Selección de banda de radio frecuencia y salida de potencia para sistemas inalámbricos follow focus

2007Foro Follow Focus

Tiene 19 años. Es posible que el equipo y los precios hayan cambiado desde entonces.

DiscutidoLos participantes no estuvieron de acuerdo y no llegaron a una conclusión. Lee los hallazgos como posturas, no como una respuesta.

Follow focus sistemas operan en diferentes bandas de frecuencia: 434 MHz, 900-928 MHz y 2.4 Microondas GHz, cada una con diferentes características de rango e interferencia.
Bandas de frecuencia inferior como 434 MHz experimentan interferencias de dispositivos de mayor potencia como llaves de coche, intercomunicadores de seguridad, micrófonos de radio, martillos ligeros y lectores de tickets que ocupan el espectro de 400-800 MHz.
El sistema 2.4 GHz Preston funciona a una distancia de aproximadamente 1 kilómetro pero compite con transmisores WiFi y sistemas inalámbricos de control de cámaras en la misma banda de frecuencia.
Higher frequency does not automatically provide longer range; range is inversely proportional to frequency, so 10 milliwatts at 2.5 GHz does not deliver ten times the range of 1 milliwatt at 900 MHz.
FCC Part 15 compliance limits the BFD system to 1-2 milliwatts output, providing roughly 300 feet (100 meters) line-of-sight range and penetrating through multiple walls.
Concert venues and large events create crowded RF environments with powerful transmitters that can jam wireless follow focus systems regardless of frequency band chosen.
The 900 MHz band was historically abandoned due to overcrowding but later had less interference as users migrated to 2.4 GHz frequencies.
The 2.4 GHz band experienced interference problems during a Paris shoot where multiple Preston systems and other 2.5 GHz devices created jamming issues.

Discussion is from 2007; current frequency allocations and device populations may differ significantly.
No technical specifications provided for Bartech system output power, only frequency range mentioned.
Claims about Preston system 1 km range are questioned by forum participants and not definitively confirmed.
Specific interference problems described are anecdotal and tied to particular concert venues and event setups rather than systematic testing.
Solutions proposed were not conclusively resolved in the thread.