Olympic-Radio-and-Television-Inc-441 电路原理图.pdf

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1、MANUAL OF 19SS MOST-OFTEN-NEEDED RADIO DIAGRAMS OLYMPIC RADIO MODEL 441 OLYMPIC RADIO these screws are accessible through the notched corners of the antenna loop back. Also remove the screws holding the upper right and left hand corners of tne antenna loop back to the cabinet. The chassis can then b

2、e easily removed. Equipment required: Modulated RF signal generator; output meter; insulated screw-driver, two .1 mfd 400 volt condensers. To insure proper alignment, a radiated signal will be required during part of the alignment procedure. To radiate a signal, connect a loop of about 6 inches in d

3、iameter (one turn of #14 or #12 wire) across the output of the signal genera tor, and place this loop parallel to the loop of the receiver to be aligned, at a distance of about 10 or 12 inches. A calibration chart is provided on the variable condenser pulley for convenience in setting the variable c

4、ondenser to the alignment frequencies. These markings are referenced against tne line stamped on the dial pulley mounting strap. Connect the output meter and signal generator as follows: Output meter: Connect across the speaker voice coil and turn the volume control to maximum (extreme clockwise pos

5、i tion). Signal generator: When the generator is not used to radiate a signal, connect the low side to the receiver chassis through a .1 mfd condenser, clip the high side to the point at which signal injection is required, and keep the output as low as possible. Proceed in the sequence shown in the

6、alignment chart. When the alignment process is completed, turn the tuning knob shaft until the tuning condenser plates are fully meshed. Replace the chassis inside the cabinet, insert and tighten the screws previously removed, and assemble the two knobs on their shafts at the front panel. With the c

7、ondenser plate fully meshed place tne dial pointer on its shaft so that it points directly to the horizontal line at the 55 end of the dial. POINTER DIAL SHAFT ALIGNMENT PROCEDURE CHANT STEP CONNECT HIGH SIDE OF SIGNAL GENERATOR TO- SET SIGNAL GENERATOR TO- TURN RECEIVER DOM. TO- ADJUST THE FOLLOWIN

8、G FOR MAXIMUM OUTPUT. (KEEP SIGNAL FROM SIGNAL GENERATOR AS LOW AS POSSIBLE.) 1 ANTENNA SECTION TUNING CONDENSER IN SERIES WITH .1 MFD CONQ 455 KC. FULL CLOCKWISE POS ITION. (CONDENSER PLATES FULLY OPEN) L4, L3. L2, LI AND REPEAT IN SAME OROER (1st AND 2nd. I.F TRANSFORMERS) 2 USE RADIATED SIGNAL 15

9、00 KC. 1500 KC. ON CALIBRATION LABEL (ISO ON DIAL ) C2 (OSCILLATOR TRIMMER) 3 1500 KC maximum signal APPROX. 1500 ON CALIBRATION LABEL (ISO ON DIAL) Cl (ANTENNA TRIMMER) 4 REPEAT STEPS 2 AND 3 C2 OSC. TRIMMER POWER SWITCH a VOLUME CONTROL V, ANTENNA L00P- ON CABINET BACK LINE CORD 62 收音机爱 好者资料库 RadioFans.CN