What is the primary purpose of a dummy load?

The primary purpose of a dummy load is indeed to prevent the radiation of signals when making tests. A dummy load is essentially a device that dissipates energy from a transmitter without radiating it into the atmosphere. This allows operators to test their equipment and make adjustments without unintentionally transmitting signals that could interfere with other communications or violate licensing regulations.

Using a dummy load is crucial during testing and maintenance because it ensures that the output of the transmitter is absorbed rather than radiated, providing an accurate representation of the transmitter's performance. This helps in troubleshooting and verifying proper operation without causing disruptions in the communication bands.

In practical terms, this means that when you're conducting tests, you're not creating signals that could interfere with ongoing communications, making it a responsible practice in amateur radio operations.