An Experimental Comparison of Coding Vs. Frequency Diversity for HF Telegraphy Transmission

This note reports a telegraphy test in which a Rate 1/2 error-correcting coding system was operated on two channels of an HF modem while an in-band diversity system transmitted the same information on two other channels. Error rates of coding and diversity operation are given, showing that coding was greatly superior to diversity when each used the same bandwidth.