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What characteristic of an audio tone determines the percentage of modulation of an FM broadcast transmitter?
Wiki User
∙ 12y ago
Only the amplitude of the audio tone determines the percentage modulation of an FM transmitter
Wiki User
∙ 12y ago
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What is percentage power saving if AM transmitter with modulation index m equals 0.5 is replaced by SSBSC transmitter with same modulation index?
Pt=Pc+2Psf, m=0.5 ,Psf=0.0625, saving in power is 100-6.25 % = 94.75%
Why is percentage modulation less than 100 percent in amplitude modulation?
The operator and transmitter engineer control the modulation level. It can be adjusted so that audio peaks produce 100% modulation, or less than 100%, or more than 100%. More than 100% produces audio distortion in the receiver, and it also 'splatters' across a wider part of the AM dial then it should. It sounds terrible on the radio, and it potentially interferes with other stations.
Why you calculate percentage modulation?
For AM (amplitude modulation) signals, it is the ratio (x100 of course) of the modulating signal to the carrier signal. presumably FM calculations follow a similar course.
Why a high percentage of modulation is desirable?
Is important to use as high a percentage modulation as possible while ensuring that overmodulation does not occur. The side bands contain the information and have maximum power at 100% modulation. And AM transmiters attempt to maintain betwen 90 and 95 percent modulation as a compromise between efficiency and the change of drifting into into overmodulation. sources page 76 second paragraph of the MODERN ELECTRONIC COMUNICATION By Jeffrey S.Beasley and Gary M.Miller
What is a Food cost percentage?
It is a calculation that determines the % of cost to sales.
What determines bac?
BAC is a percentage measurement of the level of alcohol in your bloodstream.
What determines the percentage of transparency in a layer?
opacity slider on layers palette
What is the critical flicker fusion frequency?
By definition, the CFFF is "the highest or lowest temporal frequency, at a given percentage modulation, that can be resolved." (Schwartz, Visual Perception, 3rd ed.) In other words, the limits of distinguishing a flashing light from a steady one (at both the slow and fast end limits). Percentage modulation is calculated using the amplitude of the luminance of the light source, and the time-averaged luminance of said light source. In other words, the difference between the brightest/dimmest points in the cycle, averaged over the speed it takes to vary between the two points. Percentage modulation is used to calculate Relative Sensitivity, which is (1 / Percentage Modulation). For example: A lightbulb powered by Alternating Current (AC) is flickering. This is not visible to the normal human eye for two reasons (both variables in the definition of CFFF.) The temporal frequency of the AC in most American homes is 60Hz. The high temporal frequency cut-off for human sensitivity varies, and some cells are known to be sensitive to frequencies as high as 250 Hz, but for general daytime vision, it is lower than 60Hz. Also, the percentage modulation of a light bulb is low, since the change in brightness of the filament is very small. Relative sensitivity is the inverse of the percentage modulation. For flicker to be visible, a light source must have a relatively large change in level of brightness, and flicker at a rate within the human sensitivity range, somewhere between 2 and 50Hz. By definition, the CFFF is "the highest or lowest temporal frequency, at a given percentage modulation, that can be resolved." (Schwartz, Visual Perception, 3rd ed.) In other words, the limits of distinguishing a flashing light from a steady one (at both the slow and fast end limits). Percentage modulation is calculated using the amplitude of the luminance of the light source, and the time-averaged luminance of said light source. In other words, the difference between the brightest/dimmest points in the cycle, averaged over the speed it takes to vary between the two points. Percentage modulation is used to calculate Relative Sensitivity, which is (1 / Percentage Modulation). For example: A lightbulb powered by Alternating Current (AC) is flickering. This is not visible to the normal human eye for two reasons (both variables in the definition of CFFF.) The temporal frequency of the AC in most American homes is 60Hz. The high temporal frequency cut-off for human sensitivity varies, and some cells are known to be sensitive to frequencies as high as 250 Hz, but for general daytime vision, it is lower than 60Hz. Also, the percentage modulation of a light bulb is low, since the change in brightness of the filament is very small. Relative sensitivity is the inverse of the percentage modulation. For flicker to be visible, a light source must have a relatively large change in level of brightness, and flicker at a rate within the human sensitivity range, somewhere between 2 and 50Hz.
In a paternity test what percentage determines that you are the father?
In Illinois, the minimum odds are 500 to 1.
What is the most characteristic of a society with a subsistence level economy?
a large percentage of people engaged in farming.
what determines the texture of soil?
The textural class of soil is determined by the percentage of sand, silt, and clay.
Which is most characteristic of a society with a subsistence-level economy?
a large percentage of the population engaged in farming
