• CENERCAL PURPOSE COMMUNICATIONS RECEIVER MODEL CR-91 INSTRUCTIONS RCA VICTOR DIVISION OF RADIO <'ORPORATIOH OF AMERICA Camden. N. J.. U. S. A. , -• ~ :::, !! GENERAL PURPOSE COMMUNICATIONS RECEIVER MODEL CR-91 TECHNICAL SUMMARY Electricel Characteristics Frequency Range-tou! 6 bands .. .... .. ..... .... .. ..... ... ... .... .. • . 7l to :;0,500 kc Band 1 .... ........... .... · .... · ·· ...• · ·· ···• · ·.·•· · · · · ·· · ·• · · · ·· · ·· ·· 73 to 205 KC Band 2 ... .. .... .. ..~ .. .... • .. ... .. .. .. .. .. .. .• . .... • . .. ... 195 to 55 0 kc Band 3 . ... .. .. " .. , ...• , .. .. •. ....• ' ..• • . • . .. •.. • . • . • ... • . ' . ' . .... 1,480 to 4,400 kc Band 4 . .. .................. ...... .......... ... • . • .. • . • . .... 4,250 to 12,150 kc Band S ... .. .... .. ... ...... ..... .. .... .. .. .. , ·· ... ·· .. • .. .. .. .... ... 11 ,900 t o 19,500 kc Band 6 .. ... ... .... .. .. .... .. .. .. .. .... ... ... .. • . ... • .. .. .. .... 19,000 to :iO,500 kc Maximum Undistoned Output- approximate-2.5 watts Output Impedance-2.5 ohms and 600 ohms. Power Supply Requiremenb Line Rating .. .. .. .. .. .. .. .. .. 100· r17, 117·13 5,135·165 , 190·230,200·260 volts, 50/ 60 cycles .or &tterie,s . .... ... .... .... ..... ... .. ... .. 6 volt "A" battery and 250 [0 l OO volt "B" battery. or Vibrator Power Supply Unit . ... .... .. .. .. .. MI·8319. Power Consum ption- l 00 watts. Tube Complement R·P and I-F A mplifiers . .. .. .. .. •.. .... ........ •. ..... .... .. .. 5 RCA·6SG7 1st Detector (con ve rter) ...... .• . • . ..•.. • . .. • .. • • . • . ... • . ... .... .. 1 RCA-6SA7 Oscillator . ... " .. , . .. , •. , . • . .. ,. , .. .. .• . .• . , . • . • • . .. ...• . , 1 RCA.6J5 2nd Detector· . .. .. .. .. .. •. .. .. •..•. •. .• .•.. .. ..... • ....• . .. • . ·.. 1 RCA·6H6 N Olse:· L'I mltu. ..... ...•• . ••• • . • • • • • • • · .. • • •. • . · •• • . ···· • . •. .• · • ··. 1 RCA·6H6 A·p Amplifier ..... ... , . .. .. • . •. • ... • . • , . , •. • . • • . • . •. • . • • ..• .. • . .. 1 RCA ·6S]7 Power Amplifier . .. .. .. .. .. .. .. .•.. • .... .• ... • .. ..• .. , ... .. 1 RCA6V6GT IG Beat Frequency Oscillator . ... .. •.. • . .. • . , ... ..• ... •.... .. .. • . .... 1 RCA·6J5 Rectiner .......... ..... .. •. , • . , ' •.. • . , .. •.. .•• ...... , ... •.. ••. , . 1 RCA·5 Y3GT/ G Voltage Regulator .... .. .. .. • . • . .. .. .. .. , . .. .... .. .... .. .... ... .. 1 RCA-VR·150 MeCMnicel Spe.cific:ations Overall Dimensions .... .. .. ..... .. .... .. .... 19l,4 inches wide x 11 inches high x 191/ .. inches deep TABLE I - PERFORMANCE DATA (Approximate Values--Taken on Sample Receiver) Sensitivity Antenna Input in Antenna Input in Band in M ic rovolts M icrovolts for :20 DB M icrovolts for 20 DB Image No. M e: gacycJes for 0.5 waU Signal·N oir.e Ratio Signal· Noire Ratio Ratio 1 .077 .5 1.8 10.0 .1 40 .5 1.8 10.0 G reate: r than .190 .5 1.8 10.0 1,000,000 2 .205 .6 1.0 7.0 ,375 1.0 8.0 G reater than •• 1,000,000 .500 •• 1.5 10.0 3 • I.• .5 1.5 11.0 1,000,000 3.0 .7 1.3 10.0 4.0 .5 1.3 10. 0 25,000 , 4.5 •• 2.0 12.0 500,000 11. 0 •• 1.5 10.0 9,000 5 12.4 1.0 2.0 n.o 15,000 19.0 .5 2.0 12.0 3,500 . 6 20.0 2.0 2.0 11.0 3,500 30.0 1.0 2.0 13 ,0 600 • . I-F rejectIOn at 1600 kc IS 800.000 . 4 • VI INST ALLA TION Power Supply . T he power supply ci rcuit is in­ For gl,;~ neral use it is recnmmcnut:d that a straight tegral with tht: receiver. Determine line voltage and \""1[(' antenna hetween 25 an d 50 fec t long he used fr"yuency and check with the rattng of the receiver. for hands:' to 6 inLlu .s ive~ and a WIfe of 200 fCt~ t or The po\ver transforrncr prilnary T1lity he connected more for hand :; 1 and 2. for anyone of five volt;lge ranges by means of Cl L1. p Speaker - Terminals for connection of a loud­ switch. This switch is l o,· ~t e d in the rear apron of the speaker are indicated in Figures '2 and 6. The output r ecei\'e r~ and the voltage for \vhich it is set may he transformer is designed to match a speaker having read directly un the .switch. 7.5 ohms ilnpedance. For Battery or other Supply Operation - For con­ nections sec Sl' hc. malic Diagram figure 11. It is only Headphone., A jack is proviueu on the left of neccss,lry to remove the plug from th(~ socket on the the front panel for plugging in a pair of headphones. rc;.tr of the n.:: -:.,;' ivcr. ,mu connect the batteries to the T here a re l\VLl positions of the plug. proper tl~rrninid. s as indicilted hy thl~ schematic dia ~ gr'\ n1. A. hattcry cahle terminating in an o::tal male 1. Half way in -,--for rc:ct':ptio ll on hnth speah::r plug IS Il ccc5sary for thi5 purpose. A vlbr;ltur po\vcr and phones. supply MI-S:; I 9 i. available which will opera te the 2. F\llIy in ior phone reception only. receiver uircctly from a 6 vD lt storage hattery. For inforl11,ltiOl1 011 this 110\vcr unit SI;'~C Section XI. See "CIRCUIT ARRANGEMENT" "Output Tubes Inspect the chas.,.;s before applying power Tube. " tu see that all tuhes arc firm ly seated in their respec· MO\lnting _.- The instrument may be placeu on a tive sockets. tahle or mounted on a ral.".k. For rack mouncing loosen Antenna .. T he input Impedance at the antenna the p;tncl mounting scr(~\\'s anJ remove the panel and terminals is desi.gned to match a 200 ohm transml s" chassis cn mpletc from the cabinet. The: panel is sion. line or a straigllt wire capaLity t~:pc antenna. cquippeJ. with slilll c.larcl sl()ts for rack mounting. VII OPERATION Pigurc 3 illustrates the dials anJ control knohs. TUNING VERNIER TONE NOISE LIMITER TUNING LOCK ANT. BFO TRIINS. 3 4 4 MAN.N.L. A.V.C. N.L. I I MAN ., A.V. OFF " .... BFO ~-'. , , c . ( ) (, - 5 , ) ~~ - POWER TRANS. ~ RANGE R.F.GAIN AoUDIO GAoIN SELECTIVITY NOISE LIMITER RECEIVE PHONES AND AV.C. R-879E Figure 3 Diagram of Fron' Pallel 8 I , I • ,L2 525 TRANSMITTER , L4 RELAY OUT OIVERSIT'f ~~, ANTENNA PH-5!5697 Figure 6-CR-91 Cl!au is 18 • , KC. ) " " "" 6 "'7 ,.... .~ ' ,;ru..... &ltf~" ..... '- .~H' 'H __ H'",- ' ....,. D. ,- -- ·) T~""'''' , " ....... v .~ -__--_-_ OIv ~Il& I "'" n< "<f IlMs '. 2. __ urtAKAI._~ ~OO.f\. -':0. FigllY(, 11-SrlulJlatic D iagra /ll 10,000 1,000 .... .."z -... ..:r a: LOO o Z.. ..:r ....- , KC OFF RESONANCE • 12-Se/ectivity ,.-, zz 00 1.':+-- 11(1)-- 00 D.1l , -t\! 0"· Z zz 0-- u .. :IX Ut oCJ Ittt a.III ••~~ • » ~ ,..1- u -- >- ~~ u ~I- 00 11111/ .J..l 111111 «nil) I I ~N 1LIU1 » • •• a: It ou~:::J o Cl) .... C\I o ID 11 -• ..• -• -• -• o "o F igure 13 Fidelity C llYVCS 26 • XI VIBRATOR POWER SUPPLY UNIT MI-8319 (6-VOLT STORAGE-BATIERY OPERATION) TECHNICAL SUMMARY Electrical Characteristics- Output .... , . .. , ... .... , ....... .. .. , .... .. .. .. ...... ... .. ............... .. ~OO volts, 90 rna, B;lttcry \lollil~e .......... , ................... .... ... .. .. .. ... ... .. .... ........ 6 to 8 volts T otal current drain (operating l\R·8S rc ~ ci\.'cr) .... ... .. .. ... ... .... ............ ....... 12 amp c.rc5 Fuse Rating _, . .. ............. .... .. ....... ... .... .. .... ...... ..•.... , .. , . 15 amperes Tube Complement. .. 1 RCA-OZ4 Mechanical Specifications,- Dimenslons···-- H eight . , . , . inches Witlth . , . .. 5 inches 1 Deptll .. .... ... .. .. ... .... .... .. .. .......... ...... .. .. • . .. .. ............. .. .... 5 -/;- inches Weight (net) . ... ........ .. .... .. ... ...... ....................... ... ............... 7 pounds EQUIPMENT The MI,831 9 identifie, the equipment furnished I-Power Cable. approximately 8 fect long, equipped with the power supply Ullit and consists o f the fo11 o\'l.' " \vith pOV"tc-r EWltch, fuse holder and fuse, t erminaLs for ing items: connecting to the vibrator power supply unlt. and I--Vihrator Power Supply unit, complete wIth vi­ l ermi n at in~ to a plug for conncctmg to lhe. a sso ~iatt::d brator and RC .A ·OZ4 rectifier tube. receI• ver. DESCRIPTION The MI,g 319 vibrator power supply unit is pri· NOTE-The power supply unit must he m ounted marily designed inr the purpose at" adaptin g the Gen­ with th~ vibrator in an appr(lximately vertical posi- • eral Purpose CommUIlI catlOn Receiver (Model tlOn. AR-gS ) to 6-volt hatter), operation Four rubhef feet Dire" ,'urrcnt at high potcnti;d is obtainetl by "rc rrov,oetl for resting the unit on a tahle or shelf. If m eans. o f ,! n 0l1~s yn c hr0T1{) lb vibrator used in ;,: o nj u n c~ tion \\11th ,": step-up transt':"lrme:-. R ecti fication i ~ ob­ preferred, these feet may be removed to expose talOed hv the use of an RC.A-OZ4 rC'ctificr tube, This threaded studs b), which the Untt may he bolted pef' power U:11l- has bee.n d es HmfJ anu testeD to operate manently ill posItion. un der a v..!1 dl' \"'l.rie lY 0 1 chm ati.;: con ditions. INST ALLAnON Connecting the Power Cable to the Vibrator Power t h e two sclf-tapPlng s..:: rcws in the (' ()vc r. /\hllut four Supply Unit -: ·1:1 order to connect the nnwer cable to f':'2 t irom thl.: enJ ( ) f lhe Lahk t u the ( W ( I lar ge which • th ~ vibrator power supply u n It, first r ~movc th e: tcr­ ha.tter~' ('l q:'!.s ~r(' iltta..:hcd. it ~r o u r of fou r \l,,' i n~:;. each minal boanJ cover from the power Unit hy removing aODul {()llr lll(:hc~ long and eqUIpped wlth ~~ spaJ::: terminal, extends from the cable. These leads should Switch Position Battery Voltage be connected to the power unit terminal board-the 4 6.0 to 6.5 volts brown lead to the termlnal marked "A-HOT," the 3 6.5 to 7.0 volts yellow lead to "B-" and the red lead to "B+." Re· " place the terminal board cover with the three leads 2 7.0 to -1. ) volts . extending from the open end of the cover, connecting I -, . J to 8.5 volts the black lead under one of the screws which hold the Connecting the Power Cable to the Storage Bat· cover. tery-Turn the power switch in :he power cable tu Mounting the Switch-Fasten the switch to the the "OFF" position.