Set these to eliminate interference from other groups sharing the same frequency. "CTC" refers to analog sub-audible tones, while "CDC" refers to digital codes. Leave them as "None" if you want to hear all traffic on the frequency.
: Software varies by model series. For example, the PT568 uses KSP568 , while the DP770 and TM840 use Kirisun CPSp . kirisun radio programming software