10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 2-4
01 October 2002
2.1.7.3
Protection Reset:
This remote control
circuit must be the equivalent of a single pole,
momentary contact switch. The switch must be in
the 'closed' position when pressed and return to the
'open' position when released. The switch must be
connected such that, when activated, +24V is
connected between the
PROTECTION RESET
(+)
(TB1-5) and
PROTECTION RESET
(-)
(TB1-6)
inputs. The operation of this remote control will
cause the RF power protection circuits to be reset,
allowing the RF output to be restored (if possible),
after a fault has caused the transmitter to be inhibited
indefinitely.
2.1.7.4
Power Increase:
This remote circuit must
be the equivalent of a single pole, momentary contact
switch. The switch must be in the 'closed' position
when pressed and return to the 'open' position when
released. The switch must be connected such that,
when activated, +24V is connected between the
POWER INCREASE
(+)
(TB1-7) and
POWER
INCREASE
(-)
(TB1-8) inputs. The operation of this
remote control will cause the RF output power to be
increased.
2.1.7.5 Power Decrease:
This remote circuit must
be the equivalent of a single pole, momentary contact
switch. The switch must be in the 'closed' position
when pressed and return to the 'open' position when
released. The switch must be connected such that,
when activated, +24V is connected across the
POWER DECREASE
(+)
(TB1-9) and
POWER
DECREASE
(-)
(TB1-10) inputs. The operation of
this remote control will cause the RF output power to
be decreased.
2.1.7.6 Low Power Select:
This remote circuit
must be the equivalent of a single pole single throw
switch. The switch must be connected such that,
when activated, ground potential is applied to
LOW
PWR SELECT
(TB1-18) input. The operation of the
remote control will cause the RF output to be set to
the level adjusted for
low power
operation.
NOTE
A 24V supply is available at TB2-15 of the
control/monitor PWB (A14). The (+) terminal of
each control input may be connected to TB2-15,
which will allow activation of the input by
momentarily connecting the appropriate (-) terminal
to ground.
2.1.8
EXCITER INTERLOCK:
Protection
circuitry within the transmitter will operate the
exciter interlock relay in an attempt to mute the
exciter's RF output when the exciter forward power is
excessive or when the transmitter is turned off. Refer
to exciter service manual and determine the required
contact arrangement, noting that:
-
If a closed contact (normally open) is required
to mute the exciter's RF output, connect the
exciter interlock wires between TB1-13 (
N/O
)
and TB1-15 (
COM
) of the control/monitor
PWB (A14).
-
If an open contact (normally closed) is required
to mute the exciter's RF output, connect the
exciter interlock wires between TB1-14 (
N/C
)
and TB1-15 (
COM
) of the control/monitor
PWB (A14).
2.1.9
RF PERFORMANCE MONITORING:
Forward power, reflected power and a sample of the
RF output are available for external monitoring.
2.1.9.1
Forward Power Level:
A buffered DC
voltage that is representative of the forward power
level is available at the
FWD PWR SAMPLE
terminal (TB2-12) of the control/monitor PWB (14).
This voltage varies according to the square root of
the forward power level and will be 12.6 ± 0.6 volts
DC at 11 000 watts. A ground terminal is provided
at TB2-13 as a sample reference.
2.1.9.2
Reflected Power Level:
A buffered DC
voltage that is representative of the reflected power
level is available at the
REFLD PWR SAMPLE
terminal (TB2-14) of the control/monitor PWB
(A14). This voltage varies according to the square
root of the reflected power level and will be 7.1 ± 0.4
volts DC at 440 watts. A ground terminal is
provided at TB2-13 as a sample reference.
2.1.9.3
RF Output Sample:
A -44 ± 2 dB sample
of the RF output (
RF Monitor
) is available at
RF
MONITOR
BNC coaxial connector J2. This output is
normally applied to a station modulation monitor, but
may be connected to an oscilloscope during
maintenance. The
RF Monitor
output will be a
nominal 4.7 volts RMS, into a 50 ohm load, when the
RF output power level is 11 000 watts.
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...