Marconi Instruments TF 1066B/6 Manuel d'instructions

TM 11-6625-3017-14TECHNICAL MANUALOPERATOR’S ORGANIZATIONALDIRECT SUPPORT AND GENERAL SUPPORTMAINTENANCE MANUALFORFM/AM MODULATION METERME-505 / U(NSN

TM 11-6625-3017-14Characteristics Performance Supplementary InformationDeviation range: Six ranges with full scaleindications of 1.5, 5, 15, 50,150 an

TM 11-6625-3017-14Characteristics Performance Supplementary informationL.F. outputFrequency range: 30 Hz to 200 kHz with switchable Typical response

TM 11-6625-3017-14Response curves for meter and 1. f. output with de-emphasis off.Fig. 1-2. Typical demodulated f.m. frequency response with interna

TM 11-66253017-141.3 ACCESSORIESSupplied Extension Board type TM 7926; for use when servicing printedcircuit boards.Mains Lead type 23424A158Optional

TM 11-6625-3017-14SECTION 2OPERATION2.1 INSTALLATIONThe Modulation Meter type TF 2300A is available intwo versions: with a case for bench mounting, or

TM 11-6625-3017-14lock-plate secured by two screws above the switch, slidethe switch button into its other position (as shown on thepanel), reverse an

TM 11-6625-3017-14Fig. 2-2. Front panel controlsFig. 2-3. Rear panel(19) Supply plug. Accepts Mains Lead type TM 7052for a.c. operation.(20) H.T. f

TM 11-66253017-142.4 PREPARATION FOR USEIt is helpful in reading these instructions and in usingthe instrument until completely familiar with its oper

TM 11-6625-3017-14switch to SET CAL and check that themeter reads SET. If necessary, adjust thef.m. calibration by inserting a screwdriver inthe SET

TM 11-6625-3017-14TABLE 2.2Spurious deviations with increasing % a.m.1. LEVEL control set for meter reading at top end of arc.2. A.M. frequency = 1

TM 11-6625-3017-14

TM 11-6625-3017-14For noise measurements in other bandwidthsselect the MAX MOD FREQUENCY 200 kHz band- widthsetting and use a similar type of low-pass

TM 11-6625-3017-14actual reading will depend on frequency tolerances in thesource and local oscillator output. Switch to DEV +.(5) Modulate the carri

TM 11-6625-3017-14The oscillator takes about two minutes tostabilize after turning on, but this is only of anysignificance at very high frequencies.2.

TM 11-6625-3017-14then causes the meter reading to fluctuate, carrier shift ispresent. The extent of the shift may be measured byconnecting a counter

TM 11-6625-3017-14Example : To find the fundamental crystal frequency foran r. f. input of 83.666 MHz:1) Consulting Table 2. 4, it can be seen that

TM 11-662 5-3014-14The test arrangement for measuring distortion inan f.m. stereo transmitter is shown for measurements onthe G. E. -Zenith system i

TM 11-662 5-3014-14Fig. 2-7. Derivation of compositestereo signal showing unbalance andphase shift errorsThe test arrangement for measuring channelse

TM 11-6625-3017-14(2) Apply a test signal to the left channel at 15 kHzmodulation frequency (for example) with no signal on theright channel.(3) C

TM 11-6625-3017-14Table 2.5.DECIBEL CONVERSION TABLERatio Down Ratio UpVOLTAGE POWER DECIBELS VOLTAGE POWER1•0 1•0 0 1•0 1•0•9886 •9772 •1 1•012 1•023

TM 11-6625-3017-14Table 2-5. DECIBEL CONVERSION TABLE (continued)Ratio Down Ratio UpVOLTAGE POWER DECIBELS VOLTAGE POWER•1585 •02512 16 6•310 39•81•1

TM 11-6625-3017-14Technical Manual HEADQUARTERSDEPARTMENT OF THE ARMYNO. 11-6625-3017-14 Washington, DC, 17 September 1981OPERATORS, ORGANIZATIONAL, D

TM 11-6625-3017-14SECTION 3TECHNICAL DESCRIPTION3.1 SYSTEM OPERATIONGeneral operation of the TF 2300A ModulationMeter can be explained with reference

TM 11-6625-3017-14Fig. 3-2. Operation of discriminatorFrom this point onwards, all sections are commonto f. m. and a. m. and it is necessary to retur

TM 11-6625-3017-14itors. One switch, SA, on the back panel selects themains voltage range, and another, SB, the power sourcewhich may be mains or bat

TM 11-6625-3017-143.5 I.F. AMPLIFIER (Unit A3-Fig. 7-2)This board, in the narrow box alongside the localoscillator and power unit, contains three ampl

TM 11-6625-3017-14Since the multivibrator runs at constant frequency,the positive-going pulses from Q4 are at equal timeintervals. Q7 and Q8 divide th

TM 11-6625-3017-14Q2; one via a switch, so that on the 5 to 500kHzdeviation ranges the meter circuit is connected toterminal 7, and the other from t

TM 11-6625-3017-14SECTION 4MAINTENANCE4.1 INTRODUCTIONThis section contains information for keeping theequipment in good working order and for checkin

TM 11-6625-3017-14Fig. 4-1. units and parts location (top)4-2

TM 11-6625-3017-14Fig. 4-2. Units and parts location (bottom)4-3

TM 11-6625-3017-14Table 4.1. Test Equipment Required.Item Type Minimum specification Recommended modela A. M. signal Output: 100 mV across 50 Q TF 20

TM 11-6625-3017-14CONTENTS (Continued)Paragraph PageMeasuring f.m. deviation 2-5 2-4Measuring a.m. depth 2-6 2-5Measuring f.m. on a.m. 2-7 2-5Measu

TM 11-6625-3017-14I.F. output and frequency(6) Connect the frequency meter and voltmeter to theI.F. OUT socket and check that the i.f. isapprox.200 m

TM 11-6625-3017-14Function switch to SET CAL and, without disturbing theSET CAL F. M. preset, bring the meter reading to theSET mark by adjust-ing the

TM 11-6625-3017-14To ensure that the latter output is due to the modulationmeter alone it is important that the source should beexceptionally free fro

TM 11-6625-3017-142nd harmonic: (fl -f2): 2 kHz3rd harmonic: (2f2 -fl): 12 kHzand express them in dB’s relative to 0 dB. Add +6 dB tothe 2nd harmoni

TM 11-6625-3017-14Fig. 4-8. Oscillator lubrication points4-9

TM 11-6625-3017-14SECTION 5REPAIR5.1 INTRODUCTIONThis chapter contains information for thelocalization and repair of faults. Performance limitsquoted

TM 11-6625-3017-14OSCILLATOR TUNE and LEVEL controls, a meterdeflection in the black arc can be obtained. If so,the local oscillator, mixer and i. f.

TM 11-6625-3017-14The conditions to obtain these waveforms are as follows:DE-EMPHASIS switch to OFF. Function switch to SET CAL.Fig. 5-1. Oscillogra

TM 11-6625-3017-14TABLE 5.2Test Equipment Required for RealignmentItem Type Minimum specification Recommended modela Multimeter Range: 0 - 20 V d. c.

TM 11-6625-3017-145.4.3Power supplyTest equipment:- a, b, c and d(1) Measure the output of the -18 V and -12 Vregulated supplies at the points illustr

TM 11-6625-3017-14CONTENTS (Continued)PageSECTION 6 CIRCUIT DIAGRAMCircuit notes 6-1APPENDICESAPPENDIX A References A-1B Maintenance allocation B-1LIS

TM 11-6625-3017-14Output Attenuator: 30 or 40 dB.Sweep Width control: maximum sweep.Centre Frequencycontrol: mid-way.Y1 Gain control: maximum gain.Y1

TM 11-6625-3017-14(2) Connect the voltmeter to the OUTPUT terminals.(3) Turn the DE-EMPHASIS switch to 75 µ sec, theFunction switch to DEV+ and the MA

TM 11-6625-3017-145.4.10 Set l.f.Test equipment: 1(1) Connect the crystal oscillator to the R. F. IN socket.(2) Turn the oscillator RANGE switch to EX

TM 11-6625-3017-14Limiter and discriminatorAll thirteen connections are soldered; the completeunit can be removed after these have been unsolderedby r

TM 11-6625-3017-14Fig. 5-5. Parts location, Mixer TM 77235-10

TM 11-6625-3017-14Fig. 5-6. Parts location, Oscillator Board TM 77055-11

TM 11-6625-3017-14Fig. 5-7. Parts location, Doubler and Generator Board TM 77065-12

TM 11-6625-3017-14Fig. 5-8. Parts location, I.F. Amplifier ATM 71325-13

TM 11-6625-3017-14Fig. 5-9. Parts location, Limiter ATM 72855-14

TM 11-6625-3017-14Fig. 5-10. Parts location, Discriminator ATM 77805-15

TM 11-6625-3017-14CONTENTS (Continued)LIST OF ILLUSTRATIONS (Continued)PageFig. No. 4-5 F.m. distortion measurement 4-74-6 Summation of dB levels 4-8

TM 11-6625-3017-14Fig. 5-11. Parts location, 1st L.F. Amplifier ATM 72235-16

TM 11-6625-3017-14Fig. 5-12. Parts location, 2nd L.F. Amplifier ATM 88065-17

TM 11-6625-3017-14Fig. 5-13. Parts location, Peak Reading Voltmeter ATM 88055-18

TM 11-6625-3017-14Fig. 5-14. Parts location, A.M. Defector ATM 72765-19

TM 11-6625-3017-14Fig. 5-15. Parts location, Calibrator ATM 76205-20

TM 11-6625-3017-14Fig. 5-16. Parts location, Power Supply Board ATM 72255-21

TM 11-6625-3017-14Fig. 5-17. Parts location, Component Board ATM 87425-22

TM 11-6625-3017-14APPENDIX AREFERENCESDA Pam 310-4 Index of Technical Manuals.TM 11-6625-537-15 Operator’s, Organizational, Field and Depot Maintenanc

TM 11-6625-3017-14SECTION 6CIRCUIT DIAGRAMCIRCUIT NOTES1 ARRANGEMENTThe inter-unit wiring diagram, FO 6-1,shows all sub-assembly units inthe equipment

TM 11-6625-3017-14APPENDIX BMAINTENANCE ALLOCATIONSection I. INTRODUCTIONB-1. GeneralThis appendix provides a summary of the maintenanceoperations cov

TM 11-6625-3017-14SECTION 0INTRODUCTION0-1. SCOPEThis manual describes F.M./A.M. Modulation Meter ME-505/U (Marconi Model TF 2300A) (fig. 1-1) and p

TM 11-6625-3017-14k. Rebuild. The highest degree of materielmaintenance. It consists of restoring equipment asnearly as possible to new condition in

TM 11-6625-3017-14SECTION II. MAINTENANCE ALLOCATION CHARTFORMODULATION METER ME-505/U(1) (2) (3) (4) (5) (6)GROUP MAINTENANCE MAINTENANCE CATEGORY T

TM 11-6625-3017-14SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTSFORENCODER-DECODER KY-883/GSCTOOL OR TEST MAINTENANCE TOOLEQUIPMENT CATEGORY NOMEN

TM 11 6625-3017-14SECTION IV. REMARKSREFERENCE REMARKSCODEA Replacement of knobs, fuses and lamps.B Repaired by replacement of boards.C Repair boards

By Order of the Secretary of the Army:E. C. MEYERGeneral, United States ArmyChief of StaffOfficialROBERT M. JOYCEBrigadier General, Unites States Army

TM 11-6625-3017-14FO Fig. 6-1. Chassis inter-unit wiring

TM 11-6625-3017-14FO Fig. 6-2. Mixer, oscillator and i.f. amplifier

TM 11-6625-3017-14FO Fig. 6-3. Limiter, discriminator and 1st l.f. amplifier

TM 11-6625-3017-14FO Fig. 6-4. 2nd l.f. amplifier and peak reading voltmeter

TM 11-6625-3017-14FO Fig. 6-5. A.M. detector and calibrator

TM 11 6625-3017-14SECTION 1GENERAL INFORMATION1.1 INTRODUCTIONThe TF 2300A Modulation Meter is primarily formeasurement of f.m. deviation but it also

TM 11-6625-3017-142300A (USA)JAN 1974FO Fig. 6-6. Power supply unit

PIN: 049597-000

This fine document...Was brought to you by me: Liberated Manuals -- free army and government manualsWhy do I do it? I am tired of sleazy CD-ROM sell

TM 11-6625-3017-141.2 DATA SUMMARYCharacteristics Performance Supplementary informationR.F. inputFrequency range: 4 MHz to 1000 MHz.Sensitivity: Less