Radar warning receiver

The War Thunder standard RWR display showing a Pulse-Doppler "track" on 5 o'clock.

A Radar Warning Receiver (RWR) is a system that informs the pilot about incoming radar radiation, allowing for proper action if needed. In game, the RWR varies a lot between models, but most of them are a clock display which shows the type of threat (search radar or tracking radar), the source and the direction.

Understanding the RWR

Note: Radar Warning Recievers are only capable of detecting certain bands. Therefore, it may not be able to give a warning for radars outside of the RWR's band range.

Basic function

The RWR warns the pilot about any outside radar that may be detecting, tracking or launching a missile at the user's aircraft, as long as the threat isn't in the RWR blindspots (often directly above or below)

If a radar is sending a single "ping" at you (a search radar is detecting you), the RWR will sound a short warning and show the direction it is coming from. RWR can show multiple pings at once from different directions and sources. If you hear a constant alarm and see a striped line coming from the ping towards the center of the RWR, a tracking radar has locked you and is constantly tracking your position (which usually precedes a missile launch). Finally, a faster alarm along with blinking warnings in the RWR indicate a missile launch, which requires inmediate action.

Some RWRs are unable of distinguishing between search radars and tracking radars, so if your RWR is one of them, instead of a constant alarm you may only be able to distinguish between the both by how frequently the ping updates (A constant tone that doesn't go away may indicate a tracking radar).

There may be lamps which indicate the type of radar that's detecting or tracking the aircraft, for example PD (Pulse-Doppler), A/D (Air Defence), AAA/AI (Anti-Aircraft Artillery/Airbone Radar) and much more, although the most dangerous of them all is CW which is the guidance method for most SAHR missiles.

Now, there are many types of RWR which vary a lot in function, which will be now explained in detail accordingly

RWR indicating a radar lock at 2 o'clock.

Standard RWR

This type of RWR is the one that's commonly found on most aircraft that carry one. They display the exact direction and the type of threat that's detecting the aircraft.

Many of them are capable of detecting tracking radars, and some can even detect if the threat has launched a missile, allowing for inmediate evasive action. More advanced RWRs may be able to show the vehicle that's triggering the RWR as long as they're inside the RWR's database.

Sectored RWR (SPO-10, SPO-15 and others)

SPO-10 RWR.

A soviet SPO-15 RWR.

This type of RWR doesn't display the exact direction of the detected threat, and instead only shows it in sectors. One of the most common RWRs that use sectors for displaying threats are the ones used by the MiG-21 and early MiG-23 variants, which only show 4 sectors. Each sector shows an approximation of the direction of the target, although it has its limitations. In order to show that a target is directly ahead, the RWR has to light up 2 sectors that look forwards, and if a target is directly behind, it has to light up 2 sectors that look backwards. This could be easily confused for two different threats that are triggering the RWR system.

Semi-Directional RWR (SPO-2)

Unique to the Su-7B family of jets and the MiG-19S, this RWR only warns about radiation that's coming from behind as it only has a single antenna. Historically, this RWR was designed to warn the pilot about an enemy that was using the rangefinder radar behind the aircraft, but in-game it gives proper warnings up to 40km away as long as the radiation is an I Band type coming from the rear. Note that this RWR lacks tracking capability.

RWR with no tracking capability (AN/ALR-45, AN/APR-25, f95, SPO-2, APP-73 and others)

These RWRs function like normal with a key difference: If a plane locks the aircraft, there won't be a special text and audio warning, forcing the user to be more attentive to the RWR display and sounds.

However, these RWRs can still show the difference between a search and a tracking radar, as once the plane is being tracked, the search ping extends into a constant tone that won't go away, along with the ping icon refusing to fade away.

Note that even if the RWR lacks tracking capability, it may still be able to give proper missile launch warnings if the RWR has that capability.

Symbols

• AI (Air-to-Air) - Fighter
• PD (Pulse Doppler) - Pulse Doppler Radars
• A/D (Air Defense) - Air Defense System
• SAM (Surface-to-Air Missile) - SAM System
• AAA (Anti-Aircraft Artillery) - Anti-Aircraft Artillery

List of RWR systems

RWR systems
	Name	Band									Track	Equipped by
		C	D	E	F	G	H	I	J	K - M
	ALR-400											EC-665 Tiger HAD EC-665 Tiger HAP EC-665 Tiger UHT
	AN/ALQ-73											F-104S.ASA
	AN/ALR-45(V)											A-6E TRAM F-14A Early
	AN/ALR-56M											F-16D Barak II F-16A F-16AJ F-16C Netz ␗F-16A MLU
	AN/ALR-67(V)2											AV-8C F-14B ▄AV-8B Plus
	AN/ALR-68(V)											◄F-4F
	AN/ALR-69											A-10A A-10A Late F-16A ADF ▄F-16A ADF
	AN/APR-25											A-7E F-4C Phantom II F-4J Phantom II F-4S Phantom II F-5A F-5C F-100D F-104C F-104S F-105D Jaguar A Kfir Canard ␗F-5A ␗F-100A ␗F-104G ▄F-100D ▄F-104G ▄F-104S TAF ◄F-104G
	AN/APR-27											F8U-2 F-8E
	AN/APR-32											F-4J(UK) Phantom II
	AN/APR-36											A-4E Early A-7D A-7K Ayit Buccaneer S.1 F-1 F-4EJ ADTW F-4EJ Phantom II F-5E Sea Vixen F.A.W. Mk.2 ◄F-4F Early ◌Hunter F.58 A-4E A-4E Early (M) A-4H
	AN/APR-39											A129CBT A-129 International (p) A.109EOA-2 AH Mk.1 Apache AH-1F AH-1S AH-1S Kisarazu AH-1Z AH-6M AH-64A AH-64A (GR) AH-64D AH-64DJP AHS BO 105 CB-2 BO 105 PAH-1 BO 105 PAH-1A1 G-LYNX HKP9A Lynx AH.Mk.1 Peten Rooivalk Mk1F CSH Saraph Tzefa B Tzefa D/E YAH-64 ▃AH-64A Peten ▅AH-1E AH-64A Peten
	AN/APR-39A(V)1											OH-58D ␗OH-58D
	AN/APR-46										?	F-4E Phantom II Kurnass Kurnass 2000 ␗F-5E
	APP F9/5											A32A A32A Röd Adam
	APP-27											AJ37 AJS37
	APP-73											JA37C JA37D
	ARI 18223											Harrier GR.3 Jaguar GR.1 Jaguar GR.1A
	ARI 18228											Buccaneer S.2 Phantom FG.1 Phantom FGR.2 Sea Harrier FRS.1 Sea Harrier FRS.1 (e)
	ARI 18241/1											Tornado ADV Tornado F.3
	ARI 23284											Tornado GR.1 ▄Tornado IDS (1995) ◄Tornado IDS MFG ◄Tornado IDS ASSTA1
	ARI 23333/1											Harrier GR.7
	J/APR-1											F-104J
	J/APR-6											F-4EJ Kai Phantom II
	KJ8602											A-5C J-7E
	KJ8602A											J-8F
	Mirage Detecteur											Mirage 5F Mirage F1C Mirage F1C-200 Mirage IIIE Shahak
	RW-30										?	Q-5L
	RWR										?	Z-9W Z-9WA Z-10 Z-19 Z-19E
	SERVAL											Mirage 2000-5F Mirage 2000C-S5 Mirage 2000D-R1
	SPO-2											Q-5A Su-7B Su-7BKL Su-7BMK ◄MiG-21 SPS-K ◊MiG-19S
	SPO-10											J-8B MiG-21S (R-13-300) MiG-21SMT MiG-21bis MiG-23M Su-17M2 Yak-38 Yak-38M ▄MiG-21bis ◊MiG-21 "Lazur-M" ◊MiG-21MF ◊MiG-21bis-SAU ◊MiG-23BN ◊MiG-23MF
	SPO-15											Ka-50 Mi-24P Mi-24V Mi-28A Mi-28N MiG-23ML MiG-23MLD MiG-27K MiG-27M MiG-29 Su-17M4 Su-22M3 Su-25 Su-25K Yak-141 ▂Mi-24D ◄Mi-24P HFS 80 ◊Mi-24P ◊MiG-23MLA ◊MiG-29 ◊Su-22M4 ◊Su-22UM3K ◔Mi-24D
	SPO-15LM											Mi-35M Su-25BM ◔Mi-24P ◔Mi-24V
	SPO-150											Ka-52 Mi-28NM MiG-29SMT Su-25T Su-39
	SPS-200											Kfir C.2 Kfir C.7
	Sherloc											Mirage F1CT Super Etendard
	Type 930-4										?	J-7D

External Links

• [DevBlog] Updated RWR — More realism and features!