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Page Title:
Preliminary Subsystem Test-CONT. |
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 TM 11-5895-833-12/NAVELEX 0967-LP-550-1010/TO 31R5-2TSC54-91
h. Adjust RF POWER meter upper and lower limit
CAUTION
controls to set pointers at -2.5 and -0.5 dbm,
Make sure that the power input signal to the
respectively.
equipment power meters do not ex-ceed 0
i. Adjust the test translator LEVEL SET ATTEN-
dbm for the down-converter or -14 dbm
ATTEN 1 and -ATTEN 2 controls to obtain a reading of -
(equivalent to 0 dbm output) for the up-
10 dbm +3 db on the down-converter RF POWER meter.
converter; otherwise, damage will result.
Use suitable attenuation where necessary.
NOTE
c. Set test translator controls as follows:
Do not change the settings of the test
translator LEVEL SET ATTEN-ATTEN 1
Control
Position
and -ATTEN 2 controls throughout the
POWER ON-OFF switch
ON
remainder of the procedure.
LO SEL switch
725 MHz
LEVEL SET ATTEN-ATTEN 1
0 (fully cw)
j. Set up-converter STATUS SELECTOR switch to
control
each position in turn and observe the following
LEVEL SET ATTEN-ATTEN 2
0 (fully cw)
indications on the STATUS meter:
control
70 MHz ON switch
ON (up)
Position
Indication
5 MHz ON switch
ON (up)
70 MHz IF
Blue scale (readjust IF level
d. Set controls on all up-converters as follows:
attenuator, if necessar y)
700 MHz IF
Blue scale
Control
Position
+ 24V
Green scale
RF OUTPUT waveguide switch
OFF LINE
RF LO TUNE
Red scale
POWER ON-OFF circuit breaker
ON
STD LVL
Blue scale
TRANSMIT FREQUENCY
8250.00
RF LO
Blue scale
SELECTOR MHz thumbwheel
IF LO
Blue scale
switches
POWER METER RANGE switch
0 DBM
k. Set down-converter STATUS SELECTOR to each
RF OUTPUT LEVEL ADJ
30 (fully cw)
position in turn and observe the following indications on
control
the STATUS meter:
e. Set controls on all down converters as follows:
Position
Indication
Control
Position
+ 24V
Green scale
POWER ON-OFF circuit breaker
ON
STD LVL
Blue scale
RECEIVE FREQUENCY
7525.00
RF LO
Blue scale
SELECTOR MHz thumbwheel
IF LO
Blue scale
switches
700 MHz IF
Approximately 0 to 3
POWER METER RANGE switch
0 DBM
700 MHz IF
Blue scale (applies to
down-converter(wide-band
NOTES
if.) only)
The MODE SELECTOR SWITCHES for the
70 MHz IF
Blue scale
up- and down-converters should both be
RF LO TUNE
Red scale
set to same position (either FM or DGTL).
However, this does not affect the purpose
l. Momentarily disconnect the up-converter if. test
of this test.
cable from jack J6 on rear of the up-converter. Observe
that up-converter RF LEVEL indicator lamp illuminates
Changing MODE SELECTOR switch
and audible alarm activates.
setting from FM to DGTL or DGTL to FM
m. Reconnect test cable to same jack on the rear of
causes RF LO FAULT INDICATOR light to
up-converter. Observe that up-converter RF LEVEL
flash for a period not to exceed 180
indicator lamp extinguishes and audible alarm
seconds and then extinguishes. This
deactivates.
indicates noise burst detection is operating
n. Momentarily disconnect associated frequency
properly.
synthesizer (associated with up-converter under test)
f. Set up-converter STATUS SELECTOR switch to 70
cable from REFERENCE FREQUENCY SYNTH IN
MHz IF.
connector J2. Observe that up-converter RF LEVEL, RF
g. Adjust RF OUTPUT LEVEL ADJ control for -1.5
LO FAULT and IF LO FAULT INDICATOR lamps
dbm
indication
on
RF
POWER
meter.
illuminate and that audible alarm activates.
Change 1 3-16
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