UK only uses 5 different CTCSS tones for repeater access.

On 03 September 2018 at 23:03 "Christopher F. Beesley" <chrisbees2@hotmail.com> wrote:

 

In the UK there were 38 different CTCSS tones available last time I looked, and 16 repeater channels on 2m. So you need 608 memories to deal with every possible combination of repeater channel and CTCSS code.