* **Signal Generator** - used to create various types of repeating or non-repeating electronic signals for testing and evaluating electronic devices and systems.

* **S-parameters** - are a way to characterize the behavior of radio frequency (RF) networks and components. They describe how much of a signal is reflected, transmitted or transferred between PORTS. In case of s11 (s-one-one), the return loss of a single antenna or port is measured. In s12 (s-one-two) or s21 (s-two-one), the interaction between ports is measured.

* **SA** - Spectrum Analyzer. A device that measures the (power) magnitude of an input signal vs frequency. It shows signal as a spectrum.

* **SA** - Signal Analyzer. A device that measures the properties of a single frequency signal. This can include power, magnitude, phase, and other features such as modulation.

* **SNA** - Scalar Network Analyzer. A device that measures amplitude as it passes through the device. It can be used to determine gain, attenuation, or frequency response.

* **VNA** - Vector Network Analyzer. A device that measures the network parameters of electrical networks (typically, s-parameters). Can measure both measures both amplitude and phase properties. The [wiki article on network analyzers]( https://en.wikipedia.org/wiki/Network_analyzer_(electrical)) covers the topic in detail.

* They have a 'TinySA Menu Tree' PDF doc that has been very useful

* [The main TinySA GitHub](https://github.com/erikkaashoek/tinySA/)

* [main.c](https://github.com/erikkaashoek/tinySA/blob/434126dcc6eed40e4e9ba3d7ef67e17e0370c38f/main.c)

* Hardware, S-parameters and 2 port networks: