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2 Selects terse/abbreviated voice message format.
AUDIO Adjusts volume to the intercommunications system.
4.38.1 AN/APR-39(V)1 Operating Procedures. The 2. BRIL - Adjust as desired for best indicator
procedure for turning on and off the RW equipment is display of + symbol.
as follows:
To prevent damage to the receiver
detector crystals, assure that the
radar warning set antennas are at
least 60 yards from active ground
radar antennas or 6 yards from active
airborne radar antennas. Allow
an extra margin for new, unusual,
or high power emitters.
Excessive indicator display brightness
may damage the CRT. Set
BRIL control for readable display.
3. MODE switch - Select for desired synthetic
voice message format.
4. TEST - Press pushbutton to start system selftest.
5. AUDIO control - Adjust volume as desired.
1. Equipment on. PWR switch - ON. Listen
for synthetic voice message - APR 39 POWER
UP. Plus (+) sign will appear and stabilize
in center of CRT.
6. Equipment off. PWR switch - OFF. (Pull
PWR switch handle out to disengage lock.)
Change 5 4-75
TM 1-1520-238-10
4.38.2 AN/APR-39A(V)1 Radar Warning Display Controls.
The operating controls of the RW display, located
on the right side of the pilot instrument panel (fig
2-9 and 4-24), are described in table 4-26. The display
shows the + symbol.
4.38.3 ANIAPR-39A(V)1 Operation Modes. The RW
set may be operated in either MODE 1 or MODE 2.
The RW set receives 28 vdc from the emergency dc bus
through the RDR WARN circuit breaker on the pilot
overhead circuit breaker panel. The RW set is not monitored
by FD/LS.
a. MODE 1 Operation. By selecting MODE 1 normal
synthetic voice messages will be heard when an
emitter has been processed (ie. RW will announce; SA,
SA-8 TWELVE O’CLOCK TRACKING). Selection of
this mode does not have any effect on emitters received,
processed, or displayed. It only affects synthetic voice
audio.
b. MODE 2 Operation. By selecting MODE 2
terse or abbreviated synthetic voice messages will be
heard (ie. RW will announce; MISSILE, MISSILE
TWELVE O’CLOCK TRACKING).
Symbol generation and position relative to the center of
the RW display shows threat lethality. It does not show
or represent any lethality of range but of condition/
mode of the emitter. Highest priority threats (most lethal)
are shown nearest the center. Each symbol defines
a generic threat type. The definition of what the
symbols mean is classified. The complete set of symbols
and definitions are contained in TM 11-5841-294-30-2.
a. Self-test procedures are as follows:
1. PWR switch - ON. Listen for synthetic voice
message - APR 39 POWER UP.
2. MODE switch - 1 or 2 position.
MODE 1 provides long count for self-test.
MODE 2 provides short count for self-test,
Table 4-26. AN/APR-39A(V)1 Radar Warning Display (CRT) Control/Indicator Functions
Figure 4-24. Radar Warning Display
4.38.4 AN/APR-39A(V)1 Self-Test Operation. Provides
a GO/NO-GO test of system functions. Self-test
can be run at anytime. The complete self-test runs in
less than 30 seconds. When installed, the AN/
AVR-2A(V)1 laser detecting set is tested simultaneously
when the AN/APR-39A(V)1 radar warning system is
tested.
Control/Indicator
BRIL Control
MA Indicator
NIGHT/DAY
Switch
Function
Adjust CRT display brightness.
Not Used.
Not Used.
4-76 Change 5
NOTE
TM 1-1520-238-10
3. TEST pushbutton - Press
a. AUDIO control - Adjust as desired during
long or short count.
b. Listen for synthetic voice long or short
count. SELF-TEST SET VOLUME 1, 2,
3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
c. The RW display will show specific numbers,
operational flight program (OFP) at
the twelve o’clock position and the emitter
identification data (EID) at the six o’clock
position (fig 4-25).
OFP and EID numbers should be correct
for mission or geographical location.
d. The RW display will then show a RW receivers
check. For a good self-test the RW
display will show two triangles with
slashes at the six and twelve o’clock positions
(fig 4-26). Snowflakes will appear at
the two, four, eight, and ten o’clock positions.
All will flash if the laser detecting
set is not installed and OFP is lower than
23.9. Otherwise, snowflakes will be
steady. This is a normal indication and
does not affect RW system performance. If
the laser detecting set is installed a good
self-test will display a steady snowflake in
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