A conventional system uses different frequencies at different sites. A simulcast system uses one frequency across multiple sites, synchronized in time, providing seamless wide-area coverage.
When properly designed and synchronized, simulcast systems reduce interference rather than create it. Precise timing ensures overlapping signals work together instead of competing.
Simulcast systems typically use GPS-based timing or precision network timing to align transmissions down to microseconds.
No. While common in public safety, simulcast systems are also used in transportation, utilities, campuses, industrial facilities, and commercial radio networks.
Yes. Additional transmitter sites can be added to extend coverage, as long as they are properly synchronized and engineered.
Typically within ±1–5 microseconds, depending on modulation and receiver design.
They require precise RF engineering, network timing discipline, and careful site placement. Poor alignment can degrade performance more than a non-simulcast system.
Yes, but analog simulcast is more sensitive to delay spread and phase issues than digital modulation schemes.
Simulcast: multiple transmitters, same frequency
Multicast: multiple transmitters, different frequencies
Voting: multiple receivers selecting the best inbound signal
Yes, but adding sites increases delay management complexity and requires re-optimization of timing and RF overlap zones.