My bad, I did that wrong. 103.5 would be 103. 156.7 would be 156. > NAC= Network Access Code. It serves the same purpose as CTCSS. > 293 is the most common NAC. The unwritten standard is that if the CTCSS is > 103.5, when you convert to P25 the NAC would be 1035. If the CTCSS was > 156.7 the NAC would be 1567.