Flight Manual: Bookmark J-35OE Draken 1.12024-04-04

Radar warning receiver (RWR)

The Austrian J-35OE MkII was fitted with an IP-1310/ALR-45 Radar Warning Reciever (RWR) system for detecting and identifying radar-emitting potential threats. Swedish Drakens were not equipped with RWR, as they would normally operate inside the range of Swedish military radar and thus had no need of on-board threat detection.

The simulated RWR system in this version is not really an RWR, as it does not sense whether an aircraft or ground station is emitting radar signals or not. However, it can differ between different kinds of objects and thus simulates some of the original functionality.

The RWR functions, symbology and control panel included here are not authentic, since I have no documentation for the ALR-45 system. The simulated functions in this version are roughly based on the AN/ALR-87 system used in Mirage III.

IP1310/ALR display

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Fig. 68 - IP1310 RWR Indicator

The indicator shows a top-view of the airspace around you with your own aircraft in the center, nose pointing upwards. Detected radar emitters are placed in the outer circle, inner circle, or the center of the display depending on their threat value which is calculated from distance and the type of emitter.

The closest threat is framed with a diamond symbol. The newest threat has an arc over the symbol.

The symbols "jump" between the inner/outer circles – their placement on the screen is not proportional to the distance.

There is no way to detect radars in Prepar3D, so the display will simply show all AI and multiplayer aircraft within the search range. AI boats are also shown if UNKNOWN is selected.

The stock AI fighter aircraft in Prepar3D are identified with 27 or 29 depending on the type. Bookmark Draken 35J and 35OE multiplayer aircraft are shown as 35. All other vehicles are simply indicated with U (unknown). Aircraft are displayed with a caret above the letter.

Adding more aircraft types

This is an advanced customization that requires that you are familiar with editing XML gauge files in Prepar3D or Flight Simulator.

You can customize the RWR to detect other aircraft types based on the title field in their respective Aircraft.cfg and display them with different letters or symbols on the RWR display.

Open the RWR gauge file panel/rwr/rwr_p3d.xml in a text editor.
Add your customizations between the start and end comments at line #151.

EXAMPLE: To have all aircraft that contain Orion in their title to be displayed with the letter O, add the following XML code after line #151:

%{else}%((@S:TITLE,string) 'Orion' sstr ! )%{if}O

RWR Control Panel

The RWR control panel is located behind the throttle console on the left side of the cockpit.

Use Shift-2 to open the 2D version of the panel.

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Fig. 69 - RWR Control Panel

MODE	OPEN = Show all emitters within range (max. 10) PRIORITY = Show only the 5 highest threats (SEARCH disabled)
SEARCH	S = Show ground radars (PRIORITY DISABLED)
HANDOFF	Shift priority to next threat (not functional)
LAUNCH	Indicator light: Missile launched (not functional)
ALTITUDE	ALT = Suppress emitters on ground (use at high altitude) ALT LOW = Show ground emitters
T/TGT SEP	TGT SEP = Separate stacked symbols (except highest threat) to unclutter display
SYS TEST	Run a short system test sequence
UNKNOWN (boat)	U = Show boats and unknown emitters
ACT/PWR	Indicator light: Emitters detected
POWER	Push to power on the RWR system SYSTEM POWER = RWR is activated