I have an Alpine CDA-9857r, which has RDS and the TA (Traffic Alert) function. I have TA turned on, and I can tune into GoldFM (104.3) and MixFM (101.1), and the TA icon lights up (TA function is on), and the TP icon lights up (TA station is tuned in). However, I am yet to receive a traffic alert. Do I need to have it tuned in to either station to receive the TA? I guess my question is thus: how can I get RDS-TA to work with my headunit?