UHF Analog Driver/Transmitter/
Chapter 2, System Description,
Translator
Maintenance & Remote Control Connections
LX Series, Rev. 3
2-13
power greater than 100 Watts, system
power is monitored by an external
module that is connected to TB31. In
this configuration switches SW1 on the
control board must be set off.
The Forward Power of the Exciter Driver
Power Amplifier module is routed to the
Upconverter mo dule as AGC #1. A
system over-drive condition is detected
when this value rises above 0.9 VDC.
When an over-drive condition is
detected, the Upconverter module
reduces its RF output level.
For values less than 0.9 VDC, the
Upconverter uses this voltage for
automatic gain.
Table 2-24. Driver Amplifier Status Indicator
LED
FUNCTION
ENABLED
(Green)
When lit Green, it indicates that the PA is in the Operate Mode. If a
Mute occurs, the PA will remain Enabled, until the input signal is
returned.
DC OK
(Green)
When lit Green, it indicates that the fuse protected DC inputs to the
PA module are OK.
TEMP
(Green)
When lit Green, it indicates that the temperature of the heatsink
assembly in the module is below 78°C.
MOD OK
(Green)
When lit Green, it indicates that the PA Module is operating and has
no faults.
MOD OK
(Red)
If the Module OK LED is Red and blinking a fault is present.
1 Blink indicates Amplifier Current Fault.
2 Blinks indicate Temperature Fault.
3 Blinks in32V Power Supply Over Voltage Fault.
4 Blinks in32V Power Supply Under Voltage Fault.
5 Blinks indicate Reflected Power Fault.
6 Blinks in12V or –12V Power Supply Fault.
Table 2-25. Driver Amplifier Control Adjustments
POTENTIOMETERS
DESCRIPTION
RFL CAL
Adjusts the gain of the Reflected Power monitoring circuit
VISUAL CAL
Adjusts the gain of the Visual / Forward Power monitoring circuit
AURAL CAL
Adjusts the gain of the Aural Power monitoring circuit
VISUAL ZERO
Adjusts the offset of the Forward Power monitoring circuit
AURAL NULL
Adjusts the offset of the Forward Power monitoring circuit based on
the Aural signal level.
Table 2-26. Driver Amplifier Sample
DISPLAY
FUNCTION
FWD SAMPLE
RF sample of the amplified signal being sent out the module on J25.
