NFM Voice

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NFMNarrowband Frequency Modulation Voice
NFMvoice.jpg
Frequencies 27 MHzMegaHertz (MHz) 10^6 Hz27,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
27,000 kHzKiloHertz (kHz) 10^3 Hz
,162.4 MHzMegaHertz (MHz) 10^6 Hz162,400,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
162,400 kHzKiloHertz (kHz) 10^3 Hz
,470 MHzMegaHertz (MHz) 10^6 Hz470,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
470,000 kHzKiloHertz (kHz) 10^3 Hz
,864 MHzMegaHertz (MHz) 10^6 Hz864,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
864,000 kHzKiloHertz (kHz) 10^3 Hz
27,000 kHzKiloHertz (kHz) 10^3 Hz
27 MHzMegaHertz (MHz) 10^6 Hz
864,000 kHzKiloHertz (kHz) 10^3 Hz
864 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 27 MHzMegaHertz (MHz) 10^6 Hz27,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
27,000 kHzKiloHertz (kHz) 10^3 Hz
- 864 MHzMegaHertz (MHz) 10^6 Hz864,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
864,000 kHzKiloHertz (kHz) 10^3 Hz
Mode NFMNarrowband Frequency Modulation
Modulation FMFrequency Modulation
ACF
Bandwidth 5000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
,12500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
,30000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).30 kHzKiloHertz (kHz) 10^3 Hz
0.03 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
30 kHzKiloHertz (kHz) 10^3 Hz
0.03 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Used in analog walkie-talkies and communication systems.
I/Q Raw Recording
Audio Sample

Used in analog walkie-talkies and communication systems. In addition, old cordless phones and baby monitors transmit unencoded NFMNarrowband Frequency Modulation voice. These older devices are most commonly found in the 49.5 MHzMegaHertz (MHz) 10^6 Hz – 50 MHzMegaHertz (MHz) 10^6 Hz region. They can also be found in the 27 MHzMegaHertz (MHz) 10^6 Hz, 40 MHzMegaHertz (MHz) 10^6 Hz, and 864 MHzMegaHertz (MHz) 10^6 Hz regions.

Newer devices utilize the DECT protocol, which is harder to decode.

Frequencies[edit]

27 MHzMegaHertz (MHz) 10^6 Hz, 150-180, 430-470

Amateur: 145, 430-440 MHzMegaHertz (MHz) 10^6 Hz

NOAA Weather: 162.4 - 162.55 MHzMegaHertz (MHz) 10^6 Hz

PMR: 446 MHzMegaHertz (MHz) 10^6 Hz

Audio Samples[edit]

Other Examples
NOAA NFMNarrowband Frequency Modulation Weather

NFM Noaa.PNG

Decoding Software[edit]

GQRX, GnuRadio "nbfm receive", anything.

Video Examples[edit]

Additional Images[edit]