Страница 1: ...GENERAL PURPOSE COMMUNICATIONS RECEIVER MODEL AR 88 LF INSTRUCTIONS Manufactured by RCA Victor Company Limited Montreal Canada ...
Страница 2: ...Figure 1 General Purpose Communication Receiver Front View Figure 2 General Purpose Communications Receiver Loudspeaker 121 ...
Страница 3: ...nications Receiver Front View 2 2 CC C6 44 46 Loudspeaker 2 3 46 46 CC LC Rear Apron 7 4 QC 44 CC C6 Alignment Layout 12 5 Vibrator Power Supply Unit MI 2215 Schematic Diagram 16 6 General Purpose Communications Receiver Rear View 23 7 44 6 46 4 Top View 23 8 Top View Covers Removed 25 9 6 Bottom View Covers Removed 27 10 44 R F Unit 29 11 4 ScheMade Diagram 31 12 CC 44 Selectivity Characteristics...
Страница 4: ...e No 1 Radiation Less than 40 micro microwatts of power radiated as dissipated in resistance con nected from Antenna input terminal to ground Value of resistance is such as to cause maximum power to be radiated see Section 3 below Output Power Maximum undistorted 2 5 Watts when loudspeaker used When low im pedance headphones are used maximum output fed to the phones is 100 milliwatts approximate l...
Страница 5: ...Type 6SG7 valves are used in all stages and a Type 6H6 valve is used for AVC and second detector The first I F transformer has its primary and secondary tuned and is coupled through the crystal filter link The second and third I F transformers are composed of four tuned cir cuits each These circuits are varied in coupling by the selectivity switch The fourth I F Trans former has two tuned circuits...
Страница 6: ...able terminating in an octal male plug is neces sary for this purpose If the Vibrator Power Unit MI 22216 is used remove the plug from the socket on the rear of the receiver and plug in the cable from the Vi brator Power Unit Connect the 6 volts D C input to the power unit with heavy low resist ance leads See Section 7 for more detailed information concerning the Power Unit 4 3 Valves Inspect the ...
Страница 7: ...tand by use 2 I F band width for normal modulated reception 3 Crystal Filter in for CW telegraph or sharp modulated signal reception 4 Crystal Filter in for sharper CW tele graph reception 5 Crystal Filter in for sharpest CW tele graph reception 5 7 Noise Limiter AVC Switch This is a four position switch and starting from the fully counterclockwise position these are 1 AVC and NL out Manual gain o...
Страница 8: ...ing signal at different angles the good reception with mini mum fading results Refer to Figure 3 Connect together the ter minals marked Diversity of the receivers and equip each receiver with a separate antenna Tune each receiver to the same station as ex plained in Section 5 12 above 6 MAINTENANCE 6 1 This receiver should maintain its correct fac tory adjustments over a reasonably long period of ...
Страница 9: ...d the other end has a hook for engaging in the hole in the end of the plungers After adjustment the lock nut should be securely tightened 6 4 2 I F Alignment The intermediate fre quency is 735 kc The only satisfactory method of I F alignment is by means of a sweep oscillator and cathode ray oscillo graph The I F circuits must be aligned at exactly 735 kc and the frequency of the sweep oscillator c...
Страница 10: ...to 30 megacycles and an output volt meter are required It is desirable to con nect a speaker across the output terminals The output voltmeter should then be con nected across the speaker voice coil The output impedance is 2 5 ohms Remove the cover from over the R F unit by loosening the four knurled screws and lifting off Refer to Figures 3 and 4 Make connections as per Table IV a Align the R F ci...
Страница 11: ...1 110 Z 57 8 9 4 2 79 KC C 00 KC SO 6 94 0 0 Lift 242 F 61 _____C 22 49 BANG 4000 KC S C 32 6 fig 1W 90 SO 0 KC Z 9 3 r L 3 2 BOTTOM L 24 It L 26 2 0 OFT Arc 2 ro s_ TRANS r2N0 FN TRANS 63 97 Z S9 4 9 NANO gea KC 0 C 6B 44 6 940 80 000 KC 42 BANG 805 KC NO SE ST 0S 7 7 9 cs er wo 9 400 KC L 29 1 469 Z A7 72 A S7 A F N C9 C 64 43 8946e 4 2SO KC 0 ______ 0 C S9 4 694 0 43 BRNO 1600 re 5 r 7 r e 4 vs...
Страница 12: ... ohms 13 and 14 until end frequencies are as indicated 4 300 200 ohms L 54 Low end osc 12 100 200 ohms C 25 High end osc 19 and 20 until end frequencies are as indicated 11 900 200 ohms Max output C 39 C 62 1st 2nd R F 4 400 200 ohms Untouched L 8 L 18 L 28 Ant 1st and 22 and 23 until circuits remain in alignment over the band 2nd R F 25 12 000 200 ohms 26 19 400 200 ohms 27 25 and 26 until end fr...
Страница 13: ...aft extension by loosening set screw in coupling with same wrench as used above for knobs h Remove support bracket from fly wheel tuning shaft i Remove main dial vernier dial and flywheel by loosening set screws with same wrench as used for knobs j Disconnect the eight leads which con nect the R F unit to the main base These leads are as follows i Two on the antenna terminal board blue and black i...
Страница 14: ...he terminal board cover from the power unit by removing the two self tapping screws in the cover About four feet from the end of the cable to which the two large battery clips are at tached a group of four wires each about four inches long and equipped with a spade terminal extends from the cable These leads should be connected to the power unit terminal board the brown lead to the terminal marked...
Страница 15: ...even to the vibrator itself may result under these conditions b Never disconnect any leads on the power cable unless the power switch is turned off Never tighten any terminal screws unless the power is definitely off Should it become necessary to tighten any or all of the screws on the vibrator power unit terminal board always first remove the battery clips from the battery THIS is extremely impor...
Страница 16: ...0538 46 1 10C 8112 C 31 Condenser 39 mmfd 5 500V Temp Coeff 00047 mmf mmf C 90580 223 1 10C 8098 C 32 Condenser Air Trimmer Same as C 27 C 33 Condenser Same as C 1 C 34 Condenser Same as C 4 C 35 Condenser 10 370 mmfd C 36 Condenser 1500 mmfd 20 600V mica 98041 1 1 10C 8100 C 37 Condenser Air Trimmer Same as C 16 C 38 Condenser Air Trimmer Same as C 16 C 39 Condenser Air Trimmer Same as C 16 C 40 ...
Страница 17: ... 111 Condenser 2700 mmfd 10 500V mica 102899 508 1 10C 8103 C 112 Condenser 25 mfd 400V See C 99 C 113 Condenser 25 mfd 400V See C 99 C 114 Condenser Same as C 73 included in T 9 C 115 Condenser 180 mmfd 5 500V mica included in T 9 86034 513 C 116 Condenser Same as C 111 C 117 Condenser Same as C 1 C 118 Condenser Same as C i C 119 Condenser 003 mfd 10 1000V oil filled 251248 3 1 10C 8117 C 121 Co...
Страница 18: ...L 49 Coil Filter Choke 901433 501 1 10C 8154 L 50 Coil Filter Choke Same as L 49 L 51 Coil Oscillator 73 205 KC 253674 503 10C 8155 L 52 Coil Oscillator 195 550 KC 253674 504 10C 8156 L 53 Coil Oscillator 1480 4400 KC 95520 506 10C 8157 L 54 Coil Oscillator 4250 12150 KC 253674 505 10C 8158 L 55 Coil Oscillator 11900 19500 KC 253671 503 10C 8159 L 56 Coil Oscillator 19000 30500 KC 253671 504 10C 8...
Страница 19: ... 2nd R F Ccts S 7 S 8 on same wafer S 8 Switch Range Sw Wafer 2nd R F Ccts See S 7 S 9 Switch Range Sw Wafer 1st R F Ccts S 9 10 on same wafer S 10 Switch Range Sw Wafer 1st R F Ccts See S 9 S 11 Switch Range Sw Wafer 1st R F Ccts S 11 12 on same wafer S 12 Switch Range Sw Wafer 1st R F Ccts See S 11 S 13 Switch Range Sw Wafer Antenna Ccts S 13 S 14 on same wafer S 14 Switch Range Sw Wafer Antenna...
Страница 20: ...950 1 Coupling 99630 1 Caps Shield Can 99840 1 Dial Assembly 98947 503 10A 8187 Fuse Holder 844027 2 5C 1304 Knob Large 712336 503 10A 8180 MISCELLANEOUS Knob Medium Knob Small 712336 505 712336 507 10A 8181 10A 8182 Lamp Pilot 1 4 Amp 6V 61114 15 12 5L 777 Screw Knurled Thumb 252664 1 Screw Thumb 99610 9 Screw Set 8 32 for small knob 844365 12 Screw Set 8 32 for medium knob 844365 13 Screw Set 10...
Страница 21: ...Figure 6 General Purpose Communications Receiver Rear View Figure 7 General Purpose Communications Receiver Top View 23 ...
Страница 22: ...7 LE 427 L 28 C66 C 30 6567 C86 v7 7 G43 7 0 G44 907 TOM 1 46 C 04 C 0 6 567 6367 C38 Z50 C75 C80 4 1 39 c 3 I 5Y367 L 6 Tf G OA C26 6V667 C 56 6 7 V L 62 T T 7 L 37 TOP 442 0P L38 Borra v L4 8 orro i i G 40 L45 L 9o c f C 94 C 00 423 L24 C59 C70 L3 C 8 CG4 C77 C32 L5 L56 C 6 C49 C27 C53 65 v 9 7 655 R52 C50 6 15 V3 L54 C26 73 z 33 TOP 4 507 C 72 c35 15 _ 65 17 0 050 17 1 3 C 60 Figure 8 General P...
Страница 23: ... R44 R43 C 7 R37 R45 R3G ie39 C R 50 C78 C84 C50 5P4ee voc acx ts 7 e F cerri7 36 C76 C C 9 545 04ta TO Co 8 WAVE 7R6v e23 C 75 C 8 cRY 574L 5 9 F eO T sea RaeR y5 4 c99 Cite 5C5 C 3 e 55 256 N C7 C 95 e es R 5 C c R46 G 2 c oa X 7 R 3e C 0 3C C 0 5 C 0 7 Figure 9 General Purpose Communications Receiver Bottom View Covers Removed 271 ...
Страница 24: ...C 1 16 C 3 9 C C 34 Z 30 z e3 sei e42 C z C 26 C 3 3 L 3 7 x a C fo 9 L 25 eZ 26 6 0 C 32 C 62 C c 2 9ez 6 0 L S C 63 C 27 Z 27 ez 28 C 7 C 32 G 5 6 X C 6 5 75e 5 6 S 3 5 4 C 22 S 1 C 64 cv 9 C A9 6 28 0 20 e C 25 Z 33 e 4 C 14 C 3 C 3 7 C 27 e 4 c e e 9 z se 6 23 X 3 A C es C 24 Z 5 7 C 57 Figure 10 General Purpose Communications Receiver R F Unit i 29 ...
Страница 25: ...00 4 8 0 5 7 6 AND RANGE 1_73 203 KC 2___195 550 KC 3_ _ _148 4 4 MC 4_ __425 1215MC 3___119 19 5 MC 6___190 305MC 522 REAR 521 FRONT II CIII 1 2 R 1 1 5EG AUDIO GAIN 2 991 1131 OLOW TUSE C lr A 2700 CAPACITORS CI II 33 4Z 51 52 54 63 83 118 121 122 MAY BE Cl MFD P7 86091 511 EXCEPT THAT FOR 0118 122 A SINGLE 01 MFD SHOULD BE USED CII7 MAY BE 006 MFD PT 86091 509 CIII 116 119 MAY BE 003 MFD P7 860...
Страница 26: ...1 Iiii KN F MHIII Lmoillimn 1111 61MBLEMEIBM 11111 E M 1111111 11111115411M 0 g snagaummg UNNMMW NINgi 7 6 5 4 8 2 0 000 I Effallidill k saire OffilakE _E Ig E a ERMININTOMIIIIII 11111111111ININNIUMEZINEMINSINIF 18 ilitesMWEFR giLgaggEIMIUMEINNIMAIS Na l f f iNg gP MIEB 9 B C MM ffMiW Minna MON 111 111111 EMMEMINI MENIMEIMIN 11Z 1 k4MBEIMIZM ESES7 E M 7 IIIIIIIIIIM111111111111111111 ELEEE g 247 6 ...
Страница 27: ...llilliIIIIIIIIN r 1 1 F I i l_i J 1 1 iii_ T 1 4 4 lupprw r hid 11 1 was is 1 mo h ofir Nrior 1 UM IFF N ERIng libiald pqrdiNg gibalitilm ommoppron iiiiddiriiiirE in 11 siminshi INtr qg _ _ 1 _ _ 1 I 2 11 EMI mop v in 11111191111141061 11111 rilIMPIE lialinilly_ r1F _1_ _ 1 i L t 111111111 1_ 1I 1 1 14 i 1 4ji r4 i 1 t MI in 1 1 1 t i 1111 11111111111RITI 1 lig implumumm EMU lilt Hill A 101111 1 I...
Страница 28: ... 06 04 0e Os M CR 0 VOLTS INPUT Figure 1 4 General Purpose Communications Receiver Overload A V C Characteristics 351 Os 0 4 0 1 0 VCRLO AND V C A 8 8 ve 2 A A v e ...
