gqrx

Overview

  • multi-platform, open source SDR application

  • install on linux

sudo apt install gqrx

  • Shows waterfall display as well as FFT display. Easier to detect signal transmission

  • Easy to record samples to disk

FM Radio

  • launch with 

gqrx --edit
# select the correct device

  • in my case im using a RTL device so i select that one

  • ensure you tune to the right frequency (remember its in kHZ not MHZ)

  • select WFM (stereo)

  • Can see the red in the waterfall display meaning there is a strong signal present

  • can bookmark frequency for easy return finding in the future

Bands around FM

  • you might notice two bands around strong radio signals as seen below

  • i believe this is to define the stations, however i am unsure. seems to make sense

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