Which of the following VHF/UHF band segments are limited to CW only?

The frequency segments from 50.0 MHz to 50.1 MHz and 144.0 MHz to 144.1 MHz are designated for Class C operation under the rules set by the FCC for amateur radio. These segments are specifically allocated for Continuous Wave (CW) operation, which is a mode of transmitting radio waves that is simple and effective, commonly used for sending Morse code.

In these particular bands, the regulations restrict the use of more complex modes, such as voice or digital modes, to ensure that operators utilize the frequencies for CW. This not only preserves the nature of the communication but also minimizes interference among users operating on the same segment.

The other frequency ranges mentioned in the question, such as 219 MHz to 220 MHz, 420.0 MHz to 420.1 MHz, and 902.0 MHz to 902.1 MHz, have broader allocations that include modes beyond CW, such as voice and data modes. Thus, these frequencies are not exclusively limited to CW operation.

Therefore, the answer correctly identifies the segments meant solely for CW use, aligning with regulations designed to maintain order and efficiency in amateur radio communications.