What does an output amplitude modulation (AM) consist of? Carrier Only. One sideband. One sideband and one carrier. Two sidebands and one carrier. Which statement is true of single side band (SSB) emissions? Intelligence is contained in the carrier. Carrier is reinserted in the outgoing signal. Carrier is eliminated in the outgoing signal. Sidebands are eliminated in the outgoing signal. What type of modulation is defined as the modulation of the carrier by a series of pulses? Pulse. Amplitude. Frequency Division. Amplitude modulation (AM) equivalent. In pulse code modulation, what is used to indicate the standard value of the quantized wave? Frequency deviation. Series of coded pulses. Series of frequency burst. Change in amplitude of the signal. What provides the magnetic field in a dynamic loudspeaker? An electrical charge. A permanent magnet. Two coils at a 5:1 ratio. Two coils at a 10:1 ratio. To achieve good tone quality, speakers must have superior iron cores. highquality fames. air-tight construction. a good frequency response. Which component in an amplitude modulation (AM) transmitter is used to increase the power of a radio frequency (RF) signal to the value diesired to be radiated? Driver. Buffer amplifier. Frequency multiplier. Final power amplifier. Intergral multiple of fundamental frequencies are called sidebands. harmonics. oscillations. center frequencies. Which component in an amplitude modulated (AM) transmitter generates the radio frequency (RF) carrier wave? Driver. Buffer. RF section. Oscillator. The ability of a reciever to intercept weak signals and extract the intelligence is called sensitivity. selectivity. selection. fidelity. The ability of a reciever to intercept a desired signal and extract its intelligence while exluding other signals is called fidelity. sensitivity. selectivity. frequency coverage. In an amplitude modulated (AM) reciever, where is the intelligence recovered from the modulated wave? Mixer. Buffer. Detector. Intermediate frequency (IF) amplifier. Which is not an advantage of a single side band (SSB) over amplitude modulated (AM) transmission? Power efficiency Frequency stability. Signal to noise (S/N) ration. Spectrum conservation. In a single side band (SSB) transmitter, which circuit produced the sidebands? Detector. Discriminator. Band producer. Balanced modulator. WHich single side band (SSB) reciever stages are used to perform functions similar to the second detector stage in an amplitude modulation (AM) reciever? Isolator and detector. Mixter and beat frequency oscillator. Detector and volatage controlled oscillator. Sideband filter and voltage controlled oscillator. In frequency modulated (FM) communications, which term identifies the action of changing frequency? Frequency deviation. Frequency modulation. Bandwidth distribution Modulating index alteration. What happens to the total power of a frequency modulation (FM) signal when modulation increases? It doubles. It remains constant. Total power decreases. Total power increases. Variation of oscillator frequency in accordance with an audio signal we call frequency modulation (FM). amplitude modulation (AM). single side band (SSB) modulation. double side band (DSB) modulation. Which stage in a frequency modulation (FM) reciever increases sensitivity? Buffer Oscillator. Radio frequency (RF) amplifier Independent frequency (IF) amplifier In a frequency modluated (FM) receiver, which circuit is used to eliminate the undesired amplitude variations in the FM signal? Second mixer. Discriminator. Preselector. Limiter. Which device is used to conduct energy from the transmitter to the load? Splitter. Power amplifier (PA). Transmission line. Long-wire antenna. What happens to the energy applied to a transmission line if the load impedance is the same as the line's impedance? No energy is felt at the load. Maximum standing wave ratio (SWR) will be detected. The load absorbs all applied energy. Exactly one half of the energy will be absorbed. What is produced when applied and reflected waves combine on a transmission line? Harmonics. Standing waves. Multiple signals. Maximum transmitter output. Most of our radio systems are within tolerance when the forward and reflected power ratio is 2:1 or less. 5:1 or less. 10:1 or less 20:1 or less. The property of interchangeability of the same antenna for both transmitting and receiving operations is known as characteristic impedance matching. radiation maximization. maximizing efficiency. antenna reciprocity. An antenna which is said to waste very little energy can propagate a broad band of frequencies. produces a higher amplitude signal has high gain. is efficient. Which field at an antenna becomes detached and travels through space? Magnetic Indution Radiation. Electromagnetic. An antenna which is a multiple of one half wavelength acts as a reactive circuit. resonant circuit. resistive circuit. conductive circuit. Which type of anetnna radiates more energy in one direction than another? Anisotropic. Isotropic. Half-wave. Full-wave. Which atmosphereic layer is closest to earth? Stratosphere. Troposphere. Ionosphere. Hemisphere. Which types of waves are used for long-distance transmissions? Skywaves. Direct waves. Ground waves. Tropospheric waves. Radio waves that move upward and outward and are not in contact with the ground are skywaves. direct waves. reflected waves. tropospheric waves. WHen are all four layers of the ionosphere present? Daytime. Nighttime. During high sunspot activity. During high solar flare activity. Which layer of the ionosphere completely absorbs low- and medium-frequency radio waves? D. E. F1. F2. Which type of waves are the most reliable? Skywaves. Ground waves. Incident waves. Multihop waves. Which ionospheric layer is the highest? D. E. F1. F2. What is the term we use to describe the area between the maximum range of a ground wave and where the skywave returns to earth? low incident area. weak signal area. cone of silence. skip zone. What is the average maximum skip distance for a skywave transmitted from an antenna located o nthe ground and reflected from the F2 layer? 1,500 miles. 2,500 miles. 4,000 miles. 5,000 miles. How can we tranmit skywave signals half-way around the earth? By using very low frequencies. By using multihop transmissions. By using very high transmitter power. Skywave signals cannot travel this far. When is skip fading most common? Daytime. Nightime. Sunrise and senset. When traveling near the euator. Which test equipment would you use to measure the power output of a transmitter? Ohm meter. Milliammeter. Thru-line wattmeter. Time-domain reflectometer (TDR). One of the disadvantges of using a volt-ohm-milliameter is that it overheats. loses polarity. loads the circuit. varies with frequency. Which type of test equipment is best suited to making voltage checks in sensitive circuits? Wattmeter. Spectrum analyzer. Analog mulimeter. Digital multimeter. Which is an advantage of a digital multimeters over analog mulimeters? lower cost. more selctivity. greater scale deflection. greater input impedances. A power meter that measures power directly is connected in series between a transmitter and load. in parallel between a transmitter and load. at the input and output of the system under test. at the input and output of the component under test. When using a thru-line wattmeter, how do you determine the power range and frequency band? By the model of meter. By range switch settings. By selection of plug-in elements. By placement of a termination device. The time-domain reflectometer (TDR) is used to test transmission lines because it is sensitive to reflected waves. impedance changes. long length of cable different types of voltages. Any change in the impedance of the cable is reflected back to the time-domain reflectometer (TDR) and is known as a reflected pulse. an incident wave. a signal trace. a standing wave ratio (SWR). How is intensity information provided on the oscilloscope? By bias control. By input deflection. Through internal betteries. Through external connections. What position of the input coupling switch on the oscilloscope allows you to view both direct current (DC) and alternating current (AC) components of the input signal? AC. DC. GND. 50 Ohm. Which test instrument is used to show the distribution of energy contained in the frequencies eimitted by a transmitter? Wattmeter. Multimeter. Spectrum analyzer. Time-domain reflectometer (TDR). How are signal generators classified? By size. By output power. According to frequency. According to strength. How are wiring diagram technical order (TO) page numbers identified in the table of contents? By using the equipment number. By using the effectivity number. By using the diagram number. Bold numbers. Which troubleshooting method is very effective when working on wiring problems? Loop back. Half split. Stair step. Continuity. Which type of connector is installed on oxygen-related equipment? U-91A/U. U-92A/U. U-93A/U. U-94A/U. What could happen if two conflicting radio frequencies (RF) are used at the same time on your aircraft? It may cause internal interference. One or both radios may be unusable. The radio using the lower frequency may be distorted. The radios could get louder when receiving at the same time. Outside of frequency conflicts, what is the most likely cause of internal interference? Electromagnetic pulse (EMP) shielding. antenna proximity. Loose or damaged coaxial connections. Signal strength of transmitting systems. What term do we use to identify components of aircraft and mission equipment in which sensitivity to nuclear weapons effects could reduce system survivability? Nuclear protected. Nuclear sensitive. Hardness critical. Detonation survivable. -- END 2-53 --