TM 1-1520-253-10 
CONTROL  FUNCTION 
TEST  When momentarily depressed 
initiates self-test con.dence check 
(except for antennas and antenna 
receiver cabling). 
MODE  Selects synthetic voice message 
format only. MODE ONE (UP) 
selects normal voice message 
format. MODE TWO (DOWN) 
selects test/abbreviated voice 
message format. 
AUDIO  Controls volume to the interphone 
system. 
Direction/Display  Shows alphanumeric symbology on 
(Scope IP 1150A)  a bearing for each processed 
emitter signal. Does not indicate 
any range data. 
MA indicator  Not used. 
MA switch  Not used. 
BRIL control  Varies brilliance of CRT. 

To prevent damage to the receiver detec-tor crystals, assure that the AN/APR-39A(V)-1 antennas are at least 60 yards from active ground radar antennas or 6 yards from active airborne radar anten-nas. Allow an extra margin for new, un-usual, or high power emitters.
Excessive indicator display brightness may damage CRT.
4.2.2 Modes of Operation.
a. Self test mode.
(1) After power up, the AN/APR-39A(V)1 synthetic voice will announce 9APR-39 POWER UP9 and the (+) symbol will stabilize in the center of the CRT. Self test should be initiated after approximately one minute. Self test can be performed in MODE ONE or MODE TWO.In MODE ONE the synthetic voice will announce 9SELF TEST SET VOLUME, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 9. In MODE TWO the synthetic voice will announce 9SELF TEST SET VOLUME, 5, 4, 3, 2, 19.
(2)
The CRT will display speci.c software version numbers i.e., operational .ight program (OFP) at the 12 o’clock position and the emitter identi.cation data (EID) at the 6 o’clock position.

(3)
After the software version numbers have been dis-played the test sequence checks the receivers. A good vi-sual self test will show two triangles, one at the 6 o’clock and one at 12 o’clock position on the CRT. Snow.ake sym-bols (*) will appear at the 2, 4, 8, and 10 o’clock positions and will .ash if the AN/AVR-2 laser detecting set is not installed. This is a normal indication and does not effect system performance.

(4)
A good self test (no faults detected) ends with the message 9APR-39 OPERATIONAL9. A bad self test (faults detected) ends with the 9APR-39 FAILURE9.

b.
MODE ONE operation. Selecting MODE ONE the operator will hear all the normal synthetic voice audio when an emitter has been processed e. g., the AN/APR-39A(V)1 will announce; 9SA, S-18 12 O’CLOCK TRACKING9. Se-lection of this mode does not have any effect on emitters received, processed or displayed, it only affects synthetic voice audio.

c.
MODE TWO operation. Selecting MODE TWO the operator will hear an abbreviated synthetic voice audio e. g., the AN/APR-39A(V)1 will announce; 9MISSILE 12 O’CLOCK TRACKING9.

4.2.3 Function.
a.
The radar signal detecting set (RSDS) receives, pro-cesses and displays pulse type signals operating in the C-D and H-M radio frequency bands. The emitters that it pro-cesses and displays are derived from the EID contained in the user data module (UDM) that is inserted in the top of the digital processor. In normal circumstances the processor is classi.ed con.dential if a classi.ed UDM is installed.

b.
The UDM contains the electronic warfare threat data that makes up the speci.c library for a speci.c mission(s) or a geographical location (it is theaterized). When a match of the electronic warfare data occurs the processor gener-ates the appropriate threat symbology and synthetic audio. It is important therefore that the correct theaterized EID and UDM are installed for the mission or geographic loca-tion.
　
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