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AEL FM-15QE, Instruction Manual

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Summary of Contents for FM-15QE

Page 1: ...www americanradiohistory com...

Page 2: ...X 77 006 INSTRUCTION MANUAL FOR AEL MODEL FM l5QE FM EXCITER May 1977 AMERICAN ELECTRONIC LABORATORIES INC A DIVISION of AEL INDUSTRIES INC Richardson Road Colmar PA 18915 www americanradiohistory com...

Page 3: ...ot subject to any misuse neglect improper installation negligence accident or unless authorized in writing by Seller repair or alteration Seller s exclusive obligation under all warranties and Seller...

Page 4: ...l 2 l 2 l 2 3 2 3 2 3 2 11 External Meter 2 3 2 12 RF Output 2 3 2 13 Installation Checkout 2 3 III OPERATION 3 l Controls and Indicators 3 2 Operating Procedure 3 l 3 l IV THEORY OF OPERATION 4 l 4...

Page 5: ...5 12 5 10 FM0 and Phase Lock Coarse Frequency Adjustment 5 12 5 11 IPA and PA Coarse Alignment 5 16 5 12 IPA and PA Final Alignment 5 16 5 13 FM0 and Phase Lock Modulation Level Adjustment 5 17 5 14 c...

Page 6: ...r Removed FM 15QE Exciter Bottom View with Cover Removed FM0 and Phase Lock Assembly Location of Parts IPA and PA Assembly Location of Parts Power Supply Regulator Assembly Location of Parts l 2 2 2 3...

Page 7: ...tput connectors the ac power line cord and fuse and the switch for selecting mono or stereo input signals The exciter is identified by a model number and serial number located on the rear panel All co...

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Page 9: ...Noise Stereo Separation MECHANICAL 3 l 2 in H X 19 in W X 14 in D Standard 19 in rack 12 lb 16 lb 131 F 55OC ambient 0 C to 55 C operating 15OC to 55 C with 30 min warm up ELECTRICAL 1050l 25 210 250...

Page 10: ...nputs 2 a Impedance b Level Distortion FM Noise below 75 kHz dev with 75 usec de emphasis Specification 55 dB 65 dB Better than 80 dB with optional harmonic filter 600 ohms balanced r10 dBm for 75 kHz...

Page 11: ...rates substantial quantities of heat forced air cooling may be required to keep the ambient temperature of the exciter within the specified range Secure the exciter to the rack using four 4 each no 10...

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Page 13: ...Mano Comp switch S3 to Comp 2 10 SCA TRANSMISSION If SCA transmission is to be used connect an SCA gen erator to SCA jaak J3 or J4 using a type BNC connector and RG 58 U cable br its equivalent Z 11 E...

Page 14: ...50 ohm 20 watts min RF load using a signal sampler having a 20 to 30 dB output 5 Connect a frequency counter to the signal sampler low level output 6 Accomplish operating procedure of paragraph 3 2 2...

Page 15: ...on indicator lights 3 Verify that AFC LOCKED indicator lights and RF output is indicated on meter within a few seconds NOTE The RF reading will vary somewhat depending on the RF load connected to the...

Page 16: ...vcc Power to integrated circuits I5 v Output of 15 Volt power supply 5 v Output of 5 Volt power supply Ref Reference oscillator level Fmo FM oscillator RF level IPA IPA power output IPA collector cur...

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Page 18: ...ulting sig nal is filtered and used to control the FM0 subassembly Thus the programmable div ider allows the use of the same high stability 8 MHz reference crystal regardless of channel assignment Not...

Page 19: ...panel meter The Shut Down output is not used Q4 provides level matching between the output of Ul fc 2 and the input of U2 U2 is a high speed divide by 10 circuit The output of U2 is therefore fc f 20...

Page 20: ...s then fed to Q2 where it shuts down the RF output and to Q13 which turns off the AFC LOCKED lamp 4 7 IPA AND PA The output of the FM0 and Phase Iock assembly approximately 100 mw is applied to Tl Ref...

Page 21: ...is bridge provides collector voltage for AlQ2 4 9 POWER AND SIGNAL DISTRIBUTION The FM0 and Phase tick IPA and PA and Power Supply Regulator assemblies are mounted on the main chassis of the exciter R...

Page 22: ...for the Power Supply Regulator assembly 5 3 TEST EQUIPMENT Table 5 1 lists the test equipment required for alignment and adjustment of the exciter 5 4 INTRODUCTION TO TROUBLESHOOTING Troubleshooting...

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Page 25: ...a w ct R2 111 U38 cR634 c 37 0 Ii e R34 0 l CI5 e R35 e R35 a a at at R45 R44 R45 R44 R654 R654 1 1 I I 0 0 T L T L FM0 TX77 006 6 Figure 5 3 FMU and Phase Lock Assembly Location of Parts 5 4 www ame...

Page 26: ...__ TX7 006 7 Figure 5 4 IPA and PA Assembly Location of Parts 5 5 www americanradiohistory com...

Page 27: ...l R9 as 0 1 l l l R8 R7 b l 1 Q4 7 70 t 3 3 1 ziii 1 0 l m Q6 43 Q9 ol i 1 0 4 I 0 0 l TX77 006 8 Figure 5 5 Power Supply Regulator Assembly Location of Parts 5 6 www americanradiohistory com...

Page 28: ...than 0 1 distortion Dual Trace 10 MHz Oscilloscope 110 MHz Counter Stability greater than 1 part in 106 QEI 671 Hewlett Packard 2OOCD Telequipment D54 Hewlett Packard 5245L with 5253 Plvg in Signal S...

Page 29: ...Rl defective t 15 Vdc supply regulator defective 5 Vdc supply regulator defective 1 Reference oscillator defective 2 Divide by 1600 counter defective 3 6 kHz buffer defective Corrective Action 1 Check...

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Page 31: ...lfunction Table 5 2 Troubleshooting Chart Cont d Probable Cause 4 Phase comparator and lock detector defective Corrective Action 4 Check UlO Qll and Q12 replace if defective www americanradiohistory c...

Page 32: ...ve this polarity when replacing the diode When removing a component having multiple leads always tag the leads to ensure correct reinstallation 5 7 ALIGNMENT AND ADJUSTMENT NOTE DO not attempt trouble...

Page 33: ...ven to check exciter alignment 5 9 FM0 AND PHASE LOCK AFC ADJUSTMENT 1 Connect oscilloscope to junction of A2C21 and A2R43 Adjust A2R47 for the greatest amplitude linear 5 kHz sawtooth obtainable 2 Co...

Page 34: ...0 0 0 0 0 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X...

Page 35: ...x X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X...

Page 36: ...xxxxxx x x x x x 104 3 X x x x x X x x x x 104 5 x x x x x x x x x x 104 7 X x x x X x x x x 104 9 x x x x x x x x x x 105 1 X x x x X x x x x x 105 3 X x x X x x x x x 105 5 x x X X x x x x x 105 7 X...

Page 37: ...ding in this position Set the MULTIMETER switch to the RF position Adjust A3C14 and A3C15 for a maximum reading in this position The coarse alignment is now complete Accomplish final alignment 5 12 IP...

Page 38: ...S3 in MONO position Adjust AZR31 until monitor reads 100 percent 3 Using a 400 Hz 4 Vpp 1 41 Vrms signal to Comp jack 52 Place S3 in position Adjust AXR 34 until monitor reads 100 percent 5 14 RECHEC...

Page 39: ...A 19446 or call 215 822 2929 extension 355 Provide the following information a Station call b Model and serial no i c Reference designation of part if applicable i e A4RlO d AEL part no or manufacture...

Page 40: ...echnical manual Title Drawing No Block Diagram FM Exciter 3050688 Schematic Diagram FM Exciter Chassis 4051139 Schematic Diagram Power Supply 4051141 Schematic Diagram FM Exciter Power Amplifier Schem...

Page 41: ...00 9 4 10 8 7 8 13 5000 2 0 3 3 0 3 12 7500 1 0 0 2 2 8 I5 10 000 3 1 1 6 5 4 I9 15 000 6 0 4 4 9 4 26 PANEL b ETER READINT S FM NOISE 72 dB vcc 43 15v 58 5v 3 REF A8 FM0 72 IPA 36 PA 31 RF 26 AM NOIS...

Page 42: ...ONS ARE IN INCHES AND INCLUDE PLATING THICKNESS WHEN SPECIFIED lfEADS ARE UNlFlED NATIONAL SERIES REMOVE ALL BURRS AND SHARP EDGES U FX UIiZ IN ACCORDANCE WITH MFG VENDOR ITEM SEE SPECIFICATION OR SOU...

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