Which term indicates a switch to a designated frequency with no required acknowledgment?

The term that indicates a switch to a designated frequency with no required acknowledgment is "Push." In communication protocols, a "push" allows operators to move to a specific frequency or channel without needing any form of confirmation from the user or recipient. This is particularly useful in tactical and emergency scenarios where time is of the essence, and immediate communication is necessary without the delay of waiting for an acknowledgment.

The other terms listed, while they may pertain to various aspects of communication or operation, do not specifically denote this immediate switch without acknowledgment. For example, "Crossover" typically refers to a transition in operational control, while "Change" could imply a broader adjustment that may include acknowledgment. "Toggle" refers to switching an option on or off but does not imply the specificity of an immediate frequency switch without acknowledgment. Thus, "Push" is the most accurate term for this context.