National NC-2-40D Instruction Manual Download Page 6 | Manualshive

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Summary of Contents for NC-2-40D

Page 1: ...for s t 1 nccQi b nrw tsen y n51 x1 tommvmtznian A high performance receiver of advanced design for the 490 to 30000 kilocycle range...

Page 2: ...Accurate Calibration Actual Single Dial Control Temperature Compensation Automatic Voltage Stabilization Series Valve Noise Limiter New Flexible Crystal Filter 115 and 230 Volt 50 60 Cycle Operation...

Page 3: ...her wise be caused by humidity effects Vari able condenser insulators tube sockets etc are of Isolantite The chassis of the NC 2 40D is cadmium plated to provide positive grounds and better conductivi...

Page 4: ...st reception The curves show that any degree of selectivity between that of full single signal operation and wide band broadcast reception is available the ratio between the two being almost forty to...

Page 5: ...the table model NC 2 40D Receiver is of the permanent magnet field type having a nomi nal diameter of 10 inches A coupling transformer mounted on the loud speaker chassis matches the voice coil to the...

Page 6: ...mewhat reduced F I X I BSW P 2 F 2 X 2 loud speaker output a6 volt heater supply storage battery should be connected to terminals 1 and 2 of plug P 3 and a 180 volt B supply should be connected to plu...

Page 7: ...ed out about 1 4 inch When this is done the dial and capacitor drive mechanism is disengaged and the knob is geared to the coil casting As the knob is turned the coil carriage is moved across the chas...

Page 8: ...s a shield provided to prevent unintentional throwing of the switch The A F GAIN control knob is lo cated to the right of the MAIN TUNING control It is used to adjust the audio amplification of the re...

Page 9: ...rol in phone reception is at one of the positions affording broad selectivity Po sitions 1or 2 are recommended Selectivi ty may be progressively increased by turn ing the SELECTIVITY control to posi t...

Page 10: ...ed to trystal peak an interfering signal may be attenuated by proper setting of the PHASING knob since this control does not appreciably affect the desired signal 3 1 Measurement ol Signal Strength To...

Page 11: ...n the table below and the ground lead connected to the receiver chas sis With 1 milliwatt output at the phone jack the test signal should be within the limits specified below Terminal Test Signal Firs...

Page 12: ...f broadcast ranges E F have also general coverage variable se ries padding capacitors All coils of ranges A B C and D have bandspread trim mer capacitors Variable series padding capacitors are used in...

Page 13: ...and the modulation of the signal generator turned off to pro vide a steady C 11 test signal The PHASING control of the receiver should be set at 0 and the SELECTIVITY con trol at 5 The A F GAIN contr...

Page 14: ...trimmer C 52 should be decreased to make correction Conversely low dial readings are corrected by increasing the capacity of trimmer C 52 It is imperative that the high fre quency oscillator circuits...

Page 15: ...ny band is the same as that described under Section 5 3 a above As stated previous ly Section 5 1 the adjustment of the general coverage trimmers must not be al tered at this time b First Detector and...

Page 16: ...ss AVC Cathode Bypass B Bypass AVC to Sec Det Coupling Power Supply Filter Power Supply Filter Crystal Filter Input Tuning Crystal Filter Phasing Control Crystal Filter Compensating Crystal Filter Out...

Page 17: ...C 11 R 23 R 6 C 8 JACK I ST R AMP 1ST OET COW H F OSC R 27 R 25 R 6 s 8 C 7 R 3 R 4 T I C 5 R 5 C 35 C 34 C 38 1 re Lri R 38 J r eY Altz meillilg C 26 iII II I R 37 i111i1i1 11 C 25 rt ARM R 7 Fr t i...

Page 18: ...Ceramic 500 mmf 500 vdcw F Band Gen Cov H F Osc Padder Ceramic 250 mmf 500 vdcw C 56 A Band bandspread H F Osc Padder Ceramic 29 mmf 500 vdcw B Band Bandspread H F Osc Padder Ceramic 12 mf 500 vdcw C...

Page 19: ...Inv Feedback Coupling Output Cathode Bias R F Gain Control B F Gain Bleeder H F Osc B Dropping H F Osc Grid Beat Osc Plate Filter Feat Osc Grid Beat Osc Screen Bleeder Beat Osc Screen Dropping Pi Volt...

Page 20: ...ower Supply Switch AC Switch P Switch Tone Control Switch Selectivity Control Switch T 1 Primary Selection Switch Power Transformer bid I F Transformer Det Input Transformer Beat Osc Transformer Audio...

Page 21: ...ngths Plug in type coils so located that they are readily accessible for interchanging are used to cover the frequency range of the re ceiver The HBO type micrometer dial cali brated from 0 to 500 pro...

Page 22: ...emml R 36 1 K R29 RF C GAIN to K R 3 7 LIMITER R46 4 C 56 HF OSC 6J5 Cu C217 S C 58 f R 3 SA CR 050 CW OSC R 3 4 6SJ7 C29 C 47 C4 C49 3 C 30C 32 S MET S B AVC C 33 A V C 6V6 C 3 6 R44 R45 AUDIO INVERT...

Page 23: ...HIPPED DATE VIA 0 X1D coh SHIPPED 7 23 47 TERMS DESCRIPTION ITC240DT speaker in unopened factory OX speaker applies only to UC240DT cre would have been as per letter paid me or anything Ref e7 any cus...

Page 24: ......

Page 25: ...supply NC 2 TSG 10 PM Loudspeaker in matching cabinet for the above receiver NC 2 40DR RECEIVER same as above but with receiver and loud speaker mounted on individual IA steel standard rack panels 101...

Page 26: ...NATIONAL COMPANY INC MALDEN MASS IT A SM 3300 8 46 PRINTED IN U S A ER 183 196...

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