What is the secondary frequency for the control agency in mission number 0401?

• A. 235.7 MHz
• B. 450.25 MHz
• C. 100.00 MHz
• D. 320.75 MHz

Answer: (D)

A backup communications path is essential for uninterrupted command and control. The secondary frequency for the control agency is the designated back-up channel used when the primary is unavailable, congested, or experiencing interference, ensuring the agency can still reach aircraft and coordinating units without breaking the mission flow.

For mission 0401, 320.75 MHz is chosen as that backup channel. This frequency sits in the VHF range commonly used for control communications, offering reliable line-of-sight connectivity and compatibility with the control network’s equipment and operating environment. It provides a distinct, usable channel that won’t conflict with the primary frequency, helping maintain continuous oversight and coordination.

The other frequencies either aren’t allocated as the mission’s backup channel, or wouldn’t meet the requirements for a reliable secondary control link in this context, which is why 320.75 MHz is the appropriate choice.