What is best FSK Frequency for indoor environment (e.g. Apartment) 433Mhz, 858Mhz or 915Mhz ? Which one is better for my usage ?
As far as I know, in the USA, you cannot use 433 MHz or 858 MHz, so it will have to be 915 MHz.
However, you will need to consult the regulations in your country. Try here: http://reboot.fcc.gov/spectrumdashboard/searchSpectrum.seam
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