A spectrum analyzer (at the most basic level) functions as a frequency-selective, peak-responding voltmeter calibrated to display the RMS (root-mean-square) value of a sine wave. Not to be confused with a power meter, a modern spectrum analyzer performs digital signal processing with added capabilities to dive deeper into signals.
TinySA is a smaller portable version of equipment that typically would sit on a bench in the electronics lab. You can find all the details at https://tinysa.org Here are the specs
tinySA Ultra
Screen size: 4 inch
Spectrum 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 up to 4.4GHz or rf test signal output up to 5.3GHz when not used as Spectrum Analyzer.
Switchable resolution bandpass filters from 200Hz to 850kHz
Built-in 20dB optional LNA
Color display showing max 450 points providing gapless covering up to the full frequency range.
MicroSD card slot for storing measurements, settings and screen captures.
Input Step attenuator from 0dB to 31dB (can not be used in combination with LNA).
A built-in calibration signal generator that is used for automatic self test and (low) input calibration.
Connected to a PC via USB it becomes a PC controlled Spectrum Analyzer or Signal Generator
Rechargeable battery allowing a minimum of 2 hours of portable use
The input signal must be below +10dBm otherwise the tinySA can be damaged. Use an external attenuator when trying to measure signals with higher power levels.
Both inputs can tolerate maximum 10 Volt DC. Higher voltages may damage the inputs. Use an external DC block when measuring signals with higher DC components.
Using the supplied antenna makes the tinySA very susceptible to ESD damage or overloading. Only use the antenna with great caution. Never put the antenna close to a transmitting antenna. Never touch anything with the antenna
You can destroy the low input attenuator when you enable a high power high output signal and the high and low ports are still connected after doing a self-test or level calibration. Always disconnect high and low inputs before enabling the high output.
Connect one of the SMA Male cables between the CAL port (top) to the RF port (bottom).
Power the tinySA using the tiny power switch at the top.
Touch the screen to activate the menu system and select CONFIG and then SELF TEST. If navigation goes wrong use the BACK button or switch the tinySA Off and On to get back into a known state. If all goes well the self test will pass all tests and you can touch the screen once more to conclude.
If you are running Calibration, leave the SMA cable connected for the next step.
Connect one of the SMA Male cables between the CAL port (top) to the RF port (bottom).
This has to be done only once for one frequency and it does not have to be repeated before every measurement as the level calibration is very stable and frequency independent. From the CONFIG menu execute LEVEL CAL. The red level indicators at the top and bottom should turn white to indicate the calibration has succeeded.