FM Example	TV Example

These contours are generated weekly with the Friday COB data from the FM and TV engineering databases. The following contours are calculated using code created by OET staff and proprietary terrain code from Communications Data Services. The contours are created by calculating the Antenna Height Above Average Terrain (HAAT) and Effective Radiated Power (ERP) for each of the 120 radials at 3 degree intervals. Both HAAT and ERP are calculated for each radial using a three arc second terrain database and the linearly interpolated antenna gain.

Contour Data for download in MapInfo Interchange Format

• AM
  • Daytime Contour (~2 MB)
• FM
  • Protected Contour (zip file) (~ 30 MB)
• TV
  • Grade A & Grade B (zip file) (~ 15 MB)

Other Downloads

• MapInfo Workspaces