The maximum transmission power of NRF905 is +10 dBm (10 mW) for the 868/915 MHz frequency band and +12 dBm (16 mW) for the 433 MHz frequency band.
The NRF905 can be configured for different frequency bands by setting the FREQ register (register 0x05) to the desired frequency band. For example, setting FREQ to 0x01 sets the frequency band to 433 MHz, while setting FREQ to 0x02 sets the frequency band to 868/915 MHz.
The maximum data rate of NRF905 is 50 kbps for the 868/915 MHz frequency band and 100 kbps for the 433 MHz frequency band.
Frequency hopping can be implemented with NRF905 by using the FHSS (Frequency Hopping Spread Spectrum) mode. In this mode, the transmitter hops between different frequencies in a pseudorandom sequence, and the receiver synchronizes with the transmitter to receive the transmission. The FHSS mode is enabled by setting the FHSS_EN bit in the MODEMCFG register (register 0x04).
The range of NRF905 depends on the transmission power, antenna gain, and operating environment. In general, the range of NRF905 can be up to 1 km (0.62 miles) in open space, but it can be significantly reduced in urban or indoor environments.
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