From MechWarrior: Living Legends Wiki
(Redirected from Passive Radar)
Jump to: navigation, search

Radar is a common term used to describe a Multiple Sensor Suite commonly found on units in the BattleTech Universe. Radar is the primary method of ranged non-visual unit detection and has two modes of operation.

Radar Modes

Radar in "passive" mode; note the blue 300m range circle in center

Vehicles can be in active or passive radar mode, affecting detection of and detectability by enemy units. The radar mode can be toggled by pressing the [R] key.

Active Radar

Active radar works by sending out signals to detect enemy vehicles up to 1000m away. This function also boosts the radar cross section of any unit currently in active radar mode, making it much easier to detect. Active radar can be enhanced by utilizing an active radar probe, which can extend the detection radius by up to 400m. Active radar mode is also required to establish missile locks, to enable missiles to seek towards an active NARC or TAG, and to receive and share C3 radar data.

Passive Radar

Passive radar functions by only listening for the signals sent out by other units, which drops the radar range to 300 meters but also makes unit much more difficult to detect. Passive radar cannot be enhanced in any way, and other than the reduction in range and radar visibility, it functions identically to active radar. Note that hostile vehicles using passive radar, as well as those in active radar mode but shielded by ECM, are undetectable in passive radar mode.

Important Note: Since passive radar mode also disables any electronic or radar equipment (GECM, AECM, BAP, BHP) the effects do not stack!

Battle Armor radar is very weak compared to the normal suite, having a detection range of only 300m, but it also makes Battle armor much more difficult to detect on Radar.

Detection range

Radar detection depends on several factors.

  • Units running an active radar can be detected from the greatest range.
  • Units running a passive radar have a shorter detection range (-750m for standard radar and -500m for C3 radar).
  • Units protected by electronic countermeasures (GECM and AECM) have reduced detection ranges
  • Powered down units can only be detected by enemies equipped with an active BAP or BHP.
  • Terrain can be used as a cover to lower the detailed identification range.
  • Radar data can be shared between multiple friendly units with C3, making C3-equipped 'Mechs excellent scouts.

Detected Object
Detection Equipment Battle Armor Battle Armor
Powered Down Passive Radar (Std) Passive Radar (C3) Passive Radar (Std) AECM* Passive Radar (C3)
Active Radar Active Radar
Active Radar
Active Radar
Active Radar
Battle Armor Radar 150m Undetectable 350m 350m 350m Undetectable Undetectable 350m 350m 350m Undetectable Undetectable
Active Radar 150m Undetectable Undetectable 250m 500m Undetectable Undetectable 1000m 500m 350m 300m Undetectable
Passive Radar 150m Undetectable Undetectable Undetectable Undetectable Undetectable Undetectable 300m Undetectable Undetectable Undetectable Undetectable
Active Radar + BAP 250m Undetectable 100m 450m 700m Undetectable Undetectable 1200m 700m 550m 500m Undetectable
Active Radar + BHP 350m Undetectable 300m 650m 900m Undetectable 200m 1400m 900m 750m 700m 200m
AECM* = Under the effect of a friendly AECM.


The moment an asset's heat level increases to over the yellow line, they are equally visible to having no radar protection and running in Active Radar mode, regardless of sensor packages such as GECM. Furthermore, the blip it produces on the map is visible to *all* assets regardless of range.

See Also

  • GECM - Reduces detectability by 500 meters and increases enemy missile lock-on time.
  • Stealth_Armor - Reduces detectability by an additional 150 meters on top of GECM.
  • AECM - Reduces detectability of nearby friendly units within 300m of the bearer by 700 meters and also increases enemy missile lock-on time against affected friendly units. The bearer is unaffected by his own AECM.
    • Note: The bearer has to remain in active radar mode in order for the AECM to be effective.
  • BAP - Expands detection range by +200 meters, or +100 for BA.
  • BHP - Expands detection range by +400 meters, or +200 for BA.
  • C3 - Allows sharing Radar data, when passive reduces detection range by -500 instead of the usual -750.