Philco-Radio-and-Television-Corp-ST998 电路原理图.pdf

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1、104 收音机爱 好者资料库 RadioFans.CN FM ALIGNMENT ALIGNMENT PHILCO AM FM RADIO (Continued from preceding page. ) MODELS ST997 AND ST998 Bottom View-Perma-Circuit Panel-Models ST997 and ST998 SIGNAL GENERATOR RADIO STEP CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS ADJUST RADIATING LOOP (

2、SEE NOTE 1) 455 KHZ TUNING GANG FULLY OPEN ADJUST FOR MAX. OUTPUT IN ORDER GIVEN T8 T6 6 T10 2 SAME AS STEP 1 1650 KHZ TUNING GANG FULLY OPEN ADJUST FOR MAX. OUTPUT. VC T D AM OSC. 3 SAME AS STEP 1 1400 KHZ 1400 KHZ ADJUST FOR MAX. OUTPUT. VC T C ANT. TRIM. 4 SAME AS STEP 1 600 KHZ 600 KHZ ADJUST FO

3、R MAX. OUTPUT. RDCK TUNING GANG DURING ADJUSTMENT. T 1 1 AM OSC. STEP CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS ADJUST 1 COLLECTOR OF Q1 THRU .01 MF CAPACITOR 10 7 MHZ 75 KHZ SWEEP TUNING GANG FULLY OPEN ADJUST FOR MAXIMUM OUTPUT IN ORDER GIVEN REDUCE GENERATOR OUTPUT AS NEC

4、ESS. T9 A, T7. T5 6 T 4 2 SAME AS STEP 1 10 7 MHZ 30% AM TUNING GANG FULLY OPEN ADJUST FOR MINIMUM OUTPUT (A NULL BETWEEN TWO PEAKS) T9B 3 REPEAT STEPS 1 AND 2 UNTIL NO FURTHER IMPROVEMENT IS OBTAINED 4 CONNECT TO ANTENNA TERMINAL THRU 47 OHM RESISTOR 87.5 MHZ 75 KHZ TUNING GANG FULLY CLOSED ADJUST

5、FOR MAX. OUTPUT. T3 (SEE NOTE A) FM OSC. 5 SAME AS STEP 4 108 5 MHZ 75 KHZ TUNING GANG FULLY OPEN ADJUST FOR MAX. OUTPUT. VC T B FM OSC. 6 REPEAT STEPS 4 AND S UNTIL NO FURTHER IMPROVEMENT IS OBTAINED. 7 SAME AS STEP 4 90 MHZ 75 KHZ 90 MHZ ADJUST FOR MAX OUTPUT. T2 e SAME AS STEP 4 10SMHZ 75 KHZ 105 MHZ ADJUST FOR MAX. OUTPUT. VCTA 105 收音机爱 好者资料库 RadioFans.CN