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Army Communication Systems Telephone System CharacteristicsTelephone System CharacteristicsSignal Subcourse 333 Telephone System CharacteristicsIntroductionLesson ObjectivesImpairments to Telephonic CommunicationDisturbing Effect of Noise.Line Circuit WeightingAmplitude-Frequency DistortionLoading and Data Transmission.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Lesson 1: Network Losses and GainsInstrumentation.Table 1. Power, Voltage, and Current RatiosAbsolute vs Relative LevelsFigure 2-1. Approximate power levels.Table 2. Voltage VariationCircuit DescriptionFigure 2-3. Transmission level diagram.Figure 2-4. Loss-gain characteristic.Using the TLP.Circuit AdjustmentsCalculations of Noise Levels.The Military Transmission PlanTypes of Circuits. Figure 2-5. Types of circuits in a telephone network.Figure 2-6. Transmission level diagram of LD trunk.Study Exercises-cont.Figure 2-7. Schematic diagram of a line terminating circuit.Study Exercises-cont.Figure 2-8. Partial transmission level diagram.Study Exercises-cont.Lesson 3: Echo Suppressors and CompandorsTelephone NetworksFigure 3-1. Hybrid coil directs traffic through repeaters.Echo SuppressorEcho Suppressor PrinciplesCompandorFigure 3-4. Compandor in a telephone communications circuit.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Lesson 4: EqualizationAnalog Signal Distortions.Frequency distortion. Amplitude-Frequency EqualizerFigure 4-2. Amplitude-frequency equalizer, simplified schematic diagram.Combination EqualizersDelay Characteristics-cont.Block Diagram.Equalization ProcedureApplication of EqualizersFigure 4-6. Application of equalizers to telephone carrier terminal.Future DevelopmentsStudy Exercises-cont.Figure 4-7. Delay equalized circuit characteristics.Study Exercises-cont.Study Exercises-cont.Extension Course of the Us Army Signal SchoolExtension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Blank Page
Army Communication Systems
Telephone System CharacteristicsTelephone System CharacteristicsSignal Subcourse 333 Telephone System CharacteristicsIntroductionLesson ObjectivesImpairments to Telephonic CommunicationDisturbing Effect of Noise.Line Circuit WeightingAmplitude-Frequency DistortionLoading and Data Transmission.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Lesson 1: Network Losses and GainsInstrumentation.Table 1. Power, Voltage, and Current RatiosAbsolute vs Relative LevelsFigure 2-1. Approximate power levels.Table 2. Voltage VariationCircuit DescriptionFigure 2-3. Transmission level diagram.Figure 2-4. Loss-gain characteristic.Using the TLP.Circuit AdjustmentsCalculations of Noise Levels.The Military Transmission PlanTypes of Circuits. Figure 2-5. Types of circuits in a telephone network.Figure 2-6. Transmission level diagram of LD trunk.Study Exercises-cont.Figure 2-7. Schematic diagram of a line terminating circuit.Study Exercises-cont.Figure 2-8. Partial transmission level diagram.Study Exercises-cont.Lesson 3: Echo Suppressors and CompandorsTelephone NetworksFigure 3-1. Hybrid coil directs traffic through repeaters.Echo SuppressorEcho Suppressor PrinciplesCompandorFigure 3-4. Compandor in a telephone communications circuit.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Study Exercises-cont.Lesson 4: EqualizationAnalog Signal Distortions.Frequency distortion. Amplitude-Frequency EqualizerFigure 4-2. Amplitude-frequency equalizer, simplified schematic diagram.Combination EqualizersDelay Characteristics-cont.Block Diagram.Equalization ProcedureApplication of EqualizersFigure 4-6. Application of equalizers to telephone carrier terminal.Future DevelopmentsStudy Exercises-cont.Figure 4-7. Delay equalized circuit characteristics.Study Exercises-cont.Study Exercises-cont.Extension Course of the Us Army Signal SchoolExtension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Extension Course of the Us Army Signal School-cont.Blank Page
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