TM 11-5840-281-35/1
(h) Vertical Presentation: CHANNEL A.
(16) Observe azimuth Antenna AS-1292/
(i) CHANNEL A AC-DC: AC.
TPN-8 scan. Azimuth Antenna AS-1292/TPN-8 should
(j) CHANNEL A SENSITIVITY: AS REQUIRED.
be scanning a sector of approximately 40 degrees,
(2) Position azimuth Antenna AS-1292/
centered around 0 degree on azimuth scan protractor.
TPN-8 by hand to scan angle of 15 degrees (15 degrees
(17) If azimuth Antenna AS-1292/TPN-8
ccw from 0-degree position of azimuth scan protractor),
scan sector is displaced 180 degrees, place SCAN
as indicated on azimuth scan protractor. Maintain this
switch on master Pulse Generator 0-1333/ TPN-18 to
scan angle while per- forming (3) and (4) below.
OFF. Loosen three screw clips holding azimuth synchro
(3) On azimuth Antenna Drive TG-113/
B1001, and rotate azimuth synchro B1001 180 degrees.
TPN-8, loosen three screw clips that hold azimuth
Tighten three screw clips on azimuth synchro B1001.
synchro B1001.
Repeat equipment conditions and connections detailed in
(4) Rotate azimuth synchro until null voltage
b and c(1) through (4) above.
(minimum vertical deflection of sweep trace) is indicated
(18) On master Pulse Generator 0-1333/
on oscilloscope and tighten screw clips on azimuth
TPN-18, insure that SCAN MODE switch is placed to
synchro.
350 EL, and SCAN switch is placed to ON.
(5) On electronic control preamplifier, re-
(19) Check antenna scan sequence on
move oscilloscope vertical input test prod from AZ POS
Control-Indicator C-6988/TPN-18. Sequence should be:
FB (feedback) testpoint TP7501 and reconnect to AZ
azimuth ccw, elevation up, azimuth cw, and elevation
DRIVE SIG testpoint TP7502.
down. If sequence is incorrect, 35-degree synchro B503
(6) Position elevation Antenna AS-1291/
is incorrectly nulled.
TPN-8 by hand to bottom dead center of its scan.
(20) If 35-degree synchro B503 is
Maintain this scan angle while performing (7) and (8)
incorrectly nulled, as indicated by performance of step
below.
(19) above, place SCAN switch on master Control-
(7) On elevation Antenna Drive TG-114/
Indicator C-6988/TPN-18 to OFF. Loosen three screw
TPN-8, loosen three screw clips holding 10-degree
clips holding 35-degree synchro B503, and rotate 35-
synchro B502.
degree synchro B503 180 degrees. Tighten three screw
(8) Rotate 10-degree synchro B502 to
clips on 35-degree synchro B503, then repeat steps (9)
obtain null indication on oscilloscope and tighten three
through (19) above.
screw clips on 10-degree synchro B502.
(21) On master Pulse Generator 0-1333/
(9) On master Control-Indicator C-6988/
TPN-18, place SCAN MODE switch to 600 AZ and
TPN-18, place SCAN MODE switch to 35 EL.
insure that SCAN switch is placed to ON.
(10) Position elevation Antenna AS-1291/
(22) Check antenna scan sequence on
TPN-8 by hand to bottom dead center of its scan.
Control-Indicators C-6988/TPN-18. Sequence should be
Maintain this scan angle while performing (11) and (12)
as described in (19) above. If sequence is incorrect, 10-
below.
degree synchro B502 is incorrectly nulled.
(11) Loosen three screw clips holding 3S-
(23) If 10-degree synchro B502 is
degree synchro B503.
incorrectly nulled as indicated by performance of (22)
(12) Rotate 35-degree synchro B503 to
above, place SCAN switch on master Pulse Generator 0-
obtain null voltage indication on oscilloscope and tighten
1333/TPN-18 to OFF. Loosen three screw clips holding
three screw clips on 35-degree synchro B503.
10-degree synchro B502, and rotate 10-degree synchro
(13) On drive motor amplifier, place AZ
B502 180 degrees. Tighten three screw clips on 10-
DRIVE POWER circuit breaker CB9001 to ON.
degree synchro B502, then repeat (5) through (8) above.
(14) On master Pulse Generator 0-1333/
(24) On master Pulse Generator 0-1833/
TPN-18, place SCAN switch to ON.
TPN-18, place SCAN switch to OFF.
(15) On control panel of Radar Receiver-
(25) Check azimuth Antenna AS-1292/
Transmitter RT-818/TPN-18, place SCAN switch to ON
TPN-8 over-scan by positioning azimuth Antenna AS-
position.
1292/TPN-8 by hand to extreme ccw and cw
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