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Re:Rust SDR Amateur Radio Network Interface by cadr on Thursday September 21, 2023 @04:59PM (#37604246)
HackRF One is an option. There are a number of others. Legality varies by country/frequency/power level.

Can also make a Raspberry Pi act as a transmitter (https://github.com/F5OEO/rpitx), which could hit the zwave frequency but not the zigbee one. (Also, make sure to put a low pass filter on it.)

Re:Rust SDR Amateur Radio Network Interface by wkat4242 on Thursday September 21, 2023 @07:56PM (#37606085)
Or even better, a band pass. The output from that pin is really dirty.

I wouldn't recommend it for anything that will actually transmit into an antenna. Even with filters.