An application that can calculate the error rate between two RTTY messages.RttyCompare is a utility that compares the sent and received RTTY messages and calculates the error rate. It converts both texts to the Baudot code, removes LTRS, FIGS, CR, LF and space characters, and finds the best match between the messages using the dynamic programming algorithm. This algorithm is smart enough to find the mapping even at very high error rates when the text is completely unreadable. In fact, it is too smart and finds some similarity even between the random sequences, thus the CER values on the charts above are a bit underestimated. The calibration chart below can be used for correction.