Emerson-Radio-and-Phonograph-Corp-534 电路原理图.pdf
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Emerson-Radio-and-Phonograph-Corp-534 电路原理图.pdf
MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS g-m-y -m 0 frequency range: merson nculio MODELS: 514, 534 CHASSIS MODEL: 120007 An oscillator with frequencies of 455, 600, 1600 and 12,000 kc is required. An output meter should be used across the voice coil or output transformer for observing maximum response. Always use as weak a test signal as possible when align ing the receiver. l-f Alignment Swing the variable condenser to the minimum capacity position. Feed 455 kc to the grid of the 12SG7 tube through a 0.1 mfd. condenser and adjust the four i-f trimmers for maximum response. The color coding of the i-f transformer leads is as fol lows: Gridgreen Plateblue Grid returnblack B | red feed 12 megacycles from the generator to the external an tenna lead emerging from the rear of the chassis. Adjust first the short-wave oscillator trimmer and then the short wave antenna trimmer for maximum response. Rotate the wave-band switch clockwise to the broadcast position. Set the dial pointer at 160 and feed 1600 kc from the signal generator into a loop of wire about 12 inches in diameter. Hold this radiating loop about 12 inches from the loop antenna and advance the signal gen erator until a deflection is obtained on the output meter. Adjust first the oscillator trimmer (rear section of the vari able condenser) and then the antenna trimmer (front section of the variable condenser) for maximum response. Note: The grid of the 12SG7 tube is the No. 4 pin. R-f Alignment Rotate the wave-band switch counter-clockwise to the short-wave position. Set the dial pointer at 12 megacycles and using a 400 ohm carbon resistor as a dummy antenna If the loop has been replaced it may be necessary to ad just the loop inductance as follows: Align at 1600. Set the pointer at 60 and feed 600 kc into the radiating loop. A portion of the outside turn of the loop may then be swung to either side of the center to give maximum response. Re align at 1600. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN
