Which frequency range does the PAR operate in?

Which frequency range does the PAR operate in?

• A. 8.5-8.7 GHz
• B. 8.8-9.0 GHz
• C. 9.5-9.7 GHz
• D. 9.0-9.2 GHz

Answer: (D)

PAR uses the X-band, around 9 GHz, because that frequency provides a good balance of angular resolution and practical antenna size for ground-based approach guidance. Operating in the 9.0 to 9.2 GHz range gives the necessary beam precision for accurate azimuth and elevation tracking while keeping equipment compact and avoiding interference with adjacent systems. The other offered ranges are either outside the standard PAR allocation or do not provide the same combination of resolution and practicality, so they aren’t the typical PAR operating band.

PAR uses the X-band, around 9 GHz, because that frequency provides a good balance of angular resolution and practical antenna size for ground-based approach guidance. Operating in the 9.0 to 9.2 GHz range gives the necessary beam precision for accurate azimuth and elevation tracking while keeping equipment compact and avoiding interference with adjacent systems. The other offered ranges are either outside the standard PAR allocation or do not provide the same combination of resolution and practicality, so they aren’t the typical PAR operating band.