RCA AR-88, Instructions Manual

Page 1: ...1 I OD l 88 INS TRUC IONS IIII 110 M cturing Com y me It IVICE O H III M UO CO pO AT ON 0 A ...

Page 2: ...PrInted In U S A GENERAL PURPOSE COMMUNICAliONS RECEIVER MODEL AR 88 INSTRUCTIONS Manufadured by RCA ManuFacturing C ompany Inc Camden N J U S A AN ReA SERVICE 18 25921 2 ...

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Page 4: ...4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 ILLUSTRATIONS FrDnt View of AR 88 Receiver 2 Loudspeaker 2 Diagram of Rear of Chassis 6 Diagram of Front Panel 8 Diagram of Top of Chassis 11 AR 88 Chassis 16 Top View of Chassis 17 Top View of Chassis Covers Removed 17 Bottom View of Chassis 18 R FUnit 19 Schematic Diagram 20 Selectivity Cur...

Page 5: ...mplifier 1 RCA 6K6GT Beat Frequency Oscillator ItllCA 6 5 Rectifier 1 RCA Y3GT V oltage Regulator 1 RCA VR 50 Output Impedance 2 5 ohms and 600 ohms Mechanical SpeciAcations Overall Dimensions 1934 inches wide x 11 inches high x 1934 inches deep Receivers with Serial Nos below oo ooo do not have the 600 ohm output TABLE 1 PERFORMANCE DATA Approximate Values Taken on SampJe Receiver Sensitivity Ant...

Page 6: ...ghout the AR SS Receiver the best material obtainable is used for each particular purpose and all workmanship is of the best The following instructions should be studied before the installation or operation of this equipment is at tempted in order that optimum performance may be obtained 11 EQUIPMENT The equipment furnished consists of the Receiver Chassis Assembly including control panel and tube...

Page 7: ...O PLUG 2 S MS tt l J U 0 T T 6 11 S7 Tlo R R e80E 6000HMS TRANSWTTER DIVERSITY ANT GND TERM BOARD POWER CORD RELAY Figure 3 Diagram of Rear of Chassu the proper tuning of this circuit with any antenna system Por the standard broadcast band conventional an tenna and ground connections should be used The antenna terminal board is provided with three terminals see Pigures 3 and 6 two of which may be ...

Page 8: ...ent ages down to any modulation whatsoever determined by the setting of the noise Iimiter control A noise limiter switch in conjunction with AVC provides for use of the noise limiter on CWor on modulated reception when interference is preserit Output Tube The RCA 6K6GT output tube is resistance coupled from the A P amplifier an RCA 6S 7 tube and operates into an output transformer which has taps f...

Page 9: ...ance at the antenna terminals is designed to match a 200 ohm transmis sion line except on the broadcast band where a low frequency primary is used For general use it is recommended that a straight wire antenna between 25 and mfeet long be used Speaker Terminals for connection of a loud speaker are indicated in Figures 3 and 6 The output transformer is designed to match a speaker having 2 25 ohms i...

Page 10: ...t part of the side band frequencies are amplified very much more than they are when the carrier is tuned to exact resonance This is characteristic and normal for receivers with this degree of selectivity which are provided with AVC Care should be taken to tune the receiver for a maxi mum meter indication The background noise and ad jacent channel interference will thus be materially reduced Noise ...

Page 11: ...ly on certain positions after long periods of inoperation Usually rotating the switch back and forth several times will clean the contacts and operation will become normal A bad range switch contact is likely to cause a change in the sensitivity of the receiver or the frequency of a received signal as the switch is moved back and forth slightly in a certain fre quency band position A further check...

Page 12: ...cal HI to Terminal C on last I P Transformer L47 L48 Vertical LO to chassis Dummy Antenna Insert in series with generator output 0 01 mfd Connection of Generator Output Lead See chart below Connection of Generator Ground Lead To chassis Position of Power Transmit Receive Switch Position 3 Rec Mod PO i Uon of R P Gain Control Pully clockwise l1 oeition of Selectivity Switch Position 2 Position of N...

Page 13: ...clockwise Position of Antenna Trimmer See chart below Position of Power Transmit Receive Switch Position 3 Rec Mod Position of Range Switch See chart below Position of R P Gain Control Fully clockwise Position of Audio Gain Control Fully clockwise Position of Noise Limiter and AVC Switch Position 4 AVC Position of Selectivity Switch Position 2 LOCATION OF PARTS AND ALIGNMENT ADJUSTMENTS ON CHASSIS...

Page 14: ...s such as transformers okes ter and by pass capacitors etc are mounted with sctews and nuts rather than with rivets All wir Ftg othe r than that involving high frequency circuits inade up in the form of a laced cable so that no e leads are left floating which might tause damage 9 t change capacity to various portions of the circuit The tuning condenser is mounted so as to be rigid Wi respect to th...

Page 15: ... C17 C18 COO C23 28 C2 C25 27 32 41 43 45 64 66 68 C2I6 29 42 65 67 69 C30 CSl C36 58 C38 39 60 62 SO 81 DESCRIPTION CAPACITORS Capacitor 4 700 mmfd Capacitor antenna trim mer Capacitor variable as sembly 8 sections Capacitor 220 mmfd Capacitor 18 mmfd Capacitor SS mmfd Capacitor 22 mmfd Capacitor 66 mmfd Capacitor 15 mmfd Capacitor air trimmer Capacitor 525 mmfd Capacitor 13 mmfd Capacitor 1 550 ...

Page 16: ...2 K 867970 340 K 251402 2 K 25l400 2 K 251402 3 Symbol Designations R52 R54 R5 5 tR56 SI to 16 S17 to 2 S21 22 S 3 24 S25 Tl f T2 T3 T4 T5 6 T7 8 T9 T10 TBl TB2 f TB3 Xl 2 3 7 8 11 X4 12 X5 6 10 13 14 X9 Receivers with Serial Nos below 003000 use R56 Resistor K 90497 4 5 ohms DESCRIPTION Resistor Tone Control Resistor 2 700 ohms watt Resistor 6 800 ohms watt Resistor 1 000 ohms 4 watts SWITCHES Ra...

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Page 22: ... z J C 1 E o Z l t t 14 12 10 8 8 4 2 0 2 4 KC Of f Aa8QN HC 21 8 8 10 12 14 Figure 12 Selectivity Curves I 9 8 ...

Page 23: ...W mm m I I I I I 11 I 8 III toll I IQ 11 I t o J N zz 00 j wO 00 0 0 tU 0 z zz 0 u t OU at III 8 u UJ 00 UI J J filII WID I I f Ill a It a J ou Figure 13 Fidelity Curves ...

Page 24: ...w ill r It R u I 0 UJ rn o o I t1 Lnd LnO S L LYM cS R G o o o fit 0 0 o z r Figure 14 AVC Curtle ...

Page 25: ...adapting the Gen eral Purpose Communication Receiver Model AR 88 to 6 volt battery operation Four rubber feet are pro vided for resting the unit on a table or shelf If pre ferred these feet may be removed to expose threaded studs by which the unit may be bolted permanently in position NOTE The power supply unit must be mounted with the vibrator in an appToxima ely vertical position Direct current ...

Page 26: ...ower line cord supplied with the receiver is completely out 0 the circuit when the vibrator power supply is used this cord should be wound up and placed inside 01 the receiver case in the _ pace between the chassis and the case wall OPERATION The switch On the power cable must be used for turn ing the receiver on and off the power switch on the receiver being automatically cut out of the circuit w...

Page 27: ... v 63817 TBl Capacitor 25 mfd 40 v 63818 Wl Vibrator 63821 TSl Choke A line 63820 VSl Choke B line 63811 Description Plug 8 prong power cable Resistor 5 000 ohms Included in Cable Wl Switch voltage tap Transformer power Terminal Strip ellternal Cable Socket Socket power tube octal _ vibrator 4 pin CS 1O D PC5 4S0Y 05 I D J I I I I I I I 1 1 1 _J WI Stock No 35383 37122 37119 63810 63819 63822 3125...