The “chirp” signal sweeps smoothly across specific frequency range: usually 125 kHz ... If you stay within the ISM bands, usually 868/915 MHz and 2.4GHz, licensing isn’t required.

We suppose the fail-badge could be pinned on [electronupdate] for this one in a way; after all, he did shell out $200 for the RF Explorer signal generator, which touts coverage from 24 MHz to 6 GHz.

The ShortLink Sub-GHz Transceiver RF IP 'SL40LP_Sub1GHzTrx_1' is a complete mixed signal RF IP for the 433, 868 and 915MHz frequency bands. It is compliant with IEEE 802.15.4-2015 and offers data ...