When may an amateur station transmit without identifying on the air?

An amateur station is permitted to transmit without identifying on the air when it is sending control signals for model craft. This rule is in place because the communication involved is typically not intended to communicate information to other operators or the general public; rather, it is specifically for the operation of control systems for devices like model aircraft, boats, or cars. These types of signals are usually brief and designed solely for controlling the model craft, which eliminates the need for the standard identification procedures that apply to typical amateur radio communications.

In other contexts, like brief nature transmissions for adjustments or unmodulated signals, identification is typically still required to ensure that all communications can be appropriately attributed to a licensed operator, maintaining accountability and compliance with regulations. Similarly, power levels below a certain threshold do not exempt an operator from the requirement to identify; all amateur radio transmissions, regardless of power, still necessitate identification except under specific circumstances like controlling model craft.