more info: vertical sync: 60 Hz, period 16667 us, tolerance 3 us, fraction 1/5000 h sync: freq 15,750 period 63.5 us, tolerance .119 us, fraction 1/500 1000000/(63.5+.119) 15718.57463965167638598531 1000000/(63.5-.119) 15777.59896498950789668828 2*15718.57463965167638598531 31437.14927930335277197062 2*15777.59896498950789668828 31555.19792997901579337656