TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
d.
d.
IF GAIN-AZ: Fully
On master Control-Indicator
None.
ccw
C--6988/TPN-18, rotate IF
IF GAIN-EL: Fully
GAIN-AZ fully cw.
ccw
e.
e.
On Control-Indicator C-6988/
Video and noise on eleva-
SCAN MODE: NORM
TPN-18 under test, observe
tion and azimuth scan.
SCAN: ON
azimuth and elevation displays.
VIDEO GAIN: Normal
f.
f.
On master Control-Indicator
Elevation video de-
EL TARGET: Fully ccw
C-6988/TPN-18 rotate EL
creases as EL TARGET
TARGET control fully cw,
control is rotated cw,
while observing azimuth and
while azimuth video
elevation scans on Control-
remains unchanged.
Indicator C-988/TPN-18.
g.
g.
Rotate EL TARGET fully
Elevation video increases.
ccw. Push in Pulse Generator
O-1333/TPN-18 and secure
with two thumbscrews.
h.
h.
Replace rear cover on Control-
None.
Indicator C-6988/TPN-18.
NOTE: Leave PREC DELAY 1
control R1120 or PREC DELAY 2
control R1119 (as selected by
CURSOR SELECT switch S1104)
adjusted .to position touchdown
range mark at start of sweep.
radar site elevation when the ALTITUDE control
4-19.
Testing Height Finder Cursors
is at maximum counterclockwise position. To fa-
cilitate this test, the ALTITUDE indicator is
a. Test Equipment and Materials Required. Cli-
reset at the beginning of the test to indicate zero-
nometer MP3502.
feet elevation (thereby avoiding the calculation of
the indicated altitude for each checkpoint), and
b.
Equipment Conditions.
reset at the conclusion of the test to the radar site
elevation.
(1) Radar Set AN/TPN-18 turned on and
aligned.
(4) Pulse Generator 0-1333/TPN-18 in Con-
(2) Clinometer MP3502 installed on elevation
trol-Indicator C-6988/TPN-18 under test, pull
Antenna AS-1291/TPN-8.
out for access to top deck controls and adjust-
(3) The ALTITUDE indicators on Pulse
ments.
Generators 0-1333/TPN-18 in Control-Indicators
(5) PREC DELAY 1 control R1120 or PREC
C-6988/TPN-18 are normally set to indicate the
DELAY 2 control R1119 (as selected by CURSOR
altitude of the aircraft above sea level. The ALTI-
SELECT switch S1104) adjusted to position
TUDE indicators are therefore normally refer-
touchdown range mark at start of sweep.
enced to the radar site elevation and indicate the
c.
Procedure.
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
Radar Receiver-
a.
a.
1------------------------------------------
On Control-Indicator C-6988/
None
Transmitter RT-818/
TPN-18 undertest, adjust
INTENSITY and FOCUS
TPN-18
controls for normal operating
control panel
level and definition.
MAIN POWER:ON
SCAN:ON
4-45
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