Nautel FM10, Технические инструкции, Страница: 66 / 200

10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 4-3
01 October 2002
COMMISSIONING PROCEDURES
4.10
The commissioning procedures are
presented in a step-by-step format to permit a person
who is unfamiliar with the transmitter to perform a
commissioning check. Procedures should be
completed in sequence, as each establishes switch
settings and contains prerequisites for subsequent
procedures.
NOTE
The transmitter was calibrated and subjected to an
extensive burn-in. It should not be necessary to
change the setting of any adjustment, other than
those specified in the following procedures.
Unless otherwise stated, all referenced controls and
indicators are located on, or are accessible from,
the front of the control/monitor panel.
4.10.1 CONTROL/MONITOR BACKUP
BATTERY INSTALLATION: Install the control/
monitor PWB's backup batteries as follows:
(a) Locate three 1.5 volt batteries provided with the
ancillary parts kit.
(b) Set all of the circuit breaker panel's
POWER
SUPPLY CONTROL
(
PWR MDL A
thru
F
and
IPA
) circuit breakers to their OFF positions.
(c) While pressing the control/monitor panel's
RF
OFF
switch, set the circuit breaker panel's
MAIN
POWER
circuit breaker to its ON position.
NOTE
When the control/monitor PWB's batteries are not
installed, the latched state of critical RF control
signals is not necessarily maintained when AC
power is removed from the transmitter. Pressing the
RF OFF switch while applying AC power ensures
that the transmitter will turn on in an RF off' state.
(d) Install the three batteries in the control/ monitor
PWB's battery holder, ensuring they are
properly oriented and fully engaged.
NOTE
The control/monitor PWB (A14) is located at the
inside, top, left of the cabinet. Refer to figure MD-2
as an aid in locating the control/monitor PWB and
then, if additional information is necessary, to its
service instruction manual.
(e) Press
ALARM RESET
to clear any transient
alarms that may have occurred when ac power
was applied.
(f) Press the
PROTECT RESET
and
MODULE
RESET
switches.
4.10.2 EXCITER SETUP: Before proceeding
with the transmitter commissioning, the exciter must
be properly set.
(a) Set all of the circuit breaker panel's
POWER
SUPPLY CONTROL
(
PWR MDL A
thru
F
and
IPA
) circuit breakers to their OFF positions.
(b) Set the circuit breaker panel's
MAIN POWER
circuit breaker to its ON position.
(c) Complete the exciter's interlock circuit by
activating the RF power stage's on/off control
circuitry (press/release the control/monitor
panel's
RF ON
switch).
NOTE
A relay on the control/monitor PWB, which provides
a contact closure or opening (as required) as the
exciter interlock, is energized when the RF power
stage's on/off control circuitry is activated.
(d) Using the IPA input power probe's output
coaxial cable (W40), connect the exciter's RF
output, through a Bird power meter, to a
precision 50-ohm load that has a minimum
rating of the exciter's maximum output.
(e) Turn on the exciter and adjust it's RF output for
20 watts on the Bird power meter.
(f) Verify the frequency of the exciter's RF drive
output is the assigned carrier frequency.
(g) Turn the exciter off.