The first step of going to 2.4GHz development is to look for a way to see the 2.4GHz signal. After checking in online store, I picked some cheap used mixer that have a frequency range of 300-4300MHz. Today the mixers just arrived, I tried to hook it up with the signal generator in the LO port, tuned to 1.9GHz and plug in an antenna to the RF port, attempting to receive a nearby the 2.40-2.48GHz bluetooth signal. As seen from the screen of spectrum analyzer, the signal is downconverted to 500MHz~580MHz. By doing this downconversion, the old 1.8GHz spectrum analyzer is successfully upgraded to a 2.4GHz, in a very low cost. Not a bad start.
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