I have a trx-2 updated with latest firmware. Local detention center has NXDN with frequencies listed but no talkgroups in the database. Windsor Southwest Detention Centre Trunking System, Windsor, Ontario - Scanner Frequencies I have setup with a wildcard but when it hits I only get a dial tone sound. I have also tried importing as a conventional frequency with a RAN of any, but get the same results. Is the dial tone sound what you would get if they are using encryption?