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FREE SPACE ATTENUATION
Decibel free space attenuation calculation for line of a site signal path.
Most RF comparisons and measurements are performed in decibels. This gives an easy and consistent method to compare the signal levels present at various points. Accordingly it is very convenient to express the free space path loss formula, FSPL, in terms of decibels.

Calculation to determine the free space path loss in dB for a given frequency and distance.

Example 

Calculation to determine the free space path loss in dB for a frequency of 146MHz at a distance of 10km

FSPL = Free Space Path Loss in dB

f = Frequency in MHz

d = Distance in km

Fig 1 The chart shows free space path loss for five amateur band for distances from 1 to 10000km.

 

 

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Page last revised 07 February 2016  
 

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