What emission modes are permitted in the mode-restricted sub-bands at 50.0 to 50.1 MHz and 144.0 to 144.1 MHz?

In the mode-restricted sub-bands at 50.0 to 50.1 MHz and 144.0 to 144.1 MHz, only Continuous Wave (CW) emissions are permitted. This limitation is in place to manage the usage of these frequencies within amateur radio, ensuring that the bands are used efficiently and remain interference-free for operators who require precision communication.

CW, commonly known as Morse Code, has been prioritized in these segments because it is a very efficient mode for communication, especially under poor propagation conditions. It allows for reliable communication over long distances with minimal bandwidth usage, making it suitable for enthusiasts and operators working with QRP (low power) stations.

Because this frequency range is reserved for CW only, other modes of transmission such as SSB (Single Sideband) or digital modes like RTTY (Radio Teletype) are not allowed here. Therefore, the restriction aligns with regulatory guidelines aimed at preserving effective communication practices in amateur radio.