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Analog Modulation PDF Print

Analog voice systems fall under two primary types:

  1. AM (Amplitude Modulation)
    Voice is used in the radio to change (modulate) the power output of a radio.
  2. FM (Frequency Modulation)
    Voice is used in the radio to change (modulate) the transmitted frequency of the radio.

Both modes are widely used by broadcast stations.

FM is the primary mode for public safety users. 

Advantages:

  • The equipment is less complex.
  • No encode/decode delay.

Disadvantages:

  • Transmissions are subject to "static" or signal breakup as signal strength becomes weak.
  • Transmissions are subject to environmental and atmospheric noise (expecially AM).
  • Encryption requires additional hardware and will decrease the effective range of the signal.
 
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