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Revision as of 09:43, 7 January 2018 by Geertivp (talk | contribs) (alternative amixer version)
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The RTL2832U & R820T is a software defined radio/tuner USB dongle capable of receiving 24 - 1766 MHz radio signals, including DVB-T.

You can use it with e.g. a Raspberry Pi or any other Debian based Linux to listen to FM radio.


Building from sources is not necessary any more...

apt-get install rtl-sdr

Configure amixer

Version 1

Set jack (analog) output:

amixer cset numid=3 1

Set HDMI output:

amixer cset numid=3 2

Set audio volume:

amixer sset "PCM" 90%

Version 2

amixer controls
numid=4,iface=MIXER,name='Master Playback Switch'
numid=3,iface=MIXER,name='Master Playback Volume'
numid=2,iface=MIXER,name='Capture Switch'
numid=1,iface=MIXER,name='Capture Volume'

Enable audio:

amixer cset numid=4 1

Set volume at 76%

amixer cset numid=3 50000


Simple mixer control 'Master',0
 Capabilities: pvolume pswitch pswitch-joined
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 65536
 Front Left: Playback 50020 [76%] [on]
 Front Right: Playback 50020 [76%] [on]

Test aplay

You should hear a kitten miaw...

aplay /usr/share/scratch/Media/Sounds/Animal/Kitten.wav

Listen to FM Radio

Tune into an FM radio station:

rtl_fm -f 91.7e6 -s 200000 -r 48000 |aplay -r 48000 -f S16_LE

Other applications

External links