4.38 RADAR WARNING SYSTEM AN/APR-39A(V)1.
The radar warning (RW) system provides visual and aural
warnings of radar reception. This is done by receiving,
processing, and displaying potential threats in the radio
frequency (RF) environment. Potential threats are dis-
played as symbols on the RW display and announced
over the intercommunication system. The emitters that it
displays are derived from the emitter identification data
(EID) contained in the user data module (UDM) that is in-
serted in the top of the digital processor. The UDM con-
tains the electronic warfare threat data that goes to make
up the specific library for a specific mission or geographi-
cal location. When a match of the electronic warfare data
occurs the processor generates the appropriate threat
symbology and synthetic audio. The operating controls
and indicators of the RW control panel (fig 4-20) are de-
scribed in table 4-25. When installed, the AN/AVR-2A(V)1
laser detecting set provides early warning against laser
threats. In the event of simultaneous warnings, one from
the radar warning and one from the laser detecting set,
the laser warning signals have priority. Refer to paragraph
AN/APR-39A(V)1 Radar Warning System Control/Indicator Functions
Turns set on. Listen for synthetic voice message APR 39 POWER UP. Plus (+) sign
will appear and stabilize in center of CRT.
Turns set off.
When momentarily depressed initiates self-test confidence check except for antennas
and antenna receiver cabling.
Selects normal voice message format.
Selects terse/abbreviated voice message format.
Adjusts volume to the intercommunications system.
4.38.1 AN/APR-39A(V)1 Operating Procedures.
procedure for turning on and off the RW equipment is as
To prevent damage to the receiver de-
tector crystals, assure that the radar
warning set antennas are at least 60
yards from active ground radar anten-
nas or 6 yards from active airborne ra-
dar antennas. Allow an extra margin
for new, unusual, or high power emit-
Excessive indicator display bright-
ness may damage the CRT. Set BRIL
control for readable display.
1. Equipment on.
PWR switch ON. Listen for
synthetic voice message APR 39 POWER UP.
Plus (+) sign will appear and stabilize in center
2. BRIL Adjust as desired for best indicator dis-
play of + symbol.
3. MODE switch Select for desired synthetic
voice message format.
4. TEST Press pushbutton to start system self-
5. AUDIO control Adjust volume as desired.
6. Equipment off.
PWR switch OFF. (Pull PWR
switch handle out to disengage lock.)