Thursday, 24 November 2011

External Noise

How to reduce external noise ?
Ans) By locating the receivers at far waway places.
Now what is external noise?

  • it is the Atmospheric Noise < 30 MHz ( it is very little in VHF and above.)

  • it is Extra terrestrial noise 8 MHz to 1.49 Mhz ( e. g. solar noise, not much of it penetrates below 20 Mhz, penetrates down ionosphere )

  • it is Industrail Noise 1 to 600 MHz

Receieved Noise increases as the receiver BW increases.

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