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Army Communication Systems Telephone Circuit ConditioningTelephone Circuit ConditioningValidation InformationContentsSkill Level 1IntroductionContentsLesson 1. Noise and Interference MeasurementsIdle Circuit Noise Test.Recording of test data.Figure 1-2. Idle circuit noise data sheet, sample.Impulse Noise Test.Figure 1-3. Impulse noise test, block diagram.Figure 1-4. Impulse noise data sheet, sample.Performing the test.Test arrangement.Performing the test.Figure 1-6. Harmonic distortion data sheet, sample.Intermodulation Distortion.Single-Tone Interference.Figure 1-7. Single-tone interference test, block diagram.Performing the test.Figure 1-8. Single-tone interference data sheet, sample.Figure 1-9. C-message weighting curve.Maximum Change in Audio Frequency.Recording of test data.Figure 1-11. Maximum change in audio-frequency data sheet, sample.Terminal Impedance.Test arrangement.Figure 1-12. Terminal impedance tests, block diagram.Performing the tests.Figure 1-13. Terminal impedance data sheet sample.Output circuit terminal impedance.Longitudinal Balance.Recording of test data.Performing the tests.Output circuit.Figure 1-16. Longitudinal balance data sheet, sample.Phase Jitter.Test arrangements.Figure 1-17. Typical phase jitter test arrangement, block diagramFigure 1-18. Effect of phase jitter on lissajous pattern oscilloscope display.Figure 1-19. Phase jitter data sheet, sample.Performing the test.Study ExercisesStudy Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Lesson 2. Equalizing ProceduresEnvelope-Delay Distortion.Definitions.Figure 2-1. Envelope-delay-distortion test, block diagram.Performing the test, end-to-end method.Calculating relative delays.Calibration and adjustment of controls.Figure 2-2. Envelope-delay-distortion data sheet, sample.Preparation.Amplitude-Frequency Response.Test arrangement.Figure 2-3. Frequency response test, block diagram.Performing the test.Figure 2-4. Frequency response data sheet, sample.Equalizing.Equalizer used.Correcting delay distortion.Figure 2-6. Typical delay characteristics of individual sections.Correcting amplitude distortion.Study ExercisesStudy Exercises (Cont)Study Exercises (Cont)Figure 2-7. Graph of delay limits in parameter S3.Study Exercises (Cont)Study Exercises (Cont)Figure 2-8. Graph of loss variation in parameter S3.Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Lesson 3. Record KeepingRecord Filing System.Practical value of records.Figure 3-1. Circuit history file.Equipment utilization recordsFigure 3-2. Equipment utilization record, sample.A nonformatted reportNumbering.Quality Control.Table I. Circuit Quality Control Test ScheduleParameter information.Figure 3-3. Circuit Parameter Test Report, Sample.Table II. Index of Test DescriptionTable II. Index of Test Description (cont)Study ExercisesStudy Exercises (cont)Study Exercises (cont)Study Exercises (cont)Study Exercises (cont)Solution SheetSolution Sheet (Cont)Solution Sheet (Cont)Solution Sheet (Cont)Solution Sheet (Cont)Solution Sheet (Cont)
Army Communication Systems
Telephone Circuit ConditioningTelephone Circuit ConditioningValidation InformationContentsSkill Level 1IntroductionContentsLesson 1. Noise and Interference MeasurementsIdle Circuit Noise Test.Recording of test data.Figure 1-2. Idle circuit noise data sheet, sample.Impulse Noise Test.Figure 1-3. Impulse noise test, block diagram.Figure 1-4. Impulse noise data sheet, sample.Performing the test.Test arrangement.Performing the test.Figure 1-6. Harmonic distortion data sheet, sample.Intermodulation Distortion.Single-Tone Interference.Figure 1-7. Single-tone interference test, block diagram.Performing the test.Figure 1-8. Single-tone interference data sheet, sample.Figure 1-9. C-message weighting curve.Maximum Change in Audio Frequency.Recording of test data.Figure 1-11. Maximum change in audio-frequency data sheet, sample.Terminal Impedance.Test arrangement.Figure 1-12. Terminal impedance tests, block diagram.Performing the tests.Figure 1-13. Terminal impedance data sheet sample.Output circuit terminal impedance.Longitudinal Balance.Recording of test data.Performing the tests.Output circuit.Figure 1-16. Longitudinal balance data sheet, sample.Phase Jitter.Test arrangements.Figure 1-17. Typical phase jitter test arrangement, block diagramFigure 1-18. Effect of phase jitter on lissajous pattern oscilloscope display.Figure 1-19. Phase jitter data sheet, sample.Performing the test.Study ExercisesStudy Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Lesson 2. Equalizing ProceduresEnvelope-Delay Distortion.Definitions.Figure 2-1. Envelope-delay-distortion test, block diagram.Performing the test, end-to-end method.Calculating relative delays.Calibration and adjustment of controls.Figure 2-2. Envelope-delay-distortion data sheet, sample.Preparation.Amplitude-Frequency Response.Test arrangement.Figure 2-3. Frequency response test, block diagram.Performing the test.Figure 2-4. Frequency response data sheet, sample.Equalizing.Equalizer used.Correcting delay distortion.Figure 2-6. Typical delay characteristics of individual sections.Correcting amplitude distortion.Study ExercisesStudy Exercises (Cont)Study Exercises (Cont)Figure 2-7. Graph of delay limits in parameter S3.Study Exercises (Cont)Study Exercises (Cont)Figure 2-8. Graph of loss variation in parameter S3.Study Exercises (Cont)Study Exercises (Cont)Study Exercises (Cont)Lesson 3. Record KeepingRecord Filing System.Practical value of records.Figure 3-1. Circuit history file.Equipment utilization recordsFigure 3-2. Equipment utilization record, sample.A nonformatted reportNumbering.Quality Control.Table I. Circuit Quality Control Test ScheduleParameter information.Figure 3-3. Circuit Parameter Test Report, Sample.Table II. Index of Test DescriptionTable II. Index of Test Description (cont)Study ExercisesStudy Exercises (cont)Study Exercises (cont)Study Exercises (cont)Study Exercises (cont)Solution SheetSolution Sheet (Cont)Solution Sheet (Cont)Solution Sheet (Cont)Solution Sheet (Cont)Solution Sheet (Cont)
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