It used to be a spectrum analyzer was an exotic piece of gear. However, these days it is pretty common for a scope to have some ability to do the job â€” that is, plot amplitude versus frequency. However, a dedicated commercial product will usually have a lot more bandwidth and other features. [Signal Path] picked up an Anrtitsu 7.1 GHz portable spectrum analyzer. An expensive bit of kit â€” anywhere from around $4,000 to $8,000 on eBay â€” if it is working, but this one was not. It needed power, but it was also missing the internal flash card that the device uses to boot.
Being portable, thereâ€™s a lot of digital and RF electronics crammed into a very small space. The initial tear down didnâ€™t look very interesting because it was mostly an RF shield. However, many tiny screws later, you can finally see the actual electronics.