12. Determine the optimum frequency of operation of an antenna if it has -3 dB frequencies of 350 MHz and 560 MHz and percent bandwidth of 51.2195%. * O 420 MHz 410 MHz 400 MHz O 390 Mhz 13. Compute for the receive power gain given that the frequency of operation is 750 MHz and capture area is 0.8 m^2. * 20 O None of the choices O 30 pi O 17.9818 dB

12. Determine the optimum frequency of operation of an antenna if it has -3 dB frequencies of 350 MHz and 560 MHz and percent bandwidth of 51.2195%. * O 420 MHz 410 MHz 400 MHz O 390 Mhz 13. Compute for the receive power gain given that the frequency of operation is 750 MHz and capture area is 0.8 m^2. * 20 O None of the choices O 30 pi O 17.9818 dB

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The radio path (f = 900 MHz) between a mobile phone and the base station has a loss of 30 dB in addition to the free space loss. The base station measures the level of the signal transmitted by the phone, and it sends the phone a command to set the transmit power to a level, which gives a received power level of-90 dBm. The antenna gain of the phone is 2 dB and the receive gain of the base station antenna is 7 dB. The distance between the phone and the base station is 500 m. What will be the transmit power level of the phone?
Q. A base stationcellular communicationsystems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm2 ) at a distance of 100 meters? This will determine the safe level for human exposure to electromagnetic radiation.
Please show all steps A parabolic dish antenna has a diameter of 5 meter, operating at 30 GHz frequency.a) What is the effective area Ae of the antenna? b) What is the antenna power gain in ratio and in dBi?
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2. Engineers plan to use a 2 x 10^9 Hz link with a 300 Hz bandwidth to communicate with a remote sensing spacecraft in an orbit at 400 Km altitude. The transmitter-antenna gain is 300 and the receiver-antenna diameter is 30 m. Transmitter power will be 13 W. If the receiver temperature is 300 K, compute the signal-to-noise ratio for the uplink signal. (Note: Use an antenna efficiency of .65 and assume you are directly beneath the satellite.) a) Will this be an effective link? b) Calculate the transmitter antenna diameter. c) Will this be an effective link for a Geostationary satellite?
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A mobile phone antenna with a gain of 2 dB transmits a 0.5 W signal to a base station with an antenna gain of 8 dB. Assume the minimum sensitivity of the receiving antenna to be Pr = -110 dBm. If the operating frequency is 700 MHz, what is the maximum allowed distance between the base station and the mobile phone?.
2.) The power density is 4 mW/m² at some distance R from an isotropic antenna. The isotropic antenna is replaced with a different antenna and the power density measured is now 60 mW/m² at the same distance R. What is the gain (in dB) of the second antenna? 3.) The received power at an airplane is calculated as Pr=-43 dBm at a range of 13 miles using free-space propagation. Determine the received power (in dBm) at a range of 52 miles.
The transmitter and receiver antennas used in a long range microwave communication system operating at 9 GHz are identical and separated by 10km from each other. The receiver power must be at least 10*10-6 W to meet the receiver's signal to noise ratio. Assuming that both antennas are aligned for maximum reception and are polarization compatible, what should be the gain of the transmit and receive antennas in dB when the input power of the transmitter antenna is 10W
1. A 1500-kHz carrier and kHz intelligence signal are combined in a nonlin-ear device. List all the frequency components produced. *2. If a 1500-kHz radio wave is modulated by a 2-kHz sine-wave tone, what frequencies are contained in the modulated wave (the actual AM signal)? *3. If a carrier is amplitude-modulated, what causes the sideband frequencies? *4. What determines the bandwidth of emission for an AM transmission? *10. What are some of the possible results of overmodulation? *11. An unmodulated carrier is 300 V p-p. Calculate %m when its maximum p-p value reaches 400, 500, and 600 V. (33.3%, 66.7%, 100%) 12. If V and V as shown in Figure 8, determine %m. (53.85%) 13. Determine and from Problem 12. ( Vpk, Vpk)
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