Hi! Jerry, from my PC terminal any added comment does not get posted to this nmrwiki. Hence I resort to use the 'Your Answer' box instead of adding a comment right below your posted comment. "Changing coil turn spacing isn't very possible. The maker already found the best shape to optimise the RF field" . This remark in your comment makes me seek an additional clarification.
Does it mean you are using a commercial spectrometer and your experiments are getting into such realms where the required conditions for RF power (of RF field strength and homogeneity in the sample coil) are beyond the tested specifications and approved by the maker?
