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37 Cards in this Set
- Front
- Back
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What is one reason for modulation that involves modulating low frequency signals for transmission over long distances |
Ease of radiation |
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What are the three General categories used to produce modulation in radio frequency Transmissions today |
Amplitude, frequency, and phase |
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When the modulating signal and carrier signal are combined with the modulator the output signal contain |
Carrier, upper side band, and lower sideband |
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If a carrier frequency of 1 megahertz in a modulating tone of 10 kilohertz goes to the modulator that output signal includes |
1.01 megahertz, 1 megahertz, and 0.99 megahertz |
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The bandwidth of an amplitude modulated signal is |
2 times the modulating signal |
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Is the formula on page 1 - 3. If an oscilloscope displays modulation envelope having Emax of 200 volts Emin of 20 volts what is the modulation percentage |
81.8 |
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What is true concerning bandwidth |
Over modulating increases been with because the Distortion produces harmonics |
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The output of the oscillator in a frequency modulation modulator increases in frequency with each |
Positive half cycle of the carrier |
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In frequency modulation of significant sideband contains at least what percentage of the total transmitted power |
1 |
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What is the formula to find modulating index |
Deviation divided by frequency of modulation |
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5 kilohertz modulating signal has enough Peak voltage to cause deviation of 15 kilohertz. What is the modulation index |
3 |
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What is it called when a frequency band between adjacent stations prevent frequency modulated sidebands from overlapping |
Guard band |
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In Phase modulation what part of the carrier signal is varied |
Phase |
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Phase modulation the carriers |
Phases shifted at the rate of the modulating signal |
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What part of the pulse code modulation process converts a continuous time signal into a discrete time signal |
Sampling |
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Asynchronous transmission what bit is used by the receiving device to verify transmission was received correctly |
Parity |
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If an error should occur what transmission is lost in a synchronous transmission |
Block of data |
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When using vertical redundancy check what significant does the amount of one's have in a data bit pattern |
Determines parity |
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What error detection method is used for checking a data block greater than 512 and about 99 percent effective in most applications |
Cycle redundancy check |
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When using forward error control as a method of error correction where does the error correction take place |
Receiving end |
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White horses that are applicable to fiber optic waveguide are light-emitting diodes and |
Semiconductor laser diodes |
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What type of light is emitted from a laser |
Coherent |
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What are the two main types of photo detectors |
Positive intrinsic negative and Avalanche photodiode |
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What photo detector converts one Photon to one electron |
Positive intrinsic negative diode |
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Which repeater amplifies Optical signal without converting to and from the electrical domain |
Optical amplifiers |
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A short section of single fiber cable that has a connector on each end is called a |
Patch cord |
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Which fiber optic connector uses quick-release keyed bayonet couplings that are preferred in situations where severe vibrations are not expected |
Straight tip |
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High altitude electromagnetic pulse is a wideband phenomenon that involves which frequency range |
1 Hertz - 1 gigahertz |
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High altitude electromagnetic pulse environment protection is important for critical time urgent mission systems because it |
Is the only nuclear environment that may be imposed on many systems simultaneously with the expenditure of very few weapons |
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The system generated electromagnetic pulse is a problem for satellites and reentry vehicles that are |
Directly exposed to nuclear radiation from a high altitude burst |
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Which distinct region of the source region electromagnetic pulse is produced by interactions between the weapons products and Earth's atmosphere |
Source |
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Atmospheric disturbances from initial nuclear radiation on higher frequencies affect |
Scintillation effects |
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Current and voltage is induced on power lines, cable links, and pipelines by electromagnetic pulses are called |
Longline effects |
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which type of filters are always use in combination with surgery arrestors |
Linear |
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If the interference can be eliminated by disconnecting the receiving antenna the source of the disturbance is most likely |
External to the radio |
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Little or no variations in the strength of the interfering signal when moving the receiving antenna for short-distance normally indicates |
Enemy jamming |
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what type of electromagnetic interference occurs when a receiver to off frequency signals |
Spurious responses |
