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What is frequency coordination?

How Wisconsin's amateur radio community shares a limited spectrum resource fairly and with minimal interference.

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Managing a shared spectrum resource

As many repeaters as possible, with as little interference as possible

Frequency coordination is the process of evaluating, assigning and managing repeater frequencies to minimize interference and promote efficient use of the amateur radio spectrum.

Amateur radio repeater frequencies are a limited resource shared by thousands of operators, clubs and organizations across Wisconsin and the United States. Without coordination, multiple repeater systems could operate on the same or nearby frequencies in the same geographic area, resulting in interference, degraded performance and reduced usefulness for everyone.

The goal of coordination is simple: to allow as many repeater systems as possible to operate successfully while minimizing harmful interference.

Why is coordination necessary?

Every new system is weighed against the ones already on the air

A properly coordinated repeater improves spectrum efficiency while reducing the likelihood of conflicts between systems.

Coordination takes into account

  • 01Existing coordinated systems
  • 02Geographic location
  • 03Elevation and terrain
  • 04Antenna height
  • 05Effective radiated power (ERP)
  • 06Operating mode
  • 07Coverage area
  • 08Potential co-channel interference
  • 09Potential adjacent-channel interference

What coordination is, and what it is not

A documented recommendation, not ownership of a frequency

What is a coordinated repeater?

Reviewed and approved through an established process

A coordinated repeater is one whose operating parameters have been reviewed and approved through an established frequency coordination process. Coordination generally includes assignment of a frequency pair, review of operating characteristics, evaluation of potential interference concerns, documentation of system information and inclusion in coordination records. A coordinated system becomes part of an organized spectrum-management plan designed to benefit the whole amateur radio community.

What frequency coordination is not

No one owns a repeater frequency

Frequency coordination does not give ownership of a frequency. No amateur radio operator or organization owns a particular repeater frequency. Instead, coordination is a documented recommendation intended to promote efficient use of spectrum and reduce interference among systems operating in the same region. It is fundamentally about cooperation, planning and responsible spectrum stewardship.

Who benefits

Repeater owners and operators both gain from coordination

How coordination benefits repeater owners

Coordination gives repeater owners confidence that their systems have been evaluated in the context of other coordinated systems.

  • Reduced interference risk
  • Improved system reliability
  • Better spectrum utilization
  • Documented coordination records
  • Technical review and guidance
  • Long-term spectrum planning

Coordination also helps protect the significant investment many owners make in equipment, infrastructure, sites and maintenance.

How coordination benefits operators

Operators benefit whenever repeater systems can coexist without interfering with one another. Effective coordination helps provide:

  • More reliable repeater operation
  • Improved coverage
  • Better audio quality
  • Expanded communication opportunities
  • More efficient spectrum use
  • Stronger statewide repeater networks

The result is a healthier and more active amateur radio community.

The Wisconsin Repeater Alliance's role

A steward of Wisconsin's repeater spectrum

The Wisconsin Repeater Alliance serves as a steward of Wisconsin's amateur radio repeater spectrum. As a Wisconsin nonprofit corporation governed by a nine-member Board of Directors, the Alliance works to promote fair, transparent and technically sound coordination practices across the state.

Our mission is not simply to assign frequencies, but to help maintain an organized, sustainable repeater environment that benefits repeater owners, clubs, emergency communications organizations and the amateur radio community as a whole.

Frequency coordination is spectrum stewardship

Frequency coordination is more than a technical process. It is a commitment to preserving and protecting amateur radio spectrum for current and future generations.

By working together and following established coordination practices, Wisconsin's amateur radio community can continue to expand coverage, reduce interference, encourage innovation and strengthen the communications resources that serve operators across the state.

Ready to coordinate your repeater?

Start your application or learn what information you'll need to provide.

Repeater Coordination Contact WRA