TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
c.
Rotate EL TARGET control
c.
Pulse and receiver noise
fully ccw.
amplitude on oscilloscope
increase (some di level
shift).
d.
Rotate IF GAIN--El control
d.
Pulse and receiver noise
fully ccw.
on oscilloscope disappear.
9
----------------------------------
------------------------------
Disconnect radar test set and
oscilloscope
NOTE. Do not replace covers
on Radar Receiver-Transmitter
RT-818/TPN-18 until tests are
completed.
4-12
Testing Radar Transmitter
NOTE
When magnetron has been replaced In
radar transmitter, or power has not been
applied for an extended period of time,
a
Test Equipment Required. Radar Test Set
or magnetron arcs when high voltage is
AN/UPM66 (radar test set)
applied, allow a 15-minute magnetron fil-
ament warmup period, place NORMAL
-12 POWER switch on radar transmit-
b.
Equipment Conditions.
TRANSMITTER switch on master Con-
trol-Indicator C-8988/TPN-18 through
(1) Radar Set AN/TPN-18 turned on,
WIDE to HV ON. Operate for a mini-
aligned, and tuned.
mum period of 2 hours in this mode (%
POWER mode) before returning to nor-
(2) Front and rear covers removed from
mal operation or performing this test.
Radar Receiver-Transmitter RT-818/TPN-18.
c.
Procedure.
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
Radar Receiver-
a.
a.
1
Radar test set
On radar transmitter, observe
4 ma min, 7 ma max.
Transmitter RT-818/
POWER: ON
narrow pulse magnetron cur-
Indication is stable.
TPN/18 control panel
rent indication on MAG CUR
SCAN:OFF
meter
b.
b.
MAIN POWER: ON
On master Control-Indicator
HV ON indicator lighted
HV: OPERATE
C-6988/TPN-18, observe HV
Radar transmitter
ON indicator.
c.
c.
NORMAL--1/2 POWER
Place TRANSMITTER
HV ON indicator lighted
NORMAL
switch through WIDE to HV
NORMAL--MTI:
ON.
d.
d.
NORMAL
On radar transmitter, observe
20 ma min, 26 ma max.
Master Control-Indicator
narrow pulse magnetron cur-
Indication stable.
C-6988/TPN-18 and
rent indication on MAG CUR
Pulse Generator
meter M201.
O-1333/TPN-18
SCAN:OFF
FOCUS: Fully ccw
INTENSITY: Fully ccw
POWER: ON
SCAN MODE:
SEARCH
TRANSMITTER: Thru
NARROW to HV on
4-25
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