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What is the difference between amlitude shift key and frequency shift key?
Wiki User
∙ 13y ago
Amplitude shift keying changes the height/power of the transmitted signal without altering the frequency. Frequency shift keying changes the frequency of the transmission without altering the height/power of the transmitted signal.
Morse Code is an example of amplitude keying where the amplitude is 0 or 100%.
RTTY teleprinter uses FSK with two frequencies and the codes that represent text characters are sent with patterns of the two frequencies.
Wiki User
∙ 13y ago
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How do you convert the passband frequency into baseband frequency the range of 2Ghz passband?
Use the shifting property of the Fourier transform to shift the frequency response down to baseband. Multiply the time-domain signal by a complex exponential with the frequency of the amount you want to shift the frequency response.
The transmit frequency is 140.250 MHz what is the best choice for the receive frequency?
Try 140.250Mhz. There should not be any shift from sent to received.
In phase modulation the amount of phase shift in the carrier signal depends on the of the modulating signal and the rate of phase shift depends on the of the modulating signal?
Amplitude Frequency
What is the significance of 432 hertz?
432 Hertz was the frequency of the note A, used as the standard of tuning for musical instruments prior to the shift to 440 Hertz. Many people see a significant link between 432 Hertz and the human mind, suggesting that the frequency subconsciously relaxes our brain. That is why many people are pushing for 432 Hertz as the concert tuning pitch.
If you drive away from a radio transmitter does the radio signal you receive from the station get shifted to longer wavelengths?
A: the frequency of a transmitter whatever it is is fixed therefore the frequency will remain the same Clarification: Radio waves are similar to sound waves in some regards, but not really as is implied by this question. I believe the asker is referring to the phenomenon seen with cars and horns, where when moving towards a person, the horn will have a higher pitch (higher frequency shift), and while moving away, will have a lower pitch. The strict answer to the question is yes, there will be a slight frequency shift. The frequency shift is relative to the wave speed, however. Sound waves move relatively slowly through the air (~750mph, 60mph is ~8% of this), which is why moving at 60mph causing very noticeable pitch change. But electromagnetic waves move at the speed of light, or 3 x 10^8 m/s (6.71 x 10^8 mph), so the actual frequency shift will be insignificant unless travelling at a similar speed.
What is the difference between phase and frequency?
No matter what frequency, there are 360 degrees that can be associated with it (the phase). Here's an equation to summarize: V(t) = A sin ([w*t] + p) A is amplitude w = frequency p = phase shift
The amount of frequency shift during modulation is called?
Frequency shift keying in digital communication and Frequency modulation in analog communication..........
What is the difference between cosmic background radiation and red shift?
Cosmic microwave background radiation is a specific radiation. Red shift is a change in frequency due to the fact that an object moves away from us (or for some other reason, such as a gravitational well); and that affects ALL types of radiations.
How does a METAL sensor work?
Usually a colpit oscillator is used whereby a its coil can be of a loop of wire as metal is detected it will shift frequency as a result and the difference in frequency can be used to cause a display to an output.
What is the difference between a stick shift and manual shift?
In general, none. They are two different terms for the same thing.
Why pf maintaining for ac only not in DC?
Power Factor measures the phase shift between current and voltage waveform. Since DC has no frequency there can be no phase shift.
Disadvantage of frequency shift key?
The disadvantage of frequency shift key is it requires high bandwidth. The advantages of it are that frequency shift keying promotes long distance communication, it has high security, low noise, efficiency is high, and decoding of signal is easy.
A in frequency is called blue shift?
A increase
How do you convert the passband frequency into baseband frequency the range of 2Ghz passband?
Use the shifting property of the Fourier transform to shift the frequency response down to baseband. Multiply the time-domain signal by a complex exponential with the frequency of the amount you want to shift the frequency response.
What is an explanation of the Doppler shift?
The Doppler Shift is a change in frequency due to the Doppler Effect.
How does speed affect the frequency of reflected waves?
The Doppler Effect describes a frequency shift in reflected waves in proportion to the relative speed between the receiver and the reflected object. For instance, in a radar speed trap, the frequency shift in reflected radio waves allows the unit to calculate the speed toward (higher frequency) or away from (lower frequency) the transmitter/receiver unit. When you drive past a steady noise source, such a bell or a horn, the sound has a higher frequency as you approach and a lower frequency as you depart.
How does the Doppler effect works?
As soon as there is a relative movement between two objects - one receiver and one transmitter - the wave lenght of the signal received/reflected is changed. Since frequency is inversly proportianal to wavelenght, frequency is changed as well. The difference between sent signal frequency and received signal frequency may be used to calculate your own speed (aircrafts) or another object speed (road speed radars).
