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- a) A lightning strikes a 30-m unshielded over-head transmission line tower which has the following parameters: Surge impedance of the tower = 100 12 Surge impedance of lightning channel at tower top = 500 12 Tower-footing resistance = 10 12 Tower height = 30 m Cross-arm height = 27 m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 us. The traveling wave propagation speed in the tower is 1.2 x 108 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot. (ii) Determine the time of travel from tower top to tower foot. (iii) Determine the time of travel from cross arm to tower foot. (iv) Draw the voltage lattice diagram with proper labels of the time. (v) Ignoring the phase voltage, determine the insulator voltage after 2 us. The insulator voltage approaches a constant value after 2 us. If the basic impulse insulation level (BIL) of the insulator for phase conductor is 150 kV, evaluate the condition of the insulator and conclude…5 (a) With an aid of a simple diagram explain the construction of a coaxial cable (b) If a load of 50 Ohms terminates a transmission line of impedance 100 Ohms calculate the reflectance and the amplitude of the reflected wave (given a unit amplitude incident wave). Also find the VSWR in this case (c) A 50Ω transmission line is connected to an antenna with load impedance of ZL = (25-j50) Ω. Design a short-circuited parallel stub required to match the lines. (Use a smith chart and upload it along with your answers)Match the load, ZL = 300 + j600 ῼ to the line with Zo = 400 ῼ using a short-circuited shunt stub. If this match is true for a frequency 500 MHz, find the new SWR if frequency is changed to 350 MHz.
- Please I need a 100 % correct answer some websites are answering the questions by using the frequency and some by using the effective aperture An antenna transmits a power of 2W from an antenna of 20db, towards a receiver located 40 km from the receiver, calculate the power received by an antenna of effective antenna 10 m^2 if the operating frequency is 11 KHzSolve for the admittance, Yab, of the circuit shown. (magnitude only)An antenna has an input impedance of 73 + j 10 ohms. If it is directly connected toa 50 ohm transmission line, find the reflection coefficient, VSWR and return loss.
- The effective span of an antenna is 2.147 m2 at an operating frequency of 100MHz. The antenna has no conduction or dielectric loss. The input impedance of the antenna is 75Ω and it is connected to a 50Ω transmission line. Find the directionality of the antenna system. (The term "system" here refers to the effects of binding to the transmission line.) It will be assumed that there is no polarization loss.At a certain time, the maximum usable frequency (MUF) for transmission at an angle of incidence of 75° is 20MHz. A) What is the critical frequency in MHz? (Use two decimal places for the final answer) B) What will be the optimum working frequency (OWF) in MHz? (Use two decimal places for the final answer)Simplified or ideal equivalent circuit representation of transmission line at RF consists of: a. R and C b. R, L, C and G c. Rand G d. Land C Characteristic impedance at RF frequencies is purely: a. conductive b. resistive c. inductive d. capacitive Radiation loss of a transmission line: a. independent of frequency b. increases with frequency c. decreases with frequency d. increases at some frequency range and then decreases with frequency
- At a frequency of 4 MHz a parallel wire transmission line has the following parameters: R = 0.025 Ω/m, L = 2 µH/m, G = 0, C = 5.56 pF/m. The line is 100 meters long, terminated in a resistance of 300 Ω. Find the characteristic impedance, standing wave ratio and voltage reflection coefficient of the load.A 50-mV sinusoid, at a frequency of 1 kHz, is applied to a capacitor microphone FM generator. If the deviation constant for the capacitor microphone FM generator is 500 Hz/20 mV, determine: a. The total frequency deviation. b. The rate at which the carrier frequency is being deviated.The characteristic impedance of a transmission line is 70 ohms and has a load of 35 ohms. The SWR and reflection coefficient are _____ and ______ respectively.