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Awesome to see someomeone building this.
I have had the the? about using a cc1101 transceiver module as a logarithmic detector and even have some hardware built, but I had problems with the software.
Si4432 is a legitime detector choise the orginal RF Explorer handheld spectrum analyzer used it!
It's schematics should also be available for study.
I might have to build one of these for playing around with it, the PC side software really makes it special.?
Other modules of interest might be cc1101 as those ate even cheaper than si4432 and nrf24l01, which has a cw testmode and rssi receive register too.
The nrf might be usefull as a 2.4GHz test source.
There is a 2.4GHz spectrum analyzer project that uses it as the main device.