Emerson-Radio-and-Phonograph-Corp-515 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS EMERSON RADIO Schematic tPart No. Symbol DESCRIPTION MODELS: 512, 515, 516, 550 C5, C15, 920010 0.002 mfd., 600 volt condenser CHASSIS MODELS: 120006, 120056 530 C20 The 455 kc wave-trap .is located below the chassis deck. C6, C18 920060 0.05 mfd., 200

2、 volt condenser C7, C19 910010 The trimmers for the antenna and oscillator coils are located on the .variable condenser. The trimmer on the front C12, C17 910000 0.00022 mfd., mica condenser section is for the oscillator coil. C13, C14 920020 0.02 mfd., 400 volt condenser The oscillator coil is loca

3、ted underneath the chassis. The C21, C22 920030 0.05 mfd., 400 volt condenser loop antenna acts as the antenna coil. C23, C24 925110 30-50 mfd., 150 volt dual electrolytic l-f and Wave-Trap Alignment C23, C24 925011 50-50 mfd., 150 volt dual electrolytic Swing the variable condenser to the minimum c

4、apacity condenser (chassis 120056) position. Feed 455 kc to the grid of the 12SA7 or 14Q7 C25 920050 tube through a 0.1 mfd. condenser and adjust tfee four i-f trimmers for maximum response. LI 700010 Loop antenna L2 708060 455 kc wave trap Feed 455 kc to the external antenna lead and adjust the R1

5、310730 wave-trap for minimuin response. R2, R6 310810 22,000 ohms, Y watt resistor R-f Alignment R3 310870 39,000 ohms, Y watt resistor Set the dial pointer at 140. Set the signal generator at R4, R14 397000 15 meg, Y watt resistor 1400 kc and feed its output into a loop of wire about 12 R5, R10, 32

6、1130 470,000 ohms, Y watt resistor inches in diameter. Hold this radiating loop about 12 inches Rll from and parallel to the receiver loop antenna.Advance the R7 321330 3.3 meg., Y watt resistor output of the signal generator until deflection is obtained on *R8 the output meter. Adjust first the osc

7、illator trimmer (on front transformer section of variable condenser) then the antenna trimmer (on rear section of variable condenser) for maximum response. R9 390180 0.5 meg. volume control R12 340290 150 ohms, Yz watt resistor If the loop antenna has been replaced it may be neces- sary to adjust th

8、e loop inductance as follows. Align at 140. R13 370490 1,000 ohms, 1 watt resistor Set the pointer at 60 and feed 600 kc to the antenna lead. R15 340050 15 ohms, Yz watt resistor A portion of the outside turn of the loop may be swung to R16 340010 10 ohms, Y* watt resistor either side of the center to give maximum response. Realign at 140. R17 321050 220,000 ohms, Y* watt resistor 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