[BUG] no sound in MP3 file

[kiricheglov]

• RTLSDR-Airband version you are using (stable release number or branch/commit): 4.1.1

  • make options used to build the program: cmake CMakeLists.txt -DNFM=ON -DPULSEAUDIO=ON -DMIRISDR=OFF -DSOAPYSDR=OFF -DRTLSDR=ON

  • Hardware platform (eg. x86_64, Raspberry Pi v4): RPi v4

  • Operating system name and version: Debian 11, kernel 6.1.21

What happened? I wanted to record the sound of a radio at a frequency of 102.9 MHz with modulation NFM, but the script instead of the speaker's voice records incomprehensible noise, the frequency and modulation are exactly correct

What you expected to happen? I expected in .mp3 file hear the speaker's voice

Steps to Reproduce sudo rtl_airband -f -c rtl_airband.conf

Additional context Add any other relevant information about the problem here.

Your rtl_airband.conf file Remove passwords, server addresses and other private information.

devices: ( { type = "rtlsdr"; index = 0; gain = 38.6 centerfreq = 125.0 channels: ( { freq = 124.0; modulation = "am"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_1"; append = true; } ); }, { freq = 102.9; modulation = "nfm"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_2"; append = true; } ); }, { freq = 129.5; modulation = "am"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_3"; append = true; } ); }, { freq = 133.1; modulation = "am"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_4"; append = true; } ); }, { freq = 139.3; modulation = "am"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_5"; append = true; } ); }, { freq = 124.45; modulation = "am"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_6"; append = true; } ); }, { freq = 130.75; modulation = "am"; outputs: ( { type = "file"; directory = "/home/rootmalina"; filename_template = "channel_7"; append = true; } ); } ); } );

[SullivanChrisJ]

102.9 MHz would be a commercial FM station, with a bandwidth of about 180 kHz. That isn't NFM (narrowband FM) which is more like 16 kHz.