Committee on Radio Astronomy Frequencies

Separation distances required for terrestrial transmitting stations using free space attenuation

This routine calculates the separation distance for land MESs required to protect the Radio Astronomy Service using Recommendation ITU-R P.525.

The calculation uses the geographic summation methodology. Since a generic solution is anticipated: no terrain model is included.

Calculation details and assumptions are outlined in ERC Report 26.

The protection criteria for Radio Astronomy are given in Recommendation ITU-R RA.769.

transmitting power level per individual station (e.i.r.p.): (in dBW)
frequency: (MHz)
transmitter bandwidth: (MHz)
density of active users: (km-2)
maximum permissible spectral power density: (in dB(Wm-2Hz-1))
initial inner radius of first circle from Radio Astronomy Station (>= 0.001 km): (in km)
number of rings for calculation:

Fill in and click to get results
or click reset to renew all parameters

Last modified: March 5, 2004