Andrew Base Station Subsystems Group 100270MCPA Multiple Carrier Power Amplifier ( MCPA ) User Manual MCPA Users Manual 1 1

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RF Power Amplifiers
Multiple Carrier Power Amplifiers
Model: MCPA1900 & MCPA850
Operation Instruction
Date: July 25, 2005
Version. 1.0
Ref# RE: FCC ID S8L-100254MCPA &
RE: FCC ID S8L-100270MCPA
Andrew Corporation – Power Amplifier Group
Propriety – Use pursuant to Company Instruction
1 of 8
RF Power Amplifiers
Introduction
This document presents description of the Andrew Corporation 850/1900 Band MCPA
(Multi-Carrier Power Amplifier) amplifiers. The MCPA amplifier is a high power,
mixed-mode RF amplifier intended to provide signal amplification. The MCPA amplifier
is compatible with GSM/EDGE and WCDMA air interfaces operating in U.S. domestic
cell sites where FCC compliance is mandatory.
The Cell band (869 MHz to 894 MHz) MCPA and PCS band (1.93 GHz to 1.99 GHz) RF
power amplifier capable of amplifying multiple signals of different modulation types to a
composite power level of 135 Watts.
MCPA Specifications
The MCPA1900-135 and MCPA850-135 provide linear amplification of multi-carrier,
mixed-mode signals in the cellular and PCS frequency bands, respectively. The 850
Band and 1900 Band MCPA, have the following specifications:
Parameter
Specification
Operating RF Band
Instantaneous BW
Input DC Power
DC voltage input range
Rated Output Power
@ ≥ +26 to 30 VDC input
Rated Output Power
@ ≥ +24.0 to < +26.0 VDC
@ ≥ +21.0 to < +24.0 VDC
DC-RF Efficiency
Input signal types
Physical dimensions
Weight
Cooling technique
Temperature Range
869-894MHz for MSA850-135
1930-1990MHz for MSA1900-135
25MHz for MSA850-135
> 45MHz for MSA1900-135
+27 VDC, nominal
+21VDC to +30VDC
135W average
120W average
105W average
14%, rated output power, nominal input voltage
GSM/EDGE, WCDMA, TDMA
15” x 17.25” x 3.8”
< 35lbs
Integral Fan Tray, removable while unit is
operational
-40°C to +50°C operational, -20°C to +50°C
meeting specifications.
Table 1 MCPA Specifications
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RF Power Amplifiers
The cell amplifier has been designed to support an instantaneous bandwidth of 25 MHz.
Multiple carriers may be placed within a continuous 25 MHz span and the product shall
meet specified performance marks. The PCS amplifier has been designed to support an
instantaneous bandwidth of 45 MHz. Multiple carriers may be placed within a
continuous 45 MHz span in the PCS band and the product shall meet specified
performance marks.
Each amplifier has a nominal gain of 56 dB and is phase matched at room temperatures.
The MCPA is designed to track amplitude and phase over all environmental conditions
such that the units may be used in a parallel configuration
Functional Blocks:
The Andrew MCPA is comprised of the following functional areas:
−
−
−
−
−
−
−
−
Preamplifier with unit gain and phase control
Feed-Forward amplifier circuit
Main amplifier stage
Pre-distortion circuit
FICA (Filter, Isolator, Combiner Assembly)
Power conversion circuit
Controller circuit
Communications circuit
Inputs and Outputs:
The amplifier is powered from a DC supply voltage, which can range from 21V to 30V.
The DC power is brought into the amplifier through a D-Sub connector located on the
rear side of the amplifier. The D-Sub connector also contains an RS-485
communications bus.
A second D-Sub connector located on the amplifier front panel is used for RS-232
communication. This connector is only used during factory tests and field maintenance
procedures.
Alarms and operating state are communicated to the outside world through the RS-485
communications bus, the RS-232 communications bus, and visible LEDs located on the
amplifier front panel.
The RF signal is brought into the amplifier through a female PkZ type connector located
on the rear of the amplifier. The amplifier RF signal is brought out of the amplifier
through a N type connector located on the rear of the amplifier.
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RF Power Amplifiers
Control System:
A microprocessor controller is used to control the amplifier alarm system, control
environmental compensation of the amplifier, and to maintain a linearization solution for
the pre-distortion circuit and the feed-forward circuit.
Alarm
LED
Fan Tray
Asdsembly
Warning
LED
Captive Screw
Mounting
Active
LED
Handles
Tx Enable
Disable Switch
RS232 Debug
Port
Fan Tray
Interface
Figure 1 MSA1900-135 MCPA Front Panel
DC/Control/RF input
Connector
24W7 Combo D-Sub
RF Output
Connector
Type N
Figure 2 MSA1900-135 Rear Panel
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RF Power Amplifiers
Alarm
LED
Fan Tray
Assembly
Warning
LED
Captive Screw
Mounting
Active
LED
Handles
Tx Enable
Disable Switch
RS232 Debug
Port
Fan Tray
Interface
Figure 3 MSA850-135 MCPA Front Panel
DC/Control/RF Input
Connector
24W7 Combo D-Sub
RF Output
Connector
Type N
Figure 4 MSA850-135 Rear Panel
The following table is a summary of detailed alarms within the PA Module. The alarms
are mapped to front panel LED behavior, as indicated. Additionally, the alarms are
mapped to the discrete line relays and available at the D-Sub connector at the rear of the
PA Module.
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RF Power Amplifiers
Condition
(Shading shows
grouping)
Initial Power On, no
alarms
Self Test fail
Normal Operation –
RF enabled
Normal Operation –
RF disabled
Fans (see note 1)
High temp,
Minor
High temp,
Critical (see note 2)
RF overdrive
Major (see note 3)
RF Overdrive
Critical (see note 4)
Linearizer (see note
5)
Device health and
Internal Voltages
Sensor fault (see
note 6)
Device current (see
note 7)
VSWR minor (see
note 8)
VSWR critical (see
note 9)
Low input voltage
(<26V)
Bias fault (factory
only) (see note 10)
Self-test fail (see
note 11)
Configuration fault
(EEPROM
checksum)
Alarm Type
(Minor Alarms are shown by
Green and Yellow at the same
time)
Green LED
Yellow LED
Normal
Major
Comments
Retry
On for ½ - 1½ secs
On
On
Red LED
Critical
On
Critical
On
On
Fast Flash
1 Hz complete cycle
Minor
Minor
On
On
On
On
No action
Auto-recover
Critical
On
Shut down
Major
On
Gain reduced, Auto-recover
Critical
On
Shut down
Critical
--
On
Shut down
Critical
On
Shut down
Critical
On
Shut down
Critical
On
Shut down
Minor
On
On
No action. 4 sec delay to turn on the LEDs
Critical
On
Shut down
Major
On
Gain reduced, Auto-recover
Critical
On
Shut down
Critical
On
Shut down
Critical
On
Shut down
Table 2 Alarm mapping for PA Module
Note 1: Fan failure is considered a minor alarm since there is no immediate impact on
unit operation, the seriousness depends on ambient temperature, and the high
temperature critical alarm will eventually protect the unit from damage.
Note 2: High temp: will retry when the temperature drops by a hysteresis amount, if
there is no fan alarm.
Note 3: Whenever the overdrive protection mechanism (see above) requires added
attenuation for a sustained period equal to the alarm hysteresis time, an overdrive major
alarm is declared. This condition indicates that firmware has reduced amplifier gain, but
the amplifier output is not being overdriven. This threshold is typically 0.5 dB above
rated output power.
Note 4: This alarm indicates that the input level is of a value which cannot be attenuated
enough by the input attenuator. Shut down must happen fairly quickly (20-100 mS
tentative) to avoid tripping the circuit breakers and to avoid RF device failure. This
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RF Power Amplifiers
threshold is typically 10.5 dB above rated input power (51.3 dBm output – 56 dB nominal
gain).
Note 5: Whenever a linearizer alarm occurs, the amplifier is shut down. Each actively
tuned gain and phase adjuster has a factory nominal setting with leash limits around it.
Whenever the tuning algorithm persistently requires an adjustment beyond the leash
limits, a linearizer alarm is declared.
Note 6: Some sensors allow fault detection because they give readings that are out of
range (e.g. temperature sensor).
Note 7: Under current or overcurrent depending on the hardware.
Note 8: Typically 10 dB to set the alarm, with 3 dB of hysteresis (alarm resets at -13 dB).
When operated with other amplifiers in parallel, each amplifier performs its own VSWR
diagnostics and shut down independently. The shutdown process is coordinated with
the RFIM and Switch Combiner Module, eliminating chain reaction scenarios.
Note 9: A VSWR critical alarm is declared when the reflected power is 80W or more and
indicates that the unit may be damaged if not shut down. Since the amplifier cannot
detect that this condition has cleared while shut down, an RF enable command, restart
command, or power cycle is required to clear this condition. Since there are circulators
on the amplifier, a delay of about 1 second is acceptable before shutting down.
Note 10: A bias fault is declared during the factory bias setting algorithm (see above) if
firmware is unable to set the bias correctly. This is typically a hard failure; however, the
bias setting command can be repeated.
Note 11: Self test: Whenever the amplifier is powered on or reset (whether from the front
panel or otherwise), firmware performs a self-test. Included in the test are processor
RAM, boot image checksum, NVM image checksum, temperature sensors, power
supplies, and pilot/receiver operation. If any one of these tests fails, a self-test failure
critical alarm is declared and the unit does not start up. There is no recovery short of a
reset or power cycle. This is typically a hard failure; however, self-test will be repeated
on the next restart command or power cycle.
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RF Power Amplifiers
Installation and Operation Set-Up
The MCPA is easy to operate and use, requiring no special cabling since the main
in/put/output and +27V DC @ 30A, power connections are all blind mated into a
backplane. The input signals are also distributed to the amplifiers via the sub rack wiring
from a front RF connector.
FCC Statements:
FCC ID S8L-100270MCPA & RE: FCC ID S8L-100254MCPA
This devise complies with Part 2, 15 & 24 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference and (2) this
device must accept any interference received, including interference that may cause
undesired operation.
Warning
Changes of modifications not expressly approved by the manufacturer could void the
user’s authority to operate the equipments.
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Mod Date                        : 2005:08:04 20:43:09Z
Producer                        : Acrobat Distiller 5.0 (Windows)
Author                          : dcraig
Metadata Date                   : 2005:08:04 20:43:09Z
Creator                         : dcraig
Title                           : Microsoft Word - MCPA_Users_Manual_1.1.doc

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