Carlos seeks help identifying signals by Thomas from The SWLing Post on 2019-12-21 11:45 (#4WWX8) Many thanks to SWLing Post contributor, Carlos Latuff, who writes: Attached are two different recordings. Both made in South Brazil. - Florianopolis, 26/11/2019, 19h13 (Brasilia time) 12015 kHz https://archive.org/download/audioflorianopolis/Audio%20Florianopolis.wav - Porto Alegre, 12/12/2019, 20h11 (Brasilia time) 7455 kHz https://archive.org/download/audioflorianopolis/Audio%20Porto%20Alegre.wav Searching on the Web I found these two frequencies related to US Navy NATO RTTY station ["]