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 NAVSHIPS 0967-217-4010
TM 11-5895-490-20
Section Il. OPERATION
position, emergency, and X pulse. Mode C can
be modified for special pulse indications.
Receiver-Transmitter, Radio RT-859/APX-
b. To operate the RT859/APX72 in any of
72 operates as an active receiver-transmitter
the modes described above, perform the follow-.
unit which will respond only to an interrogat-
ing procedures:
ing signal from an external source correspond-
ing to the modes and codes preset in the
(1) Starting procedure (para 2-4).
C-6280(P)/APX and the RT-859/APX-72.
(2) Operating procedure (para 2-5).
a. The RT-859/APX-72 is capable of re-
(3) Stopping procedure (para 2-6).
sponding in nine coded modes of operation to
six coded modes of interrogation. The coded
interrogation inputs are classified as modes 1,
Perform the preliminary and starting pro-
2, 3/A, C, 4, and test. The normal coded output
cedures (a and b, below) before performing the
responses are classified as modes 1, 2, 3/A, C,
operating procedures (para 25).
and 4. Modes 1, 2, 3/A can be modified for
special responses, designated identification of
a. Preliminary.
Master power
(See note)
OFF
MASTER control
C-6280(P)/APX (fig. 2-1)
OFF
C-6280(P)/APX (fig. 2-1)
OUT
IDENT-MIC switch
C-6280(P)/APX (fig. 2-1)
M-1, M-2, M-3/A, M-C and
OUT
MODE 4 switches
C-6280(P)/APX (fig. 2-1)
OUT
AUDIO-LIGHT switch
C-6280(P)/APX (fig. 2-1)
OUT
RAD TEST-MON switch
C-6280(P)/APX (fig. 2-1)
Set to operational code required.
MODE 1, 3/A, and 4 code
select switches
RT-859/APX-72 (fig. 2-2)
Set to operational code required.
MODE 2 code select switch
Check preliminary control set-
b. Starting.
Note: The master power control is part of the air-
craft equipment and will vary in position between types
tings (a, above) for proper position, then per-
of aircraft. Refer to applicable aircraft technical
form the following starting procedures:
manual for location details.
ON
Master power
(See note in a, above)
STBY--one minute for standard
C-6280(P)/APX (fig. 2-1)
MASTER control
temperature conditions and
two minutes under extreme
ranges of operating tempera-
ture.
LOW--low receiver sensitivity
for receiving high energy
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