Provided by: gnuradio_3.7.11-10_amd64

**NAME**

gr_plot_psd_c - plot power spectral density using GNU Radio

**SYNOPSIS**

gr_plot_psd_c:[options]input_filename

**DESCRIPTION**

Takes a GNU Radio binary file (with specified data type using--data-type) and displays the I&Q data versus time as well as the power spectral density (PSD) plot. The y-axis values are plotted assuming volts as the amplitude of the I&Q streams and converted into dBm in the frequency domain (the 1/N power adjustment out of the FFT is performed internally). The script plots a certain block of data at a time, specified on the command line as-Bor--block. The start position in the file can be set by specifying-sor--startand defaults to 0 (the start of the file). By default, the system assumes a sample rate of 1, so in time, each sample is plotted versus the sample number. To set a true time and frequency axis, set the sample rate (-Ror--sample-rate) to the sample rate used when capturing the samples. Finally, the size of the FFT to use for the PSD and spectrogram plots can be set independently with--psd-sizeand--spec-size, respectively. The spectrogram plot does not display by default and is turned on with-Sor--enable-spec.

**OPTIONS**

-h,--helpshow this help message and exit-BBLOCK,--block=BLOCKSpecify the block size [default=8192]-sSTART,--start=STARTSpecify where to start in the file [default=0]-RSAMPLE_RATE,--sample-rate=SAMPLE_RATESet the sampler rate of the data [default=1.0]--psd-size=PSD_SIZESet the size of the PSD FFT [default=1024]--spec-size=SPEC_SIZESet the size of the spectrogram FFT [default=256]-S,--enable-specTurn on plotting the spectrogram [default=False]

**SEE** **ALSO**

gr_plot_char(1) gr_plot_const(1) gr_plot_fft_c(1) gr_plot_fft_f(1) gr_plot_float(1) gr_plot_int(1) gr_plot_iq(1) gr_plot_psd_c(1) gr_plot_psd_f(1) gr_plot_qt(1) gr_plot_short(1)