Spectrum Analyzer Board, High Accuracy Signal Source Module, 35‑4400M USB Network Signal Analysis with Tracking Source: Amazon.com: Industrial & Scientific
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VOLTCRAFT DSO-3204 USB Oscilloscope 200 MHz 4-channel 250 MSa/s 16 KP 8 Bit Digital storage (DSO), Spectrum analyzer 1 | Conrad.com
4.4 GHz Spectrum Analyzer and Measuring Receiver Only € 1.245 (ex.VAT)
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Spectrum Analyzer Usb Ltdz 35-4400mhz Signal Source With Tracking Source Module Rf Frequency Domain Analysis Tool With Shell - Accessories - AliExpress