Galvin-Mfg-Co（Motorola）-9-49 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS ALIGNMENT PROCEDUBE Place the radio on the service bench with the front cover removed, but with the speaker and bat tery connected to It. Turn the volume control to maximum position and leave It there throughout the alignment, re d

2、ucing the signal generator output If necessary. NOTE; Do not adjust the trimmer In the R.F. coll can that Is covered with Scotch Tape. The original adjustment, made In the factory, should not be tampered with. (Fig* 1 below, shows 3-11 trimmer locations.) I.F. ALIGNMENT 1. Connect the signal generat

3、or to the con trol grid (Terminal No, 6) of the Osc.-Mod. tube (TBS), Turn the condenser gang completely out or mesh. Connect an output meter across speaker voice coll. 2. Set the signal generator at 262 K.C. and carefully adjust the single trimmer in the Diode coll can to the point showing the high

4、est reading on the output meter. 3. Adjust the two trimmers In the I.F. coll can to the point showing the highest output read ing. 4. Repeat the I.F. and Diode adjustment sev eral times for maximum accuracy. SETTING THE RANGE 1. Connect the signal generator to the con trol grid (Terminal No. 6) of t

5、he R.F. tube (TAT) using the same .1 MF condenser, 2. Set the signal generator at 1550 K.C. and with the condenser gang completely out of mesh, adjust the 1550 K.C. trimmer in the oscillator coll can to the point showing the highest output reading. 3. Set the signal generator at 535 K.C. Turn the co

6、ndenser gang completely in mesh and adjust the 600 K.C. trimmer In the Oscillator coll can for the highest output reading. NOTE; The adjustments above set the range p the receiver will track with the calibrations in the control head. R.F. AND ANTENNA ALIGNMENT 1. Connect the signal generator to the

7、anten na lead through a 40 IHF condenser and to ctessls ground. Set the signal generator at 600 K.C. and turn the condenser gang until the signal Is heard. Adjust the 600 K.C. trimmer on the antenna coll can for the maximum output reading. 2. Set the signal generator at 1400 K.C. Tn the condenser ga

8、ng until the signal is heard. Ad just the 1400 K.C. trimmer In the antenna coll can for maximum output reading. 3. Adjust the 1400 K.C. trimmer In the R.F. coll can for maximum output reading. 4. Recheck steps 1, 2, and 3, for accuracy. SENSITIVITY AND STAGE GAIN MEASUREMENTS starting itli tlie I.F.

9、, and dFklng bach step by ap to by*evldsncs StSSirrSSl ./.bo.t.bi. ill stago-gain “StotbaSlDmlSlStStJbl WoSalSor, /?Mob:i5.(Sss:ctdr.“.rrS.g/co“s.gno .rtab.gno lo. which has been removed. wuen measuring fieSeslntl taWeilk averagaaUowance must-be made for bSL!;/;rS?rfr gSSl typo, a. to dllt.nc. .r tb

10、. Cli.ct.rl.tlc., to. Average Microvolt Input * Generator Set at Generator Feeder Connected to Dummy Antenna Leak Capacity Resistance Output Meter Reading * 25,000 262 K.C. 262 K.C. 600 K.C. 600 K.C. 600 K.C. Grid(I.F.) Grid(Mod.) Grid(Mod,) Grld(R.F.) Ant. Lead .1 MF .5 Meg. 1.T4 Volts .1 MF ,5 Meg 1.T4 Volts .1 MF .5 Meg 1.T4 volts .1 MF .5 Meg 1.T4 Volts 40 MMF None 1.T4 volts * For one watt output. Model 9-49 * eter connected across voice coll. V.C. Impedance - 3 ohms at 400 cycles. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN