with the operating control positions of the RT-
3-11. Starting Procedure
859/APX-72 and the C-6280(P) /APX. Per-
Set up the equipment for one of the appli-
form the preliminary test setup previously de-
cable operations as instructed in paragraph
scribed in paragraph 310 and proceed as fol-
3-10 and proceed as follows to start the equip-
a. Prelimincny Panel Control Settings. Set
a. Set the AN/APM-123A (V) controls as
the RT859,/APX-72 MODE 2 code selector
follows: (fig. 3-3)
switches to a four-digit code. Set the
C6280 (P) /APX controls as outlined in the
28 VDC-115 VAC-OFF power switch
except mode 4.
SIDELOBE SUPPRESSION ON-
STBY for one minute,
then set to NORM.
AB-CD CODE controls
b. Remove the power cable from the cover
of the AN/APM-123A ( V).
c. Connect the power cable between the
MODE 4 switch
MODE 1 code selector
power source and AN/APM123A (V) POWER
MODE 3/A code selector
Caution: When connecting dc power cables
b. Systems Test. Set the AN/APM-123A (V)
supplied with battery clips to a dc power source,
FUNCTION switch to SYSTEM and proceed
be sure the battery clip with a red insulator is
connected to the positive ( + ) side of the bat-
(1) Use the chart below to set the mode
tery terminal. Improper connection will damage
switches of the AN/APM123A (V)
and the C6280 (P) /APX for the de-
d. Set the 28 VDC-115 VACOFF power
switch to 115 VAC if an ac power source is
used or to 28 VDC if a dc power source is used.
C-62S0 (P) /APX
The POWER indicator should light. Allow the
AN/APM123A ( V) to warm up for approxi-
mately two minutes.
M-2, M-3/A, M-C
e. Press the PRESS TO TEST switch. The
ACCEPT indicator should light. If the RE-
JECT indicator lights, the AN/APM-123.4 (V)
M-1, M-3/A, M-C
requires higher level maintenance.
f. Set the SIDELOBE SUPPRESSION
ON-OFF switch to ON. The ACCEPT indicator
M1, M-2, M-C
should remain lighted.
g. Release the PRESS TO TEST switch.
(2) Use the chart below to set the code
3-12. Receiver-Transmitter, Radio
selector switches of the AN/APM
123A(V), C - 6280(P)/APX, and
The operating control positions (code, mode,
RT-859/APX-72 for the desired
etc.) of the AN/APM123..4 (V) must agree