SYNOPSIS
osmocom_fft [options]DESCRIPTION
Spectrum BrowserOPTIONS
- -h, --help
- show this help message and exit
- -a ARGS, --args=ARGS
- Device args, [default=]
- -A ANTENNA, --antenna=ANTENNA
- Select RX antenna where appropriate
- -s SAMP_RATE, --samp-rate=SAMP_RATE
- Set sample rate (bandwidth), minimum by default
- -f FREQ, --center-freq=FREQ
- Set frequency to FREQ
- -c FREQ_CORR, --freq-corr=FREQ_CORR
- Set frequency correction (ppm)
- -g GAIN, --gain=GAIN
- Set gain in dB (default is midpoint)
- -W, --waterfall
- Enable waterfall display
- -S, --oscilloscope
- Enable oscilloscope display
- --avg-alpha=AVG_ALPHA
- Set fftsink averaging factor, default=[0.1]
- --averaging
- Enable fftsink averaging, default=[False]
- --ref-scale=REF_SCALE
- Set dBFS=0dB input value, default=[1.0]
- --fft-size=FFT_SIZE
- Set number of FFT bins [default=1024]
- --fft-rate=FFT_RATE
- Set FFT update rate, [default=30]
- -v, --verbose
- Use verbose console output [default=False]
Device specification
You can specify the source or sink device using a comma separated string of argument=value pairs. The always-up-to-date block documentation with examples is available right here.FCD Source
- Argument
- Notes
- fcd=<device-index>
- 0-based device identifier, optional
- device=hw:2
- overrides the audio device
- type=2
- selects the dongle type, 1 for Classic, 2 for Pro+
The "device" argument overrides the audio device used by the underlying driver to access the dongle's IQ sample stream.
The "type" argument selects the dongle type, 1 for Classic, 2 for Pro+.
OsmoSDR Source
- Argument
- Notes
- osmosdr=<device-index>
- 0-based device identifier
- buffers=<number-of-buffers>
- Default is 32
- buflen=<length-of-buffer>
- Default is 256kB, must be multiple of 512
RTL-SDR Source
- Argument
- Notes
- rtl=<device-index>
- 0-based device identifier OR serial number
- rtl_xtal=<frequency>
- Frequency (Hz) used for the RTL chip, accepts eng notation
- tuner_xtal=<frequency>
- Frequency (Hz) used for the tuner chip, accepts eng notation
- buffers=<number-of-buffers>
- Default is 32
- buflen=<length-of-buffer>
- Default is 256kB, must be multiple of 512
- direct_samp=0|1|2
- Enable direct sampling mode on the RTL chip. 0: Disable, 1: use I channel, 2: use Q channel
- offset_tune=0|1
- Enable offset tune mode for E4000 tuners
NOTE: use rtl_eeprom -s to program your own serial number to the device
NOTE: if you don't specify rtl_xtal/tuner_xtal, the underlying driver will use 28.0MHz
RTL-SDR TCP Source
- Argument
- Notes
- rtl_tcp=<hostname>:<port>
- hostname defaults to "localhost", port to "1234"
- psize=<payload-size>
- Default is 16384 bytes
- direct_samp=0|1|2
- Enable direct sampling mode on the RTL chip 0=Off, 1=I-ADC input enabled, 2=Q-ADC input enabled
- offset_tune=0|1
- Enable offset tune mode for E4000 tuners
Miri Source
- Argument
- Notes
- miri=<device-index>
- 0-based device identifier
- buffers=<number-of-buffers>
- Default is 32
UHD Source / Sink
Argument Notes- uhd
- Use this argument without a value
- nchan=<channel-count>
- For multichannel USRP configurations use the subdev parameter to specify stream mapping
- subdev=<subdev-spec>
- Examples: "A:0", "B:0", "A:0 B:0" when nchan=2. Refer original ettus documentation on this
- lo_offset=<frequency>
- Offset frequency in Hz, must be within daughterboard bandwidth. Accepts eng notation
Additional argument/value pairs will be passed to the underlying driver, for more information see specifying the subdevice and common device identifiers in the Ettus documentation.
bladeRF Source / Sink
- Argument
- Notes
- bladerf[=0]
- 0-based device identifier (optional)
- fw='/path/to/the/firmware.img'
- program MCU firmware from given file. usually not needed. power cycle required.
- fpga='/path/to/the/bitstream.rbf'
- load FPGA bitstream from given file. required only at first run at the moment.
HackRF Source / Sink
- Argument
- Notes
- hackrf
- Use this argument without a value
- buffers=<number-of-buffers>
- Default is 32
Only the first device found may be used at the moment because of libhackrf limitation.
Transmit support has been verified by using the crc-mmbTools DAB sdr transmitter.
IQ File Source
- Argument
- Notes
- file=<path-to-file-name>
- freq=<frequency>
-
Center frequency in Hz, accepts eng notation
- rate=<sampling-rate>
- Mandatory, in samples/s, accepts eng notation
- repeat=true|false
- Default is true
- throttle=true|false
- Throttle flow of samples, default is true
EXAMPLES
osmocom_fft -a rtl=0 -v -f 100e6 -s 2.4e6 -g 15
osmocom_fft -a hackrf -v
osmocom_fft -a uhd -v