cw dual-propeller automatic keying method: differences between iambic mode A and mode B
The radio has two modes for selecting the automatic key: mode A and mode B. The difference between the two is that in mode A, when both paddles are pressed down simultaneously and then released, the current "da" or "ta" sound will be cut off. For example, if we want to transmit the letter "K", in mode A, pressing both paddles at the same time and then releasing them will only produce the sound of "N". To produce the sound of "K", you need to intentionally make the "da" paddle press down slightly earlier than the "ta" paddle, and then release it while making sure the "ta" paddle is released later. In mode B, when both paddles are pressed down simultaneously and then released, the "da" sound will be repeated once more, and the "ta" sound will be repeated once more. When transmitting the letters "K" and "R" in mode B, it's easier because you can simply press both paddles at the same time and release them simultaneously. The key is to pay attention to which paddle (da or ta) is pressed down first when releasing. This method of pressing can increase the transmission speed, but it only works for the letters CFKLQRY and punctuation marks such as commas, periods, and exclamation points. In short: in mode A, when both paddles are released simultaneously, it cannot automatically produce an additional "da" or "ta" sound after the first one is pressed; while in mode B, it will automatically produce an additional "da" or "ta" sound after the first one is pressed.
[CW Double-Ply Automatic Keying and Embossing Method, and the Differences Between Mode A and Mode B - Bilibili] https://b23.tv/wmhgz9r
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