That isn't random amounts. There are 50 standard CTCSS tones and the up/down arrows scroll through them. It also has nothing to do with the VFO frequency tuning steps of 2.5, 5.0, 12.5 KHz. Tom ND5Y > The problem is the ctcss codes on the Baofeng seem to increase by random > amounts ranging from 2.3 to 3.7 on the codes I have checked so far.