2. At a certain time, the MUF for transmissions at an angle of incidence of 750 is 17 MHz. what the critical frequency?
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- 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)Show that the directivity of isotropic antenna is 1.Calculate the directivity of an isotropic antenna.
- If you check the voltage at one-half wavelength from the end of an RF transmission line, what voltage would you measure? A. Peak B. Infinite C. Minimum D. ZeroIf the FNBW of a parabolic reflector antenna is 15o at 1.5 GHz then estimate the diameter of the antenna.Calculate the power density 25 km away from a 90% efficient half-wave dipole if the transmit power is 125 W.
- An isotropic antenna is radiating evenly in the r–direction in free space. The totalelectric field (E0) is 20 V/m at 1-m distance. Determine the following parameters at adistance of 139 m from the antenna. (iii)Find The total radiated power.A parabolic antenna having a circular aperture mouth has a power gain of 1000 for wavelength of 10 cm. What will be the diameter of the aperture?An antenna used for transmitting has a power gain of 20, directive gain of 22, and an input power of 200 W. Determine: 1.EIRP in W, dBm and dBW. 2.Power density at a distance of 5 km from the antenna along the direction of maximum radiation. 3.Antenna efficiency 4. Radiated power from an antenna 5.Radiation resistance and antenna effective resistance if current at feedpoint is 2 A.
- If the directivity of an antenna is 12.5 dB when the antenna is transmitting at 5 nm wavelength, then what will be the effective aperture of the antenna?A horn antenna is operated 8.2 to 12. 4 GHz. The aperture of the antenna is (L x W ) 32 x 42 mm. Determine: a) Reactive near-field region at 8.2 GHz and at 12.4 GHzb) Far-field region at 8.2 GHz and at 12.4 GHzAn antenna transmits 24.5W and has a gain of 16.8dB. What is the power density at a distance of 323 meters in the maximum radiation direction?