Since most of modern sdr devices can handle signals with a substantial bandwidth, it is desirable to be able to show such spectra.

spectrumviewer is able to handle the input from wide band devices, such as the SDRplay, hackrf devices and limeSDR, each showing a bandwidth of 10 Mhz in the picture.

The program allows "scanning" over a selected band, with a selected interval and a selected frequency step. The programs shows at the same time a frequency spectrum and a waterfall.