PROBLEM 3: A radio signal of 60 MHz frequency is being transmitted by a transmitter with 1 kW output power. The field strength from transmitting antenna is 2.5 times as that of half wave antenna. The height of the transmitting and receiving antennas are 50 m and 5 m respectively. If minimum field strength required at the receiving antenna is 80 µV/m then calculate the distance between transmitter and receiver.
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- 21. A radio system transmits a 2.4GHz signal at 250mW over a distance of 20m through two antennae with a combined gain of 10dBi. If the noise level is 0.05µW, and the bandwidth of the channel is 250kHz, what is the theoretical maximum capacity of the system?28. For the ladder network in Fig. 7.91 O: a. Determine R7. b. Calculate I. c. Find the power delivered to R; R1 R3 R6 RT 42 4 N 4 N 40 V = R2 R4 R7 :2Ω R5 Rg IN Fig. 7.91 Problem 28.13. For each network in Fig. 5.100 O, constructed of standard values, determine: a. The current I. b. The source voltage E. c. The unknown resistance. d. The voltage across each element. - E + 4.7 + 130 5.2 V 3.3 k :2.2 kn 6.6 V R7=90 R R - 9 V + (1) (II) Fig. 5.100 Problem 13.
- 6. For the network of Fig. 8.69: (a) Determine re. (b) Calculate VB and Vc. (c) Determine Z¡ and A, = V,/V¡. Vcc = 20 V 6.8 k2 220 kΩ Vc Vo Сс VB V; o Cc B = 180 ro = 50 kQ Z; 56 k2 2.2 kQ CE HE1-17. (a) For a satellite transmitter operating at 20 GHz, a circular-aperture antenna with a two- degree beamwidth is desired. The aperture efficiency is 65%. What should the antenna diameter be to achieve this beamwidth? What is the corresponding gain? (b) Find the diameter of an antenna that will provide a 150-mile diameter spot at the equa- tor within the 3 dB beamwidth if the platform on which the antenna is mounted is a geostationary-orbit satellite. Assume the operating frequency and efficiency of part (a). What is the gain of the antenna? (Geostationary altitude is 35,784 km above the earth's equator.)1-10. Coefficients for the aR relationship for rain attenuation are given in the following table for various frequencies: Frequency GHz b a 12 0.0215 1.136 15 0.0368 1.118 20 0.0719 1.097 30 0.1860 1.043 40 0.3620 0.972 Compute the rain attenuation per kilometer for the following combinations of rain rate and carrier frequency: (a) f= 12 GHz; R = 1 mm/h (light rain) (b) S= 40 GHz; R = 1 mm/h (c) f=12 GHz; R = 25 mm/h (heavy rain) (d) f= 40 GHz; R- 25 mm/h (e) f= 20 GHz; R 10 mm/h (moderate rain)
- 2.3. A hypothetical isotropic antenna is radiating in free-space. At a distance of 100 m from the antenna, the total electric field (Eg) is measured to be 5 V/m. Find the (a) power density (Wrad) (b) power radiated (Prad)Q5/ A beam with a length L is attached to the wall with a cable as shown. A load W = 400 lb. is attached to the beam. The tension force, T, in the cable is given by: T=! WL√/h²+x² hx For a beam with L = 120 in and h=50 in calculate T for x = 10, 30, 50, 70, 90, and 110 in.Q3 (32 points) Figure 2 shows a potential function with incident particles coming from -o with a total energy Vị a. Do not solve for the constants of the wave functions (16 points). Incident particles V,M D d T M. P- A circular shaft having diameters D and d and a groove of radius r (with M = 0 and P O) is made of steel with the allowable shear stress tall. Find the maximum torque I that can be transmitted by the shaft. Given: D = 28mm, d = 20mm, r = 4mm, and tall = 250 MPa. Please help with this question. The answer should be 157.1 Nm2.8. The approximate far zone normalized electric field radiated by a resonant linear dipole antenna used in wireless mobile units, positioned symmetrically at the origin along the z- axis, is given by 0° < 0 < 180° 0° <0< 360° E. = â,E, sin!-S ekr where E, is a constant and r is the spherical radial distance measured from the origin of the coordinate system. Determine the: (a) Exact maximum directivity (dimensionless and in dB). (b) Half-power beamwidth (in degrees) (c) Approximate maximum directivity (dimensionless and in dB). Indicate which approxi- mate formula you are using and why? (d) Approximate maximum directivity (dimensionless and in dB) using another approximate formula. Indicate which other formula you are using and why? (e) Maximum directivity (dimensionless and in dB) using the computer program Directivity.8. For the network in Fig. 7.71 O: a. Determine R7. b. Find /, 1, and l2. c. Find voltage Va- R3 10 N 10 Ω R2 15 Ω Va R1 36 V R420 RTSEE MORE QUESTIONS