Radio Bandwidth Frequency Offset

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Notation

The new APCO standard for FM is Narrow Band +/-2.5 KHz. For amateur use set the radio to Wide Band +/- 5 KHz.

The new Land Mobile Radio standards of "wideband" vs "narrowband" refer to the bandwidth of the signal. Older analog wideband FM business band signals are 25 kHz wide. The new mandated narrowband signals are only 12.5 kHz wide.

  • super or ultra narrow (2.5kHz deviation)
  • narrow, and regular narrow (5kHz) wide.
  • two way wide is 15kHz
  • amateur wide is 15kHz
  • amateur narrow is 5kHz
  • commercial super FM narrow (2.5kHz) narrow and 5kHz standard narrow.
  • normal 2 meter FM is considered wide band at about 5khz for amateur use.
  • wide/narrow setting on newer ham radios: 25KHz (wide) or 12.5KHz (narrow).
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