> For the complete documentation index, see [llms.txt](https://wiki.astrawireless.net/astra-wireless-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.astrawireless.net/astra-wireless-documentation/technical-documentation/astrawireless-quasar-technical-user-manual/services/spectrum-analyzer.md). # Spectrum analyzer In the "Spectrum Analyzer" menu, you can perform a deep analysis of the radio emissions in the environment where the unit is placed. The unit scans the radio spectrum on all available frequencies. In order to obtain the information as accurate as possible, the scanning process may take a while.
The following parameters are available in order to operate the Spectrum Analyzer:
ParameterDescription
Start FrequencySet the first frequency for scanning (in MHz).
End FrequencySet the last frequency for scanning (in MHz).
Scan step

Set the scanning frequency step (in MHz).

It is recommended to set 1 MHz “step” value to get more precise scanning results.

Channel widthSet the bandwidth (in MHz).
Click on "Start scanning" button to start scanning. You may stop scanning by clicking on appropriate button. By clicking the "Last Snapshot**"** button, you get the final scanning results. The most common usage of this feature is when you perform a spectrum scan at the remote unit on the other side of the wireless link. When running a spectrum scan at such a unit (accessible via the RF interface), connection to this unit will be lost for a scan time. "*Last Snapshot*" option allows viewing scan results when the connection gets up again. To download picture of last scanning result click the "Save as PNG" button.