.TH GR_PLOT_FFT "1" "2024-04-07" "gr_plot_fft 3.10.10.0-rc1" "User Commands"
.SH NAME
gr_plot_fft \- Frequency domain GNU Radio plotting
.SH SYNOPSIS
.B gr_plot_fft:
[\fIoptions\fR] \fIinput_filename\fR
.SH DESCRIPTION
Takes a GNU Radio complex binary file and displays the I&Q data versus time as
well as the frequency domain (FFT) 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 \fB\-B\fR or \fB\-\-block\fR. This value defaults to 1000. The start
position in the file can be set by specifying \fB\-s\fR or \fB\-\-start\fR and 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 (\fB\-R\fR or \fB\-\-sample\-rate\fR) to the sample
rate used when capturing the samples.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
show this help message and exit
.TP
\fB\-d\fR DATA_TYPE, \fB\-\-data\-type\fR=\fIDATA_TYPE\fR
Specify the data type (complex64, float32, (u)int32,
(u)int16, (u)int8) [default=complex64]
.TP
\fB\-B\fR BLOCK, \fB\-\-block\fR=\fIBLOCK\fR
Specify the block size [default=1000]
.TP
\fB\-s\fR START, \fB\-\-start\fR=\fISTART\fR
Specify where to start in the file [default=0]
.TP
\fB\-R\fR SAMPLE_RATE, \fB\-\-sample\-rate\fR=\fISAMPLE_RATE\fR
Set the sampler rate of the data [default=1.0]
.SH "SEE ALSO"
gr_plot_fft_c(1) gr_plot_fft_f(1)