V1.01 (2025-06-23) - This kneeboard page shows most of the sound codes emitted by the Viggen RWR. It may come in handy to identify the source of a radar emission.

Changelog:
2025-06-10 - Initial Release
2025-06-23 - Fixed duration of Mirage 2000 scan signal

lHOW TO READ THIS PAGE:

Radar emissions are sorted by length, from shortest to longest.
Each tone is represented by a colour.
Scan tones are displayed in the top half of the page.
Lock and Track tones are displayed in the bottom half.

HOW TO IDENTIFY A RADAR EMISSION:

Start by measuring the entire loop duration, which includes the silent part.
If the loop duration is less than 5 seconds, look at the first "Scan" chart.
If the loop is longer, look at the second "Scan" chart.
Now, try to identify the sequence you're hearing, according to the estimated loop duration, the number of tones and their height.
If there is no silent part, look at the "Lock" and "Track" charts and try to recognize the frequency you're hearing in order to determine what is interested in you...
... but you'd better close that kneeboard and use your afterburner third stage to get away from here already!!!

EXAMPLES:
If you're hearing "doo-DEE-doo-DEE ---------------------------------------" and the whole loop lasts about 2 seconds, it's an F-16 pilot scanning the area.
If you're hearing "doo----------------------DEE----------------------" and the whole loop lasts 5 seconds, your are being scanned by a MiG-29 or a Su-27 variant.
If the tone you're hearing is a continuous and very high-pitch "DEEEEEEEEEEEEEEEEEE", you're being tracked by a SA-3 or ZSU-23-4 unit.