TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
equipment, ppi scan on
slave Control-Indicator
C-6988/TPN-18 will be
rotating if associated iff
antenna is rotating.
d.
d.
On associated iff equipment,
Ppi scan on slave Con-
place IFF ANTENNA switch
trol-Indicator C-6988/
on Electrical Equipment Cabi-
TPN-18 stops. Beta scan
net CY-4922/TPX to OFF and
on master Control-Indi-
observe presentation on both
cator C-6988/TPN-18
Control-Indicators C-6988/
continues to scan.
TPN-18.
17 ------------------------------------- As last indicated, except:
a.
a.
Observe presentation on both
Ppi scan on both Control-
Master Pulse Generator
Control-Indicators C-6988/
Indicators C-6988/
0-1333/TPN-18
TPN-18.
TPN-18.
b.
b.
SCAN MODE:
On master Pulse Generator 0-
Both ppi scans are
SEARCH
1333/TPN-18 place SCAN
stopped.
switch to OFF position.
c.
c.
Manually position associated iff
Iff antenna positioned to
antenna to North or some
North or some known
known azimuth bearing.
azimuth bearing.
d.
d.
Observe azimuth bearing on
Both ppi sweeps intercept
compass rose ring at which ppi
respective compass rose
sweeps intercept on both Con-
ring at same azimuth
trol-Indicators C-6988/TPN-18.
bearing at which associ-
ated iff antenna is posi-
tioned in c above.
e.
e.
On associated iff equipment,
Ppi scan on both Control-
place IFF ANTENNA switch
Indicators C-6988/
on Electrical Equipment Cabi-
TPN-18 rotate.
net CY-4922/TPX to ON and
observe presentation on both
Control-Indicators C-6988/
TPN-18.
f.
f.
Observe video on both Control-
Radar video and iff video
Indicators C-6988/TPN-18.
on master Control-Indi-
cator C-6988/TPN-18. Iff
NOTE. Do not replace rear
video only on slave Con-
cover on Control-Indicators C-6988/
trol-Indicator C-6988/
TPN-18 until tests are completed.
TPN-18
4-18.
Testing Precision Scan Displays
b.
Equipment Conditions.
(1) Radar Set AN/TPN-18 turned on and
aligned.
a. Test Equipment and Materials Required.
(2) Rear cover removed from Control-Indica
Electronic Voltmeter ME-202A/U (differential
tors C-4988/TPN.
voltmeter).
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
a. None.
Differential
Radar Receiver-
a.
Connect test lead between
1
Pulse Generator 0-1333/
voltmeter
Transmitter RT-818
TPN-18 chassis ground in Con-
control panel
POWER: ON
trol-Indicator C-6988/TPN-
MAIN POWER: ON
NOTE: Place OPERATE.
18 under test and negative
SCAN: ON
CALIBRATE switch to
(-) terminal on differential
HV: OPERATE
CALIBRATE and adjust
Both Control-Indicators
CALIBRATE contml to
zero meter then return
4-40
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