AN/ALR-67 RWR Radar Waning Receiver

1. Radar Warning System

1.4. Audio Warnings

Certain sounds are used to warn the pilot of threats. For example, if a new radar source is detected or a source changes to a more dangerous status, a warning tone is played.
If a source disappears or the threat decreases, no tone is played.

We will explain these sounds here:

  • Status Change (StatusChange)
    • Single 455hz tone with a duration of 0.335 seconds
    • Shows the following:
      • New Radar Source
      • A radar source was moved from the safe to the dangerous zone
      • A radar source was moved from the dangerous to the critical zone
      • RWR BIT error
    • Example:
  • New Plane (Waterfall)
    • Sequence of four tones in the following order. 550hz, 520hz, 490hz, 470hz. Each tone has a length of 0.083 seconds. The total length is 0.335 seconds.
    • Played when a radar of an aircraft has been added
    • Example:
  • Radar Uplink (Missile Alert)
    • A continuous tone that changes between 455hz and 555hz. Each tone has a duration of 0.25 seconds.
    • Played when a station locks onto you
    • Example:
  • Missile Approach (MissileLaunch)
    • A continuous tone that changes between 455hz and 555hz. But now the tone changes faster (only 0.1 seconds) than with radar activation.
    • Example:

Source: https://forums.eagle.ru/showpost.php?p=3347570&postcount=7