Nautel FM10, Technical Instructions

Page: 58 / 200

10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 3-15
15 July 1997
Table 3-2 Control/Monitor Function Controls and Indicators (Continued)
PANEL MARKING/
REF FIG NOMENCLATURE FUNCTION
DES NO. USED IN TEXT
A14BT2 MD-2
♠
BATTERY Contributes 1.5 VDC towards a 4.5 VDC power
source that is utilized as an uninterruptible power
supply. Allows transmitter's operating power level,
RF on/off status and latched alarm conditions to be
retained when the AC power source is inadvertently
turned off or when a power failure occurs.
A14BT3 MD-2
♠
BATTERY Contributes 1.5 VDC towards a 4.5 VDC power
source that is utilized as an uninterruptible power
supply. Allows transmitter's operating power level,
RF on/off status and latched alarm conditions to be
retained when the AC power source is inadvertently
turned off or when a power failure occurs.
A14DS1 MD-2
♠
REPLACE BATTERY When turned on, indicates the backup battery voltage
is too low (less than 4.1VDC).
A14R20
MD-2
♠
REFLD PWR Adjusted to activate the reflected power monitoring
circuits when the reflected power exceeds 440 watts.
The RF output level will be reduced to a level that will
limit the reflected power to 440 watts by reducing the
output voltages of the switching power supplies being
applied to the RF power amplifier modules.
A14R11
MD-2
♠
PA VOLTS Adjusted to provide a maximum output power
reference voltage for the output power raise/lower
circuitry.
A14R116 MD-2
♠
IPA VOLTS Adjusted to set intermediate RF level by controlling
the output voltage of the IPA switching power supply.
A14R129
MD-2
♠
FWD PWR Adjusted to calibrate the forward power sample signal
from the forward/reflected power probe for use by the
control/monitoring circuitry.
A14R130
MD-2
♠
IPA REFLD Adjusted to set the IPA reflected power monitor
threshold to 160 watts. Causes RF output to be
shutback when IPA reflected power exceeds this
threshold.