tinySA

The tinySA are a small spectrum analyzers and signal generators with some nice capabilities:

tinySA
Screen size 2.8 inch
Spectrum Analyzer with two inputs, high quality MF/HF/VHF input for 0.1MHZ-350MHz, lesser quality UHF input for 240MHz-960MHz or
Signal Generator with two output, sine wave output for 0.1MHz - 350MHz and square wave output for 240MHz-960MHz when not used as Spectrum Analyzer.
Switchable resolution bandpass filters for both ranges between 2.6kHz and 640kHz
Color display showing max 290 scan points providing gapless covering up to the full low or high frequency range.
tinySA Ultra
Screen size 4 inchSpectrum Analyzer for 0.1-800MHz or, with Ultra mode enabled, level calibrated up to 6GHz. Can observe signals up to 12GHz
Signal Generator with sine wave output between 0.1-800MHz or square wave or dual tone output up to 4.4GHz when not used as Spectrum Analyzer.
Switchable resolution bandpass filters from 200Hz to 850kHz
Built-in 20dB optional LNA
Color display showing max 450 scan points providing gapless covering up to the full frequency range.

Project website:https://tinysa.org/

Wiki & User group:https://groups.io/g/tinysa/