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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.)
Do you have another radio to try it with?
Another cheap option is the truSDX https://dl2man.de/
I have it working with my Android Phone using https://github.com/N0BOY/FT8CN
It makes for a super lightweight pack. I usually bring a 17foot whip antenna to a park or summit and get contacts all over the world.