(b.) MIC. Enables either control
wheel POS IDENT switch to activate transmission
of ident signal from transponder.
(c.) OUT. Disallows outgoing signal.
(10.)
MODE 4 reply indicator light. Illumi-
nates to indicate a reply has been made to a valid
Mode 4 interrogation.
(11.)
MODE 4 AUDIO OUT switch. Selects
monitor mode for mode 4 operation.
(a.)
AUDIO. Enables sound and sight
monitoring of mode 4 operation.
(b.) LIGHT. Enables monitoring
REPLY indicator for mode 4 operation.
mode.
(c.) OUT.
Deactivates
monitor
(12.) MODE 3/A code selectors. Select
desired reply codes for mode 3/A operation.
(13.)
MODE 1 code selectors. Select desired
reply codes for mode 1 operation.
(14.) MODE 4 TEST-ON-OUT switch.
Selects test mode of Mode 4 operation.
(a.) TEST. Activates built-in-test of
mode 4 operation.
tion.
(b.)
ON. Activates mode 4 operation.
(c.) OUT. Disables mode 4 opera-
(15.) MODE 4 code control. Selects preset
mode 4 code.
(16.) M-C, M-3A, M-2, and M-1 switches.
Select test or reply mode of respective codes.
(a.) TEST. Activates self-test of
selected code. Transponder can also reply
(b.) ON. Activates normal operation.
(c.) OUT. Deactivates operation of
selected code.
(17.)
MODE 2 code selectors. Select desired
reply codes for Mode 2 operation. The cover over
mode select switches must be slid forward to display
the selected mode 2 code.
(18.) POS IDENT pushbutton (control
wheels, jig. 2-17). When pressed, activates transpon-
der identification reply.
TM 55-1510-221-10
c.
Transponder - Normal Operation.
(1.)
Turn-on procedure: MASTER switch -
STBY. Depending on the type of receiver installed,
the TEST/MON NO GO indicator may illuminate.
Disregard this signal.
(2.) Test procedure:
NOTE
Make no checks with the master switch in
EMER, or with M-3/A codes 7600 or
7700 without first obtaining authorization
from the interrogating station(s).
1.
2.
3.
4.
5.
6.
7.
8.
9.
Allow set two minutes to warm
up.
Select codes assigned for use in
modes 1 and 3/A by depressing
and releasing the pushbutton for
each switch until the desired
number appears in the proper
window.
Lamp indicators - Operate press-
to-test feature.
M-1 switch -
Hold in TEST.
Observe that no indicator lights
illuminate.
M-1 switch - Return to ON.
Repeat steps 4 and 5 for the M-2,
M-3/A and M-C mode switches.
MASTER control - NORM.
MODE 4 code control - A. Set a
code in the external computer.
MODE 4 AUDIO OUT switch -
OUT.
(3.) Modes 1, 2, 3/A, and/or 4 operating
procedure.
NOTE
If the external security computer is not
installed, a NO GO light will illuminate
any time the Mode 4 switch is moved out
of the OFF position.
1.
MASTER control - NORM.
2. M-1, M-2, M-3/A, and/or MODE
4 ON-OUT switches - ON. Actu-
ate only those switches corre-
sponding to the required codes.
The remaining switches should be
left in the OUT position.
3-81