Emerson-Radio-and-Phonograph-Corp-1002 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS EMERSON RADIO I Symbol I f *art * I DESCRIPTION MODELS: 1002, 1003 I Cl, C2 I 900070 I Two-gang variable condenser tPartNo. DESCRIPTION CHASSIS MODEL: 129003 The second i-f transformer (T2) is mounted on top of the chassis to the right of the speaker.

2、The trimmers (C7, C8) are accessible through holes in the top of the can. The trimmer for the antenna (C3) and the trimmer for the oscillator coil (C4) are located on the variable condenser. The trimmer on the front section is for the oscillator coil. I-f Alignment 1. Rotate the variable condenser t

3、o the minimum capacity position. 2. Feed 455 kc to the converter grid (stator of the r-f section of the variable condenser) and adjust the four i-f trimmers (C5, C6, C7, C8) for maximum response. Cl, C2 *C3, C4 *C5, C6, ( C7,C8 f C9, C15,1 C20, C25 j Two-gang variable condenser Trimmers, part of var

4、iable condenser Trimmers, part of i-f transformers 0.002 mfd., 600 volt condenser R-f Alignment 3. Connect the oscillator to a coil composed of three or four turns of wire wound in a circle approximately 12 in diameter. This coil should be held parallel to and in line with the loop antenna of the re

5、ceiver at a distance of 15 to 20 inches. -2. Radiate a signal at 1425 kc, set the dial indicator to 1425 kc, and adjust tbe trimmers on the variable condenser (C3, C4) for maximum response. 3. Radiate a 600 kc signal and tune in the signal on the receiver. Adjust the loose outside turn of the loop a

6、n tenna for maximum response. This loose turn may be moved to either side of the center. Fasten it in the posi tion which gives maximum response. 4. Repeat steps 2 and 3 until no further improvement is evident. I F PEAKED AT 485 K C. CIO Cll, 02,1 C21 j 03 920240 0.0005 mfd., 600 volt condenser 9200

7、20 0.02 mfd., 400 volt condenser 920040 0.1 mfd., 200 volt condenser 04 910010 0.00011 mfd. mica condenser 06 920050 0.2 mfd., 200 volt condenser 07, C24 920030 0.05 mfd., 400 volt condenser 08, 09 925011 50-50 mfd., 150 volt dual electrolytic condenser C22 920060 0.05 mfd., 200 volt condenser C23 9

8、25180 10 mfd., 25 volt electrolytic condenser Ll 700000 Loop antenna R1 340810 22,000 ohms, Y watt resistor R2, R9 397000 15 meg., Y watt resistor R3, R4 351130 470,000 ohms, Y watt resistor R5 340290 150 ohms, Y watt resistor R6 370490 1000 ohms, 1 watt resistor R7, R14 351330 3.3 meg., Y watt resi

9、stor R8 390190 0.5 meg. volume control RIO 351050 220,000 ohms, Yz watt resistor Rll 340010 10 ohms, Y watt resistor R12 340050 15 ohms, Vz watt resistor R13 390180 0.5 meg. volume control (sets below 8,767,450), or R13 390014 2 meg. volume control (sets 8,767,450 and higher) R15 340410 470 ohms, Y watt resistor R16 351050 220,000 ohms, J4 watt resistor (sets below 8,767,450), or R16 340970 100,000 ohms, Yz watt resistor MRTS, A TRIMMER & A FIXED CONOENSER 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