- 1/2 IIUa. bT

meana of eaaereiai telephone lilIu oC Wu-. W-1lO Un... DIIr1ng fhld

oparationa, Truck 1:- 18-(.) tow, Tranar 1-19-(0) to tha .-.eabing

location. Tha t.raUer h dtuated at thl. location and tha Truck 1-18-(* )

proceed, t o the tranllllitting loeation. J'igura 1 ,how, • complete Ra.dio

SlIt sex- l97- Co ).

-, -Dn9. II"""

UNIV,~\lTY Of (AllfORNIA

ft.UlIO SETS SCR-197 S, C, D, I , W ,.

< • ~

• -, • • , • • • • • ,-'. • • -• , '" _. , '" -• • • • • , •• ~. • - , , . • • • • • , • " • u • • • -• • • • • • • •• • • • & " • • • • , • • ,

_1 0 - 41 -' - 9 -

"""",. U~II'f.~~I1Y Of ,,\IIFalNlA

'DI 11-241 11-12 SIGNAL CORPS

11 . ELECTRICAL C!WU.CTmISTCS . -

f'Nqvener Ral1811 Tranu.ittlU" - 1, 500-18,000 kllocyclu

R&d.1o Receiver BC- )42- (* ) l , ~18,ooo kUoeyclu

Vonitor Receiver - 540 Idlocyel .. - t.4 Mg.eyel ..

Power Output , Tranwttlr: _ c-w (Telegraph) JOO-4OO .. ttl

voiel and Tone 12S-ISO .. tt.

C-W (Talegraph) -l> " l,SCO 1111 .. )Dapand1 ng )upon sld.p Voice and Toni - l> " 2SO IIllI, )d.i,tancl . )511 Par_

)graph )0.

12. kAJOR COWPOIlWI'S AND WEIGHTS . -

!:. Truck ](-18-(* ); total _ight loaded, 9100 poW"ld8. Inelud ..

the (o11ow1l18:

Components

RADIO SET SCR-197- 8, C, 0

Contrel Unit R!I -7-(")

Antenna Iqui]:Qent

Gene .. ator GN-42-(*)

Weights

8)4 pounda.

66 pGWKIa.

6) pound • •

270 poWlda ,

2. trailer )(- I9-(*)j total .... ight loaded 6, 600 pound • . Includes the (o11O'JdI18 :

Cmponenta Weights

) Radio Reeeiven BC-)42-(* ) 45 pound. Nch

1 Vonitor receiver (Ilallicratt ...

"SI

RADIO SETS SCR- l97 B, C, D, E, and F.

l). TRUCK )( -18-(" ) .* _ Tru.ck ~-le- (~ ) . uaed ... part or Rad i o

Set SCR- l97- (ft), is of the cab-over- engine type at construction and

1. equ1PP"d with a six cy1inder engine developing approx l"stely 90 hp

at )500 rpm. It is cap"bb ot a:aint.6.ining a .peed ot 45 .,iln per hour

on fbt ground with ite tot&! l oad and should climb a J% grade in high

gear. Other infonnation concemin8 Truck 11.-18- ( " ) is contained in tne

_intenance l!I&lluel and nriOlla datt.. eheet. lJU ppUed with thil .... hid •.

14. RADIO TRAHSIH'lTING EQU IPIIENT. - Til, r&dio-tr an&m1tting equip-

ment .. in.t&.lled in Truck l(-l8- ( *) .... manufa ctured by the Fllderfol..

ponflllta at tile t r anw tting equlJl!1ent 11 contained in 'N ll-aJ3.

Figures 2, ), and 4 ars inaide views at Truck K- l8- (*) , ahowing the

*1Iota: In ca. e ot _ergeflCY, the trailer can be aoved bJ' an,y t ruck

with a coupling .. e chani ... . hich "ill. attach satisractori ly. Th. truck

ia then r *t.rr.d to LI a "pr ime IIIOv'r ."

H -

Dn9. II""" UNIV,~\lTY Of GI.llfORNIA

•

•

TV 11-241

"

_ 12 _

UNIVERS",", "0: ~i~1A

• -• -, --, • • 0 / " • • -, --• -, • N " , • • • I • -• , • • • 0 -• • • • " " 0 l -> , •

N

• • > • -•

J

RAtlIO SETS SCR- l97 B. C. D. ! . and Y o

- 13 -

0.'9' .I/rom UNIVE~\lTY Of CAlifORNIA

'DI 11-241 14

• " , ~

TV ll-241 14 SIGNAl. CORP,

FREQUENCY METER--

Fl",re 4 . - Vh_ of t il. dr i n r'. cab or 1'ruftl< 1( - 18- { - ) .

- 14 -

Or > .I/rom UNIVE~\lTY Of CAlifORNIA

,

RADIO SETS SCR-l97 B. C, D, E. and F •

.. radio receiving etntion UId .. cOCllpl.t ..... u.s. c.nter .m.n fi.ld.

n1tchbo&roa, teletyp~iter •• and typewriten ne iMhUed. Thue

it ..... are not furn1~hed Ie componenta of Radio Set SCR-l97- {. ), but

Jl:Ust be requieitioned ~ep&r .. telJr. Additional infonD&tion COI\c.m1ng

Trailer K_l9-{·), 18 contllined in the appendix.

16. RADIO EQUIPKENT IN TRAILER K_l9-(.). _ a. Radio R~eiver

llC-J42-(.). Three Radio Recdvus BC-J42-{.j are installed on the

.hele in the forward part or the traller . (See Fig. 5) Then receiver.

obta.1n their power frClln the a-c outlet. aitUllted in the fonnr.ro part

of the traller. Full infol"ll\Stion concerning Radio Recdver I!C- J42-{. )

h contained in ru 11_850.

- 15 -

Dn9. II""" UNIV,~\lTY Of (AllfORNIA

SIGIlU. \XitPS

- 16 _

~, -UNIVE~\lTY Of CAlifORNIA

• " " • • • " , , • ~ . • • -. • • • • ~~ •• • - • -. • • q " 0 • 0 0 • , " • • • , 0 n -0 • • , 0 .-.' 0 • • , --0 • C· _. > 0 • , • • • 0 • -•

tM.IItO_U_1

RADIO s;;r, SClt-l97 B, C, D, Z, .no:! P.

- 17 -

(

-

• UhIV[RSITI or (ALIHIIN1~

• -~ , 0 , • ---,

• -, " • • --'-• 0 • 0 -• • • • • • • -• -• • • • •• • • • .. -• ". • 0 • • • I: , • • • • 5 , • • • • ~ -•

TIl 11-24l. 16 SICNAL CORPS

b. Ilonitor rece i vn . Th 010n1tor receinr 11 I comurc1el

Wlit, the Helll"r&ttere ~Sky Ch.a.inpion", mod.l S2OR, !D.""",t ed on a Ih.lt

abon the operat ing table. Th1l 11 a nin.-tube rec .. lver Ilaving a tre-

quancy rang .. , in tour bandl, trOOl $40 kUoeycl .. to to4 megacycle.. 4

loudepeaker 11 built into the "abinet, and a ja"k on the tront pan .. l

permitl the conn .. ction at e h .. d .... t. While thia receiver 11 intended

pr 1J».rily f or monitoring the .ignall at Rad.1o Tranllll'llttAr 8:-)25- (* ) ,

i t 11 ueeful al.o tor g .. nenJ. rec.ption pUrpO ... .

i' Cent rol Unit RIl-7-{* ) . - en .. Control Unit RIl-1- (*),

connected tor .....ate opera tion, 11 in.talled on the operatl..nfi: table

directl.,y ben. .. th the mod.l radio rlcllver . T11.1I unit ... "eiv .. itl

po-Hr trom one ot the 1-

.. 11-241 IUDIO S!rS SCft.-l97 .11, C, I), I, and 1' . 16

,,, ,.\In 1 . - lIItthocl of "OUtlt1~ ~.r Un.1h PE- 15- ( . ) 1n till rur aOlllpart.ment ot Tr,Un 1 - 19-{o j .

- 19 -

0.'9' .I/rom UNIVE~\lTY Of CAlifORNIA

SIGIl.t.L CORPS

!. Anter1J\aa . _ Normally three vertle&1 antenn .. , .. ch composed

ot loIast Sections kS-49 to l4S-5J, includ'lfl , are used. '!tIese are erected

on Wast Bases 1!P-14 IIIOUnted on the tront or the trailer. U an &lte .....

native , single wir. entenn.a.s ma,y be strung to nearb,. trees or other

supports and connected to the proper lead-in insulators. Trailer

)(-19-(. ) i. equipped rlth two copper screen root antenna>! . One ot these

is use

RADIO SEI' SCft-l97 B, C, 0, E, and Y.

S&::Tlai II

•••••••••••••• ••••• •••••• ••••••••••••• ••••••

••••••••••••••••••••••••••••••••••••••••••

'hi ll-24l 11-19

Paragraph

17

18

COrInect.iona Mt.w'." t.ruck and t.ra.iler •. ....•...•••.••• ••• .... 19

tl-an .. it.t.1n

tr&ller K_l9- {e ), ant.anna and power reql11r ... enta .... ..• •• .... 2l

tl-&iler 1t-19-{"" ) . control

frill,r )[-19-{'), cordin«

un.! t. .............................. .

•••••••••••• •• • • • • ••• • • •• • • • ••••• ••• " "

Iklnit.or receiver............................................. 24

11. lNITL\l. PROCEDURE. - This equipment. h nom']],. provided with

un:r . p .... psrt.s . pa,y particular at.t.-ntion to t.ha large t.ran..dt.t.in&

tub .. for Radio Tnn-.it.hr BC-~(e). Inspect. t.h .. e t.UM&, " p4chll,.

the fU~t.s, for Qlechanicel. breakage &e eoon &I ,...,dved. R.,.,.,a all

OO..-ere from t.he equipmsnt. and inspact. all _t.en for breakaga.

16. PRETTlIDiARl CAIJl'ICIi. - Do not. operat.a IZI¥ of Wa aq"uplllent.

'1thout. Urat. r&ad1n« all pert.inent. instructions furnish..".

19. CONNECTIONS BE:I'WWi TRUCK AND TRUUJ!.. - It. h int.end..:1 that

Traile r K_l9-(e ) dll be coupled to Truck K_l6-(e ) and towed. to t.he

receiving location. The trailer will be discoMact.ed .. described in

J.ppendiJ: 1. Connae t. ho linn of Wire 'N-110 carried on aaall Dft-4 in

Tl'I1ck K-l8- ( e) bebun tha t.nIck tenuinab and Cord CD-31J in Triller

~-19-( '), bein(: cert&in tha.t lin .. 2!:!!. and!!!2: from t.he t.nIck U'I

COrTect.l,r eonneet.ed. t.o linn .2!!.!. and ho in the t.ra1ler. Facina the

r lar of the t.ruck, u.n. on. h on t.he right and line t.wo h on t.he

lett. of Truck K-16. Truck K-l8-( e j can then be driven to the des-

19m.t.ed. location and pr. p .... d for operat.1on. E:d.at.ing telephone linea

oan be used. in plac. of Wu-. W-UO.

-n-

Dn9, II""" UNIV,~\lTY Of (AllfORNIA

TIl: 11-241 20 SlGN,I,L CORPS

20. TRANSMITTING EQUIPMENT IN TlUJCK 1t-18-(.). - Th .... 1nst.ructions

u. conden •• d and u. in .ddition t.o infon.at.ion contained in TIl 11-«1,.

St.\IdJ' t.he lat.ter cu~ful.ly bafon .t.t.llllpt.1ng to operate t.h. equipment..

a. Wodul..t1on and k'yin, contr oh. In the c,.part.ment iaaecii-

.t..ly billow th~ ant.enn. t.un1n& cOlllputaent UI locat.ed t.1IT ... ell

knob. wh.1ch cont.rol t.h. percentage lDOdulaUon on t.onl, In,)' of thl t.1IT ..

toni frequmc1l1, and the t7J>ll of keying (h.igh and low .peld) . (II

low- lpe.d keying (up to 80 words per iUnute) t.h. oscillator is k.y.d.

Q:1 high-ap'ed. k.ying (80 to 200 word. per ainut.e) t.h. oscillator rune

Continuoully IlId t.he !irat. 1nt.el'l!lediate a.npU!i'r is keyed. Place t.he

coot.rola in • polition Which will give t.h. dedred. operat.1on.

b . Power Panel. - The .. it.ch .. on the power panel in till

HU of the truck are pla1nly Il'Uked and ael!- Upl&natory. If cO"'er-

eial 110= or 220-.. 01t. . _c power h uaed, be sure t.hat. till linea u.

correctly connect.ed t.o the terminal. in t.h. connection poait.ion adJ.c .... t.

to t.he pol'er pan.l OJI t he aid. of t.he tabl •.

, . - Generator 08-42- (. ). - For aaergency oper.t.ion of Genera-tor GH- 42- (. ), f irat. ch.ck t.o a .. t.hat. t.he swit.ch labeled UliRGiNCY on

t.he po .... r control panel at the rear of the truck and tha ew1t.ch on t.h.

frequenc1 aeter in the t.ruck cab are t.hrOI'lll t.o the ON poait.ion . Place

tlla t.TUck gaua in neutral position, ""ah down the clut.ch and operat.e

the glnerator power t.ak.-o!f cont.rol located on t.1I1 cab nOQr beside t.he

driver' s aaat. ()lote: Two different. t.ypes of power t.ake-off cont.rola

"ill be found in diCr.rent procur""lnta oC TrII.ck K-l8-(.) . In_a

mod.eh the control 1m located. at thl l~ft. of t.hl driver', se.t and 1,

eng.ged when it: 1m pushed down; in other goodlh, the cont.NI 11 to tile

right. oC t.he driver's .eat. and engaged "hen pulled.!:!l!') Wi t h t.he

mgin~ idl1n&, lat. out. the clut.ch pedal ,lowly unt.il t.he generator

- 22 -

, .. Dn9, o! I""" UNIV,~\lTY Of (AllfORNIA

RADIO SETS SCII.- l91 e, C, D, 1:; , .,,01 F. Til 11- 2U

'" 11 set in r ot.tion. SlOlll,r increase the trllck engine spe8d untU t he

frequency ... tor in t he trllck cab indicatea a f r equency or bO cyelea.

The hand tl'lrottle .... y have t.o be ruet as t hs JIIotor speed inCr8S501 dur-

ing the prelblnary war.a1ng up pe r iod. or ..-hon the generator i o loaded.

anjl!j!.ed tor oporatior with !h!. truck .l:!:! tIIOtiOIl. It the generator

"hunts" Cor operating opeed, caoJaino unsteadiness ot line voUege, adjust

tile volt.a(;e regulator located under the table according to diNictions in

TV ll-805 . It the generat.or ~Y" bel ta c an be heard Ilapping, loosen the

generator floor bolta and tighten the take- up bolt slightly. It.uy be

n.ceau .... y to make this adjust.olent during the first C_ hours ot

operetion.

,. Starting .!2!! tuning . - Place the TUNE-OPllRATE swi t ch in -TUllE posit ion. Plece the CW-TONE-'IOICE switch in (:N posit ion. Ii.t the

loooer lett of th .. pan .. l, Just abova tha upper comer of·th .. dust tilter,

10 located tho IHPll'l' .1'OWlill switch . Throw t id .. t o t he 011 position.

Throw the PLATE S'TA!lD-el switch to the OFF poaiticx\ . PreSI the START

button and the various relaye will be heard oper ating within the trans-

.,itter . Set the tila ... nt &lid line voUage meter t.o ttle 110 volt red

mark by !llltans ot the DlPll'l'-POIIER voltaee Nlgulat.or and lock the latter

in pos ition. Altar)) secondo, the tll&lllenh will be ....... and the

J)-.,scond t1:u.s delay relay should oper ate. Sat the FilD]lIEM"C! RAtlGE

switch tor U.e required out put tNiquency. Set the oscillator grid dial

r eading tor the r equired output frequency, .. indicated in TIl 11-905.

Ad just the olclllat.or plate tuning, the first LA. tunina &1101 the

s e cond LA. tuning for mnh' w> grid...n-ive in the foaoring positions.

ThroW the plata STAJID-IIY switch to the 0tI posiUon. Push the TlIST KEY

to the lIP posiUon. Tune the P.A. tuning for ,u1l1,rg. ... P. A. plata

c urrent. Set tile f ollOWing switches for the requi red frequellcy

, Dn9. II""" UNIV,~\lTY Of (AllfORNIA

output .. 11ldicat.ed 111 'N 1l-!l)5, tha ANTENNA TltANSmI switch, tha

.\NI'l!:NIIA 1'\INlNG anteh, and tile OOENNA ImlOCM 'UPS "witch. Incren.

tha AIi1EHNA COUPLING CONTROL until the P. A. pbte curr .. nt meter indi-

catu about 150 m.1lli&lllperu . Throw tile TI.IIfE-oFffiATE .>I1tch to the

OPElU.TE po.ition. 7IIe I' . A. plaU> currant .... Ur .hould read. about )60

e. Tuning!l!! tranlllUtter .!:2!. selected tresu .... \c!. - The

tranllllL1twr has a ..... t er oscjll. t or and positiDllS tor fivto crystals.

The CRYS'l'll-tl . O. switch located on tile oac1.llator piUlel. on U.e lower

~t of the trane.:o.itUr pan~l should be nt t o the d",,1red operation.

The ran.o;e selector switch on the i"ront piUlel controh ten freql,lency

uns"" as .o;i".,n in tha following bbla: _. 'lelector Switch Position

, , 4 , 6

7

, ,

10

1,820-2,150

2.150-2..bOO

Oscillator Frequency Range 111 KQ

750-1 ,8al

750-1,)210

750-1,)Xl

2,bOO-),700 1,300-2,250

),700-5,JJQ 750-1, )210

7, 550-10,400 750-1,)('0

10 ,1000-13 , 400 1,)00-2,250

l3.loOO-lh,l00 1 .):)0-2,250

lh.l00-18,OOO 1.))0-2.,250

'1'0 obtain Oscillator ,""quancy div~de output Frequency by

, , , , 4

4

, , , ,

Crystal used on thia ranga nws t be witbin the f ollowing ~s

750- 910 Icc

910-1, 075 kc

1, 075- 1, )Xl Icc

1 , ):)0-1, 1.50 kc

925-1,)25 kc

1 , 325- 1,886 kc

94/0-1.))) kc

1,)00-1.1.75 kc

1.1.75- 2. 01) kc

2.,01}-2.,250 kc

The oti&l settings tor Ule frequency for various r&l'lll\a switch

positions slooom ahove ue found in the cbarts au.pplied o;ith the trlfolll-

Glitter. Use Frequency Ueter Sat 5CR- 2ll- (" ) 111 satt11lg up the freql,lency

channels in tha transtlitter whm ua11lg the matter oscillator.

- 24 -

0.., II""" UNIV,~\lTY Of (AllfORNIA

RADIO SETS SCR-l97 B, C, 0, E, and f.

TUning exampl" , To s"t. up Ute uan", .. itUr f or 16.0Cl0 kilocyclu. Aa

indic.t.ed in. t.he foregoing chan. t.l, h !nquency Comea " Uhin rang" 9.

'0 t.um the fl.,lJ«;Jo; S!UX;'tCfI SWItcH to range 9 . Again. as indicated in

t.'e chart, divide the out.put frequency Ib,OOO kilocycles by 8, obtain-

ing 2 , ClC() kilocycle". Read oppo"it.e 2.0Cl0 kilocyelee, on t.he oscillator

eha.rt on the panel of the tranllmitter , the OSCIUJ.tM GIUO DI.U. settir!&.

The dial s ettings for all the f ollowing changes Clll be obt.ained rr.:.

the chart" suppUed with the trans,.itUr. 00 not IOttempt t o tune Ute

t.l"anam1tter lI"1t.hout ref"rring to the tu.n1.ng curve". as it ..... y be possi_

bl" to t une 'alI" of Ule Jmnedhte ste.ge. to the -..rong Ilunoonica. Aa can ~ seen trOll th" aoov.o charts , • cr,." tal 1O.""t. be within a c"rt.ain

frequency range t. o be used on s particular band. In t.he pr oce .. ot

tuning the various "t,,£e .. t o r esonance. t he grid meters ofter the be .. t

indication of tuning. Thia is part1cular l.7 true in the cue of the

03clllator plate circu1t. tuning.

!. AntetVla t uning. - The ant"nna. coupUng control "hould be

l"ft at zero until the power &lnpl1t1er 1s t:..ned. Place all antenna

tuning controh a ccording t o instruc t ions cont4ined in the charts

supplied with the tranllJlit te>:". Advance th .. antenna coupling control

\1111..11 the power Uj.>lifi"r plate curr"nt incr eun about 20 mUU_peru,

t hen vary t.he A.lfTENNA tlilllJlG CAPACITOR until Ute plate current paue!,

through a defin1 te peak . It the plate curr ent polak is extre.:.ely br oad

and 1. over 150 .. llliMlp .. ns, reduce t he coupling until one definite

peak of plate current 1e obtaine4, than incnau the coupllnt; until

the plate current is about ISO otilliamper u . ThrO"lf the TUNr,....opJ,lU.T!

pitch to the operating position. thereby increa&ing the plat e voltage

on the power uplifhr t o 2,1XlO volta. S.etWle the poo

TIl: U-241 ., SIGNAL CORPS c\UTent "ach ... )20 lII1111amperee. Again check the antfllllla tUlling tor

Nxl._ plate current. and tha plat.e t.uning tor lllinill1.a plate current..

Throwing the Ct\'-TOt/E-VOlCE p itch to TCfIE or VOICE ahould red.u~e tn.

power &IIIpl1t1er plate current to l.OO "l)]lampere •. KarE, Kever ~!!!l

tuning unl .... ~ CW-TOHE-VOICE switch 1! ~ £! position.

21. TRHI.FJI. ,,-19- (* ). ANTENlI,I.,I.N[) '"""'Dt J!Wl/IlIQIE'NrS. - II stated.

in paragraph 20, the traUer .m he towed h,. 'rruck K-l9-(a) to the

re~abing lo~ation and uncoupled. Erect the three recainng antennae

on the three hit Baue KP-U inetalled at the tront end ot the trailer.

Orbe the Stake GP-8 into the ground near t.he tront ot the trailer and

conne~t the .lze flo

WIO S!:rS SCa-l97 B, C, D, E, and II.

-" -,,,..11,,,,,,

UNII'[R\lTY Of CoI.LlfOItNlA

'N 11-2I.l 21

• • " • ~ :; ! -•

,!.!

:~ • •• . -.. • • "" 2' u. , • -• ~ •

TV 11- 241 22- 23 SIGHAL CORPS

22. TRAILER K- 19_ (*), CCt/TlWL lniIT. - Before placing COIItrol Un:!.t

1!U-7-(*) in op lDOdulatlOll is obtained in thll trf,l\em.ittllr &8 indicah4 by a

dllflact.ion to - 5 db of thll power lllYlIl mllhr 598 . In a4ditlon, tha

llOCIulation indicator in t.he upper ri&ht hand comer of t.he l.ranlKUU .. r

P"'I.l should show a t.rlangular pattern with 100; ao

RADIO s.."TS SCR-197-B, C, D, E, and 1" . TI.! 11- 241

" r elays in Radio Rec e iver. OC- Jl.2- (" } . It will not be neceuary to can-

Ilf'ct the r eceiver re lay circuit. to the control unit Wlle • • the t ran._

!!litter Ilnd the r eceivers are operated very r>ear each ot he r Or on the

....."" frequency . (See Figures 9 , 10, and 11.)

-" -Dn9, II"""

UNIV,~\lTY Of (AllfORNIA

•

•

- ~J--. .' ~ .' .' ., .-.' -' '. ' -

c • > • 0 • c • 0 e • 0 •

o • ,-. ~ o . . , 0,

c • ,-.-0' .' c ,

I

SIGNAl OORPS

• ~

• -, • -, • • • --• • 0 • -• • , i 0

O~ O ! 0

0 • • 'i ' -• '@ • • • • 0

,

• • , 0 -•

- )0 -

.

, ~. ,

i • r

z , -, t : ~ , , , I

I" I" I. I" , . I I

PO~ER- -t ENTfIAN CE

80'

INPUT- liD VOLTS -liD CYCLU

•

I I I POWER : PAN E L

I

o.

NOTE :

EXHAUST FAN AT fRONT OF

TRAILER

SW DOWN-FAN II HEATER

A C U 'IE SH4LL NOT liE GIIOU'IOE Q. P,:, DENOTES PAUl

TL- 39tq

Fi c"re 10. - Ph ' .... . of . .... • i~h" In Tr .. U.r 1-19- ( . }.

~ c • a ~ ~ w • o • o •

" • • ~ • •

~

~ ~

,

• " ~ '0 ". ~

, ~ ,

BRAKE AWAY SWITCH

TL - :I930

--.. -•• Ir " •

-- ---- --

• • ~=- n-=:i: · ' , .

= --=,

-- - - - -- -- ---- - - - -.. Flr;ure 11 . _ Dh r; r .. ' r;>f cI - e .. i T!"" In tull.r K_19_ ( o ) .

~

til' ~

• ~ ~

i

RADIO SETS SCR- l97 a , C, 0 , ~, and P.

24 . MONI1"O!t RECEIVER. _ To turn on the .... ceh'er , ,turn the TONE Icnob

'I\( 11-24]. 25-26 SI GNAL CORPS

SECTI ON III

DETAlLED FUNCTIONI)(G or PARTS

FUnctioning of major e~ponents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Par&gl'aph

Wonitor receiver...... .•...•.......•.....................•.•.. ~

25. FUNCTIONING or KAJOR C~h"I'S. - The detailed f u.nctiOlling

of the .... Jor cDGIpor!ent s of Radio Set SCR-l97- (-) is described in the

individual teehnical manuala listed in paragraph 9.

26. .II0NlTCR RECEIVER. _ The monit or receiver ia a convantional

ure 12. Its eomplete schematic d1aV"'" 1a shearn. as figure 13. from

left t.o r1~t., the t.i>t>e t\lnCt1oM are as f ollow" Type VT-ll7 (bSK7),

r-f I.IIIpl1fhr; Type VT- 1.07 (bKS) , ccmbinat101l mixer and Il1gh frequeney

oseillat.orj Type VT1l7 (bS!;7), second 1-f I.IIIpliCierj Type VT-IO)

(bsQ7), ccabination seeond detector, ayC, f1r! t. a_f I.IIIpl1fierj Type

1/1'-66-.1. (6f6.G), audio out.put.j Type VT-90 (6110), aut.omat.ie noise lindt.erj

Type VT- 91.- 1. (6J5Gf). beat.- frequency oacillat.orj and Type VT- oo (00) ,

power rectifier. The int.ermediat41 frequeney ia 455 klloeyelu .

The nngu covered by the foW' positions of the band s.,,1t.eh are

a. f "Uo."s:

Band CovenS"

1 540 t.o 1770 kilocycles.

2 1. 72 t.o 5.4 lIleg .. eye1es.

4 15.2 to 44 megacyclu.

The main tu.ning dial, whieh appears behind the large eacut.cheo n,

ia calibrated in Idlocycbs on band 1 and in megaeyeles on the ot.her

three bands. Thue figures are aecurate only when the band spread dial

is at. O.

- J4 -

Dn9. II""" UNIV,~\lTY Of (AllfORNIA

I

IU.DIO sm 9CR-l91 e, C, D, E, and. ,. .

- )5 -

l -" UNIV(~SITY Of (AUfORNlA

.. 11.-'" "

• " ,; , , ~ • -i I -• • " -, " , • • , ~

'N 11- 24l 26

.. I

SIGNAL CO!lJ'S

1\1

ll'iP ,! I!~ ' 0 II

051.. ~!. ~~

~~~I ~~~

- )6 _

• " • • -• • • " " • --• i • • --• • • " u • -• ---• • , • " , • • -• " ~ -"

General

IWlIO S:e."'TS SCR-l97 B, C, 0 , E, and f.

SEC'l'IOtI IV

SmVICIHG lND REPAIR

............................. , ... , .............. ,"', ..

TIl 11-24l 27- 28

Paragraph

lIan1tor rece i ver .............................................. 28

!'ruck and tr&U.r . . . . . ...... .................................. 29

27. GElI

1'111 11.-241

" SICNAL CORPS The location ot the following trinnen and p.odd" u can be

detemined by ref,rr1n!i to the top and bottOCl chae~1, vi"" , . figur" 14 .

ill pad adju, tJllenh are for th" 10_ fNt'lu"ncy end of eaetl band, "hile

ttle trinwner' "''' for the high-frequency "nds.

_ )8 _

0.., II""" UNIV,~\lTY Of (AllfORNIA

IU.DlO SITS 3CIlo-197 B, C, D, '!!: , and F.

~ ~ -,.'

~~.

11.,. _

c,; .... C, c,-•••• I:oa"" .... "c •••• c:".c;,I1;1;o •••• , • , .

---"F E ."

OKllLUOII

M.'.

AllnllU

~e8 e e liiJ8

_ . u . _ - "'~ '."CII t ONYtIIOL MAIII -. ,-" _ ..

-A_'''''Y

"

TL·J'I'-1J

N.r:u" 14. - fIott om, batk and top chan t. n_ or the 1OIXl1tor r..:e1,. ... ,

- 39 -

-=n: ... IIII\'ERSIlY Of (AlIfO!:NIA

SIGNAL CORPS

In order to gilt at the r-t tr1Jrlnere, tile guanntee card can

it in pl.ace. So tll.l.t most eaUotacto'7 adjuotment ot tile tr1=ers and

pt.ddel"e can be IMde, "l"OCk" tile condenaer gAng "Cron tile signal bein,g

deliTeI"ed by tile genen.tor until eacll circuit IIa.e been accurately peaked • ..... 1

2

J

4

1400 kc AdJuet CA Cs CF

C" CF "

Pad at

600 k' Adjuet Pad Band 1

,. Adjuat Pad Band 2 (Top Ghania)

7a AdJuat Pad Band. )

17. No pad On thie Band

29. TRUCK AND TRATI.ElI. - Theu will need til. u.rual Ca re requ1reod

by e.n,:y hea..,. Yohie.le. Coneult the special maintenance OI&lnl&le, pl"epared

by th" ll\anute.cturel"e, which are tum1ehed with the equipDO!nt.

- '" -Dn9. II"""

UNIV,~\lTY Of (AllfORNIA

1Wl1O SETS SCR-197 B. C. D. E. mel F.

~lOM V

TV 11_2P JO

SUPPUmlITARY DATA AND TABLES OF REPLACEABLE PARTS

Parayaph.

C mie.tion range.. ........... ........................ .. .. )0

~ueney separation of .tationa •••••..••••••••••••••••••••• )1

Ponr lina. ................................................. )2

Yel'l'un

u.t of

................................... ... ............... eomponent ..................... .... ... .. . .. ...... .. .. " )4

I!onitor reeeiver, table ot replaeeable parh ..... .•. . • .•• . •• )~

R&plaCHble part., other .... Jor componenta •.•.•••. . .• .. •. . .•• 36

30. CClOMIICATIOIi R.UI(lE . _!. Tile III&lIJ' at4loapheric mel tern.1n

conditiona altectina the propagation of radio waves lII&ke a d .. f1n1te

.t&t.,,,mt ot ccamun1cation range lmpouibl... It ia necessary that a

frequency be aelected which will provide rel iabl e c~cat10n over

• f1xed. dishnce. The choice of frequency depend. upon the cliAlate,

the ,enon of the year, the time of df.Y. &nd the pnvailing &tmo.pheric

eQooit10na. ThUI, durina certain period". it is pouible by eelection

of the proper trequency and tranaalit ting location to Nintdn good

e_unicat1on with thia radio nt OVer man,y hundred. of mile,. !!eeaun

of & "ky wave phe~non Imown aa ~8kip dietanceR, there will be &0-

eilled "dead" &rea. beglnn1,,& &'\)'Where frOlll 2, mil", to 50 mil .. from the transmittin8 locati on. and eneming tram Iwrox:l.nlatel¥ 100 miln

.t the lower freql,lcnciea to infinity at the higher frequencies.

Within thi. "deed" arel there w111 either be no 81gna.l at all . or the

e~ w111 be very errat ic "nd not dependable for lIIilit o.ry c"""",mica-

tion. The followin,g reliabl e cOl!rNllieation renge" 1M.}' be eJqlechd within

the ground wave r&ni:e on 16,lXlO kilocycles:

40 alil .. 35 alile.

-41-

VOICE

30 III1lea

Dn9. II""" UNIV,~\lTY Of (AllfORNIA

TIll 11-24l )0 SIGnAL CORPS

Thia hbult.Uon should not be taken as the rull capability ot the tralUl_

lllitter , bllt u • li1nihtion ot the hieh-frequency end ot the band. This

can be aeen tT'Olll any or the graphe 111 figures 15, 16, 17, or 16. For

inatance, irt Ci3Ul"" 15 • .mich includn the predictioM for a s"""",r day

ot 1941* on 18,000 kc (18 .... gacyclea). dependable cOll'lllWlication NY b"

obtained wUhin the range or approximately )0 miln . HOl«lver. on a

rrequeney or 6.000 ke (6 megacyeln) , dependable cOlllllwllcation rM.¥ be

expected over a range ot 600 miles . ill e , timetea are tor radiotele-

phone cllmlrt>lnicatlon. Also at a frequency ot 12,000 kc (12 megaeycln)

dependable coraunication III&J' be obtained up to 35 milea , at which th"

~8k1p di.taneeW begins and extenlb to approrlmAtely 600 miln . ThWl.

no ccmnwdcation will be dependable trOll! JO to 600 milea or beyond 2.100

miles. Ir"" consider fitiure 18 for the ,....., frequeney of 12 "",gac,..:les,

and it can be seen that for a winter night 1941-42, no dependable com-

"",nicetion can be ~cted beyond 38 miles, while at 2,000 kc dependable

cOl:l:lUnication rrJJ:J he eXJl

'IV 11- 241. RADIO SETS SCR-l 97 B. C, 0, E, a!lCi F. 30

gat.ion of a "ground wave" alon.

'N 1l- 241 )0

"

SICNA!. CORPS

- 44 -

0.., II""" UNIV,~\lTY Of (AllfORNIA

• • , • , • ,

, • • i • • •

, , • • -• • • -• , • • " ! , • " 0 , • • > " , w , • • -• " , " -"

, ~, -• • • • • -• •

f. -" " ! , • " 0 , • • > " , w

• -

,! ! I ! ,

, •

• • , • •

i -...

, ,

• ... . ,

, • , ,

, • , , , , ,

• , • , • , • , , • • ... . • , • F , • l-

RAIllO SETS SCR- l97 B, C, 0, E, and F. 'IV 11- 24l

JO

• ! I ! I I I • • •

J"~JO' • • ,.,

, ,

,

\ , ,

, , ,

,

• • , 'N

,

j1 C , , E " , • , , i= t- t- •

S J" ~

- 45 -

,

, • II ~'!, I • "

, , , •

-tfJ:~/ -, , • • • ;~t, II 'i. .

'I I

~" flW ~

l- , • • • • • ,

Dn9, II""" UNIV,~\lTY Of (AllfORNIA

•

• •

• • • • i ,

I

• •

,

• • , , • • •

• -• •• -

• • -, • -•

• -• -

• , " •

111 11-241 31- 34 SIGNAL CORPS

31. FREXn1EIiCI SEPARATION OF 3U.TIONS. - In general. the trequ"nc1

~eparation ot stations wUl depend upon th" t ollowing v..rUble racton :

a . TranSlllitter power.

b. Receiver !electi~ty .

•• - Frequency ami 32. Mffi LINtS. - Power lin .. &rtI a eource ot interterence.

Locete the receiving and tran .... i t ting atationa &II t a r ... pouibl.e trca

pol'ier linn , npechll y high teneioo linn, &I they ma,y induce high

33. TERRAIN . - Where pouible, locate the truck )(- 18- ( * ) on the

higheet ground avaUable . Surrounding hilla _y act ae a shield to the

propagation ot radio wavea and aeverel¥ reduce the operating r ange.

Unle .. concealllent is neceeaary. it 11 not adviuble to locate the

anter .. a among t reee Dr buildil4a .

34. UST OF CUiIl'ONfNr PARTS .

Q\i.antity

1

Carried in Truck TraUer

C""'J>O!lent K-l8-(* ) )(_l9= (e )

Antenna. Equ1p111ent (tranelll1tter ) includes:

1 Antenna, ver tical (9 sectional wast Sections 1IS-65 to )(5-13 inHualve

1 GUJ' GT- 31

1 In_tilator DI- 102 (spare tor .cast section KS-65 )

1 lU.et Brace 1a'-40

1 Inaulatcr :0;-103 (spare tor ..... t brace !lP- 40)

1 lIIast Baae 1IP-39

S Sta\

Jllantity

1

, , ,

, , , , ,

12

RADIO SETS SCR- l97 e, C, 0 , E, and F.

Carr i ed in

nt 11-241 J4

Truck trailer Component K-13- (. ) K-19- (. )

2 Gr OWld Rod. GP- 28

2- Hanmera RiI-l

Battery BA- ):); 4 in use, 4 spanc (for talephona EE-8)

Box 5X-19 Cfo r apare receiver t\lbea}

Control Unit R!.I-7- (. }, include.:

1 Cover, d\lat

1 Telephone FE 8 C. ) (l en "..nl includae:

1 Handset T5-9-(.)

Cord CD-201; ) in \lU , 1 apar. (for key J- 44)

Cord CD-)66 (Conneets r adio reeeiver BC-)42- (*) to control unit RY-7- C· )}

Cord CD-)70 (to eonnaet reeeinru and. e

TV ll-24l 34

Qua!ltitz

12

12

12

, , 6

6

16

10

,

, , , , , ,

SIGNAl. CC»lPS

CalTlad in Truck Traller

Component I-1S- (*) 1-19=(*)

Fusa, 3.2 _ p. , 250 volt, BII~ &dJl JUg. Co., Fusatron 11\.032, Redio Tran8lll1tt.ers OC-325- B, BC- 325-C

Fuse, 4 .5 ~p. , 250 Yo1t, BIInman IJ!g. Co. , Fu~etron 14045, Radio Transadttar OC-325-D

Fuee 35 &lIIp ., 250 Yolt , J8fteraon Union Typo, 1300-035, power connection bo:o:

12

12

F\1ea 60 amp., 250 volt, Jefferson Union 12 Typo, Ilo. 38Q-

Quant.i\:.:

,

1

4

, 1

2

,

1

IWHO SETS SCR-l97 S, C, 0, E, and 1' .

C&ITied in Truek Tr&ller

COrtIponent. K- l8-( *) K-19- (*)

Ilicrophone T- 28-(* ); J 111 use , (Cor Radio Seta SCR- l97-C, SCR- l97-D, SCR- l97- E, SCR-l97-P')

Wicr ophooe'l:- )8-(* ) ; (Cor Radio Set.. SCR-l97-C, SCR-197-0, SCR- l97- E, SCR-l97- F)

lIicrophone T-28-(* ); J in use, 1 "Pare (Cor Radio Set. SCR- l97- E)

Wount.ing ",-178 (snubber Cor ",CdYe!)

Transmit.ter power equipooent., includu:

1 Generator GN- 42- (* }

1 Reguletor, volug' (Cor QN-42-(* »

1 4ut.o tran lCormer

1 Pow.r COIlt.rol PlUlel 1'll-92- (* )

1 Cebl. , power (15 ce.t. )

1 Sooit.oh, power *ntranc*

Power UU t. 1'E-75- (* ) inclOOn:

1 Power cord

Radio rec.i .... r OC - )42- (* ), 1IIeludu:

) Fun !'tI- 2J.- (* ): 2 in use, 1 epare

1 Fuse ru- 27

2 Lamp 1»-2']

1 itount.ing FT- 162

1 Rect.ifier 1U.- 20

1 COTer , dust.

1 PUle, eart.ridge, 12 amp. , Bulaun IU'g . Co., Funt.r oo It.l2

1 pun, 3. 2 amp., 250 wat.t., 8.ls_ IU'g . Co., f'u&etrllll I!J,,032

1 Puse, IItg .

2 amp., 250 volt. , 9Js"...., Co. , I"Usetron /1402

- 49 -

1

2

o

1

o

o

1

0.., II""" UNIV,~\lTY Of (AllfORNIA

2

1

2

, o

2

,

o

TI4 ll- 24l l4

QumUty

2

2

• SIQUl. CORPS

CCll:porumt

1 Puu, lo b .cp .• 2~ 'O'o1t. Bus_ )ttg . Co •• l'Use tf'On .¢.016

1 Fun , 4.5 .... p •• 2SO volt, a".~ 1011'S. Co ., F\lset.ron 14

Qu!ntity

6

6

, 6

6

6

)

6

6

15

)

, 6

• ,

ItADIO sns SCR- I97 e, C, D. ~ , and. F. nI 11-24l

" CcnoP!'lent

C ... ried in t~ck Traile r K-l8- (~ ) K-19-(~ )

2 Spotlight , r ot8ubh

1 Tool IQll.ipunt

Tubes 'IT-lob-A, 10 in uu . 8 spar. i trananUtt .. r )

Tub .. VT-b', bin uu, b .1' .... (r"celv.,r )

o

Tub .. vr-66 , ) ill liS", ) spar. ( ret.lv..r ) 0 (tran ... 1tter)

TIIb .. '11-76, 2 in use , 4 'pare ) (tcntrol unit )

Tub .. VT-al; ) in use , 5 lpare (RM-7 - (. ) ) and monito r receive r )

'l'IIb", VT- 8); 2 in ule , 10 span (t",.nl-.titte"l' )

!\Ibes VT-S6; 12 in usc, 12 'psr s. (ncelvlt' )

6

o

Tube. vr-87, ) in use, ) Il*'"e ("I'lclivld 0

Tube. VT-S!J, ) in use. ) apare (reca tver ) 0

Tubi, 'IT-9O: 1 in use, 2 aparl (lIOI'Ii-t.o"l' receiver )

Tube. 'IT-9S , 2 in ule , ~ .pal'S (tontrol unit !1K-7- ( )}

o

6

Tubn VT-97: ) in use, J I~r. ( ... e eiver ) 0

Tube. VT-IOO ; , in use. 10 apere ( t ran...u tt" .. )

Tub .. 'ff_10l , 1 ill IIU, 2 spare (tran..utt.er )

, Tubn 'fI'-lO) , 1 in US" , 2 lpal'S (lIOI'I ltor ' 0

rec"lver )

Tubel VT- I06; 2 in 1111 , 10 spare (trl"mtter )

Tub .. VT- 117. J in use , b spIre (monitor r ecelTer )

Tube. , canmer el&l. type 91 ), I in USfI , 2 .1' .... ( tranS

TAt U - 241 34

QuAntity

, ,

,5JCI{~ L CCIU'S

Canponent

Tube ... V'I'-167 (6KS) ; 1 in lise, 2 sparOl (monitor r eceiver)

Tubes, cDm)erci&.l tY'P'" bJ6CT; 1 in use , 2 ap&TOl (monito r rOlCeiver )

ClLI'rled in Truck Trailer K-ll!-(

RADIO SETS SCR-l97 B, C, D, E, and F. TW 11-241

J4

Re !'~rence

'" "" "'" "', "" ""

'" '" '" it33

", C'

C2

C5

c6

C7

C6

en

C12

Cl)

C14

ClS

!fame or ?&rt

Resiator

Ruhtor

Ruisto r

Resiat or

Resis t or

Resistor

Resisto r

Resistor

Resist or

Resistor

Resist or

Resistor

Resistor

Cepaci t or

Capacit or

Capllcitor

Capacitor

Capacitor

Cspae1tor

Capacitor

Capacitor

Capacitor

Capacitor

Capacit or

Capacitor

Capacitor

Deacr iption

100,0XI aIDa , l/J watt

250,000 otwa, l/3 watt

250,000 otwa , l/3 watt

250, 000 ohms, l/3 waU

500 olDa, 1 watt

s.oo,OOO otwa, l/3 watt

5,000 olms, 1 watt

Ir.-f gain control

15,000 ohms, l~ watta

50,000 ollma, 1/3 watt

13,000 ohm., 11 w.tt. 10,000 ohms, 3 watts

150 OM S, l/3 watt

10,000 ohms , l! watts

400 ....r, lUin tWling

27 !!JlI!, band spread tWling

.05 mmt, 200 volts

25 ....r, ce ramiI.'

5 lQIIIf, cer &:A1c

.002 .. f, r.dca

.02 mf. 400 yalta

.02 mf , 1000 yolts

.05 mf, 200 volts

.05 mf, 200 volta

.02 ct, 400 volts

2 nmf, twisted pair

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" Dn9. II"""

UNIV,~\lTY Of (AllfORNIA

'N 11-241 )4

Reterence

," '16

01' 0'"

0" 02)

024

'" '" 02'

02' C»

OJ>

'" OJ)

0)4

OJ>

OJ/>

OJ?

0J9

040

5.;2

5':14

SIGNAL CORPS

HII/Oe ot Part

Capa.citor

capacitor

Capa.citor

Capacitor

Capacitor

Capacitor

Capaci tor

Capa.citor

Capacitor

Cap"citor

Capacitor

Ca;>&citor

Capacitor

Capa.citor

Capacitor

capa.eitor

Ca"..citor

Capacitor

Capacitor

capacitor

Capacitor

SWitch

::'it ch

Switch

Ducription

50 amt , mica

.02 mI, 400 volta

10 m!, 25 volta electrolytic

.01 mt, 400 volta

.01 mt, 800 volta

.02 mI, 600 volte

.02 ar, 400 volta

.01 ar, 400 volts

100 omf, adca

. 01 mI, 900 volta

):l mt, loW volts electrol,ytic

10 mI, 400 volts elec t rolytic

.1 lilt, 2C() volta

.05 m! , 200 volta

10 mt, 450 volta ,lectrolyt.ic

100 !lVJl.!, cerownic

105 om!, ce ramic

2, 400 and 450 1IIlf, padder

1,400 amt, p.,J.der

.01.)2..r, adca

.0005 mI , mic ..

.05 mt , 2(X) volta

AC CtI-ort, Tone Control

Send_Receive

tiro en-otC

.l.NL(x'-oft

AVC (x'-Ott

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0.., II""" UNIV,~\lTY Of (AllfORNIA

RADIO SET SCR- 197 S, C, V, !; , &nd F.

R~ferenc~ Name of Part Description

TIl 11-2U 35-36

Sooitch "5" met e r Qll r - f gain control

36. illiPUCEJ.Blli P.I.RTS , OTf/iJI 1U.JOR COIolPONEJtrs. - For the tllblu

of .-.phceable parts of the other major component s of Radio Se t SCtl:-

197- (. ), consult the technical ,""""ala listed in. p.1ragra~h 9.

- SS -

Dn9. II""" UNIV,~\lTY Of (AllfORNIA

TIl. 11-241

" SIGNAL CORPS APPOOII I

l/," x 2-1/2". The t.T&Uer with it.. prill. monr, "hen traveling at

noru.l. apeed, e.an be It.op~ .. tilfactorilr with t.he Il.ct.ric brake

controller operated, by t.he driver of UI. priM ·lOOnr.

!. A. cont.roller, the action of wnich il I1 .. Uar to that of

a rlleOltat., 18 at.tached. to the It. .. r!.n& POIt. of t.he prilae .IIlOver. When

tile controller 1a applied, the clll'rmt. !rca t.he batt.ry of t.he prl..l

IIOV

RADIO SETS SCR- l97 B, C, D, E, and r. I'll: 11_241

37

trailer. Thia awitch 1& connected with the prime moYer by a nCet,.

chain . It such a breAk "houid occur, thereby dieconnecting the batter,"

oC the prime mover, the .. Cety ehin po.a.ll" the lower oC the B~ety

roteh. Thh lnOyement oC the .. erety switch lever e..uae .. A connection

to be made with the ~hot-shot~ battery located 1n t he t railer. 'the

curr ent from this battery ene rgize. the Al ect r-Jll&grlet . oC the braku

which u t t he brAku in the "",nner ducribec1in "ub-PAragraph!. . (Note:

'to disengage the .arety switch and release the brake. oC the trailer,

return the safety "witeh lever to it .. nol'll\ll.l OFF posit ion.)

•• - For best relulta , the brake blinds JI'llSt be roWld. Brake band" ~out oC roWlll ~ will "AUSe unaathCaet ory act i on. IC the le.ad1n&

end oC the brAke hend 18 bent a-.&1 Cron: the brake center, the brake

will be atrong or ~.;rabby" . !'!'hen I:ent in toward. the cent er , the brake

wUl be weak. ,'/hen repacing a brake band or bacldne plate, do not

"prin& the band out CArther than necea"ArYi th18 ,."111 prevent bending

C. When brakea .re ne., . ea r in or burnilh by towing the

trailu and applying the brakes on t'ull. CI"OIII operating apeeda to t'ull.

atopi unt il they provide eathCactory strat.:;ht atope . Take Care to

allow time Cor cooling bet_en applicstionl so ttmt the band lining

will not beeome carboni'.ed due to exce~s1ve heating oC br~ku . In CIU

one or I!ICre br llkes should be st,·onger th&n t he others, dhco"""ct the

stronger br akee .. hile the ""aker ones are >10m in to the point .me",

they all come tozether •

.s.. tor an ordinary stop , AdYanee the h&ndle of the """troller gra dua.ll,y in order to obtain a lieht brak1n6 application and to pre-

vent sliding the wheel" . Uae heavy brakine appli"at1o"-, onlJ for

IIIIIOr;::eney etops .

h . A 10&d "ontrol 1s pr ovided which permits the driver oC the

- ,7 -

, Dn9. II""" UNIV,~\lTY Of (AllfORNIA

TIl 11-241 J7 SIGNAl. CORPS

pr l.J:le ",over to regulate the braking: powe r and p r e Y\lllt ekiddin!l. The

condition of the road must be given ~on8i :l eration boofor" t he load con-

trol h set. ror Slippery roads , "et the load cOflt r ol on LIGHT .

i . Durin:; co. ... bined operationa of the prUle I:IOver and t railer

OIl the hiSh"ay, the driver muet be ~aut1ous and not pull on t ile brake

lev~r t oo hard , u this.,.,. caua .. t h .. brakes t o lock. He should adapt

hlJuself t o the ,"ethod of applying the brakes gradually in short s t ope ,

first pulHn!; the lever down , releuing a little and t hen pull ing it

down furthe r, unt il full application is afCe~ted. Thle gives ,,",oathe r

stops and lotlgflr br:lke lining " e(l.1" . At nO t 1n>e should t he p r l.J:le loover

bra"u be applied before the trail er brakes . The dr iver should adapt

h:l.m. .. elt al"AYS to apply t r ailer brakes bef or e appl ying pr ine luQve r

brakes . Tll1s bee",""" natural '11t h experience and this sequen~e Should

ai"aye be f ollo" ed . Should t he pr ime lIlover skid at any tl.J:le , apply

tr;o.iler brak .. alo"ly and bot h unite will straighten out by t hia action .

.1. Sudden rel ellses of accel er ation SOl>.etiJroes he"" a tendency

to cause t he t railer to p ay. Appl1c.~tion of the trlliler braku . al

r emedy this .... &ying. Pas t c, .. ",er cial expe r ience )u.a proV1lI1 t hat,

should the t railer brake CaU at. any t we, the lenn al t rouble i , very

aeldor.. in the brake i t selt, but eit he r in s conn .. ctlon or a bad " ire

anywhere from t he cont roller th.rugl! the entire system to the br ake

drums . Check t hes .. connections and . ires . Hh ~xtre"", care before

>lheels are di .... oWlted tor furtller checking .

k . 'ine dr i ver ",u" t ",ake sure before start1n1l: that the emer-

&ency break- nwll.J' meohani ... h on the Of'F pOsition, and aho that the r ip

cord conneoting the breakaway " itll the prLne .,over ha"gs free , so that

in cue of _er gency this rip cord .,ay ope r ate prol"'rly. The "lIot-

shot ·, \>;ottery " hieh is used to operllte til .. " .. e r gency break- a"ay cont.r ol

should be used only for that pW'pO .. e and for no ot her purpose " hat so-

- 58 -

OoJII II""" UNIV,~\lTY Of (AlifORN IA

I

RADIO SETS SCR-l97 S, C, 0, !':, and f. '" ll-'41 )7- )8

ever. If, by accident the b~ak_aMaY switch is len in the ON poaition

for any length of t~e, check thia battery for ita operati~ condition,

or ~place it at once .

:/. HOOK-UP OF TRllCK .I.HD TRAILm. _!. Before dropping the lunette

eye into the pintle hook on the priMe MOVer, ra18e the trailer ao that

1t ie slightly higher in the front than ner. Th13 should be Ju.ot

enough aO thst when the weight of the t r aile r i e applied to the prize

rIOOver , throU,th the pintle hook , the depMluion of the prLlle IDOver spr i ngs

will lavel off the trailer. For but re.ulte, tow when the trailer 1s

as near level a s pou ible .

•• '\'he height of the lunette eye 18 adjustable . '!'he.e pod_ -tions are obtained by t s kill6 out the two large bolts in the lunette eye,

rabing Or lowering it to the deaired poait1on, &rid replacing and Ught-

enin,e; the two bolta . The height of the l unette eye may be varied to

a ulat in paCing it in the pintle book by opentine the bar CrOu handl,

at tlla top of tile yoke .cnw. This II&OOle i. locked in pl.ca aOO ia

adju.o ted by the thumb aCrew at the very top of the yoke aCrew.

£. Atter the lunette eye Ie dropped into the pintle hook , hook

up the trailer safety chaiM securely to the primfo IIIOver. Take e&re

t ll&t there 13 enough slack i n the chain. to allow free turning of the

trAiler. When the hook_up 1a COlll!)l"ted, next. scn'" the lAnding wheel

up to ita III!l>dIrrunI position , turning the bottom oC the yoke Cork up ao

that the lug on the qu.dr.nt castins eng""ea the dot in the top oC the

wheel yoke. Thh holds the wheel. rigged in ita maxim"", lip position,

when t .... veling. A!ter the wheel. i. screwed all the .... y up, pull out

the lockins pin fro", the upper res r hole of the qu"drant .nd adjust

the whole wheel ass""obly until the 10 .... 1' front quadrant hole match.,

the hal" 1n the quadrant casting; insert the locking pin throu,;;:h theae

holes., making sure the slot 1n the end of the locking pill en:;a,;;: .. the

59 -

Dn9. II""" UNIV,~\lTY Of (AlifORN IA

TK 11-241 J&-J9 SIGNAL C(JU>S

lrlrI loeldng pin, on t.lle opposiUl aida of t.he quadrant. CHEC K Tim

PINTLE HOOt: TO BE SIJRE IT IS SECURELY lOCKED. 110 ... connect tile JUn'lpe r

cord to tile trailer and tile pr1ae OIOnr. Take cue tllat Ule contact

plintl of tile J ... per cable are free fl'OCl grease, dirt, and other

foreign particlea, whicll :nay cause tro\lble in tile connection. A alot 1"

provided in the fixture on tile trailer in "Mcll the Jumper cable can fU.

in only OIIe podtioo. ,u ... a,ya check tile atop, clearance, and tall l1ghte

for pr oper operation befo", p\lttJ.n.l the units in motion. RtIIOOve the

front and rear door etepa and pbce them in their realMctiva storage

positiona in the two entrance doors. Check all ili S\lpport jacks to be

sure they are in the \II' poSition and extended into the brackets ao that

they are held securely in pos i tion. It 18 recOlO:llendad that tile trailer

not be hauled dtll the l~ " lIeels down. Wilen the traller 18 in a

reatin .. position, it ie adv1eable to Ilee the chocl< bl oc:ks to bloc:k the

"heels and steady the trailer. TheBe:nay be \leed in front or in back

of the "heels, Ifhichever loeaUQn 1, necessary. Take care that traller

tire, and landin,o; .. heel tires are Checked at reg.uar intervale to be

sura that they Uti al"lI.,)'e kept at the pr oper pressure.

J. TRAIlER 1(-19- ( .. ). -

!. Exhaust fan. _ 011 regularly every six montlla -.nth good

gr.w.s of lubricating 011 such aa }-in-l or equal. (CAUTION, Do not

apply too lIIuch oil. )

i. Heater fana. - No oiling necessary. Encased-type design,

permanently oil&

RADIO SETS SCR-l97 B, C, D, E, and F.

lubrleating oU Ilich al J-in-l. or eqUAl..

tv 1l.-24l.

" f . lAnding "heel\!. - Good grldl tibroul whe.l. gnolee IVI I7

5,000 ..nn. Appl)- alter 1"IIII01'&J. ot hIIb elp. TikI care th.&t appl1el_

tlon i . a&dl direet to blaringl . For pressure fittingl, ul. good poldl

of IIUonaJ. cup UN ...

,s. Sprinal. - E1'&ry l,CXlO ..nee or oftenlr ellan and _ab

Ipring extlrior I=f..,ee with I good grade of p_trating oU.

h. Sprin« Ih&ckl ... - E'noI7 1,000 ..uu app1.r gre .... with

grid. ot .. &lonal cup grlu. and being IUNI tb.at grea .. reaehll aU

pu-tl of the Ih&c:kl. . EYII7 5,000 aU .. clean and repack wh_l blaringl

gnoue.

(A. G. 062.11(5-3O-I.2 ). )

By order of the Seerew:r ot War ,

OFFICIAL,

J. A. ULIO, )(ajor Gen.ral,

The Adjut.ant Ceneral .

OIS'l'RIWTIOH,

c. C. MARSIW.L, Chief of Stalf.

D 1,17 (J); B 1 (12); 11 1 (10); 9n 1 (I.); I Bn II (10) ; IC 11 (I.) .

(For n:planatlon ot l,..bol.I, I .. FII: 21-6.)

II. S. OOVERNMENT PRINTING O FFICE :1"2

- 61 -

Dn9. II""" UNIV,~\lTY Of (AllfORNIA

x-105x-106x-107x-108x-109x-110x-111x-112x-113x-114x-115x-116x-117x-118x-119x-120x-121x-122x-123x-124x-125x-126x-127x-128x-129x-130x-131x-132x-133x-134x-135x-136x-137x-138x-139x-140x-141x-142x-143x-144x-145x-146x-147x-148x-149x-150x-151x-152x-153x-154x-155x-156x-157x-158x-159x-160x-161x-162x-163x-164x-165x-166x-167