J- No there isnt a standard that I can see - Some use between 0.1 or 0.2Hz split or more for dot 60/120 and presumably wider as the speed increases. The trick as you state is to chose a split that do
Laurence, Good luck watching. The beacon is on ~137778.07 and .22. I do not know if .15 is too much split.... Is there a standard?. It is DFCW120, sending "VY1JA" as usual. It is tuned a little lower