User's Manual

044-05156 Rev C 22
Amplifier Module RF Control and Indicators Definition
Amplifier
Alarm
Latching
LED
MCPA
Module
System
Alarm
(From
Subrack)
MCPA
Disable signal
(pin 4)
Condition
Auto-
Recovery
Over PWR
Fault
Yes Red Disable Major High
MCPA Module P
out
> 52 dBm (Note 1)
None
Over PWR
Fault
No Red Disable Major High
P
in
> -6 dBm software; -
5 dBm hardware
<-12 dBm
Software
High
Temperature
No Red Enable None Low
Base plate
temperature >
80 C
<75°C
High
Temperature
No Red Disable Major High
Base plate temperature
>
85 C
<75°C
VSWR No Red Enable None Low
Reflected and Forward
Powers both exceed
40W. Condition exist for
less than 1 minute
Reflected or
Forward Power
< 38W
VSWR Yes Red Disable Major High
Alarm set after alarm
state on for more than 1
minute
None
DC Fail No Red Disable Major High
Average Internal
voltage out of range.
(Note 2)
DC Fail
(Over
Voltage)
No Red Disable Major High
+27V DC input
> 30.5 V
30.0V
DC Fail
(Under
Voltage)
No Red Disable Major High +27VCD input < 21 V 21.5V
Fan Fail No Red Enable Minor Low
Any fan fail (<70 Hz
Speed)
(>100 Hz
Speed)
Loop Fail Yes Red Disable Major High
Loop fail detected longer
than 2 min
None
Low PWR N/A Red Enable None Low
Indication shown base
on rack RS 485
command.
NA
MCPA Module Alarm Definition:
Note 1: When Over Power detected at the output:
a) MCPA Module will shut down (Disable).
b) Turn on red Over Power lamp.
c) Latch Over Power alarm
d) The MCPA Module will use a RMS detector to determine the over power fault.
Note 2: The Appropriate Status lamp will turn off, indicating which voltage is out of its range.
(10% range for +15V, +5V, and -5V).
The amplifier module has an average output of 125 watts power (1250 watts peak power) with intermodulation
products suppressed to better than -63 dBc below carrier levels. The amplifier provides an amplified output signal
with constant gain and phase by adding approximately 25 dB of distortion cancellation on the output signal.
Constant gain and phase is maintained by continuously comparing active paths with passive references, and
correcting for small variations through the RF feedback controls. All gain and phase variations, for example those
due to temperature, are reduced to the passive reference variations. The amplifier module is comprised of:
Preamplifiers Two feed-forward loops with phase-shift and gain controls
Main amplifier DC/DC power regulator
Error amplifier Alarm monitoring, control, and display panel