Hi Bill, Yup! You know that, I know that, and so do many of the "seasoned" contesters. However, I am willing to bet a huge number of entrants do NOT know, and I bet some don't even know the terms mark and space, let alone whether they are operating on high or low tones. However, I will be in the contest, and will have some fun either way. 73 all Phil GU0SUP