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FFT development board from RHDC Services features a fully functional
spectrum analyzer for just £59.95 ($95.35). An ultra low power Sharp
96x96-pixel display and judicious selection of processor and peripheral
components yields a module that consumes only 3 μA in a static
state and 1.3 mA while FFT'ing. Per their website, "The FFTD1A
can typically display an image and maintain a real time clock using
less than 10µW. Assuming a CR2032 coin-cell delivers 200mAh, that's
around 6 years battery life."
software together with the FFTD1A development board allows users to
develop application software that performs Fourier analysis with a 12-bit,
200 ksps input and a 50 dB SFDR. Add a simple mixer, LO, and filter
to extend the useful range to just about any frequency band. RHDC Services
also provides RF R&D and communication systems engineering services.