mcr1 manual

8/8/2019 MCR1 Manual

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m R Y DIAGRAM W COIL PACKSa

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YCRl RECEIVER nlJD ACCESSORIES.

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The Set w i l l work w i th sh o r t ae r i a l and no ea r t h , a s shown i n th e w alk in gp o s i t i o n , b u t . of c o ur s e, f o r . r e a l l y good r e s u l t s a nd f o r r e c e i v i n g f a r d i s t a n ts t a t io n s , you sh ou ld :-

1 ) E r e ct t h e a e r i s l a s h ig h a s p o s s i b l e , u s in g t h e ba l ce l it e c a r d a san in su la to r i f ' n ecessa ry. The ae r i a l , p lu g s in to so cice t #A * .2 ) Use th e 10f t. of w i re p ro v id ed t o mike an ea r t h co n n ec t io n w i th

t h e c r o c o d i l e c l i ? , o r a l t e r n a t i v e l y . us e t h i s a s a c ou n t er p oi s ee a rt h . P l u g e a r t h i n t o S O C K & 'Ea.

3 : S e l e c t a c o i l u n i t t o c o v er t h e f r e qu e n cy of t h e s t a t i o n whichyou wish t o r ece iv e , and pu sh t h i s o n t o th e end of th e r ece iv e r .

4 ) P lug th e t e l ep h on e l ea d s in to th e so ck e t s aa rk ed .PP.5' .&en r ea dy t o r e c e i v e , p lu g t h e o v e r l e a d i n t o t h e b a t t e r y , o rn ~ i n s n i t , which e v e r you a r e u s in g.

TiXIEiG I N THE STATIONS.1: T urn th e S en s iz iv i ty co n t ro l f u l l y c lockw ise.2 ) ~ d j u s t h e t u i n g c o n t r o l u n t i l a ny s t a t i o n s onewhere n e a r t h efrequency requ ired i s tuned in .s ) A d ju s t t h e a e r i a l t ri mm er f o r t h e l o u d e s t r e c e p ti o n .4 ' n d j ~ s t h e r e a c t i o n c o n t r o l t o t h e _ ; os i t io n e i t h e r j u s t b e fo re

o r ju s t a f t e r t h e p o in t o f o s c i l l a t io n . acco rd ing t o wh ethe r R.T.o r C.W. s i g n a l s a r e t o be r ec ei ve d.

6) R e fe r t o t h e c a l i S r a t i o n s c a l e on t h e c o i l u n i t , a nd move t het u n i n g c o n t r ol t o t h e s e t t i n g g i ve n f o r t h e d e s i r e d f r eq ue nc y.If t h e s t a t i o n i s no t h e ar d a t on ce , s w i tc h t o a nd f r o ar ou ndt h e s e t t i n g g ive n.

6 ) If n e c e ss a r y r e - a d j u s t s e n s i t i v i t y t o g e t c o mf o rt a bl e 70 1 uw .

I*ORTIINT POINTS.a ) away8 remove t h e p lu g f ro m t h e b a t t e r j o r ?ewer pack when th er e c e i v e r i s not being used. I f you don ' t do t h i s , you w i l l expend

your ba t t er y o r waste power.b ) d w a y s l e a v e one c o i l p ac k on t h e r e c e i v e r , i n o r d e r t o p r o t e c tt h e p i n c o n ta c t s .c ) '&en chang ing c o i l u r . i t s , ca re shou ld be taken t o keep the u n i tss t r a i g h t , and i n l i n e w i th t h e r e c e i v e r , i n o r d e r t o a v o i d be cd in ga nd s t r a i n i n g t h e p i ns .d ) I t i s d e s i r a b l e , a l th ou g h n ot e s s e n t i a l , t h a t t h e b a t t e r y s ho ul d

be discon tinu ed when changing c o i l uni ts.e ) About 50 h ou rs o p era t io n can be ex p ec ted fro m th e b a t t e r j .f ) I f t h e r eac t io n co n t ro l h as to b e tu rn ed a lmos t c loc !cwise b e fo re

t h e s e t o s c i l l a t e s , a s i n d i c a t e d b y t h e "lop and h i s s a , i t i san in d i c at i on t ha t t he b a t t e ~ j s becoming run down.

Thi s power p ack may be us ed, when c o r r e c t l y a dj u s te d , o n e i t h e r r i j C o r D/Cmains , a t any vo l tag e between 97 and 140 o r 190 and 250.

P roceed a s f o l low s t -A s c e r t a i n t h e t y p e of c u r r e n t , h / C or D /C , a n d t h e v o l t a g e b y reference t oan e lec t r i c h o u se mete r .For D/'C mains, use t he S ele cto r Screw i n one of th e top row of soci te ts ,

marued a In p u t V o l t s D / C a , a n d f o r A/C m ai ns s cr ew t h e s o c k e t i n t h e a p p r o p r i a t e


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socke t o f t h e bot tom row, marked "n p t i ro l t s J ~ / C a r axin;: ci-ru TO screw thesocke t r igh t home.

P l u g i n t h e pow er l e a d t o a s u i t ab l e w i n s o u t le t .If you have an y d o u l ~ t s t o .whether t h e m i n s are ir[C o r i&'C, proceed 6 s

f ollowa: -a ! S e t t h e v o l t a ~ e e l e c t o r s cr ew i n t o ;:le i)/C r a g e at Zle c o r r - c tvol t t .qe.b ) If t h e r e c e i v e r f a i l s t o o p e r a te , r ev er se ';he i s i n s p l u ~ n i t ssocket . If' now t h e r e c e i v e r g i v e s r e s u l t s , t h e n t i le iaains a r e .;,C.c \ I f s t t r t l o n s car. be r e c e iv e d f ~ l i i l t l y r. 2 i t i i e r - :os i t i a r . o f t h em vi ns ? l u g , t h e n t h e r n ~ i n s& r e .I/C. Ir. t i ~ i s a se - 3witc.i ~f:'

the power - remove t h e s o c ~ e t e l e c t o r screw, anci > l u g i x i n t ot h e i n pu t v o l t s ../C r a g e , and agclin r e v c r c e ti:a 1 n ~ 5 i . s .LUG.d ' If' when on A/C troublesome rnliins iurn i s i ~ e ~ r d ,o;ue iuprovtjnectmay be e f i e c t e d b y r e v e r s i n g t he mrii~s l u ~ .

,9r%XGE 1.nws . XTZS1CO 3CGO150 200 0200 1500250 1250d o 1000350 8554CC 75C450 666.500 c r ~ l560 545.6CO 5G 0650 46270'2 42975G 4COeoo 37 5850 3 53900 3339 0 316

1CCO 3001 l C O 2731200 2501.320 2311400 2141500 2C01600 188

~ h i r d r o g r a m eNorth RegionalS c o t t i s h i i e g i o n a lXelsh RegionalHome ServiceWest RegionalMidland RegionalLight Frogramma

- akpproximate se t t i n ; 85h p pr o xi m at e s e t t i n g 9 8n p p r o x i m a z e s e t t i n g 1 0 5h p p ro x i ma t e s e t t l n g 11 0a p p r o x i m a t e s e t t i n g 120x p p r o x i m t e s e t t i n g 127Approximate se t t in g 129Approximate se t t i ng 135


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4- FlLblmEnr+

SHIELD

C W O B ~ SBOVE CUSSIS AKD ON ThG BOARD.

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TH.EO~,"~ICALD I A G W OF ?HZ lGCEIVZR.


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RESISTORS

VClA Variable TrimmerC2A 5OPFC2B 5aPP

250, mooamsPot. Sen250,dOOatunnPot.React.470, omohms

3.9 ehms3.3M o h

C bD .1 UP 2 5 ~ R12A 68,OOC)ohms

C ~ A .a1 UP 250. L21A Aerial c oi l (Iron core)a01 uf 550 T non Inductive W A )

LlBC9A .003 UP mica

IF Transformer-7w Kc/s.Lja n " Reaction'PC28) Ganged Tuning Condenservc %I T lA Outpt Trans.PhonesP1A Parer Input Plug(4pin)VALVES.

IA 1T4 Local os ci ll at or 1.4 V1C 2nd Dot. & L.F. AmplifierV2d 1R5 U x e r 1.4 V1D Output PentodeV1 1T4 I F Amp 1.4


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SHMSG L h Y U U T OF TOP CfUiSSIS.

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r i g h t home, a s onl y when it i s i n t h i s p o si ti on w i l l i t s h or t c i r c u i t t h e a x *switohea, which, i n turn , eho r t-c ir cui t RS/P. This res is to r must be sho r t-c i rc ui te d f o r proper working on A.C.FAULT FINDING OX THE WR1.

In common wlth a l l o the r rec eiv ers , t he most de l i c a t e pa r t s of t h i s s e t a r ei t s ' v a lve s . Care must be taken no t to .drop th e r ece ive r , a s t h i s w i l l probablyf r hc t u r e t he f i l a ne n t s . ~ i l s o , hou ld i t be necessa ry t o remove th e valv es from 3t h e i r s oc ke t s , t he n t he g r e a t e s t c a r e s hou ld be t a ke n t o s ee t h a t t he y a r e notrocked, a s th i s bends th e pins and of ten cracks the glass . n l l t h a t i s r e qu ir edt o remove thes e valves , i s one s t ra i gh t upward pu ll.I f your r equi r e t o t e s t the f i l aments of the vu lves , the bes t way i s , no t t oremove th e va lves, bu t t o t e s t ac ross p in 1 and 3, of th e mains plug. Th is shouldgive 5 c losed c i r cu i t r ead ing . Of course, i f you get an open ci rc u it reciding here,then don' t presume th ht a l l the valve f i lam ents ar e burned out. The bes t plan theni s to t ake of f the ou te r cas ing of th e r ece ive r hnd te s t f o r f i lament cont inu i tyacross the contac t s 1 6nd 7 of the valve base , thus avoiding takin g the valve a t .Should i t be found tha t th e f i lament r ead ing i s in order , e.g. tha t thef l l s m e n t s a r e O.Z. and ye t the se t w i l l n o t pl ay , t he n a s c e r f a in f i r s t of a l l

If ?he trouble i s i n the povrer supply or the recei ver . If you have both batt eryand power pack, and the se t w i l l not work from ei t he r , but according to the bes tof your knowledge, bo th ba tt er y and power pack a r e O.X., then i t c a n f b i r l ys a f e l y be presumed t h a t t he f a u l t i s i n t he r e c ei ver .

The beat method of f a u l t f ind ing then i s to v o l tage t r ace a round the va lvesock ets; th er e should, of course, be H.T. volt age on a l l anodes and screens (don' tfo r ge t your meter loads the c i r cu i t )

I f a l l these appear i n order , then , w i th a s igna l generator t r y to ge t an I.F.signal through from anode VW. If you can, then th e t rouble i s e i t h e r i n t h e c o i lpack (poss ib ly imper fec t connec t ions ) o r the 1T4 va lve i s no t osc i l l a t in g , o r theccrnponents associ~ tedw it h t h e o s c i l l a t o r c i r c u i t a r e a t f a u l t , o r e i t h e r V1A o rV2h ar e a t fa ul t , or t he components as soci a ted with V W a re a t f au l t.If you can 't ge t an I.F. s ig na i through, then worx gradual ly to mr ds t heoutput stage, changing down to an L.F. s igna l a f t e r t he second de tec tor .The fhult w i l l alweys be j u s t beh ind t he f i r s t po i n t where you s t a r t t o ge ts i gna l s , 0.g. if you ge t a s i ,w l a t the gr id of t he ou tput va lve, bu t no t a t thegr id of th e second de tec tor , then the f a u l t must l i e i n the second de tec to r o r i t s

associated r e s i s t o r s o r condenser.FAULT FINDING ON THE POWXR PACK.

GEXERkL. absen ce of ii.T. and LOT. v o l t s w i l l usual ly mean that e i ther C%/Por Ca/'P have developed an inte rna l shor t , a fa u l t which i s not uncommon w i t he l ec t r o l y t ic condensers , e spec i a l ly I f a vo l tage i n excess of t he i r r a ted vo l tageha s bcm acc identa l ly been appl ied , and th i s can happen q ui te e as i l y w ith mul t i -vo l t -ge se t s , e.g. i f the p lug were se t a t 107 vo l t s and the se t acc i dent a l lyconnected to , s ay 250 vo l t s , then , i n a l l p robabi l i ty the h igh vo l tage wouldbu r a ou t t he e l e c t r o l y t i c s . I t might, a t th e same time, burn out th e valves.

Bear i n mind when t e s t i n g vo lta ge s of th e power pack, t ha t t he f i l a m en tvol thge w i l l not be exa ctl y 7.5, un les s your meter i s exac t ly the same res is t ancea s t he 5 valves in se r i es ; t heref ore , don ' t be a larmed if your vol t age reads th i gil .

- Don't fo rg et thwt C4jP may develop a sh or t- ci rc ui t with or without a goodreason, but you can read i ly check t h i s by te s t in g between pins 1 and 2 of t he i.power pack output socket. This, whil e not ahowing In fi n it y , should show a highr e s i s ~ a n c e d o n ' t f o r g e t t o m ai nt ai n ~ o l a r i t y ) n f a c t , you s ho ul d be a b l e t o s eet h e charging of t h i s condenser from your own meter batt ery . (If hum develop s i nthe se t , then te s t t h i s condenser ' s capac i ty by watch ing it charge through yourown ineter). If no charging t6k es pla ce, the n t h i s condenser has developed an openc . i r cu i t and th i s w i l l cause hm. If t h e s e t hums on A.C. a n improvement Canusual ly be ef fec ted by revers i ng the mains plug.

I


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00 NOT CHflNGE T PUHILST UNIT 41s CONNECTED I

0 TD MRJNS 9 I IIO'iJI!JG Hff# FLUG k i E C T S pS?iITCEIi


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CQIPomNT LAYOUT a' OWER PACK.


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. . .- . . , . .. . .. 8 ' . - . ',,>. . .' '. . , , ' ... . I _ I , . I . .. . . .. . . . . : . :* . - ,,. , . - ~ - ' .. . . . . . , ::: ; ; # y . , . : : ; ; . : ! :',:,. ' . ' - , , . . . . . .. ,P.TP!.ACIIIG THE DRY BATTZRY. . 1 7 ' ; - . .. ,I . . . * _ . ,. . . . . .. - . . I ' . . . . . . . . . . "- . < _, . . . . - , . < : '. ,, -. I : -, .: 1 .;: , .. \ . I , . . _ .' , ' . . . . l C , . . . .. . . . .d t t he t ima of is h i n j t h i s booklet, : $ ~ ~ l r ~ ~ ~ q e a n t ~ t ~QS t he ~ o ' ~ r e ~ t ~ . ~ l z e , .and tyPe of batteries' are available..^^^ 1 s beli eved, :however: . :t ha t h ere: wy:b o . ' .

a short age; the ref ore , come .notep- and . 'sketches s bo cn g bow ,ord in aryba t te r ie s . . c a n , ,. ' . . . . . . . .: _ . . . . .. , . . ..... - .. . . . ) . , . .. . . . . . . . . : : . . .be. ueed, may be helpful. ' . . . . ? J,, ,:..: :...I : -.: . . . ... . . . .'. .. . . . . - . ....... ... . . . .\ ..;. '. ,' .; ., < .::.., ^, K.< . . . . . . . ,, , .;, . , ," , , '. . . . . . . ._ _ . . L > - a < , . -


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N o t e s o n t h e U ;R .C . 1 . and P owe r P a c k .The c i r c u i t o f t h e L I o R o C o l o IS d r a w n w i t h a s h o r t n av e c o i l a s s e a b l yp l u g g e d - i n . T he c i r c u i t o f t h e c o i l s r a n g es 2,3, a n d 4 , cre t h e s a m ee x c e p t far t h e s i z e of the p a d d i n g . c o n d e n s e r , s e e d i a g ra m . Range 1,L e r i b l c i r c u i t i s d i f f e r e n t , s e e ' a i a g r a m i n b ot to m l e f t h an d c o r n e r . You

will n o t i c e t h e t there i s no t u n i n g i n , h e s i g n a l f r e q u e n c y b u t a f i l t e rd e s ig n e d t o p t s s , s i g n a l o f f r e q u e n c i e s below t h o n i g h e s t i n t h e b r o a d c a s tb a n d s , and t o s u p p r e s s s i g n a l s a bove t h i s v a l ue . I n a d d i t i o n tcis a v o i d st h e d i f f i c u l t i e s o f g a ng in g * . . . . , .

.The MoRoColo work s f r o a 90 v o l t s HoTo The c u r r e n t i i i t h s e n s i t i v i t y~ n de a c t i o n c o n t r o l a t m in in un i s 5 I&. F u l l s e n s i t i v i t y a n d S e t i no s c i l l a t i o n 7.2 MA. F i l a m e n t c u r r e n t 53 U t 7.5 v o l t s .As the IA.RoC. l . i s b u i l t t o work f r o m ~ ~ ' B C / D CPowerP e c k , t h e c i r cu i ?must not come i n d i r e c t c o n t a c t v i i t h E a r t h . T h i s i s a v o i d e d b y e a r t h i n gt h e c i r c u i t . t h r o u g h a .1 m f d ,c o n d en s e r t o t h e c a s e , a n d t h e c a s e of C h o s a i sg oe s d i r e c t t o e a r t h .I f you c o n s t r u c t y o u r own power p ac k w i t h a n ? l I f i e r , t h e b i e s t o t h e

a m p l i f i e r v a l v e l h 5 s h o u l d b e 4 . 5 v o l t s , . I t i s easier t o u se a 4.5 v o l tb z t t e r y t h a n t a p i n t o t h e f i l a m e n t c i r c u i t . The p o s i t i v e of t h i s b a t t e r yi s c o n n e c t e d t o t h e f i l a m e n t o f t h e 1A5 v a l v e . You w i l l o n l y r e q u i r e o nee x t r a l e a d t o c o u p le t h e p on er p a c k t o t h e s e t , as t h e r e t u r n c on es wl tht h e b ~ t t e r y e a d s .

A s t h e o u tp u t f r o n t h e s e t i s t o s u l t 1 2 0 o b s He a d p h o n e s , t h e b e s tvrtiy t o c o u p le t h e e m p l i f i e r t o t h e s e t , i s t h ro u g h t h e .1 n f d c o n d e n s e rshown i n d o t t e d l i n e s a $ t h e h eed ph on e o u t p u t v a l v e . T h e re will now be2 c or l d en se rs i n t h e g r i d c i r c u i t o f t n e l A 5 Valve. One i n t h e s e t a n d- t h e o t k r i n t h e a m p l i f l e r o T h i s i s - t o - p m e n t y o u r e c e i v i n g a s ho ok .-- -f ro m t h e p o s e r s u p p l y . The c o u p l i n g l e a d b et we en s e t a n d a q l i f i e r , i f~t i s s c r e e n e d , s h o u l d b e c o v e re d f o r t h e sam e r e a s o n .

T h e c a s e o f e i t h e r pow er p ac k i s n o t c o up le d t o t h e c i r c u i t a t a n yp o i n t , s o i t i s i m p o r t a n t t o w a tc h t h e i n s u l a t i o n b e tw e e n t h e p a r t s a n dv i ir in g t o t h e c & s e .h k i t o f p a r t s c a n be s u p ? l i e d i n c l u d i n g m e t a l c a s e 9" x 4 x 3-2"

u 2 1 i i e d t o t ~ k e a l v e h o l d e r , s p e a k e r and c o n t r o l s . , P r i c e 2 5 . 1 9 . 6.i3hT'I'XEtY CO;JXSCTICNS FOR b1.R .C .lo

B a t t e r y Plug C heck l e a d s C o l o u r o f l e e d s\ b e f o r e using. R3D LZi.9 H.T. 4\ BLACK LEAD HT-LT-YELL03 LEAD L eTL t t e r y l e a d\ iL l - ~ c k f?. LT."

- Hed H.T. f Got tom....

Looking a tt h e p i n sw i t h t h e two p i n sf u r t h e s t w a r t a tt h e b o t t o m .

Y ! J I K I NG : E v e r Hebdy AoD.24 h t t e r y w i l l ' blow t h e v a l v e s i f p l ug ge d i nw i t h o u t t il ic e r in g t h e b e t t e r y c o n n e c t i o n s . i s y o t t e r b e t t e r y7~it .hthe shme f i t t i n g s s h o u ld be e x a m in e d t o s e e i f s u i t a b l eb e f o r e p l u g g i n g in.


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i CLYDESDALE SUPPLY.CO LTDTHE RADIOMAN'S SHOP

2 BRIDGE 51, LASGOW, C.5.BRANCfliS IN SCOTLAND, NOU,THOF CNGLAND AND NORTHERN IRELAND.


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mcr1 manual

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