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While rectification pulsations are caused due to ac not being converted to dc perfectly. This causes hum (low frequency humming noise). To smooth these pulsations filters are used. Noise is an unwanted signal in the communication system.

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16y ago

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What is terrestrial and extra terrestrial noise in radio communication?

Terrestrial noise is noise that originates on the earth. Extra terrestrial noise comes from space.


Why is a wire wrapped around GM radio antennas?

The spiral shape lessens wind noise created by typical cylindrical shaped antennas masts. It is there for passenger compartment noise reduction only, and has nothing to do with the noise or clarity of the radio signal it receives.


Which satellite radio has the best reception?

All satellite radios will have equal reception as they meet a common wireless specification.


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Humbuckers are called "Hum"-"buckers" for a reason- they are two single coils wired to achieve noise phase-cancelation. Single coils do not have this feature, but if you notice that if you have a 5-way selector switch and you use your KNECK and MIDDLE singlecoils on a Stratocaster (assuming you have a 3 singlecoil setup) or a MIDDLE and BRIDGE, there is no hum, because of this sample principle.


Radio reception improves after sunset-why?

If you mean FM/AM radio: Radio reception is based off the bouncing of radio waves off of the upper atmospohere and ionosphere. But in the daylight, the sun causes molecular turbulence in those layers like photodissociation and infrared absorption. Imagine trying to look in a liquid mirror that has a lot of turbulence vs one that is rather stagnant. Sunlight makes the "mirror" of the upper atmosphere and ionosphere turbulent while in comparison the night sky is a more stagnant "mirror" Particularly, radio stations switch to low power mode some point after dark because of the substantial increase in transmission-reception ability. ---- If you mean radio astronomy: Your question is better stated, "why does the signal-to-noise ratio improve after sunset" where "improve" means "increase". Though it is not as dramatic as the visible or infrared emissions, the sun is a strong radio source. As a result, if we are looking for radio signals that are not the sun, then the sun is considered to be part of the background noise. Then after sunset, this noise source is propagating through the earth and not directly into the radio telescopes. As a result, the amplitude or level of noise has decreased and the signal has remained mostly the same and thus the signal-to-noise has increased by dividing by a smaller noise. signal-to-noise is literally "signal divided by noise".

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