FM Broadcast Radio

From Signal Identification Wiki
Jump to: navigation, search
FMFrequency Modulation Broadcast Radio
Broadcast FM.jpg
Frequencies 65 MHzMegaHertz (MHz) 10^6 Hz65,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
65,000 kHzKiloHertz (kHz) 10^3 Hz
,108 MHzMegaHertz (MHz) 10^6 Hz108,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
108,000 kHzKiloHertz (kHz) 10^3 Hz
65,000 kHzKiloHertz (kHz) 10^3 Hz
65 MHzMegaHertz (MHz) 10^6 Hz
108,000 kHzKiloHertz (kHz) 10^3 Hz
108 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 65 MHzMegaHertz (MHz) 10^6 Hz65,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
65,000 kHzKiloHertz (kHz) 10^3 Hz
- 108 MHzMegaHertz (MHz) 10^6 Hz108,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
108,000 kHzKiloHertz (kHz) 10^3 Hz
Mode WFMWideband Frequency Modulation
Modulation FMFrequency Modulation
ACFAutoCorrelation Function
Bandwidth 38 kHzKiloHertz (kHz) 10^3 Hz38,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.038 MHzMegaHertz (MHz) 10^6 Hz
,108 kHzKiloHertz (kHz) 10^3 Hz108,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.108 MHzMegaHertz (MHz) 10^6 Hz
,118 kHzKiloHertz (kHz) 10^3 Hz118,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.118 MHzMegaHertz (MHz) 10^6 Hz
,184 kHzKiloHertz (kHz) 10^3 Hz184,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.184 MHzMegaHertz (MHz) 10^6 Hz
,200 kHzKiloHertz (kHz) 10^3 Hz200,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.2 MHzMegaHertz (MHz) 10^6 Hz
38 kHzKiloHertz (kHz) 10^3 Hz
0.038 MHzMegaHertz (MHz) 10^6 Hz
200 kHzKiloHertz (kHz) 10^3 Hz
0.2 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Commercial Broadcast FMFrequency Modulation radio stations. Used for the broadcast of many different radio programs, including music, news, sports, weather, and talk shows.
I/Q Raw Recording Download file
Audio Sample
Commercial Broadcast FMFrequency Modulation radio stations. Used for the broadcast of many different radio programs, including music, news, sports, weather, and talk shows.

Bandwidth for Mono FMFrequency Modulation is 19 kHzKiloHertz (kHz) 10^3 Hz, with a stereo stream it raises up to 54 kHzKiloHertz (kHz) 10^3 Hz, if there is RDS the bandwidth is 59 kHzKiloHertz (kHz) 10^3 Hz, and if DARC is present it is 92 kHzKiloHertz (kHz) 10^3 Hz.

There are a number of variations on the subcarriers that are placed on some FMFrequency Modulation Broadcast channels. RDS (RBDS in North America), and DARC are some of the data-based subcarriers used to transmit information alongside the FMFrequency Modulation broadcast. The information includes station name, details of current programming, alerts, traffic information, and more. Broadcasting in stereo FMFrequency Modulation also uses subcarriers for left and right channels.

In addition, in North America, HD Radio by iBiquity (Now part of DTS) in-band on-channel (IBOCIn-Band On-Channel (IBOC) is a hybrid method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency.) digital radio technology is broadcast on the outer sidebands of some FMFrequency Modulation radio stations. They have a distinctive look, two plateaus flanking the main FMFrequency Modulation analog signal.


North America[edit]

Sidebands[edit]

Here is a diagram showing the various subcarriers that exist on North American FMFrequency Modulation Radio Broadcasts:

RDS vs DirectBand FM-spectrum2.png

And this is a MPX extracted sample from a radio station in the United States for comparison:

PrevMPXWFM.jpg

IQ Samples[edit]

Here are 5 IQ samples of the MPX Multiplexed FMFrequency Modulation spectrum.

Frequencies[edit]

Common – 87.5 to 108 MHzMegaHertz (MHz) 10^6 Hz

OIRT – 65 MHzMegaHertz (MHz) 10^6 Hz to 74 MHzMegaHertz (MHz) 10^6 Hz

Japan – 76 MHzMegaHertz (MHz) 10^6 Hz to 90 MHzMegaHertz (MHz) 10^6 Hz

Subcarriers[edit]

Data Subcarriers Stereo FMFrequency Modulation Pilots
Subcarriers fmbroadcast.jpg
Stereo left right fmbroadcast.jpg

Decoding Software[edit]

Can be decoded in most SDR spectrum analyzer clients.

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]