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Update radio-settings.mdx

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docs/about/overview/radio-settings.mdx
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@ -38,16 +38,14 @@ There are four frequency slots defined with the standard radio preset `LongFast`
### 868 MHz
:::info
868 MHz is generally the most popular band for Meshtastic in the EU.
:::
The maximum power allowed for Europe is +27 dBm ERP ([Effective Radiated Power](https://en.wikipedia.org/wiki/Effective_radiated_power)).
The band range is from 869.40 to 869.65 MHz. This is less than the 863–870 MHz range defined as SRD Band, but allows for a higher ERP and a duty cycle of 10%.
The band range is from 869.40 to 869.65 MHz. This is less than the 863–870 MHz range defined as SRD ([Short Range Devices](https://www.etsi.org/technologies/short-range-devices)) Band, but allows for a higher ERP and a duty cycle of 10%.
There is one frequency slot defined with the standard radio preset `LongFast`. After factory reset the radio will be set to frequency slot 1 with a center frequency of 869.525 MHz.
It is worth noting that 868 MHz is generally the most popular frequency band for Meshtastic in Europe.
## North America Frequency Bands
### 915 MHz (ISM Band)