Which of the following is a practical, widely recommended mitigation for coax connector overheating when delivering high RF power?

• A. Using a connector with an adequate power rating and cooling
• B. Increasing torque beyond recommended values
• C. Only clean the connections
• D. Operate at the same power with no modifications

Answer: (A)

The key idea is power handling and heat management for RF connectors. When delivering high RF power, heat is generated at the connector interface from resistive losses and imperfect contact, and it must be removed efficiently. Using a connector that is rated for the required power and designed to be cooled provides two protections: the contact resistance stays low so I^2R heating is minimized, and there is a path for heat to be carried away through the connector body and any added cooling. This combination keeps the temperature rise within safe limits and reduces the risk of damage or arcing.

Tightening beyond the recommended torque can worsen the problem by deforming contacts or cracking the interface, which increases resistance and heat. Cleaning contacts helps with conduction but doesn’t address the underlying limitation set by the power rating and cooling. Running the system at the same power with no changes simply invites overheating to continue.