Plain-language answer: An antenna switch selects among antennas or radios while maintaining the required impedance, isolation, frequency range, and power handling.
Why it matters
Unused ports may be grounded, open, or terminated depending on design. Hot switching or back-feeding another radio can damage contacts and receiver inputs.
Use it correctly
Confirm port topology and ratings, label every cable, reduce power before switching unless specifically rated, and prevent two transmitters from sharing an unsafe path.
The common mistake
Choosing a switch by connector type without checking isolation and power at the operating frequency.
Decision boundary
Current regulation, program rules, manufacturer limits, exact station configuration, and live observations control. Recheck changing rules, solar conditions, and operating status before acting.
