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- Suppose you are located 180 in from a radio transmitter. (a) How many wavelengths are you from the transmitter if the station calls itself 1150 AM? (The AM band frequencies are in kilohertz.) (b) What if this station is 98.1 FM? (The FM band frequencies are in megahertz.)AM radio waves can be produced by a marconi anthenna, whose length must be one-fourth of the wave's wavelength. What must be the length, in meters, of the antenna to produce a frquency of 630kHz?A0.5 MHz antenna carried by an airplane flying over the ocean surface generates a wave that approaches the water surface in the forme a normally incident plane wave with an electric-field amplitude of 5500 V/m. Seawater is characterized by a dielectric constant of 72, relative permeabity of 1 and conductivity of 4 Slm. The plane is trying to communicate a message to a submarine submerged at a depth d below the water surface. If the submarine's receiver requires a minimum signal ampitude of 0.03 u Vim), what is the maximum depth d to which successful communication is still possible? Answer
- Estimate how long an AM antenna would have to be if it were (a) A or (b)A. AM radio is roughly 1 MHz (530 kHz to 1.7 MHz).The AM radio band in a particular area has a frequency range of 554 kHz to 1620 kHz. How long is the wavelength of the radiation at the beginning of the range and how long is the wavelength of the radiation at the end of the range? Answer in units of m.In the U.S., two different frequency ranges are allocated for over-the-air radio broadcast: the AM radio band, in the range 540-1600 kHz, and the FM radio band, in the range 88-108 MHz. (a) Find the longest and shortest wavelengths (in m) in the AM band. longest m shortest (b) Find the longest and shortest wavelength (in m) in the FM band. longest m shortest Need Help? Read It
- Suppose a (radio) dish antenna has a diameter of 100m (as e.g. an antenna that exists close to Bonn, Germany). If this antenna receives a radio signal with an electric field of 1µV /m and a magnetic field of 3.3 × 10−15T what is the power received by the antenna if it absorbs all the energy?An Electromagnetic wave of v = 5 MHz passes from vacuum into the dielectric medium with permittivity E, = 4, then: The wavelength is doubled and the frequency becomes half The wavelength and frequency both remain unchanged The wavelength is halved and the frequency remains unchanged The wavelength is doubled and the frequency is halved(a) What would a small T.V. antenna suggest about the broadcast signal it is designed to receive?(b) A radio station in Sydney broadcasts at 9.67 MHz. What would be the length of its antenna if this is exactly half a wavelength long?
- A radio station utilizes frequencies between commercial AM and FM. What is the frequency of a 11.12-m-wavelength channel?(a) A center-fed dipole with a z-directed current has electrical length L/A=0.075, show that the current distribution may be assumed to be triangular in form. Then find its directivity and radiation resistance. (b) Draw the current distribution for 1.52 length dipole antenna also find the radiation pattern for this antenna and tell about the HPBW of this antenna. Explain Why the /2 Dipole is the Most Popular antenna Dipole, write your answers by giving at least four different comments.The electric field from a radio station some distance from the transmitter is given by (10-4 N/C) cos 106t, where t is in seconds. 1) (a) What peak voltage is picked up on a 86 cm wire oriented parallel with the electric field direction? µV 2) (b) What maximum voltage can be induced in a loop of radius 13 cm? nV