TM 11-5840-28135/1
Section IV. GENERAL SUPPORT TESTING PROCEDURES
spectrum should be checked each time the magnetron is
5-30. General
replaced.
a. Test Equipment Required. Test Set AN/ UPM33
General support testing procedures include the testing
(spectrum analyzer).
procedures provided for direct support maintenance in
b. Equipment Conditions.
Chapter 4 in addition to the test of the magnetron
(1) Radar Set AN/TPN-18 turned on, aligned,
spectrum provided in paragraph 531 below.
and tuned.
(2) Rear cover removed from Radar Receiver-
5-31. Testing the Magnetron Spectrum
Transmitter RT-818/TPN-18.
(3) Test Equipment connected as shown in
The spectrum of magnetron V201 in the radar transmitter
is checked to examine the operational parameters of the
NOTE
radar transmitter which cannot be accurately observed
If magnetron has been replaced in radar
by the use of general purpose test equipment. Normally,
transmitter, power has not been applied
the radar transmitter rf power output and frequency are
for an extended period of time, or
tested on a more frequent basis. If the rf power output
magnetron arcs when high voltage is
and frequency checks are normal, and the system
applied, allow a 15-minute magnetron
performance is good, the radar transmitter normally can
filament warmup period.
Place
be assumed to be functioning properly.
The
NORMAL4-2 POWER switch on radar
performance of the radar transmitter may be evaluated
transmitter to 1/2 POWER, and then
by checking the radar transmitter frequency, rf power
place TRANS MITTER switch on master
output, and magnetron spectrum. When the overall
Control-Indicator
C-6988/TPN-18
system performance is below normal and the radar
through WIDE to HV ON. Operate for a
transmitter is suspected, these checks are useful in
minimum period of 2 hours in this mode
determining the status of the radar transmitter. The
(1/2 POWER mode) before returning to
magnetron
normal operation of performing this test.
c. Procedure.
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
1
Spectrum analyzer
Radar Receiver
Rotate azimuth Antenna AS
None.
POWER: ON
Transmitter RT-818/
1292/TPN-18 by hand to an
MIXER AMPLIFIER:
TPN-18 control panel
area clear of any
Fully ccw
MAIN POWER: ON
nearby objects.
SPECTRUM WIDTH:
HV: OPERATE
Fully cw
SCAN: ON
INTENSITY: As required
Master Control-indicator
FOCUS: As required
C-6988/TPN-18 and
SELECTOR: MIXER
Pulse Generator
SYNC: ON
0-1S83/TPN-18
SCAN: OFF
SCAN MODE:
SEARCH
TRANSMITTER: Thru
WIDE to HV ON
HV ON indicator:
Lighted
ANT POL: LIN
2
As last indicated ....................... As last indicated .................
Check indication on MAG CUR
20 ma min, 26 ma max.
meter M201.
Indication is stable.
3
As last indicated ....................... As last indicated .................
a. On spectrum analyzer, adjust
a. None.
INTENSITY and FOCUS
controls for desired brilliancy and
sharpness of horizontal trace.
5-70
Previous Page
