Description : What type of antenna has all elements connected to the same energy source?
Last Answer : Driven Array.
Description : What type of transmission line is often used to connect a television set to its antenna?
Last Answer : Twin lead.
Description : What composite field (composed of E and H fields) is found stored in the antenna?
Last Answer : Induction field.
Description : Which two composite fields (composed of E and H fields) are associated with every antenna?
Last Answer : Induction field and radiation field.
Description : If a transmitting antenna is placed close to the ground, how should the antenna be polarized to give the greatest signal strength?
Last Answer : Vertically polarized.
Description : The power gain of an antenna is directly related to what other antenna property?
Last Answer : Directivity.
Description : What radar component permits the use of a single antenna for both transmitting and receiving?
Last Answer : Duplexer.
Description : What is the result of an impedance mismatch between a receiver or transmitter and its transmission line or antenna?
Last Answer : High vswr, which equates to poor reception or a loss of power output.
Description : All the power sent down a transmission line from a transmitter can be transferred to an antenna under what optimum conditions?
Last Answer : When the characteristic impedance of the transmission line and the load impedance are equal.
Description : What term is used for the end of the transmission line that is connected to an antenna?
Last Answer : Output end, receiving end, load end and sink.
Description : What connecting link is used to transfer energy from a radio transmitter to its antenna located on
Last Answer : Transmission line.
Description : What determines the beam elevation angle of an antenna that is electronically scanned in elevation?
Last Answer : Frequency or phase of radiated energy.
Description : A horizontally truncated paraboloid antenna is used for what purpose?
Last Answer : Determine elevation.
Description : What characteristic allows the same antenna to both transmit and receive?
Last Answer : Reciprocity.
Description : What is the term that is used to describe narrowness in the radiated beam of an antenna?
Last Answer : Antenna directivity.
Description : What type of antenna radiates in and receives energy from all directions at once?
Last Answer : Omnidirectional.
Description : What term is used to express the efficiency of an antenna?
Last Answer : Power gain or power ratio
Description : What precautions must be taken when sweeping a transmitting antenna?
Last Answer : You must ensure that power induced from any adjacent transmitting antennas does not damage your test equipment.
Description : What is the purpose of an antenna coupler
Last Answer : It matches the impedance of an antenna to that of a transmission line at any desired frequency.
Description : What is the function of an antenna patch panel?
Last Answer : To connect an antenna/transmission line to a receiver/transmitter.
Description : What is the radiation pattern of a quarter-wave antenna?
Last Answer : A circular radiation pattern in the horizontal plane, or same as a half wave.
Description : What is the simplest method of feeding power to the half wave antenna?
Last Answer : To connect one end through a capacitor to the final output stage of the transmitter.
Description : In which plane will the half-wave antenna be operating if it is mounted horizontally?
Last Answer : Vertical plane.
Description : . If a basic half-wave antenna is mounted vertically, what type of radiation pattern will be produced?
Last Answer : Nondirectional.
Description : The Yagi antenna is an example of what type of array?
Last Answer : Multielement parasitic array.
Description : What is the primary reason for the development of the turnstile antenna?
Last Answer : For omnidirectional vhf communications.
Description : What is the main disadvantage of the rhombic antenna?
Last Answer : It requires a large antenna site.
Description : What is the polarity of the currents that feed the V antenna?
Last Answer : Opposite.
Description : What is another name for the Beverage antenna?
Last Answer : Wave antenna.
Description : To radiate power efficiently, a long-wire antenna must have what minimum overall length?
Last Answer : One-half wavelength.
Description : The parasitic array can be rotated to receive or transmit in different directions. What is the name given to such an antenna?
Last Answer : Rotary array.
Description : What is the purpose of antenna stubs?
Last Answer : To produce desired phase relationship between connected elements.
Description : What is the radiation resistance of a half-wave antenna in free space?
Last Answer : 73 ohms.
Description : What type of polarization should be used if an antenna is mounted on a moving vehicle at frequencies below 50 megahertz?
Last Answer : Vertical polarization.
Description : The various properties of a transmitting antenna can apply equally to the same antenna when it is used as a receiving antenna. What term is used for this property?
Last Answer : Reciprocity of antennas.
Description : What is the term used to identify the points of minimum current and minimum voltage on an antenna?
Last Answer : Current and voltage nodes.
Description : What is the term used to identify the points of high current and high voltage on an antenna?
Last Answer : Current and voltage loops.
Description : What three factors determine the type, size, and shape of an antenna?
Last Answer : Frequency of operation of the transmitter, amount of power to be radiated, and general direction of the receiving set.
Description : What are the three parts of a complete antenna system?
Last Answer : Coupling device, feeder, and antenna.
Description : What type of amplifier would be used to amplify the signal from a radio antenna?
Last Answer : An rf voltage amplifier.
Description : If the current ratios of the two or more elements must be held 5% and the phase angle to 3° the antenna is called a A. end fire array B. critical phased array C. broadband array D. wideband array
Last Answer : B. critical phased array
Description : Stacking antenna elements A. increases sensitivity to weak signals B. will suppress odd harmonics C. decrease signal to noise ratio D. increases selectivity
Last Answer : A. increases sensitivity to weak signals
Description : The effect of adding parasitic elements of a Hertz dipole is to A. make the antenna more omnidirectional B. reduce its resonant frequency C. increase the antenna’s power gain D. All of these
Last Answer : C. increase the antenna’s power gain
Description : What is antenna bandwidth? A. Antenna length divided by the number of elements B. The angle between the half-power radiation points C. The angle formed between two imaginary lines drawn through D. The frequency range over which an antenna can be expected to operate satisfactorily
Last Answer : D. The frequency range over which an antenna can be expected to operate satisfactorily
Description : The purpose of stacking elements on an antenna. A. Sharper directional pattern B. increased gain C. Improved bandpass D. All of these
Last Answer : D. All of these
Description : In order to get maximum radiation to all surrounding points in the horizontal plane, the antenna used is a A. vertical loop B. vertical quarter-wavelength rod C. array which includes parasitic elements D. a horizontal Hertz dipole
Last Answer : B. vertical quarter-wavelength rod
Description : Stacking elements in a transmitting antenna system A. increases the field strength at the receiving antenna B. increases the directivity of the transmitter antenna C. decrease the size of the lobe in the radiation pattern D. both A and B
Last Answer : D. both A and B
Description : What circuit is responsible in activating and deactivating adjacent antenna elements in a mobile satellite array? A. Radial divider B. Divider/combiner C. Radial combiner D. Radial multiplexer
Last Answer : A. Radial divider
Description : In a typical mobile satellite array antenna if three elements are activated, how many elements are deactivated? A. 3 B. 11 C. 5 D. 9
Last Answer : B. 11
Description : What is meant by the term radiation resistance for an antenna? A. The resistance in the trap coils to received signal B. An equivalent resistance that would dissipate the same amount of power as ... antenna C. The specific impedance of the antenna D. Losses in the antenna elements and feed line
Last Answer : B. An equivalent resistance that would dissipate the same amount of power as that radiated from an antenna