July 24, 2020

[Note] SDR on Ubuntu


SDR = Software Defined Radio, see https://en.wikipedia.org/wiki/Software-defined_radio

There are many things it can do, I'm mainly interested in doing:
  • For fun: track air traffic, listen to SW
  • For tech: using SDR as a true random number generator
  • Useful: get satellite weather images


Again, moving to Ubuntu requires install linux s/w.  Started with Gqrx for now.  Need to do more for other features (air traffic, satellite images).

$ sudo apt-get install rtl-sdr gnuradio gqrx-sdr

$ sudo rmmod dvb_usb_rtl28xxu
$ vi /etc/modprobe.d/blacklist-rtlsdr.conf
blacklist dvb_usb_rtl28xxu


Test it

$ rtl_test
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33
.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.

Info: This tool will continuously read from the device, and report if
samples get lost. If you observe no further output, everything is fine.

Reading samples in async mode...
Allocating 15 zero-copy buffers
lost at least 24 bytes


^CSignal caught, exiting!

User cancel, exiting...
Samples per million lost (minimum): 0



ZR6AIC: How to install Gqrx SDR software on Linux using ...

(borrowed the image)

REFERENCE

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