10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 4-4
01 October 2002
WARNING
(h)
Using IPA input power probe's output cable
(W40), connect the exciter's RF output to the
IPA module's RF input connector (A17J5).
NOTE
Do not turn on the exciter until specifically
requested in the following procedures.
4.10.3
PRELIMINARY SETTINGS:
Verify the
transmitter is ready to turn on as follows:
(a)
Verify pre-commissioning requirements of
paragraph 2.2 and 2.3 have been completed.
(b)
Set the circuit breaker panel's
MAIN POWER
circuit breaker to
OFF
.
(c)
Set
IPA VOLTS
potentiometer A14R116 fully
counter clockwise (minimum of twenty-four
turns), noting it is located on control/monitor
PWB A14. Refer to figure MD-2 as an aid in
locating this adjustment.
(d)
Terminate the transmitter's RF output into a
precision 50-ohm dummy load, rated at a
minimum of 15 000 watts. If a dummy load is
not available, the system antenna may be used
as the load.
If a jumper is placed between the interlock inputs
(TB1-11 and TB1-12) on control/monitor PWB
A14, safety features provided by the external
interlocks will be disabled. It is recommended that
a fail-safe method of alerting personnel to this fact
be implemented. Voltages that are dangerous to
life will be present on RF output stages and the
antenna system if the transmitter is turned on.
(e)
Close all external interlocks or temporarily
connect a jumper wire between TB1-11 and
TB1-12 of the control/monitor PWB.
(f)
Obtain the
Proof of Performance Test
results
and the completed copy of table 5-6
Factory
Determined Measurements for Critical
Parameters
that were taped to the front of the
transmitter during packing for shipment. It is
recommended they be inserted into section 5 of
this manual along with the blank table 5-6 that
is provided. The blank table 5-6 is provided for
future transmitter testing/verification.
NOTE
The data in table 5-6 was compiled at the factory
with the transmitter terminated in a precision 50-
ohm dummy load. Measurements made on site into
a dummy load or the station antenna may not yield
the same readings. Slight variances are acceptable.
The data is provided as a routine maintenance and
trouble shooting aid.
4.10.4
INITIAL TURN-ON:
Turn on the
transmitter and observe its alarm and status
indications as follows:
(a)
Verify the requirements of paragraph 4.10.3
have been completed and are being met.
(b)
Switch on AC power at the service entrance.
(c)
Set all of the circuit breaker panel's
POWER
SUPPLY CONTROL
(
PWR MDL A
thru
F
and
IPA
) circuit breakers to their
ON
positions.
(d)
Set the circuit breaker panel's
MAIN POWER
circuit breaker to its
ON
position.
(e)
The circuit breaker panel's
AC ON
lamp shall
turn on.
(f)
Reset any inadvertent alarm indications (press/
release the control/monitor panel's
ALARM
RESET
switch). All alarm indications, except
the power supply control panel's
FAN FAIL
alarm lamp, shall turn off. The
FAN FAIL
alarm lamp shall be on.
(g)
Pre-set the output voltage of all PA switching
power supplies to their minimum level
(simultaneously press/release the control/
monitor panel's
TRANSMITTER OUTPUT
POWER - RAISE
and
LOWER
switches).
4.10.4.1 Low Voltage DC Power Supplies:
Check
the +24, +15, -15, +5 and B+ Volts power supplies
as follows:
(a)
Set the
DC SUPPLY VOLTAGE
switch to
+24V
.
(b)
The
DC SUPPLY VOLTAGE
meter's indication
should be a nominal 24 volts DC.
(c)
Set the
DC SUPPLY VOLTAGE
switch to
+15V
.
Summary of Contents for FM10
Page 173: ...Figure SD 1 Electrical Schematic FM10 FM Broadcast Transmitter Overview Page SD 1 15 July 1997...
Page 174: ...Figure SD 2 Electrical Schematic AC DC Power Supply Sheet 1 of 2 Page SD 2 15 July 1997...
Page 175: ...Figure SD 3 Electrical Schematic AC DC Power Supply Sheet 2 of 2 Page SD 3 15 July 1997...
Page 177: ...Figure SD 5 Electrical Schematic 3 Phase Monitor PWB NAPC60 03 Page SD 5 15 July 1997...
Page 178: ...Figure SD 6 Electrical Schematic RF Power Stage Sheet 1 of 2 Page SD 6 15 July 1997...
Page 179: ...Figure SD 7 Electrical Schematic RF Power Stage Sheet 2 of 2 Page SD 7 15 July 1997...
Page 180: ...Figure SD 8 Electrical Schematic RF Combiner Final Filter NAF79 Page SD 8 15 July 1997...
Page 181: ...Figure SD 9 Electrical Schematic Control Monitor Function Page SD 9 15 July 1997...
Page 182: ...Figure SD 10 Electrical Schematic Control Display PWB NAPD05 01A Page SD 10 15 July 1997...
Page 185: ...Figure MD 1 Assembly Detail FM10 FM Broadcast Transmitter Front View Page MD 1 15 July 1997...
Page 186: ...Figure MD 2 Assembly Detail FM10 FM Broadcast Transmitter Rear View Page MD 2 15 July 1997...
Page 189: ...Figure MD 5 Assembly Detail NAG02 01 NAG02 02 Circuit Breaker Panel Page MD 5 15 July 1997...
Page 190: ...Figure MD 6 Assembly Detail NAC76 Power Supply Control Panel Page MD 6 15 July 1997...
Page 192: ...Figure MD 8 Assembly Detail NAPD05 01A Control Display PWB Page MD 8 15 July 1997...
Page 193: ...Figure MD 9 Assembly Detail NAI07 Intermediate RF Drive Splitter Page MD 9 15 July 1997...
Page 194: ...Figure MD 10 Assembly Detail NAFP68 IPA Input Power Probe Page MD 10 15 July 1997...
Page 196: ...Figure MD 12A Assembly Detail NAS43 02 Low Voltage Power Supply Page MD 12A 15 July 1997...
Page 197: ...Figure MD 12B Assembly Detail NAS43 02A Low Voltage Power Supply Page MD 12B 15 July 1997...
Page 199: ...Figure MD 14 Assembly Detail NAPC60 03 3 Phase Monitor PWB age MD 14 15 July 1997...
