The facility 40km northwest of Brasilia originally cost $15 Million USD to build and will turn 50 years old on March 11, 2024. It’s home to several SW, AM and FM transmitters , including Radio Nacional de Amazonias on 6180 and 11780khz. The stations owner, Empresa Brasil de Comunicação , a government owned agency plans to recognize the facility’s Gold anniversary.
Back in 2020 Martin Butera wrote this feature for the Radio Heritage Foundation:
https://www.radioheritage.com/story527/
Cheers, Chris
https://radioinfo.asia/news/first-sw-digital-radio-transmitter-installed-brazil/ These tests were received in parts of the USA.
https://www.drm.org/the-latest-from-brazil/
These tests were conducted in early 2021 IIRC. And what is the status of DRM in Brazil 3 years later? I think Radio Nacional Amazonia has reverted to using AM on both their frequencies after the end of the trial?