FM Broadcast Radio

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FM Broadcast Radio
Broadcast FM.jpg
Frequencies 65 MHz,108 MHz
Frequency Range 65 MHz - 108 MHz
Mode WFM
Modulation FM
ACF
Emission Designator
Bandwidth 38 kHz,108 kHz,118 kHz,184 kHz,200 kHz
Location Worldwide
Short Description Commercial Broadcast FM 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

IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. Samples[edit]

Here are 5 IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. 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]