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Add BR_902, Brazil 902MHz-907.5MHz (#737)

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As reported by @barbabarros , the Brazilian government has specific support for LoRA[1] across multiple frequencies[2][3].

We currently support Brazil through the ANZ/AU915 band. However, Brazil also has another frequency available for use:

902 - 907.5 MHz , 1W power limit, no duty cycle restrictions


[1]  https://sistemas.anatel.gov.br/anexar-api/publico/anexos/download/a028ab5cc4e3f97442830bba0c8bd1dd
[2] 
https://informacoes.anatel.gov.br/legislacao/resolucoes/2025/2001-resolucao-772
[3] https://informacoes.anatel.gov.br/legislacao/atos-de-certificacao-de-produtos/2017/1139-ato-14448#item10


Fixes https://github.com/meshtastic/firmware/issues/3741

Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>
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Tom Fifield 2025-07-21 18:28:24 +10:00 • committed by GitHub
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meshtastic/config.proto
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@ -919,22 +919,31 @@ message Config {
* Philippines 915mhz
*/
PH_915 = 21;
/*
* Australia / New Zealand 433MHz
*/
ANZ_433 = 22;
/*
* Kazakhstan 433MHz
*/
KZ_433 = 23;
/*
* Kazakhstan 863MHz
*/
KZ_863 = 24;
/*
* Nepal 865MHz
*/
NP_865 = 25;
/*
* Brazil 902MHz
*/
BR_902 = 26;
}
/*