User Manual

MCA9129-90-A Installation & Service Manual
Ó Copyright Powerwave Technologies, Inc., July 2001. All rights reserved
044-05060 Rev. C 4-2 July 2001November 2002
Amplifier Subrack Amplifier
Subrack
MCA9129-90-A
RS-485 Alarm
Interface
VVA
C
o
m
b
i
n
e
r
True
RMS
Gain Adjust
Splitter
Micro
Processor
(DC,
RF Relay,
Alarms)
ISO
ISO
ISO
ISO
ISO
Sample
Alarm
Alarm
Alarm
Alarm
Ctrl
4x +27VDC
4x Ground
RF Input
RF Output
Form-C Alarms
MCA9129-90-A
MCA9129-90-A
MCA9129-90-A
Amplifier Subrack Amplifier
Subrack
MCA9129-90
RS-485 Alarm
Interface
VVA
C
o
m
b
i
n
e
r
True
RMS
Gain Adjust
Splitter
Micro
Processor
(DC,
RF Relay,
Alarms)
ISO
ISO
ISO
ISO
ISO
Sample
Alarm
Alarm
Alarm
Alarm
Ctrl
4x +27VDC
4x Ground
RF Input
RF Output
Form-C Alarms
MCA9129-90
MCA9129-90
MCA9129-90
Figure 4-1 MCA9129-90MCA9129-90-A Four Module Amplifier System
4-5 MCA9129-90MCA9129-90-A Amplifier Module
The amplifier module, figure 4-2, has an average output of 120 watts power (1200 watts peak
power) with intermodulation products suppressed to better than -65 dBc below carrier levels at
100 watts output, -60 dBc at 120 watts output. The amplifier provides an amplified output signal
with constant gain and phase by adding approximately 30 dB of distortion cancellation on the out-
put 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