David and list As tuning is more critical on the 700 mode as compared to the 1600 mode and there is an absence of a distinct central carrier then a couple of extra tick marks on the FreedDV GUI showing the edges of the signal, when correctly tuned, as well as the centre would provide easier tuning of signals using coherent psk modes. Note this is compounded by having an even numbers of carriers where correct tuning is with the centre tick mark between the 7th and 8th carriers,not aligned with a carrier. It is easy to select the mid point between the wrong carrier pair. regards Peter VK5APR
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