What is the primary frequency in megahertz for control?

• A. 235.7 MHz
• B. 123.45 MHz
• C. 260.5 MHz
• D. 141.0 MHz

Answer: (A)

The essential idea is that a primary control frequency must be a designated channel in the mission’s communications plan, reserved specifically for issuing commands and receiving telemetry. This frequency is chosen to sit within the band allocated for control links, provide a reliable two‑way link, and minimize interference from other services or locations. In this case, 235.7 MHz is the frequency assigned as the primary control channel, matching the control plan’s designation for maintaining robust command and control connectivity. The other frequencies are not designated control channels and would risk congestion or interference, undermining the reliability of the C2 link.