In 1992 Carlos entered the amateur service in category C.
In 1995 he upgraded to category B, then to B+ morse.
In 2009 Carlos took the exam for category A, always with the same station call sign: CT1END.
He retired after a 32-year career in military transmissions and security and remained in the military reserve service until 2019. Carlos retired in September 2024.
His DXCC entity totals are 306/312; IOTA award at 200 islands and WPX award for mixed is 1539.
He is a member of the REP – Rede dos Emissores Portugueses.