Definition:During disasters or other emergency events St. Louis Metro ARES®/RACES may break up St. Louis City and County into "opertional zones". The zones are defined as:
- Zone 1 - All of St. Louis County north of Page Avenue (State Road 364)
- Zone 2 - All of St. Louis County south of Page Avenue and also north of Interstate 44
- Zone 3 - All of St. Louis County south of Interstate 44
- Zone 4 - All of the City of St. Louis
Reasons:The two primary reasons for breaking up St. Louis City and County into operational zones are:
- Span of Control - It is easier to manage a widespread disaster if it is handled in coordinated segments.
- Limits of Radio Propagation - After numerous simplex exercises and experiments it was found that 2 meter and 70 centimeter radio waves simply do not carry across all of the terrain covered by St. Louis City and County. Even the four-zone model we selected is not 100% perfect, but to divide the region into even smaller segments would make coordination virtually impossible. This is our best compromise solution.
Frequencies and Nomenclature:The 2 meter simplex frequencies that will be used in the different zones are
- All Zones - HVTac10 147.510 MHz (used for cross-zone and special agency contact)
- Zone 1 - HVTac11 146.415 MHz
- Zone 2 - HVTac12 147.435 MHz
- Zone 3 - HVTac13 146.535 MHz
- Zone 4 - HVTac14 147.585 MHz
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