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 TM 11-5895-833-12/NAVELEX 0967-LP-550-1010/TO 31R5-2TSC54-91
e. Set distribution amplifier POWER ON-OFF circuit
NOTE
breaker to OFF.
Changing MODE SELECTOR switch
f. Set up-converter POWER ON-OFF circuit breakers
setting from FM to DGTL or DGTL to FM
to OFF.
causes RF LO FAULT INDICATOR lamp to
g. Set frequency synthesizer unit POWER ON-OFF
flash for a period not to exceed 180
toggle switch to OFF.
seconds and then extinguish. This indicates
h. Insure that the looping plugs are connected
noise burst detection is operating properly.
between jacks of the time base patch panel (fig. 3-8).
i. Set distribution amplifier POWER ON-OFF circuit
o. Set RF OUTPUT switch to ON LINE.
breaker to ON. The POWER ON indicator lamp should
illuminate.
NOTE
j. Set STATUS SELECT switch to each position in
An up-converter is operational as soon as it
turn, and observe that the STATUS indicator meter reads
is turned on; however, a 1-hour warm-up
in the blue scale.
period should be allowed to achieve
k. Set each frequency synthesizer POWER ON-OFF
maximum stability.
toggle switch to ON. The POWER ON indicator lamps
should illuminate.
p. Repeat the procedures outlined in m, n, and o
l. Set METER FUNCTION switch to each position in
above for all remaining up-converters.
turn and observe that the meter reads in the green scale.
q. Set down-converter POWER ON-OFF circuit
m. Set up-converter POWER ON-OFF circuit breaker
breaker to ON; the POWER on indicator lamp should
to ON, the POWER ON indicator lamp should illuminate,
illuminate, the RF LO FAULT and IF LO FAULT
the RF LEVEL, RF LO FAULT INDICATOR lamps
INDICATOR lamps should b extinguished and the
should be extinguished and the audible alarm should be
audible alarm should b silent.
silent.
NOTE
NOTES
The RF LO FAULT and IF LO FAULT
The RF LO FAULT and IF LO FAULT
INDICATOR lamps may be momentarily
INDICATOR lamps may be momentarily
illuminated and the audible alarm may
illuminated and the audible alarm may
sound for a short period of time.
sound for a short period of time.
r. Set STATUS SELECTOR switch to each position in
Should RF LO FAULT INDICATOR lamp go
turn and observe the following indications on STATUS
on at loss of rf oscillator phase lock, when
meter:
phase lock is reestablished light may flash
Position
Indication
for a period not to exceed 180 seconds
+ 24V
Green scale
before extinguishing.
STD LVL
Blue scale
RF LO
Blue scale
n. Set STATUS SELECTOR switch to each position in
IF LO
Blue scale
turn and observe the following indications on STATUS
700 MHz IF
Approximately 0 to 3
meter.
700 MHz IF
Varies with input signal
(low scale) level (applies to
Position
Indication
down-converter (wide-band
70 MHz IF
Blue scale
if.) only)
700 MHz IF
Blue scale
70 MHz IF
Varies with input signal
+ 24V
Green scale
(low scale) level
RF LO TUNE
Red scale
RF LO TUNE
Red scale
STD LVL
Blue scale
RF LO
Blue scale
NOTES
IF LO
Blue scale
Set the MODE SELECTOR switch to FM
or DGTL, depending upon the required
NOTE
carrier operation.
Set the MODE SELECTOR switch to FM or DGTL,
The 700 MHz IF and 70 MHz IF positions of
depending upon the required carrier operation.
the STATUS SELECTOR switch are used
primarily for maintenance due to the signal
Ievels required to scale the STATUS meter
in these positions.
Change 1 3-19
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