Galvin-Mfg-Co（Motorola）-57X12 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS * * I- 1 I JWH| lol | oT . “I _J lOo *4 2 Ng I JHUl loot on ii- 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS M0DELS 57X11 a 57X12 A low range output meter should be connected across the speaker voice coll. Set receiver volume

2、 control to maximum; for greatest accuracy keep out put of receiver at approximately ,05 watt throughout alignment by reducing generator output (not receiver volume control) as stages are brought Into align ment. (.05 watt = .40 volt on output meter). The alignment tool should be of an Insulated typ

3、e* STEP DIAL DUMMY SIGNAL SET GENERATOR TO CONNECTED TO IF ALIGNMENT 1. Gang fully opened Osc-Mod grid * If receiver Is operated from AC line during alignment, It Is suggested that an isolating trans former be used between reoe lver and power line. If no Isolation transformer Is used and hum Is enco

4、un tered during alignment, connect the ground side of the signal generator to B- Instead of the receiver chassIs. SIGNAL GENERATOR SET TO ADJUST TRIMMER OR CORE 1,2,3 then set pointer to 1600 Kc by turning tuning knob till pointer lines up with right hand calibration mark. * connect output of signal

5、 generator to a 5* diameter, 3 turn loop and bring loop close, enough to recelvor loop to obtain output of 50 milliwatts (.40V) on output meter. Vary distance between loops to maintain this output during alignment. Minimum distance between loops should never be lessthan -tlf-i:=:-rt) Circuit diagram

6、 fl-pointer is on page 107. NOTE* USE 18 LB. TEST FISHLINE. FIX CORO KNOT WITH A DROP OF CEMENT. STRING DRIVE DETAIL -WITH GANG FULLY 1600 KC. _ CLOSED SET POINTER CALIB. MARK TO LEFT HAND CALIBRA TION MARK ON DIAL BACKGROUND. GANG FULLY j START | I A o e ofisssa FINISH/ 3 1/2 TURNS AROUND TUNING SHAFT. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN