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