Calculating global clutter margin values

When a clutter databases is not available the following formulas can be used to calculate a “global” clutter value that is entered in the “Margin” in the Propagation Models dialog:

  • Urban = 16.5 + 15 log10(? /100) – 0.12d dB
  • Suburban = Urban -12.0 dB
  • Dense foliage = 65.0 (0.244 log10(?) – 0.442) dB
  • Sparse foliage = Dense foliage – 6.0 dB

where: ? is frequency in MHz and d is distance to receiver in KM. (from ?Radio Propagation in Urban Areas? OT Report 78-144 by Anita Longley)