0195136047.pdf

734 COMMUNICATION SYSTEMS (a) Now consider a typical open-wire transmis- sion line with parameters ofR= 14 /mi, L=4.6 mH/mi,C=0 ...

PROBLEMS 735 15.1.27An antenna has an aperture area of 10 m^2 ,an aperture efficiency of 0.6, and negligible losses. If it is us ...

736 COMMUNICATION SYSTEMS identical paraboloidal antennas with pencil beam- width of 1°, aperture efficiency of 0.8, and radi- a ...

PROBLEMS 737 *15.2.6In a standard AM system, represented by Equation (15.2.3),Ac=200 V, ∣ ∣∣f (^2) (t) ∣ ∣∣^1 /^2 =50 V, and Z ̄ ...

738 COMMUNICATION SYSTEMS M(f) −10,000 10,000 f Figure P15.2.16 15.2.19An FM station’s modulator has a sensitivitykFM= 5 π× 104 ...

PROBLEMS 739 m(t) − 1 − 5 5 (^012)... ... t Figure P15.2.28 m(t) − 1 − 2 2 1 134526 t Figure P15.2.29 15.2.30An angle-modulated ...

740 COMMUNICATION SYSTEMS u(t) L C 10 kΩ m(t) Envelope detector Figure P15.2.32 Equation (15.2.13) for wide-band FM iff ≥ 2 W). ...

PROBLEMS 741 the initial value of the output be 1. Also, show the schematic representation of the required decoder in the receiv ...

742 COMMUNICATION SYSTEMS whereSˆi/Niis the ratio of the power in the signal peak amplitude (at the integrator output at the sam ...

PROBLEMS 743 15.3.19By a simple time multiplexing of natural samples over a single line, a large radar site transmits 85 analog ...

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PART CONTROL SYSTEMS FIVE ...

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16 Basic Control Systems 16.1 Power Semiconductor-Controlled Drives 16.2 Feedback Control Systems 16.3 Digital Control Systems 1 ...

748 BASIC CONTROL SYSTEMS is essential to every engineer involved in the understanding of the dynamic behavior of various system ...

16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 749 Source Power semiconductor converter Motor Sensing unit Control unit Command sign ...

750 BASIC CONTROL SYSTEMS 0 Maximum continous torque Maximum transient torque Maximum continuous power Maximum transient power I ...

16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 751 TABLE 16.1.1Converters and Their Functions for the Control of Motors Converter Co ...

752 BASIC CONTROL SYSTEMS TABLE 16.1.3Symbols andv–iCharacteristics of Some Power Semiconductor Devices Diode AK AK VD VG ID Dev ...

16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 753 + VG Vs Vs t t vo vG R vo Thyristor (a) − 1 1 − + + − − + VG Vs Vs t t vo t 1 T t ...