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ZigBee in nrf52840

Hi everyone

I have a question about zigbee. After reviewing the documentation, I realized that on the nrf52840 chip, you can use zigbee with a frequency of 2.4 GHz. But is it possible to use it with a frequency of 868 MHz? This is not mentioned anywhere, but after reviewing the library files I found this list of frequencies.

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/**
Node descriptor - frequency value
*/
enum zb_freq_band_e
{
ZB_FREQ_BAND_868 = 1, /*!< 868 MGz */
ZB_FREQ_BAND_902 = 1 << 2, /*!< 902 MGz */
ZB_FREQ_BAND_2400 = 1 << 3 /*!< 2400 MGz */
};
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Because of this, I had doubts on this issue.

Thank you in advance.