New Physical Spacing guidelines (as of 12/01/2024):
We coordinate four levels of protection based on the antenna Height Above Average Terrain (HAAT) and the Effective Radiated Power (ERP) of your proposed repeater facility plus the protection radius of any/all potentially affected co-channel repeaters.
How we calculate HAAT:
We calculate HAAT using the FCC’s Antenna Height Above Average Terrain (HAAT) Calculator using the coordinates and height of the antenna centerline above ground that you provide in your coordination request. It is important that you provide accurate coordinates (measured at the base of the tower) and antenna height information. We use 8 radial measurements and GLOBE terrain database to calculate HAAT.
Protection Levels:
- Shared/Non-Protected – Zero protection radius for repeaters with HAAT of 50 feet or less and ERP of 100 watts or less. There are specific frequency pairs reserved for SNP use in most areas.
- Level 1 – 40 mile protection radius for repeaters with HAAT between 50 and 150 feet and ERP above 30 watts.
- Level 2 – 50 mile protection radius for repeaters with HAAT between 150 and 300 feet and ERP above 90 watts.
- Level 3 – 60 mile protection radius for repeaters with HAAT between 300 and 500 feet and ERP above 120 watts.
- Level 4 – 70 mile protection radius for repeaters that have a HAAT above 500 feet, and an ERP above 150 watts.
Physical spacing example: Existing repeater is Level 2, proposed new repeater is level 1, the total physical spacing must be 90 miles (the sum of both protection radii) or more.
Any repeater that does not have their ERP or antenna height information on file will be coordinated at Level 1. If you believe your machine may be mis-categorized, please contact the coordinator ASAP so that we may provide the appropriate level of protection.