Noblitt-Sparks-Industries-Inc-RE-278-1 电路原理图.pdf

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1、MANUAL OF 19SS MOST-OFTEN-NEEDED RADIO DIAGRAMS Arvin INDUSTRIES, INC., MODEL 840T - 842T RE 278-1 Position of Variable Frequency of Generator Dummy Antenna Generator Output Connection Trimmers Adj. in order shown for Maximum Output Function of Trimmer Open 455 Kc. .05 uf Pin 8 12SA7 Al. A2 I. F. 14

2、00 Kc. 1400 Kc. 50 (xpf Antenna Lug with Hank re - moved_ * A3 Oscillator * Since the antenna section of the variable capacitor has no trimmer, the rotor of the variable should be rocked back and forth on both sides of 1400 Kc while adjusting the oscillator trimmer for maximum output. Check sensitiv

3、ity at 600 Kc. If weak, adjust antenna section plates for maximum output at 600 Kc. Tracking of the capacitor at points other than 1400 Kc is ac- complishedby bending the outside plates on the variable capacitor rotor, which are cut for this purpose. The alignment procedure should be repeated stage by stage in the original order for greatest accuracy. Always keep the output from the test oscillator at its lowest possible value to make the AVC action of the receiver ineffective. TUBE LAYOUT OUTLINE 收音机爱 好者资料库 RadioFans.CN